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I'm about to get a set of 18' wheels & new tires especially for autocross & tracking and have found that exact recommended sizes are not always available. As I understand it, there is some flexibility in matching tires & wheels (& cars), but not sure which way one should tend and what the trade-offs are.
I've had PMs with a couple of people about this, but rather than bugging them further, I thought I'd open it up here.
For example, I'm looking at BBS RS-GT 18x8.5 F & 18x9.5 R wheels, and Falken RT-615 tires. TR recommends 235/40 F and 265/40 R, and the Falkens do come in 235/40 for the fronts, but the closest for the rear are 255/40, 265/35 or 275/35. Will the 255,265 & 275 happily fit the 9.5' wheels? If so, is it better to go wide with smaller diameter, or keep the rears larger than the fronts? Indeed, should I look at 245s for the front seeing the CS has a marked tendency to understeer?
275 and even 285 will fit without an issue on to 9.5' wheels. I went with 10' wheels at the rear, because I intend to use 295/35 section tires, and 8.5' fronts and intend to use 255/35 tires. Very few companies have those sizes at this time even in the r-comp category. I am alright with the RT-615s because they are very cheap; however, next either will be Pirelli Corsa or Goodyear GS3-DS; unless Bridgestone releases the sizes I want for the RE-01s by early next season.
If you have not made your decisions about possible modifications to the chassis for track use; such as A/R bar(s), strut top mounts, bushings, springs, etc.; going with 245/40 and 273/35 615s would be alright for the short term, and you'll get your money's worth. My problem right now is that I don't know how exactly some of the modification I will do will effect handling characteristics, hence I am holding off on expensive tire choices at this time.
Thebenefit/issue (depending on your perspective) the 245/40 f and 275/35 r tires, the static weight distribution shifts to the front by about 2%, which is great for autocross but not so great for track IMHO.
Going over this issue, I think this is what I will do in the next few months:
<ul>[*]Get the 997 GT3rear A/R bar with solid adj. end-links (I might go for H&R rear bar, we'll see)[*]Get the 997 GT3 strut tops[*]Get some Exterme/Max Perf. tires (or they be semi-race) that are 255/35/18 front and 270/40/18 rear[*]Then, I'll evaluate if I need 997 GT3 control arms with solid bushings[/list]
I think this particular setup would be very effective. I also need to find a company that can make custom springs for me; if I can find that I'll be set for the next 1-2 years.
255 will fit 8' rim, but I am notsure how with stock rims, never tried it. I actually have 8.5' at the front and 10' rear and have close to 3/4' room to the strut, standard Fikse FM10, I cannot remember the offset right now.
Actually last weekend, looking at some test data from an auto-x I participated, it seems that 245/35 front and 270/40 rear will be a better combination for track using stock springs. If I have to go with 255/35 front, then 285/35 will be a better choice.
I am sure I'll be going back and forth about this until March 2007
i THOUGHT i sold them, but deal fell through. so i figured what the hell, just keep them. so i have profil 10 and also jongbloed. yet i still manage to run out of tires!
Mooty do you have PASM on your current car? I am running 8.5/9.5 fikse profil 13, went with the 9.5 because of pasm. I have a set of 245/285 hoosiers waiting to be mounted, have 1 more day on the pcups. Watkins ended up being a bust this weekend, only got 1 day in, it poured all weekend. I thought I would have had 2 more days on the tires but that didn't happen. Running in the rain is the worst.
PASM - Porsche Active Suspension Management
This active damping system offers continuous adjustment of individual damping forces based on current road conditions and driving style.
The driver can choose from two setup modes, ‘Normal’ and ‘Sport’, using a separate ‘damper’ button on the center console. ‘Normal’ mode is designed for general road driving and circuits with uneven tarmac. ‘Sport’ mode is intended for smoother track surfaces, where the harder settings help eliminate pitch and roll.
In either mode, PASM continuously evaluates the current conditions while automatically selecting the corresponding damper rates from the respective set of mapped values.
A range of sensors are used to monitor the movement of the body under acceleration, braking and cornering maneuvers, as well as on poor road surfaces. The PASM control unit then evaluates this data and modifies the damping force on each individual wheel in accordance with the selected mode. The result is a significant reduction in body movement as well as a better grip on the road.
For example: if ‘Sport’ mode is selected, the suspension is automatically set to a harder damper rating. If the quality of the track surface falls below a certain threshold, the system immediately changes to a softer rating within the ‘Sport’ setup range. When the quality of the tarmac improves once more, PASM automatically returns to the original, harder rating.
Need more information about PASM? Click this link: FAQ for PASM
Linear Mode
