beebone

hi,

I change a set of 993 Targa wheel with

F:225/45/17
R:245/40/17

968 CS trye spec, the handling is very responsive and comfortable. I love it!!!!!

But I feel one problem. Let me mention the old spec first

Old Wheel: 17" Work Bromacher wheel, 8.5" F, 11" F
Trye: F 235/45/17, R 275/40/17

The problem I can feel, the old wheel spec gave me more punchy feeling on boost, start boost up at 2500rpm, full bost at 3500 rpm. I can hit that figure on partial throttle. At off throttle, the car seems jerk alot.

But now, the off throttle jerk reduced, the car run very smooth. The boost response seems slow, I have to hit the throttle more than before. No idea why?!?!?!?! Anybody?

Dougs951

Well your OD of the Rear tire is different.

Go here and check out the differences
Click me!

beebone

Yes, the circumference reduce from 24.85cm to 24.94cm, 0.43% larger on front (I checked that this is the cir. with orginal 951S wheel).
0.18% on rear then 275/40/17. It can explain the car smoother comparing with with wider tires.
But y more throttle is needed then before!!!!

CurtP

You've added rotational mass and increased unsprung weight.