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How much PSI in rear tires for 1/4mile?

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Old 04-27-2005, 09:49 PM
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AMG 55, 335i, Mini Cooper S
How much PSI in rear tires for 1/4mile?

I will be taking my car to the track on Friday night, and I was wondering what psi I should set the rears and the fronts? Maybe I can break into the 12's by removing the spare tire, 120lb bass box and only having a 1/4 tank for race fuel, my best is a 13.1. I was also considering removing the K&N filters and just running my AMG intake box empty, any thoughts?
Thanks in advance
Mario

Last edited by E55Cent; 04-27-2005 at 09:54 PM.
Old 04-27-2005, 10:04 PM
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2005 E55
I run with 22 psi. Taking weight out certainly helps, but I found that my 60 foot times began to suffer when I was really low on fuel.

At my recent track rental, my 60 foot times got a little better after I put $10 worth of gas in the car. I think it might be possible to be too light in the back. Strange.
Old 04-27-2005, 10:55 PM
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Mario...

Do you have your stock AMG wheels? You might consider fitting your stock wheels and maybe even fitting them with drag radials, but the taller sidewalls on the 18s will give you better launch traction.

I tried a few runs in the 20-25 psi range, and found pretty consistent numbers.
Old 04-28-2005, 08:50 AM
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It's all going to depend on what size tires you have. Pull the bass box and the spare tire out. Every 100lbs is worth almost a tenth. Let us know what size tires and we can go from there.

Derrick
Old 04-28-2005, 12:18 PM
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AMG 55, 335i, Mini Cooper S
Originally Posted by DJe55
It's all going to depend on what size tires you have. Pull the bass box and the spare tire out. Every 100lbs is worth almost a tenth. Let us know what size tires and we can go from there.

Derrick
The only wheels I have are my 19's 275/30/19 in the rears. I was also wondering what is the distance of a tenth of a second? Example: if two cars are racing side by side and one gets a 14.0 and one gets a 13.9, what is the distance between them? I was guessing 1/2 a car length.
Thank you for your help
Mario

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