10-22-2020, 11:02 AM | #15 |
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I like calling it stock and then oh it has catback and drag radials - just like stock.
Stomp n go !
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10-22-2020, 11:15 AM | #16 |
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Considering that this car, being an LT1 model, came with 245 all-season tires, I find this theory highly unlikely. Agree though that his chosen size might not necessarily be optimal due to throwing off the shifts (auto with a locked tcm). My own car SS/A8 going from the stock 275/35-20 runflats to a 305/45-17 MT (taller) saw a pretty modest improvement. Stock=1.83 short and 12.06@114, MT=1.76 short and 11.97@113. Once I bought HPT and was able to log, I found that the tall tires were screwing up the shift points. When they figured out how to unlock the t87a tcm so we can tune it, I was then able to fix things.
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10-22-2020, 11:19 AM | #17 |
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I'm thinking about putting a stock ported LT2 manifold on my ride and possibly a procharger after that. I'd use LT4 injectors and pumps so I can keep it all stock.
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10-22-2020, 01:54 PM | #18 | |
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i was simply stating that i think the tall tire is slower than a short tire. if one is going to buy drag wheels, capitalize with the shortest and lightest tire you can get away with. n2o or power adder cars, sure. use a big tire. stock na car? no.
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10-22-2020, 01:57 PM | #19 |
Drives: 2020 LT1, 04 JDM STI, 18 BMW Join Date: Mar 2020
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10-22-2020, 01:59 PM | #20 | |
Drives: 2020 LT1, 04 JDM STI, 18 BMW Join Date: Mar 2020
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10-22-2020, 04:47 PM | #21 | |
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10-22-2020, 06:48 PM | #22 |
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op: i get the 245 all season conundrum. id have done the same thing if it were available.
wnta1ss: all of the info was not available at the beginning. i've seen a lot of guys put 28" tires on their otherwise stock cars and barely go faster (your example). i was simply stating that a shorter tire is better for this particular setup. also, did you weigh the wheel/tire combo? hard to believe replacing a stock 20" wheel with a 17" drag wheel is only to drop 10 lb per side. maybe i'm using my wheels as comparison and they are heavier.
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2016+ camaro: everyone’s first car
Last edited by s346k; 10-22-2020 at 07:13 PM. |
10-23-2020, 06:28 AM | #23 | |
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10-23-2020, 07:44 PM | #24 | |
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10-24-2020, 07:36 AM | #25 | |
Drives: 2017 Camaro 1SS Join Date: Aug 2016
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10-24-2020, 08:05 AM | #26 | |
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10-24-2020, 08:38 AM | #27 |
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Taller tires reduces shift extension meaning you will fall back to a lower rpm on shift. You will go faster on a shorter tire if you can hook. I believe the top bolt-on A8 cars run a 26" tire for better gearing at the track, then move to a 28" with more power like H/C because the 26" will no longer hook. I ran a 305/35/20 555r even when bolt-on NA and it was 5-6 tenths quicker over the stock run flats but lost a little trap speed. Hard street tires put more power to the ground over drag radials. On a dyno you will see 15whp difference. So if all you care about is mph or roll racing then run a shorter harder street tire. If you want to hook then taller softer compound with a side wall that will flex is what you want. Sticking with something like a 275/35/20 555r2 is probably a good middle ground.
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10-24-2020, 09:14 AM | #28 | |
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