Spec_Ops2087

Your using street tires, they are designed to work at the recommended PSI as set by the vehicle manufacturer (aka 32psi all around cold).

Don't be the ricer that drops his street tires pressure down to 20psi and possibly cause a blow out at 100mph...

MadeInTaiwan

Dropping tire pressure is for rock crawling, not 1/4 runs

nakdboardr

Mr. Francesco

You guys too scientific about things sometimes. Hes driving virtually a stock s2000. Using race tires or slicks would damage his car more than anything. The chances of the tires blowing is very unlikely. Look at the majority of people that daily drive their cars on crappy roads under low tire pressure due to ignorance. Ive seen some people run around on the streets with 12psi. If anything he would want the tire pressure a little low to cause the initial slip. Having the tires at 32psi the whole time would basically make the car spin more.

s2000june

yeah you gotta launch way higher than that.. s2000 are sooo slow off the line.. no torque i hate it

Spec_Ops2087

Very unlikely sure, but I rather give safe advice then have the .001% chance of having his tires blow out then having a million dollar lawsuit against me


Thats the common misconception though, lowering STREET tire pressure will reduce grip not gain grip (the sidewalls are stiff on street tires). They are deisgned to work at a specific pressure; they are not like slicks / drag radials that should be around 20-25psi when being launched on.

ronnycage

i lowered it to 27 psi in the rear. Im using yokohama w4's Im gonna be buying some a048's soon im sure... once i get a tougher differential.

s2000isu

So when I lowered my tire pressure and it reduced wheel hop and helped my 60 foot alot that was being a ricer? I think this is the first time I have ever heard anyone say lowering your tire pressure at the track is bad for dragging. Seems kinda like standard procedure.

wills2k106

Think of a tire like a basketball. The more air pressure you have in it the higher the ball will bounce, the same is true of wheel hop and tires. I think 1 psi is worth 10 lb/inch of spring rate, but don't quote me on that. Raising the pressures on a car with wheel hop will just exaggerate the problem.

If you have excessive wheel hop and have tried other things like adjusting the leave RPM, then tire pressure is a good place to adjust. Lowering the tire pressure in a street radial, not a drag radial, to much lower than 25 isn't going to help, but 25-27 should be okay. I have never done it for the S, but I have in other cars. Driving on the street with pressures that low isn't going to be very good for them. A few runs in a straight line aren't as bad as driving around on low tires with all the side loads.

Street tires I wouldn't recommend less than 27, but you should only go that low if the recommended pressures aren't cutting the mustard. Drag Radials, depending on the car, can be set as low as 15. Actual drag slicks can be 5.5 or lower, ours is between 5.5 and 8 depending on track conditions.

Spec_Ops2087

What did you lower it to exactly? 20psi? Yes you would be then because street tires are not designed to work at that pressure. 28-32 is well within spec.

Drag radials / slicks are designed to work at much lower pressures. They have way less stiff sidewalls that will deform to increase grip; street tires do not do this as the sidewalls are STIFF.