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BeckyD @ James Martin Chevy


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Old 12-09-2017, 11:21 PM   #1
cwebster
Cal
 
Drives: 2017 6th Gen Camaro ZL1 Coupe M6
Join Date: Sep 2013
Location: Newport, NC
Posts: 779
Back To The ZL1 Bone Stock Basics

(Dec 3 Track Day Details Below)

I'm finally starting to get more consistent ETs now that it's cooler and I've gone back to factory everything. I was hoping to break my bone stock record of 11.64 @ 122 last weekend (Dec 3) but forecast low temps jumped almost 10 degrees. After analyzing my videos and data (see below), I can see where I missed a few opportunities (see below). Hopefully, with low temps & humidity and high barometric pressure forecast for tomorrow I can get a new personal best and beat my old record without getting sideways. I'll be filling up with fuel before heading out - should arrive with over 3/4 tank. That should give me enough extra traction to compensate for the 45-55 degree temps.

All Summer long I've been trying various things to improve my ETs and 60 foot times. One by one these strategies failed. I've been mostly in low 12s and high 11s.

[Drag Radials]

First, of course, were the MT DRs. When I first ordered them I thought I'd see at least a few 10ths improvement right away. The softer "R" compound did let me hook well at launch and virtually eliminated tire spin on the shift to 2nd. Unfortunately, a dead-hook on the 2017 ZL1 M6 triggers the "Manual Transmission Protection" feature, aka torque management, even if you don't slip the clutch. It immediately pulls timing and the car takes a nose dive. After a few weeks of practice I learned to do minimal burnouts. The trick is to heat the tires just enough to allow minimal wheel spin on launch to get the car rolling, then hook when there's enough momentum to get into the power band (about 2500 RPM). The sticky rubber really helps keep the wheels planted with high-torque up-shifts. It was extremely difficult to get consistent 11s, though. Because of the launch issues I can seldom get better than 2.0 sec 60 ft times. Switching back and forth between the DRs and stock rubber on the same trip showed me I was getting about the same ETs and usually got better times with the stock rubber. The car handles completely different with the high-sidewall, under-inflated DR's - sometimes a bit scary in the wind. For the past 2 track days I've been strictly on stock tires - mainly because I can't get anyone to drive my truck to carry my DRs, fuel, tools, and air.

[Ethanol-free Gasoline]

I've written about this before so I won't go into great detail but the reasoning was that the E10 pump gas was being diluted with enthanol. Without higher compression and special metering most engines can't take advantage of the higher octane available in the alcohol. I was hoping that the ECM would adjust for the higher octane. After a few track visits it became apparent that it wasn't helping. In fact, I was probably getting less power. Apparently, the engine is happiest with E10 93 octane pump gas. If I'm going to change fuel formula dramatically I'll need an ECM tune.

[Torco Racing Fuel additive]

I even tried adding some Torco Racing Fuel additive to bump the octane up to 107. Nope! In fact, I started to experience engine misfire and hesitation on the high-end. I decided to go back to E10 Pump gas and it's been faster and more consistent. Haven't seen a repeat of the performance problems so the 107 octane probably resulted in too rich of a mixture. Apparently, the ECM won't adjust for higher octane fuel. I have to conclude from this that these LT4 engines are tuned specifically for the E10 93 octane fuel. Any significant deviation without a corresponding tune results in decreased performance. I'm sure I could get more power if I was willing to void the warranty with an ECM tune but I'm not ready to go there yet.

[Vary Fuel Load for traction]

Up to now I've been minimizing the fuel load to lighten the car and improve times. I'd arrive at the track with just about 1/4 tank and run it to near empty. Because of the multiple pickups in the tank, I've had no fuel starvation issues. Problem is that the rear end is often too light. Even on warm days I'd have trouble with tire spin on launch and at gear shifts. Even with the DRs I'd sometimes get wheel spin in 2nd and 3rd gear. As the weather gets cooler it's more of a problem. For the past few track days I've been increasing the fuel load and my times are getting better and more consistent. Last Sunday I arrived with 5/8 tank. Tomorrow I'll top off the tank before I go to arrive with over 3/4 tank.

[Dec 3 Track Visit]

Below is my analysis and videos from my last track visit on 3 Dec. Due to some health issues and lack of motivation from poor track performance, there are several Summer track visits I've yet to document. This next track day may be my last 'til Spring if temps don't come back up some. The track I usually go to won't open if temps drop below 45 F.

Car Setup:

Stock rubber
22 PSI rear
36 PSI front
93 octane E10 pump gas - 1st pass with 5/8 tank

[Summary]

This was the most consistent track visit I've had in a long time with majority of passes coming in at 11.8 ET. I missed 3rd gear once which ruined that pass. Many of these passes I short-shifted 2nd and sometimes 3rd. On some passes it was unavoidable due to tire spin at top-end. On others I missed an opportunity for a mid to low 11 pass.

I raced a Grand Cherokee in back-to-back passes. He won the 1st pass after I had a lot of wheel spin on launch and short-shifted 2nd and 3rd. Got him on the 2nd pass, though. He likes to brag a lot so it was nice to shut him up for a while.

My last 2 passes were against a 5th Gen (2012) ZL1 M6. This was the first time I'd had an opportunity to do that. The owner has only had it for 3 months and this was only his 2nd time at the drag strip so it wasn't really a fair comparison but it was still fun. I made a few suggestions to help him get faster. We were both stoked to have something comparable to race with. We agreed to take up where we left off next time - hopefully next week (17 Dec) since he has obligations tomorrow. I was thinking I'd swap cars with him for 1 or 2 passes. I'd like to see if the 5th Gen has the same annoying torque management/Manual Trans Prot feature. I know my 5th Gen SS 1LE did not.


Below are all the details for each pass, including links to videos and notes. I'd welcome constructive criticism and helpful comments.

If you just want to watch the videos in chronological order or skip around. They're all in this YouTube playlist. Under each video is a full description of the pass. 20171203 Coastal Plains Dragway - Fast and Cool!


Hope everyone else is having fun with their Camaros.

Let 'er rip!

--Cal


Time Slip Data:
(My 6th Gen ZL1 was #16)

Code:
2017 6th Gen Camaro ZL1                      Opposing Lane
Seq  Time      R/T    60 ft  ET      MPH     Opposing Car         R/T    60 ft  ET      MPH   
 198 15:06:08  0.1649 2.0110 11.8320 120.29  Black Pontiac        0.1129 1.6740 12.2879 91.87
 205 15:13:04  0.1380 2.0750 12.0499 119.07  Gray Subaru Hatch    0.5581 2.2321 14.5849 89.49
 281 16:26:30  0.0240 2.0550 11.8970 119.96  Wht Chevy Avalanche  0.5009 2.3939 14.6901 100.93
 289 16:32:08  0.0820 2.0929 11.8620 121.65  Red Mustang 5.0      0.4711 3.9358 14.5711 103.84
 330 17:12:28  0.0870 2.0087 12.4061 113.59  Little Gray Car      0.2910 2.1420 13.8011 101.76
 335 17:21:28 -0.0229 1.9488 11.8497 119.40  Grand Cherokee      -0.0052 1.6661 11.6282 114.77 foul
 341 17:26:28  0.0020 1.9900 11.7588 121.35  Grand Cherokee      -0.0690 1.9508 12.1090 100.89 foul
 347 17:33:31  0.0699 2.1102 12.0240 121.02  5th Gen ZL1          0.0990 1.9919 12.1579 116.31
 353 17:38:47  0.0030 2.0318 11.8239 121.02  5th Gen ZL1          0.0750 2.1809 12.2830 115.98
[Lessons Learned]

1. Line-lock burnout only on 1st hot-lap pass, then rolling burnout. Too much heat will prevent the minimal spin I need to get into the power band.
2. Ride brakes on the return road for hot-lap passes. Helps to retain tire heat. Need less of a burnout.
3. Break tires free on launch to spin slightly then hook @ 2500 RPM or more. Idle at 2500 RPM then WOT on 3rd yellow, releasing clutch at 3500 RPM. Adjust throttle to minimize wheel spin.
4. Wind out all gears to redline if possible. Only back off if getting excessive high-end wheel spin.
5. Leave visor down to keep bright sky from washing out GoPro videos. Buy graduated ND filter.


Time Slips 1-4

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Time Slips 5-8

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Time Slip 9

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=============================================

20171203 CPD Pass 01 of 09 6th Gen ZL1 vs Black Pontiac

20171203 Coastal Plains Dragway
Weather: Sunny, 64F, clear, wind N 9 mph, 65% humidity, barometer 30.12 in

Time Slip Data:
Code:
2017 6th Gen Camaro ZL1                      Opposing Lane
Seq Time      R/T   60 ft ET     MPH     Opposing Car         R/T   60 ft ET     MPH
 198 15:06:08  0.1649 2.0110 11.8320 120.29  Black Pontiac        0.1129 1.6740 12.2879 91.87
Notes:

Stock rubber
Left lane
9-sec Line Lock burnout
All nannies off
2500 idle RPM
Launch @ 3500 RPM
Dropped to 2500 RPM with slight spin at 2500-1500 RPM (5-19 MPH)
Hooked @ 1500 RPM, 15 MPH
Slight wheel spin @ 5000 RPM, 46 MPH
Shifted 2nd @ 6500 RPM, 59 MPH
3rd @ 6500 RPM, 86 MPH
4th @ 6600 RPM, 116 MPH
Crossed finish @ 5900 RPM, 127 MPH, 11.8 sec

PDR Video:



GoPro Video:



=============================================

=============================================

20171203 CPD Pass 02 of 09 6th Gen ZL1 vs Gray Subaru Hatch

20171203 Coastal Plains Dragway
Weather: Sunny, 64F, clear, wind N 9 mph, 65% humidity, barometer 30.12 in

Time Slip Data:
Code:
2017 6th Gen Camaro ZL1                      Opposing Lane
Seq Time      R/T   60 ft ET     MPH     Opposing Car         R/T   60 ft ET     MPH
 205 15:13:04  0.1380 2.0750 12.0499 119.07  Gray Subaru Hatch    0.5581 2.2321 14.5849 89.49
Notes:

Stock rubber
Right lane
8-sec Line Lock burnout
All nannies off
2000 idle RPM
Launch @ 3100 RPM
Bogged, dropping to 800 RPM with ZERO spin
Hooked @ 800 RPM, 9 MPH
Moderate, continuous wheel spin @ 4300-6200 RPM, 43-56 MPH
Short-shifted 2nd @ 6200 RPM, 56 MPH
3rd @ 6400 RPM, 85 MPH
4th @ 6500 RPM, 115 MPH
Crossed finish @ 5900 RPM, 125 MPH, 11.9 sec

PDR Video:



GoPro Video:



=============================================

## Cool Down between hot-laps

=============================================

20171203 CPD Pass 03 of 09 6th Gen ZL1 vs White Chevy Avalanche

20171203 Coastal Plains Dragway
Weather: Sunny, 63F, clear, wind N 8 mph, 67% humidity, barometer 30.13 in

Time Slip Data:
Code:
2017 6th Gen Camaro ZL1                      Opposing Lane
Seq Time      R/T   60 ft ET     MPH     Opposing Car         R/T   60 ft ET     MPH
 281 16:26:30  0.0240 2.0550 11.8970 119.96  Wht Chevy Avalanche  0.5009 2.3939 14.6901 100.93
Notes:

Stock rubber
Left lane
9-sec Line Lock burnout
All nannies off
2800 idle RPM
Launch @ 2800 RPM
Dropped to 1200 RPM with slight spin at 2500-1300 RPM (3-14 MPH)
Hooked (sort of) @ 1200 RPM, 14 MPH
Slight wheel spin @ 1200-5100 RPM, 14-48 MPH
Shifted 2nd @ 6500 RPM, 59 MPH
3rd @ 6500 RPM, 89 MPH
4th @ 6600 RPM, 117 MPH
Crossed finish @ 5900 RPM, 125 MPH, 12.0 sec

PDR Video:



GoPro Video:



=============================================

=============================================

20171203 CPD Pass 04 of 09 6th Gen ZL1 vs Red Mustang 5.0

20171203 Coastal Plains Dragway
Weather: Sunny, 63F, clear, wind N 8 mph, 67% humidity, barometer 30.13 in

Time Slip Data:
Code:
2017 6th Gen Camaro ZL1                      Opposing Lane
Seq Time      R/T   60 ft ET     MPH     Opposing Car         R/T   60 ft ET     MPH
 289 16:32:08  0.0820 2.0929 11.8620 121.65  Red Mustang 5.0      0.4711 3.9358 14.5711 103.84
Notes:

Stock rubber
Right lane
Rolling burnout, reverse to reallign groove
All nannies off
1600 idle RPM
Launch @ 3100 RPM
Dropped to 800 RPM with momentary wheel slip @ 2800, No spin 3100-800 RPM (1-9 MPH)
Hooked @ 800 RPM, 9 MPH
Slight contiuous wheel spin @ 3200-6200 RPM, 30-58 MPH
Shifted 2nd @ 6200 RPM, 58 MPH
3rd @ 6400 RPM, 85 MPH
4th @ 6500 RPM, 116 MPH
Crossed finish @ 6000 RPM, 128 MPH, 11.7 sec

PDR Video:



GoPro Video:



=============================================

## Cool Down between hot-laps

=============================================

20171203 CPD Pass 05 of 09 6th Gen ZL1 vs Little Gray Car

20171203 Coastal Plains Dragway
Weather: Sunny, 60F, clear, wind N 6 mph, 69% humidity, barometer 30.15 in

Time Slip Data:
Code:
2017 6th Gen Camaro ZL1                      Opposing Lane
Seq Time      R/T   60 ft ET     MPH     Opposing Car         R/T   60 ft ET     MPH
 330 17:12:28  0.0870 2.0087 12.4061 113.59  Little Gray Car      0.2910 2.1420 13.8011 101.76
Notes:

Stock rubber
Left lane
9-sec Line Lock burnout
All nannies off
1800 idle RPM
Launch @ 2500 RPM
Dropped to 2000 RPM with ZERO spin, with continuous spin 2400-3500 RPM (9-28 MPH)
Hooked @ 2800 RPM, 29 MPH
No wheel spin 2800-6000 RPM, 29-55 MPH
Short-shifted 2nd @ 6000 RPM, 55 MPH
Missed 3rd gear @ 6500 RPM, 85 MPH - SC kicked in
3rd @ 5000 RPM, 80 MPH
4th @ 6500 RPM, 114 MPH
Crossed finish @ 5700 RPM, 120 MPH, 12.5 sec

PDR Video:



GoPro Video:



=============================================

## Extended wait in staging lanes

=============================================

20171203 CPD Pass 06 of 09 6th Gen ZL1 vs Grand Cherokee Round #1

20171203 Coastal Plains Dragway
Weather: Sunny, 60F, clear, wind N 6 mph, 69% humidity, barometer 30.15 in

Time Slip Data:
Code:
2017 6th Gen Camaro ZL1                      Opposing Lane
Seq Time      R/T   60 ft ET     MPH     Opposing Car         R/T   60 ft ET     MPH
 335 17:21:28 -0.0229 1.9488 11.8497 119.40  Grand Cherokee      -0.0052 1.6661 11.6282 114.77 foul
Notes:

Stock rubber
Right lane
Rolling burnout, reverse to reallign groove
All nannies off
2400 idle RPM
Launch @ 3500 RPM
Dropped to 2400 RPM with slight spin at 2400-4200 RPM (4-41 MPH)
Full wheel spin at 4300 RPM - go half throttle
- this is where DRs would help
Re-engage full traction @ 3200 RPM, 32 MPH
No wheel spin @ 3200-6300 RPM, 43-59 MPH
Shifted 2nd @ 6500 RPM, 59 MPH
3rd @ 6400 RPM, 85 MPH
4th @ 6600 RPM, 117 MPH
Crossed finish @ 5800 RPM, 126 MPH, 11.8 sec

PDR Video:



GoPro Video:



=============================================

=============================================

20171203 CPD Pass 07 of 09 6th Gen ZL1 vs Grand Cherokee Round #2

20171203 Coastal Plains Dragway
Weather: Sunny, 60F, clear, wind N 6 mph, 69% humidity, barometer 30.15 in

Time Slip Data:
Code:
2017 6th Gen Camaro ZL1                      Opposing Lane
Seq Time      R/T   60 ft ET     MPH     Opposing Car         R/T   60 ft ET     MPH
 341 17:26:28  0.0020 1.9900 11.7588 121.35  Grand Cherokee      -0.0690 1.9508 12.1090 100.89 foul
Notes:

Stock rubber
Left lane
Rolling burnout, reverse to reallign groove
All nannies off
2500 idle RPM
Launch @ 3100 RPM
Dropped to 2500 RPM with slight spin at 2500-1500 RPM (5-19 MPH)
Hooked @ 1000 RPM, 11 MPH
Bogged - No wheel spin 1000-6500 RPM, 11-61 MPH
Shifted 2nd @ 6100 RPM, 61 MPH
3rd @ 6500 RPM, 86 MPH
4th @ 6500 RPM, 116 MPH
Crossed finish @ 5900 RPM, 126 MPH, 11.8 sec

PDR Video:



GoPro Video:



=============================================

=============================================

20171203 CPD Pass 08 of 09 6th Gen ZL1 vs 5th Gen ZL1 Round #1

20171203 Coastal Plains Dragway
Weather: Sunny, 60F, clear, wind N 6 mph, 69% humidity, barometer 30.15 in

Time Slip Data:
Code:
2017 6th Gen Camaro ZL1                      Opposing Lane
Seq Time      R/T   60 ft ET     MPH     Opposing Car         R/T   60 ft ET     MPH
 347 17:33:31  0.0699 2.1102 12.0240 121.02  5th Gen ZL1          0.0990 1.9919 12.1579 116.31
Notes:

Stock rubber
Left lane
Rolling burnout, reverse to reallign groove
All nannies off
2100 idle RPM
Launch @ 3000 RPM
Dropped to 700 RPM with slight spin at 3000-700 RPM (3-7 MPH)
Hooked @ 700 RPM, 7 MPH
Slight wheel spin @ 4700 RPM, 46 MPH
Short-shifted 2nd @ 6400 RPM, 58 MPH
3rd @ 6400 RPM, 84 MPH
4th @ 6500 RPM, 116 MPH
Crossed finish @ 5800 RPM, 125 MPH, 12.0 sec

PDR Video:



GoPro Video:



=============================================

=============================================

20171203 CPD Pass 09 of 09 6th Gen ZL1 vs 5th Gen ZL1 Round #2

20171203 Coastal Plains Dragway
Weather: Sunny, 60F, clear, wind N 6 mph, 69% humidity, barometer 30.15 in

Time Slip Data:
Code:
2017 6th Gen Camaro ZL1                      Opposing Lane
Seq Time      R/T   60 ft ET     MPH     Opposing Car         R/T   60 ft ET     MPH
 353 17:38:47  0.0030 2.0318 11.8239 121.02  5th Gen ZL1          0.0750 2.1809 12.2830 115.98
Notes:

Stock rubber
Left lane
Rolling burnout, reverse to reallign groove
All nannies off
2200 idle RPM
Launch @ 3800 RPM
Dropped to 2600 RPM with slight spin at 2600-3500 RPM (15-30 MPH) and 3300 (31 MPH)
Hooked @ 4300 RPM, 32 MPH
Shifted 2nd @ 6300 RPM, 60 MPH
3rd @ 6400 RPM, 84 MPH
4th @ 6600 RPM, 117 MPH
Crossed finish @ 5900 RPM, 126 MPH, 11.8 sec

PDR Video:



GoPro Video:



=============================================
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Old 12-10-2017, 08:07 PM   #2
big dave

 
Drives: 2017 ZL1
Join Date: Aug 2009
Location: Maryland
Posts: 1,052
Cal, man it's good to see you're back at it again. I hope all's well with your health now. As always, you've given us some of the most informative and insightful posts anyone could ask for. With all the practice and documenting you're doing, it's no doubt you'll start to see those times fall again. Now is the time of year the die hard racers have been waiting for with the cold temperatures and good da, we just have to hope the tracks are treated well enough to offset the cold surfaces.

One thing I noticed when comparing your time slips to the PDR video... the mph seems to be way low on your slips. Normally, depending on the track, my PDR mph is either dead on with track's timer, or maybe a couple mph low. Yours, on the other hand, is way off. Though the et's don't match up between the two, we know why. The mph just isn't making sense to me. Your PDR was showing 128 on 1 pass, yet the time slip showed 121. What gives? I'm sure you already have that figured out. lol. One thing's certain, you know how to handle a manual! No wonder you're the quickest manual on our list so far.

There was a big splash when David (17CamaroZL1) busted down the 10 second barrier with his stock ZL1. I too was able to get a new best before the tracks up this way closed for a few months...though I wasn't very close to the 10s. I'm not giving up though, spring can't get here soon enough.

I can't wait to hear how you next trip down the 1320 turns out...until then, I'll be tuned in
__________________
'17 ZL1 10.99@129 stock. 4225# raceweight. Best 60'- 1.66 on factory tires. 10.48@132 E50, intake and tune. 4270 lbs
https://youtu.be/EyHtdH9XOkY
https://youtu.be/Lcu41obbTf8
'13 ZL1 BRM A6. 11.591 @ 119.2 factory stock with a 1.68 60'! Best stock mph 121.8. 11.29 @ 123 RotoFab, drag radials and skinnies. 4360# raceweight.
http://youtu.be/yggIA3C_kkA 2014... back to stock
http://youtu.be/spQLaTWbThs 2013... stock & RotoFab

Last edited by big dave; 12-11-2017 at 11:07 AM.
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Old 12-10-2017, 10:41 PM   #3
Fraxum


 
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Drives: a M6 LT1 ordered From Becky!!!
Join Date: Jan 2010
Location: NJ
Posts: 7,520
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Nice to see you back. Great post! Your times are just a little better than my M6 SS full boltons with NT555R DRs a cross between a street tire and a drag radial. Our mph is about the same. My 60's are just a little better than yours dipping into the 1.8s.

Have you weighed your ZL1? My M6 2SS weighs around 3675 and my crank is around 500-510, yours is 650. Your car weighs around 200 pounds more than mine. Those numbers do not add up thinking about the weight difference. The ZL1 should be faster. I pick up 1-2 MPH more on the second 1/2 of the track where bogging and 60's make no difference. You 25, me 26-27. With a taller back tire my gearing is a little higher than yours.

The M6 SS seemingly has the off the line bog issue. But I think something is holding the ZL1 M6 back even more. I have been thinking of moving up to the ZL1. I hope this can get sorted out. Both our cars are over-geared for sure.

I do think a 4.10 gear would help us both big time. It might be coming but I do not know if the gear will fit us both. I will check if they build it.
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Old 12-10-2017, 10:51 PM   #4
17CamaroZL1
Life's Short, Live Fast!
 
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Drives: 2017 Hyper Blue A10 ZL1
Join Date: Nov 2016
Location: London, KY
Posts: 2,015
Awesome write up and documentation, as always, Cal!! Man, I hate to hear you've been having health issues. Very happy to see you're back up and running. I've always enjoyed reading your stories as you continue pioneering the way for the M6. I was shocked to read about how drag radials actually seem to hurt you more than help. GM needs to step up to the plate and help you manual guys out. It definitely sounds like there is a programming error on their part. I thought Travis had them on the verge of giving you guys a fix, but now I'm not sure if they're going to make it right or not.

As Dave said, I was finally fortunate enough to have everything fall into place for me to get through that elusive 10 second barrier, and he was very close himself. An 11.08 is getting it done. There will definitely be a second bone stock ZL1 in the 10s soon enough. Hopefully more.

I wish more modded guys than just Nick, that have ran 10s or better, would post up slips for the bolt on list. There are videos of 9 second ZL1s, but they're not on our list. That's a shame.

Well good luck. I will definitely be watching.
__________________
Life's Short, Live Fast! https://youtu.be/rTUv2p4T7OA 10.94 at 128 mph, 11.13 at 127mph 870 DA, https://youtu.be/e_X_LcpFp50 11.19 at 127mph 1100 DA, https://youtu.be/OXQiCQdQuH4 11.40 at 125mph 1800 DA
https://youtu.be/uWba1qs8M6Q 11.52 at 123mph 3500 DA
TZQPHG '17 ZL1 HBM|A10|Nav|PDR|CFW Hood|ZL1 Mats

12/26/2016 Ordered!
2/8/2017 Built!!
3/2/2017 Brought Home!!!
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Old 12-11-2017, 01:44 PM   #5
cwebster
Cal
 
Drives: 2017 6th Gen Camaro ZL1 Coupe M6
Join Date: Sep 2013
Location: Newport, NC
Posts: 779
Quote:
Originally Posted by big dave View Post
Cal, man it's good to see you're back at it again. I hope all's well with your health now. As always, you've given us some of the most informative and insightful posts anyone could ask for. With all the practice and documenting you're doing, it's no doubt you'll start to see those times fall again. Now is the time of year the die hard racers have been waiting for with the cold temperatures and good da, we just have to hope the tracks are treated well enough to offset the cold surfaces.
Thanks Dave. I do try to be thorough and it's always nice to know someone appreciates it. This track was prepped very well in both lanes. I alternated left and right to see if one was better, as I usually do. Although both were prepared equally well, the left lane always has a more narrow groove because big motor, wide-track drag racers tend to use the right lane and overrun the start line a lot for their burnouts. Our cars have a wide track so, in the left lane you have to either pick which half to line up on or straddle the narrow groove. For me, the left lane is often better if it's not too slick because it lets me spin just a little off the tree. On slick days the right lane is more consistently sticky.

Racing keeps the blood pumping through my veins, bro. I try to stay focussed on the positive. Docs are keeping an eye on my circulatory system and heart so I've had several imaging appointments. I've also been dealing with the VA on some issues related to my wartime service. I'm not gonna let all that get to me, though. At the track I can put everything else out of my mind and focus on going fast.

Quote:
Originally Posted by big dave View Post
One thing I noticed when comparing your time slips to the PDR video... the mph seems to be way low on your slips. Normally, depending on the track, my PDR mph is either dead on with track's timer, or maybe a couple mph low. Yours, on the other hand, is way off. Though the et's don't match up between the two, we know why. The mph just isn't making sense to me. Your PDR was showing 128 on 1 pass, yet the time slip showed 121. What gives? I'm sure you already have that figured out. lol. One thing's certain, you know how to handle a manual! No wonder you're the quickest manual on our list so far.
I noticed that too... I was thinking that their speed trap optical gate might be placed slightly off or there might be network latencies in the copper connections from weathering or wear. A speed trap will tend to give a lower speed than a direct measurement on the car, though. The speedometer is showing speed at a single point in time whereas the trap calculates speed as a function of distance over time. When the continuously accelerating car trips the first (speed trap) gate it's going slower than when it trips the 1/4 mile gate. Also, my estimate of speed at finish was based on trying to pause the video at the moment I passed over the last gate to read the PDR. I could have miscalculated this.

Nonetheless, I'm going to leave a note on their FB page messaging to ask about it. I'm on the stock tires here so I know my speedometer is within 1 or 2 MPH of actual, based on public road radar speed signs and traffic tickets (just a few). Even the DR's are about the same height, only about 7mm taller. That would put the speedometer slightly lower than actual.

Thanks for the compliment Dave - means a lot coming from such a seasoned racer as yourself.

Quote:
Originally Posted by big dave View Post
There was a big splash when David (17CamaroZL1) busted down the 10 second barrier with his stock ZL1. I too was able to get a new best before the tracks up this way closed for a few months...though I wasn't very close to the 10s. I'm not giving up though, spring can't get here soon enough.

I can't wait to hear how you next trip down the 1320 turns out...until then, I'll be tuned in
That's amazing! You and David are definitely pioneers of the A10 racers. I've said from the beginning these should be 10-sec cars - even the M6, were it not for the booby-trapped ECMs.

I should have at least 1 more track weekend before the season ends. Yesterday was a bust, though. Even though I pestered them ahead of time to be sure they'd be opening the gates, only 8 cars showed up so they cancelled and gave us our money back. They're scheduled for Street Legal Drag racing next Sunday and the weather looks very favorable so we'll see... I'm doing everything I can to get local racers and fans to show up.

--Cal

Last edited by cwebster; 12-11-2017 at 05:22 PM. Reason: Fix typo
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Old 12-11-2017, 02:14 PM   #6
cwebster
Cal
 
Drives: 2017 6th Gen Camaro ZL1 Coupe M6
Join Date: Sep 2013
Location: Newport, NC
Posts: 779
Quote:
Originally Posted by Fraxum View Post
Nice to see you back. Great post! Your times are just a little better than my M6 SS full boltons with NT555R DRs a cross between a street tire and a drag radial. Our mph is about the same. My 60's are just a little better than yours dipping into the 1.8s.
Thanks man! Yeah, if I can get those 60s down I'll be closer to where I should be for sure. There's a few bolt-on SSes down here that I have to work to get around. Sometimes they catch me on a bad launch too. That can be embarrassing - kinda feel like I failed to represent...

Quote:
Originally Posted by Fraxum View Post
Have you weighed your ZL1? My M6 2SS weighs around 3675 and my crank is around 500-510, yours is 650. Your car weighs around 200 pounds more than mine. Those numbers do not add up thinking about the weight difference. The ZL1 should be faster. I pick up 1-2 MPH more on the second 1/2 of the track where bogging and 60's make no difference. You 25, me 26-27. With a taller back tire my gearing is a little higher than yours.
Have not weighed it yet. Where would I go to get an accurate measurement? My estimates put mine around 3800-3900 lbs though, depending on fuel load. I'm always pulling hard on the big end too. It's where I usually catch the fast cars. I'm definitely going to question the track officials about their timing gates, connections, and maintenance.

Quote:
Originally Posted by Fraxum View Post
The M6 SS seemingly has the off the line bog issue. But I think something is holding the ZL1 M6 back even more. I have been thinking of moving up to the ZL1. I hope this can get sorted out. Both our cars are over-geared for sure.
I believe you're right on this point too. As Travis has pointed out in his very detailed analysys in "eLSD Wheel Slip % on M6", there is a high likelihood that there are errors in the eLSD wheel slip calculations. For me it seems the "traction managment" (aka Manual Transmission Protection "feature") is a major contributor to the now familiar nose-dive. I believe both are factors, as I outline in Post #151 of that thread. I can confirm without a doubt that the bulletin dcosta first posted here is keeping my 60 ft times close to 2 sec.

Quote:
Originally Posted by Fraxum View Post
I do think a 4.10 gear would help us both big time. It might be coming but I do not know if the gear will fit us both. I will check if they build it.
Since our diffs are quite different I doubt gears would be interchangeable but that would be nice - gives us more options. Maybe they'll offer gearing options for the ZL1 1LE that we can capitalize on too.

Thanks for the insights!

--Cal
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Old 12-11-2017, 02:39 PM   #7
cwebster
Cal
 
Drives: 2017 6th Gen Camaro ZL1 Coupe M6
Join Date: Sep 2013
Location: Newport, NC
Posts: 779
Quote:
Originally Posted by 17CamaroZL1 View Post
Awesome write up and documentation, as always, Cal!! Man, I hate to hear you've been having health issues. Very happy to see you're back up and running. I've always enjoyed reading your stories as you continue pioneering the way for the M6. I was shocked to read about how drag radials actually seem to hurt you more than help. GM needs to step up to the plate and help you manual guys out. It definitely sounds like there is a programming error on their part. I thought Travis had them on the verge of giving you guys a fix, but now I'm not sure if they're going to make it right or not.
Thank you David! Always glad to hear that someone appreciates the effort.

I try not to dwell on the health problems. I'd rather just deal with it and move on... I'll check the rear-view but I find that it's more productive to focus on what's ahead, so to speak.

Yeah, the DR let-down was a big disappointment for me. That's when it really hit home that someone at GM seriously sabotaged the launch capability. I understand that they want to minimize liability under the new street/track warranty but this goes way beyond reasonable IMO. If the lawyers have their way, they'll avoid a "fix". Still, with enough new Camaro owners raising their voice we could see back-door "enhancement" or "upgrade".

Quote:
Originally Posted by 17CamaroZL1 View Post
As Dave said, I was finally fortunate enough to have everything fall into place for me to get through that elusive 10 second barrier, and he was very close himself. An 11.08 is getting it done. There will definitely be a second bone stock ZL1 in the 10s soon enough. Hopefully more.
Dude! Way to represent man!

I have no doubt that Dave is hot on your heels too.

Quote:
Originally Posted by 17CamaroZL1 View Post
I wish more modded guys than just Nick, that have ran 10s or better, would post up slips for the bolt on list. There are videos of 9 second ZL1s, but they're not on our list. That's a shame.
I know, right? We gotta campaign for them to join and participate on the Camaro forums. The more the merrier...

Quote:
Originally Posted by 17CamaroZL1 View Post
Well good luck. I will definitely be watching.
Thanks. I'll be back...

--Cal
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