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12-17-2020, 11:07 PM
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#1 |
 Drives: 2017 ZL1 Join Date: Aug 2020
Location: Lakeside, Az
Posts: 491
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Tire SIZE for 1/2 mile-19 vs 20's?
My 315/30/20 Toyo r888r are used up and contemplating what to put back on, thinking the same tire in a 325/30/20, but...
I've got 325/19's gysc's on the rear of my track set for road racing and I see Toyo makes that size in the r888r and knowing the gysc's won't get enough heat in them for the 1/2 mile event to have traction I'm wondering what a slightly shorter tire (3/4") over the 325 in a 19" will do if I use the r888r in a 325/19 at the 1/2 mile. They have better accel at the roadcourse, but will it actually lose mph in the 1/2 mile vs the taller 20's? Anyone with any expereince along this line? |
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12-18-2020, 06:51 AM
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#2 |
Drives: 2022 Lt1 A10 Join Date: Nov 2015
Location: clark, mo
Posts: 8,860
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Its not gonna matter which one you choose. Make sure its the same height as stock.
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2022 Lt1 6.2 A10, Maggie 2300, THPSI Port Inj/10 rib, Rotofab, E, Nickey, SCOL, Griptech, RC Bandits, Hoosiers/MT 9.80@142.96 1.44 60ft, 6.34@112 707/669 RWHP/TRQ. 16SS Maggie 2650 9.41@147 1.35 60ft, 5.99@119. 16 C7 A8 10.90@128 Bolt on stuff
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12-18-2020, 10:54 AM
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#3 |
     
Drives: 2013 C6Z06 Join Date: Nov 2016
Location: PA
Posts: 1,577
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Auto or Manual? Use a gearing calculator with the tire size factored in. I would try to maximize trap rpm/speed in a gear vs an extra shift in the 1/2 mile.
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12-19-2020, 12:44 AM
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#4 |
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Drives: 2017 ZL1 Join Date: Aug 2020
Location: Lakeside, Az
Posts: 491
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It's an auto and I let it do its thing and I understand upshifts are based on mph vs rpm so I'm not sure how to make a selection based on that.
After doing some research I've seen this question asked on the corvette forum and the consensus seemed to be if traction is not a factor, the shorter tire for the 1/4 mile quicker et and the taller tire for 1/2 mile mph. That seems to make sense. Thanks! |
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12-22-2020, 10:25 AM
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#5 | |
 
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Quote:
I just recently purchased a ZL1 and plan to baseline my 1/2 mile speed in March 2021 before making any mods. But by then I will need tires and have been thinking about which tire would be best for the 1/2 mile. Sounds like from your post that the Toyo r888r hooks up pretty good? Do I need it for a stock car? Thanks.
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2018 ZLE - M6, Nightfall Gray
GM previously owned: 2014 SS M6 2014 ZL1 M6 2019 ZL1 M6 2016 Z06 M6 |
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12-22-2020, 10:34 AM
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#6 | |
    
Drives: '20 ZLE Join Date: Jun 2020
Location: Mile High
Posts: 3,560
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A larger wheel/tire will ultimately give a faster overall speed.
Quote:
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'20 ZL1 1LE A10,
OEM short block, LME heads/valve train, E2650. 100+ octanes, no eth, no meth, no N2O. 2/23 - 1031/1004 wheel. 4/23 - 1.41/9.61/145 at DA 7000 ft. (only made five passes). 2/24 - LME 390, E2650, FBO, 100 oct.; 1116hp/ 1063tq; 109 oct. dyno next. |
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12-23-2020, 07:47 AM
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#7 |
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Drives: Turbo 6.2 Join Date: Feb 2019
Location: Buffalo
Posts: 702
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Id stick with the stock height.
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2016 Turbo Camaro SS - 800hp/900tq 9.7@146
2018 LTZ Z71 Redline Silverado - 381hp/420tq 13.8@100 |
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02-14-2021, 09:47 PM
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#8 |
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Drives: 2017 ZL1 Join Date: Aug 2020
Location: Lakeside, Az
Posts: 491
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I think the slightly taller 325/30/20 toyo r888r is going to be my choice.
If not ever having done it before then I’d suggest go have fun with the stock tires, but my experience is even the toyo’s spin at the line. You’ll have to get a feel on feathering the throttle to get better mph. |
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