951 PCA - F Class wheel & Tires
08-08-2008, 12:50 AM
#16
Burning Brakes
Join Date: Jul 2001
Location: Orange Park Acres, CA
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Expect to do a little racing relatively soon.
Trying to decide on wheel diameter and tire size.
How many sets of wheels for drys?
(I was thinking two, one to heat cycle new tires)
What are the popular set ups? Why?
I have some turbo twists 17x8 & 17x9 that I expect to use for rains clad with 245x45x17 and 275x45x17 - Is this reasonable?
Trying to decide on wheel diameter and tire size.
How many sets of wheels for drys?
(I was thinking two, one to heat cycle new tires)
What are the popular set ups? Why?
I have some turbo twists 17x8 & 17x9 that I expect to use for rains clad with 245x45x17 and 275x45x17 - Is this reasonable?
08-08-2008, 08:41 AM
#17
Three Wheelin'
Thread Starter
That is food for thought. It's not as if wheel spin is a big issue with that little horsepower. I did order the 245's rain tires though, that made sense. I am currently running 245 45 17's and 275 40's. With the 275's I am going to have to roll the lips (probably with any race tire) as they scrub a little on a few higher force turns.
08-08-2008, 12:36 PM
#18
Rennlist Member
Are you running new F or old F? k26/6 car, or k26/8 car? Stock or progressed?
Makes a difference as to what widths you are allowed, which may limit your decision/choices. For a 951, Current E stock (8" frt, 9" rear), Current F stock (8" frt, 10" rear), Current F progressed (9" frt, 10" rear).
Depending on your home track and shift points, you may want to stay away from the 275/17s - the OD just increases the already excessively tall turbo final drive ( 3.375 R/P).
I raced an 87T in the old F stock (new E) for several years on 245s all around on 8 x 16s, and 8 & 9 x 16s. All four 8s are nice, as you can rotate all around for longer tire wear life. I never saw any performace advantage of running a 245 on the 9" rim, vs the 8". Because of the above concern w/ tire OD, I did not run 275/17s, and since limited to 9" max in the rear by rule, I could not run 285/18s (tires wont fit on a 9" rim).
Now running updated in stock G, I have 245s on 8 and 8.5 x 18s front, and 10 x 18 rear w/ 285s. I disagree with the couple of you that dont think a 285 in the rear is an advantage over a 245 - it is, even on a 217 hp car. Set the car up to handle more grip in back = more speed through the corners, on the power slightly sooner, and the larger tire/contact patch seems to handle the heat better (dont over heat and drop off pace as quickly as the 245s do).
Makes a difference as to what widths you are allowed, which may limit your decision/choices. For a 951, Current E stock (8" frt, 9" rear), Current F stock (8" frt, 10" rear), Current F progressed (9" frt, 10" rear).
Depending on your home track and shift points, you may want to stay away from the 275/17s - the OD just increases the already excessively tall turbo final drive ( 3.375 R/P).
I raced an 87T in the old F stock (new E) for several years on 245s all around on 8 x 16s, and 8 & 9 x 16s. All four 8s are nice, as you can rotate all around for longer tire wear life. I never saw any performace advantage of running a 245 on the 9" rim, vs the 8". Because of the above concern w/ tire OD, I did not run 275/17s, and since limited to 9" max in the rear by rule, I could not run 285/18s (tires wont fit on a 9" rim).
Now running updated in stock G, I have 245s on 8 and 8.5 x 18s front, and 10 x 18 rear w/ 285s. I disagree with the couple of you that dont think a 285 in the rear is an advantage over a 245 - it is, even on a 217 hp car. Set the car up to handle more grip in back = more speed through the corners, on the power slightly sooner, and the larger tire/contact patch seems to handle the heat better (dont over heat and drop off pace as quickly as the 245s do).
