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Discussion Starter · #1 ·
How do i prevent this from happening. I know stiffer sidewall tries help, but i cant just add sidewall to these tires. Would increasing tire pressure help without adding under steer. any other tricks?


 

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My pornstar name came up "Jay the Snork."
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I run 50 psi up front while autocrossing, or else end up driving on the fronts' sidewalls.( I have done the chalkmark on the sidewall/tread thing to find out the pressure necessary to prevent this). Decreasing the rear pressures will help reduce the understeer and get the car bring the back end around.
 

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Discussion Starter · #5 ·
rear sway bar does it's job just fine to help the car rotate, a little too much at time :)
It is my car, i was running 35 @ 60*F all around at the time. The tires max pressure is 40 or 42, i'll give those a try the next time I'm out there.

I'm looking into the upper strut bar and front sway bar. Thanks!
 

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Remember that the pressures listed on the sidewall are max cold inflation pressures. It specifies no upper limit for *at temp* temperatures.

My Falkens RT-215's sat around 42 psi when warm when I autocrossed, and jumped to ~50-52 psi when I hit the track. But sadly, that's what I needed to run to keep them from rolling over (and the RT-215's are the stiffest sidewalled street tire on the market). :eek:h:

Anyways, are you running the steelies? It looks to me like its just the hubcap that's exaggerating the look. I don't think you're even close to being in danger of de-beading.

FWIW, all the drift kids stretch the crap out of their tires (mainly for looks, but it also makes the tire respond insanely quick)...and few have issues debeading. i.e.



:icon_eek:
 

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FWIW, all the drift kids stretch the crap out of their tires (mainly for looks, but it also makes the tire respond insanely quick)...and few have issues debeading. i.e.

I'm sorry, I don't mean any offense, but all I can think whenever I see stretched tires like that is "Goddamn, that looks dumb as hell." Lower the car until it scrapes, fine; run 20" rims with tires so thin there's barely any room for air, okay; make your rims stick out of the fenders and mount tires narrower than the rims, no -- just no. It just looks like whoever did it didn't bother to measure the space they had to work with. I wish I could help it, but I'm hopelessly bigoted against stretched rubber and extended hubs.
 

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weird running into you here :p

stretch looks retarded when someone on stock suspension is running a 205-40-18 on an 18x7.5" . stretch looks great and is functional if you're dumped running wide wheels and need to keep the tread line at the fender.

to the op, yes, extreme stretch is not what you want, drifters use it to clear the fenders and allow for easier slip of the rears. i always thought that for autox you'd want a beefier
 

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i always thought that for autox you'd want a beefier
Yeah, usually. But the issue with autocrossing under SCCA rules is the SCCA limits your rim size in Stock classes. Beefier is better, but if you wedge a giant tire onto a tiny rim, you're sacrificing steering response/sharpness. Most national level autocrossers learn to overcome this handicap and continue to run huge tires on little rims (i.e. S2000 owners run 245/45/17's on 17x7's :cry: ) because grip is the ultimate decider in winning or losing. But ask any of them and they'd run a wider rim *if they were allowed to*.
 

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You could grab a spare set of stock rims and run undersized tires on them for track days -- something along the lines of 225/30 R15, if those exist. You'd get better acceleration and better cornering -- your speedometer would be way off, but all that matters in a race is whether you're going as fast as you can, anyway.
 
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