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Re: Tire Pressure for Better Handling Balance
Posted by David Prantl (more from David Prantl) on Sat, 16 Feb 2002 02:21:08
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

Your reasoning is correct.  If you pump up your tires more, you should get 
less rollover onto the sidewall, but also less ultimate grip.  Pump the back 
tires up more for less grip.  That said, I wouldn't want the back end of a 
9k coming around on the street, under ANY circumstances.

I think that your cornering performance could be dramatically improved if 
you switched to a higher performance tire (like at least an SP-Sport 5000) 
in a smaller aspect ratio, like  205/55/15.  I too messed around with 
various brands in the 205/60/15 size on my '86 9kT for quite some time, but 
nothing worked even half as well as switching to the 205/55/15 SP5000.

I don't know about your '86 9kT, but if all the suspension parts are still 
stock, you should be in dire need of new struts, a-arm bushings and ball 
joints in the front.  I know I am.

As for maximum safe tire pressure, I believe there's a number on the 
sidewall.  I run my 205/55/15 to about 36psi all around.

David Prantl
david_prantlno39sdcx6spamx782hotmail.com
'84 900S, 5M, 210kMi, RIP as of 2/98
'89 900, 3A, 116kMi, restored and SOLD on 3/24/01
'86 9000T, 5M, 193kMi
'88 9000S, 5M, 142kMi
'90 9000S, 4A, 138kMi
'93 9000CSET, 5M, 74kMi
'97 9000CSET, 5M, 60kMi
'68 97 Sonett V4, 4M, 76kMi, #000467

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