mdrums

Ok I sold off my CCW 18" wheels ( I will never know why I did this!) and then sold my 2007 Porsche Carrera S. I loved the forged CCW wheels...they were 18x9 fronts and 18x12 rears.



I have a 2009 Carrera S now and need some track wheels. I would get another set of CCW's in a heartbeat but am rethinking the size. My new 2009 Carrera S has the new SPORT PASM -20mm lower and stiffer suspension. This suspension is lower than the regular PASM. The car comes stock with 19x8 front and 19x11 rear with 235/35/19 and 295/30/19 tires.



I am wondering if Porsche tuned this suspension to work better with 19" wheels/tires than the 18" that most people use for the track?


Last question is... Tire Rack has a new low cost OZ wheel coming out in May. It is cast but is said to use a light casting technique so that the wheel is strong and light but costs less than forged. I could save $1000 with the cast OZ's instead of buying forged CCW's again.

or unless I can find a set of CCW's for the same price as the new OZ's I'd take the CCW's.

jrgordonsenior

The CCW classic's are $2,200. How can the OZ rims be $1,000. less?

http://www.ccwheel.com/files/wheelpr...php?id=Classic

mdrums

I was talking about CCW C10's or C14's...they are $2800. The OZ's are $1640.

Chaos

Check out the one piece new Forgelines

mdrums

I love Foregline but I always thought they were ultra expensive.Any idea on the price?

RonCT

I'm in the same spot trying to figure this out. Porsche, for the 2009 Sport PASM / LSD option appears to mandate 19" wheels and there's a write-up in Excellence somewhat related about the 18s vs. 19s and how each suspension is "tuned" to run a specific wheel type. For example, it says on the C2 that if you put 19s on the base suspension, you will regret it because the suspension isn't tuned to run those "big" 19s. One would have to assume that if the Sport PASM suspension is tuned and that 19s are mandatory on it, that there's some science behind it. I sold my 18" Fikses from the GT3 and am keeping my 19" Volks for now and not considering the 18" OZs or any other 18. I think I'll finish up the PSCups that are on the Volks and when those are used up, try the R888. After that, perhaps there will be more information out on the whole 18 vs 19 debate for the 2009 Sport PASM suspension.

mdrums

Ron, I wonder if it all boils down to the weight of the stock 19"'s the suspension is tuned to? Othe than that there is some difference in sidewall flex from 18 to 19's too.

I doubt we will ever know the true answer since none of us know any Porsche engineers to ask. Darn it!

RonCT

That's what it sounds like to me, but one would have to believe that a 40 lb front wheel and tire set in either 18 or 19" format should act the same. OEM is heavier, so... (and I'm making these up):

19" OEM might be 45 lbs tire and wheel combined.
19" Volks are about 40 lbs front combined.
18" AnyMaker wheels and tires might be about the same 40 lbs.

So, should there be any difference in how the suspension acts with equal or lighter wheels? Is Porsche assuming that an 18" combination will be heavier and the Sport PASM is "tuned" to run the lighter 19" combination?

Larry Herman

You might want to PM Bob Rouleau about this. He has experience with both 18s & 19s on the 996/997 platform. IMHO, unless you need 19s to clear the brakes, I would stick with the 18s for the track for cost and performance. There is such a thing as having too small a sidewall, and the 19s may be pushing it. Otherwise we'd all be running Dubs! (22s)

RonCT

Thanks Larry - we've all been running 18s on our 997 platforms, but this is the first time it appears Porsche is pushing toward 19s for a technical reason and not really saying why. The results that Excellence found with running 18s on the new Gen 2 PASM is telling. Unfortunately, there are very few people out there with lots of track time on the 2009 C2S with Sport PASM that have really compared 18 vs. 19. Would love to see one of the Porsche engineers chime in on this question

mdrums

Ron, see what Bob says. I have some calls into some Porsche school instructors that also do some Porsche testing and Michelin tire testing to see if they have heard of an answer to our question.

I'd say the 19" would be heavier than the 18"...BUT I am thinking while the 18" wheel is lighter the 18" tire is heavier than the 19" package so it might all wash out. Like Larry said it is the side wall of the 19" that concerns me...that the Sport PASM might react a certain way to the lower profile tires.

Probabl for DE it will really not matter but I'd love to know Porsche's true thoughts on this wheels size question.

TT Surgeon

OZ supraleggas (sp), 1800 a set to your door from TR, strong, light, cast...but OZs are known for strong castings.

IcemanG17

I would run CCW's and 18".....cheaper tires with a better selection of sizes........

tkerrmd

Mike, deja vu??

cmoss

The 19" wheels are bigger around, thus rolling further every revolution, and increasing the gas mileage--Yes? It seems so clear...