05-18-2020, 11:40 PM | #1 |
Drives: '15 Silverado LTZ & '13 ZL1 ragtop Join Date: Nov 2016
Location: Edmond, Oklahoma
Posts: 313
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Where am I losing my top end?
For two years now I can't top 120 mph in the quarter. My tuner and I have been working one the systems and tune. Throughout this time the heat exchanger has been a fundamental issue along with the intermittent failures of the methanol injection. The first trip to the track this year was a dismal failure. My heat exchanger expansion tank split a seam due to backpressure from a collapsed brick. I replaced the collapsed brick with a reinforced unit, had the expansion tank repaired and the IAT2s now do not exceed 130F. The methanol system seems to work great on the street under light to WOT pulls but the usage at the track is way off even though the IAT2s are good. Bottom line, something is retarding timing or applying torque control to limit my mph in the quarter to 118-120 while on a 40 roll I can pull into the 140s and still have more.
Help! What do we need to look at to fix the track tune? Even the 1/4 sims on the dyno say 11.2/125 mph.
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HP tune, Kooks 1 7/8" LT w/ cat deletes, FIC 1300 inj, E85, GPI SS3 blower cam, Fore Innovations Gen 5 dual pump module with twin TI Automotive 430 lph E85 compatible pumps, Lingenfelter 10 bolt 2.55" upper/9.17" lower pulleys, AFCO triple pass intercooler with dual fans, Killer Chiller interchiller, B3R insulated expansion tank, full BMR rear drag cradle and suspension, DSS one piece driveshaft and Stage 5 billet axle shafts, Rotofab CAI, reinforced brick, Devil's Own progressive methanol injection, FTI 9.5" billet lock up Street Racer torque converter, 3200 rpm stall, triple clutch.
Last edited by leemozoid; 05-21-2020 at 11:45 PM. |
05-19-2020, 12:03 AM | #2 |
Account Suspended
Drives: 2013 Sparkly Red One Join Date: Dec 2018
Location: Hospitality State
Posts: 2,558
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We have very similar builds. You should be in low 10s at the very least with the air in that area. I hate to say this but you might want to have another shop/tuner look at your build. A fresh set of eyes might see something that is currently being missed.
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05-19-2020, 01:34 AM | #3 |
Drives: '15 Silverado LTZ & '13 ZL1 ragtop Join Date: Nov 2016
Location: Edmond, Oklahoma
Posts: 313
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I'll never see 10s with my heavy assed convertible. I'll be happy with low 11s. My tuner and I have about the same hp. I'm about 1000 lbs heavier than his C7 so I figure I should be about one second slower than him. Currently he's running right at 10 flat. We just need to find what in the tune is holding me back on my mph. I know what I need to do on my part to improve my starts and 60' times.
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HP tune, Kooks 1 7/8" LT w/ cat deletes, FIC 1300 inj, E85, GPI SS3 blower cam, Fore Innovations Gen 5 dual pump module with twin TI Automotive 430 lph E85 compatible pumps, Lingenfelter 10 bolt 2.55" upper/9.17" lower pulleys, AFCO triple pass intercooler with dual fans, Killer Chiller interchiller, B3R insulated expansion tank, full BMR rear drag cradle and suspension, DSS one piece driveshaft and Stage 5 billet axle shafts, Rotofab CAI, reinforced brick, Devil's Own progressive methanol injection, FTI 9.5" billet lock up Street Racer torque converter, 3200 rpm stall, triple clutch.
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05-19-2020, 05:10 PM | #4 |
Drives: 2015 ZL1 Join Date: Jun 2015
Location: florida
Posts: 487
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Do you have any data logs?
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05-19-2020, 05:22 PM | #5 | |
Drives: ZL1, 2013, tri-coat-red, manual Join Date: Nov 2013
Location: Michigan
Posts: 1,607
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Quote:
No Doubt, I see 124 with Teds mail tune on the 125 package. |
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05-19-2020, 06:39 PM | #6 |
fo'shizZL1
Drives: 2017 ZL1 Join Date: Aug 2017
Location: ATL
Posts: 1,297
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Post up a tune and log. I'd be glad to take a look. With that much mph drop, it should be fairly easy to spot.
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2017 ZL1 M6 Black | Maggie 2650 // 103TB // Big Gulp // CSP LT's & Ultra Cats // Elite Ultra CC // BMR MM
Past Rides- 2014 ZL1 M6 Red Hot | Tons of mods 2004 CTS-V M6 Silver | Many mods 1995 Corvette M6 Torch Red | A few more mods 1992 Camaro M5 White | A few mods |
05-19-2020, 07:17 PM | #7 |
Drives: '15 Silverado LTZ & '13 ZL1 ragtop Join Date: Nov 2016
Location: Edmond, Oklahoma
Posts: 313
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No. We are going to do that the next trip to the track.
__________________
HP tune, Kooks 1 7/8" LT w/ cat deletes, FIC 1300 inj, E85, GPI SS3 blower cam, Fore Innovations Gen 5 dual pump module with twin TI Automotive 430 lph E85 compatible pumps, Lingenfelter 10 bolt 2.55" upper/9.17" lower pulleys, AFCO triple pass intercooler with dual fans, Killer Chiller interchiller, B3R insulated expansion tank, full BMR rear drag cradle and suspension, DSS one piece driveshaft and Stage 5 billet axle shafts, Rotofab CAI, reinforced brick, Devil's Own progressive methanol injection, FTI 9.5" billet lock up Street Racer torque converter, 3200 rpm stall, triple clutch.
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05-19-2020, 08:31 PM | #8 |
fo'shizZL1
Drives: 2017 ZL1 Join Date: Aug 2017
Location: ATL
Posts: 1,297
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Other data points to consider from MotorTrend, testing a stock 2014 convertible back in the day. It drops a little compared to the coupe, but 118-120 mph is almost stock for a 'vert:
At the dragstrip, the 4405-pound Camaro ZL1 convertible automatic hit 60 mph in 4.1 seconds and finished the quarter mile in 12.5 seconds at 114.3 mph. In comparison, the 354-pound-lighter ZL1 coupe with a six-speed manual sprinted to 60 mph in 3.8 seconds and finished the quarter mile in 12.1 seconds at 117.4 mph. With a 60-mph stopping distance of 106 feet, the ZL1 convertible stopped 2 feet shorter than the coupe. Thanks to GM's Magnetic Ride Control suspension, the ZL1 convertible posted 1.01 g around the skidpad and lapped the figure eight in 24.1 seconds at 0.85 g average, putting it right on top of the coupe's handling numbers (1.02 g and 23.9 seconds at 0.83 g).
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2017 ZL1 M6 Black | Maggie 2650 // 103TB // Big Gulp // CSP LT's & Ultra Cats // Elite Ultra CC // BMR MM
Past Rides- 2014 ZL1 M6 Red Hot | Tons of mods 2004 CTS-V M6 Silver | Many mods 1995 Corvette M6 Torch Red | A few more mods 1992 Camaro M5 White | A few mods |
05-19-2020, 10:19 PM | #9 |
Drives: Never just fly under the radar Join Date: Jul 2015
Location: Kansas
Posts: 1,531
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Not a ZL1 just NA, but having the same issue always trapping right at 118 mph no matter my times ranging on average from 11.4-11.9. My build should be capable of high 10's or low 11's at the least. Be interesting to see if you get it solved.
Rob if you would look at a couple of logs I'd be happy to post them?
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1-8-4-3-6-5-7-2
Old Skool |
05-23-2020, 12:59 AM | #10 | |
Drives: '15 Silverado LTZ & '13 ZL1 ragtop Join Date: Nov 2016
Location: Edmond, Oklahoma
Posts: 313
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Quote:
__________________
HP tune, Kooks 1 7/8" LT w/ cat deletes, FIC 1300 inj, E85, GPI SS3 blower cam, Fore Innovations Gen 5 dual pump module with twin TI Automotive 430 lph E85 compatible pumps, Lingenfelter 10 bolt 2.55" upper/9.17" lower pulleys, AFCO triple pass intercooler with dual fans, Killer Chiller interchiller, B3R insulated expansion tank, full BMR rear drag cradle and suspension, DSS one piece driveshaft and Stage 5 billet axle shafts, Rotofab CAI, reinforced brick, Devil's Own progressive methanol injection, FTI 9.5" billet lock up Street Racer torque converter, 3200 rpm stall, triple clutch.
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05-23-2020, 10:52 AM | #11 |
Drives: ZL1 Join Date: Dec 2016
Location: New Orleans
Posts: 261
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How much timing is in the car at your higher RPM range
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05-23-2020, 11:52 AM | #12 | ||
Drives: BLUE CAMARO ZL1 1LE M6 Join Date: Jun 2009
Location: ON THE DYNO WATERBURY CT.
Posts: 15,230
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Quote:
Stock 13 ZL-1 auto with simple JRE 125 RWHP on 93 octane, no meth, no brick, no tank, no heat exchanger, no converter, no cam, stock upper 18% lower 12 psi boost, 11.0 125 in 89 degree humid weather on drag radials. With all your mods you should be in the 9s 135+ Be glad to help you get it sorted out but expect to make changes to the combo and tuning. Ted
__________________
www.jannettyracing.com
Celebrating 37 years Performance parts, Installation, Fabrication, Dyno tuning, Remote custom tuning, and alignments. 203-753-7223 Waterbury CT. 06705 email tedj@jannettyracing.com |
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05-30-2020, 10:00 PM | #13 | ||
Drives: '15 Silverado LTZ & '13 ZL1 ragtop Join Date: Nov 2016
Location: Edmond, Oklahoma
Posts: 313
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Quote:
__________________
HP tune, Kooks 1 7/8" LT w/ cat deletes, FIC 1300 inj, E85, GPI SS3 blower cam, Fore Innovations Gen 5 dual pump module with twin TI Automotive 430 lph E85 compatible pumps, Lingenfelter 10 bolt 2.55" upper/9.17" lower pulleys, AFCO triple pass intercooler with dual fans, Killer Chiller interchiller, B3R insulated expansion tank, full BMR rear drag cradle and suspension, DSS one piece driveshaft and Stage 5 billet axle shafts, Rotofab CAI, reinforced brick, Devil's Own progressive methanol injection, FTI 9.5" billet lock up Street Racer torque converter, 3200 rpm stall, triple clutch.
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06-01-2020, 08:43 AM | #14 |
Drives: BLUE CAMARO ZL1 1LE M6 Join Date: Jun 2009
Location: ON THE DYNO WATERBURY CT.
Posts: 15,230
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Feel free to call to discuss. 203-753-7223
__________________
www.jannettyracing.com
Celebrating 37 years Performance parts, Installation, Fabrication, Dyno tuning, Remote custom tuning, and alignments. 203-753-7223 Waterbury CT. 06705 email tedj@jannettyracing.com |
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