Initial pressure for R888s

Sharif@Forged · 06-05-2010, 11:53 AM

Quote:

Originally Posted by cossie1600

The R888 are unlikely any tires I have driven. With the stiff sidewall, the car can run on 30psi without rolling over. Yet somehow the tire seems to work better with pressure between 38-44psi, the car just has more grip with the high pressure. It is odd to say this, but I recommend 38-42 cold pressure on the R888 (a tire which I hate). I think Toyo recommended the same thing.

Most people get the feeling that the side is actually a bit softer than some DOT race tires. I get that feeling when driving them. The lighter the car, the stiffer they will feel.

38-44psi is on the high side, but if your setup allows you turn faster lap times, then do it. The stopwatch doesn't lie. If I ran mine that high, I would be slipping all over the place.

cossie1600 · 06-05-2010, 10:20 PM

Quote:

Originally Posted by Sharif@Forged

Most people get the feeling that the side is actually a bit softer than some DOT race tires. I get that feeling when driving them. The lighter the car, the stiffer they will feel.

38-44psi is on the high side, but if your setup allows you turn faster lap times, then do it. The stopwatch doesn't lie. If I ran mine that high, I would be slipping all over the place.

Compare to A6/R6/R1, of course it is softer. I was comparing it to the RA1 sorry.

As I said before, the car felt no different on low or high tire pressure, yet the times just came down with the higher pressure. I guess that's the reason why Toyo recommends it. I honestly didn't believe it at first as the tires look fine on the lower tire pressure, yet the lap timer didnt lie and gave me the consistent result (lower times on higher pressure).

Bluemeanie · 06-05-2010, 11:33 PM

Actually there was an article on the corvette forum regarding the 888's which I used on my '07 Z. They found that a higher pressure ( 38 and higher ) made the tires work better. They did on my Z, about 39 if I remember correctly. On a very hot day 100+ my times were going down when everyone else's were going up FWIW.

Stan

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06-05-2010, 11:33 PM	#3 (permalink)
Bluemeanie Base Member Join Date: Nov 2009 Location: same as it always was.. Posts: 81 Drives: '09 370Z Rep Power: 17	Actually there was an article on the corvette forum regarding the 888's which I used on my '07 Z. They found that a higher pressure ( 38 and higher ) made the tires work better. They did on my Z, about 39 if I remember correctly. On a very hot day 100+ my times were going down when everyone else's were going up FWIW. Stan