275/35R18 and 335/30R18 tires. Do they fit?
07-24-2005, 04:07 PM
#16
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Wheel hop is typical on the Boxster and 996. I don't know about the 997 but it probably does that, considering that car being a modified 996.
When I ran the 10mm lowered rear with the stock suspension, the car was aligned, but it didn't feel good at the track. Manthey Racing told me about a toe out condition on the rear end under heavy load, using a lowered rear on the stock suspension. I went with 0.35 toe in per side and it got fixed, but got 1800 miles and 2 track days out of a brand new set of MPSC. So I went back to stock rear height and 0.25 toe in.
On the stiffer suspension, I went lowered rear again, still at 0.25 toe in. The car feels on rails. I did 2 days at Lime Rock, and 3 days at Pocono Long/Pocono North on that setup. As long as the car feels ok, the lower center of gravity can't be bad.
When I ran the 10mm lowered rear with the stock suspension, the car was aligned, but it didn't feel good at the track. Manthey Racing told me about a toe out condition on the rear end under heavy load, using a lowered rear on the stock suspension. I went with 0.35 toe in per side and it got fixed, but got 1800 miles and 2 track days out of a brand new set of MPSC. So I went back to stock rear height and 0.25 toe in.
On the stiffer suspension, I went lowered rear again, still at 0.25 toe in. The car feels on rails. I did 2 days at Lime Rock, and 3 days at Pocono Long/Pocono North on that setup. As long as the car feels ok, the lower center of gravity can't be bad.
07-24-2005, 05:31 PM
#17
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Per Toyo Tires recommendations, these sizes fit on the stock wheels.
In fact my preferred combo on the MPSC is 265/295.
Regarding times to back it up, I haven't compared the RA1 with the stock sizes MPSC back to back on a given track day. However, my best time at Pocono North last year on MPSC was almost a second slower than my best lap 2 weeks ago on RA1. Probably the new suspension and the shorter ring and pinion gear are helping, but that fastest lap was under light rain.
Anyway, it would be helpful to this forum if you can support your placebo effect theory.
It sounds like you are doing your best correctly test your new tires, but IMO they are still excessivly wide for the stock wheels.
Cheers
07-24-2005, 10:55 PM
#19
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Originally Posted by Z06
NJ-GT,
I just checked the Bob woodman page....have you heard anything about the DOT R Goodyear RS tire?
the have some sizes for the GT3
I just checked the Bob woodman page....have you heard anything about the DOT R Goodyear RS tire?
the have some sizes for the GT3
The 245/40 and 305/30 look like a great option.
07-24-2005, 11:14 PM
#20
Three Wheelin'
John H...the GM engineer who races in the T1 series with the Z06 and always seems to win from what I have seen used the Goodyear Tire..not sure if it's the new RS DOT R tire.
