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Old 05-18-2022, 05:35 AM   #15
laynlo15
 
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Quote:
Originally Posted by wnta1ss View Post
With those IMO overly-tall 305/35s, you should easily be able to move the shifter over to manual in 5th gear if the locked trans is short-shifting into 6th currently. Based on what my car did in the A8 4th gear with the MT 305/45-17 at 6500 rpm, I could see the A10 5th gear making 129mph at 6500 rpm with that 28.1" tire. Your tire is even taller than that. Honestly, I think that even the 275/35-20 could have likely made the stripe if you held 5th gear manually, maybe ~123mph@6500, or a scosh more?
I agree and I should have been logging but was helping log for a guy with a Zl1 with 2650 maggie. I sent some logs back to his tuner and I was concentrating on running 12.00 average after my 2 time trials. Didn't log and missed winning the 1000 bucks from Nitto. Close but no Cigar. Hope to get out one more time before we go to the Camaro Fest so I'll figure it out then. But I think its staying in 5th but had forgotten all about pulling the shifter over and holding 5th. Thanks for the old memories of doing that in the past
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Old 05-18-2022, 08:11 AM   #16
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Quote:
Originally Posted by wnta1ss View Post
With those IMO overly-tall 305/35s, you should easily be able to move the shifter over to manual in 5th gear if the locked trans is short-shifting into 6th currently. Based on what my car did in the A8 4th gear with the MT 305/45-17 at 6500 rpm, I could see the A10 5th gear making 129mph at 6500 rpm with that 28.1" tire. Your tire is even taller than that. Honestly, I think that even the 275/35-20 could have likely made the stripe if you held 5th gear manually, maybe ~123mph@6500, or a scosh more?
with a 28.4 tire 1.52 5th gear ratio (10 speed ), 2.77 rear 6000 rpm = 120.45 mph. With a 28.0 tire 6300 rpm = 124 mph. The factory 245 40 20 is 27.7 inches tall and I believe the SS rear tire 275 35 20 is 27.8 inches tall.
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Old 05-18-2022, 08:19 AM   #17
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Originally Posted by laynlo15 View Post
I agree and I should have been logging but was helping log for a guy with a Zl1 with 2650 maggie. I sent some logs back to his tuner and I was concentrating on running 12.00 average after my 2 time trials. Didn't log and missed winning the 1000 bucks from Nitto. Close but no Cigar. Hope to get out one more time before we go to the Camaro Fest so I'll figure it out then. But I think its staying in 5th but had forgotten all about pulling the shifter over and holding 5th. Thanks for the old memories of doing that in the past
My car with the 28.1 tire definitely stayed in 5th gear (10 speed) thru the traps at 120.7 mph . In that gear at WOT the 10 speeds do not up shift early, but do shift at 63-6400 RPM so its getting close. I wish these car shifted @ 6500 each gear 1-5. The 1-2 shift is always early, 2-3 a little better etc etc. My C8 with the DCT is very close to 6500 each and every gear WOT.
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Old 05-18-2022, 08:26 AM   #18
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Right on the mark at 120 with my tires at 28.4. I wanted to run a 295-35 but they were on back order till June. King found some 305s on Amazon, I hesitated but finally ordered a set. The 295s were 28.11 and that would have been ideal. Nitto shows the 275s at 27.56 and that's shorter then my 245s I didn't want the rears shorter than the fronts. Looks like crap also. So this 305 is almost an inch taller then the 275s would have been. The 275s would have been better for the 1/8 mile but doubt it would have trapped as much at the 305s and may have indeed shifted to 6th being that short unless I flipped it over to manual shift and held it in 5th as want1ss. I remember guys doing that back when the A8 came out in the 16 SS, seemed to have worked.
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Old 05-18-2022, 08:26 AM   #19
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Originally Posted by laynlo15 View Post
I'm not benefiting from those tall tires thru the 1/8. Would have been better off with a 275-35-20 but they just look to short at 27.66, they are actually short then my 245-40s on the front. They taller tire may be helping down track and keeping it in 5th gear if it is. I'm thinking back now that it probably is still in 5th. I'll log next time out to make sure.
The 2.77 rear gear ratio drops to 2.70 with the tire diameter going from 27.7 to 28.4. Your right though on the 275 35 20 being 27.6 inches. A 305 30 20 is 27.2 and that should make a better gear ratio fora better pull from a dig, but you would have to run 5th gear in manual mode to holdout for a 6500 rpm shift.
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Old 05-18-2022, 09:05 AM   #20
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Originally Posted by laynlo15 View Post
Right on the mark at 120 with my tires at 28.4. I wanted to run a 295-35 but they were on back order till June. King found some 305s on Amazon, I hesitated but finally ordered a set. The 295s were 28.11 and that would have been ideal. Nitto shows the 275s at 27.56 and that's shorter then my 245s I didn't want the rears shorter than the fronts. Looks like crap also. So this 305 is almost an inch taller then the 275s would have been. The 275s would have been better for the 1/8 mile but doubt it would have trapped as much at the 305s and may have indeed shifted to 6th being that short unless I flipped it over to manual shift and held it in 5th as want1ss. I remember guys doing that back when the A8 came out in the 16 SS, seemed to have worked.
Agree on the crappy look of a shorter rear tire, but hard to see when your comparing .2 or .3 either way. Me, I do not think about trap speed, ET is my my main objective.
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Old 05-18-2022, 10:07 AM   #21
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Gotta think about both. I'll work on the 1/8 in the future with some other bolt on mods and more tuning. Like my C7, started out at 12.06@116 and ended up 10.90@128, all bolt on mods. My 16 Camaro started out 12.04@116 and end at 9.41@147 with Maggie 2650 and forged internals and lots of money spent. So got some time to think about my next moves.
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Old 05-18-2022, 07:48 PM   #22
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Old 05-18-2022, 08:35 PM   #23
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Sounds like the Zl1/E is about 100 lbs heavier but it does have the blower so that makes sense.
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Old 05-19-2022, 03:09 PM   #24
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One thing I cannot get a handle on Laynlo is both your early runs you did a slightly better 60 ft compared to my 1.79, your car traps roughly the same mph as mine, but do not know where to begin to come up with any reasons on the big ET difference 11.60 versus your two passes 11.78 and 11.79 and considering the cars are the same model LT1 and with the same A10 and rear end.
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Old 05-19-2022, 04:16 PM   #25
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Tuning. I know my tune, but you don't know yours. Timing at different RPMS during the run. I may have less timing down low and more timing up top. There are so many variables you just can't measure our cars as a comparison. Cars are not always equal when there built either. I'm not sure what to tell you but don't have a stroke trying to figure out why two cars that appear close to the same run different ets and mph.
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Old 05-19-2022, 07:12 PM   #26
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Quote:
Originally Posted by lt4camaro View Post
One thing I cannot get a handle on Laynlo is both your early runs you did a slightly better 60 ft compared to my 1.79, your car traps roughly the same mph as mine, but do not know where to begin to come up with any reasons on the big ET difference 11.60 versus your two passes 11.78 and 11.79 and considering the cars are the same model LT1 and with the same A10 and rear end.
your car 1/8 miled 3 mph faster. the harder the car gets out, the more difference you'll see at the big end.

although if you look at the slips, the cars aren't much more than .15 apart the entire run.
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Old 05-19-2022, 07:20 PM   #27
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your car 1/8 miled 3 mph faster. the harder the car gets out, the more difference you'll see at the big end.

although if you look at the slips, the cars aren't much more than .15 apart the entire run.
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Old 05-20-2022, 06:01 AM   #28
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Originally Posted by lt4camaro View Post
One thing I cannot get a handle on Laynlo is both your early runs you did a slightly better 60 ft compared to my 1.79, your car traps roughly the same mph as mine, but do not know where to begin to come up with any reasons on the big ET difference 11.60 versus your two passes 11.78 and 11.79 and considering the cars are the same model LT1 and with the same A10 and rear end.
One thing is that you reduced the weight of your car, while laynlo15 added some on the back of his with those tall tires. His SS-takeoff rear wheels with those Nittos are likely 64~66 lbs each (instead of 59 for stock LT1 that you've mentioned), while you are using 52 lb wheels/tires on the rear. 24~28 lbs less rotating weight on your car is a benefit for sure. Plus you removed the passenger seat, sway bar, underbrace, etc, which he did not.

Your car, as s346k noted, ran a higher mph at the 1/8, which helped give a better back-half. Your car covered the second half of the track quicker in other words. When combined with your car's quicker 1/8 mile ET, the end result was a quicker ET in the 1/4.
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