patrickb

Center Muffle is a resonator absorber, it shouldn't play any role with the Sport Button which work at the flap level on the upper section of the exhaust system cats + side mufflers. pb

To my knowledge 700 were planned, yet, latest info i got 1900. (RS version) let's see. pb

Hi Paul, finally i contacted CCwheel.com, i was told they got 18" wheels can clear OEM PCCB (C10 model) , and 18" are the max size for full Slick Tires. They recommend full slick Hoosier R100's series 18" x 320 19 x 250 for rim 18" x 12" R, 18 x 9" F Still checking if that work. I have abandonned my quest for 19" full slick... Patrick

Thanks Paul, will do. I live in Shanghai, and my car is serviced on....F1 track there, so car is mostly used on that fantastic track, so i can swap wheel tyres anytime conveniently. I see there GT3 cup asia here service on 18" wheel/tyres with Michelin but none using PCCB. Your previous note anyhow gave me hopes. In contact with Champion/rim and TRG for tyres.... For the story, on F1 track shanghai (5.5 km). the laptimes are F1 cars : 1'35" best GP2 cars ; 1.45" best Formula Renault:2'06" best (which I drive too, at 2.09) Porsche Carrera Cup / 460hp(with Slick); 2'12" My GT3 RS on MPSC: 2.29 " All Ferrari 430 on MPSC :> 2.30" Looking at the difference from my GT3 RS with Carrera Cup, i am sure with the slick and light wheels, can improve by more than 10s , the rest being power, suspension, aero, weight. will tell you later. patrick

Thanks Paul. yet can a 18" wheel be fitted with on 997 GT3 RS with PCCB ? It seems OK in the rear, but in the front, apprently seem too crowded. What wheels & full slick size would you recommend, as i will have a specific set for the track original Front Stock come with 19 x 8.5 with 235/30 tyres..... Rear Stock 19 x 12 with 305/30 tyres... thx There are quite a few race wheel manufacturers who build 18" Porsche size wheels to clear the big brake kits. Check out CCWheels.com, they are some of the best and have good prices and excellent customer service. Their CCW C14 or C12, or C10 in an 18" x 9" wheel with a 53 offset will easily clear your 997 PCCB brakes. I believe Champion and HRT also have 18's that clear the PCCBs, as does BBS and Chargraphic's GT series. Check out CCW's new LM series of 3 piece wheels. You can get an width up to 16" with 16" 17" and 18" diameters only. They can build them to any offset that you desire. For a GT3, a brand new set of these go for $2,800.00 with the 12" x 18" weighing in somewhere between 20 to 21 lbs. The front 9" is probably around 18 lbs! I cannot say enough good things about CCW. I personally run their 18" x 9" with a 53 offset and 997 PCCB's - no problems! Stephen Thanks Stephen, you are lifting some of the mystery. Considering that i will build a specific set wheel + tyres, for TRACK PURPOSE ONLY then I am thinking: 18 x 9" Rim (CCW or Champion) with 265ZR35/ (Front) 18 x 12 Rim with 315ZR30 (Rear) or 325/30 with the lightest wheels types, maybe Champion RS28 or RG5-B or even Dymag Carco, and tyres either full Slick or Hoosier A6 What tyres types are you using for the track ? patrick

Thanks Paul. yet can a 18" wheel be fitted with on 997 GT3 RS with PCCB ? It seems OK in the rear, but in the front, apprently seem too crowded. What wheels & full slick size would you recommend, as i will have a specific set for the track original Front Stock come with 19 x 8.5 with 235/30 tyres..... Rear Stock 19 x 12 with 305/30 tyres... thx

I guess they have, because Porsche run Carrera Cup and GT3, but would they admit that officially, likely not because admitting it has far more implications on Porsche reliability on public market. Yet all the posts on 993/996TT seem to point to a solution yielding 5hp less....but it is worth when warranty will expire. You can recover easily the loss of hp by putting simply light wheels. stock wheels front/rear are 12/14.4 kg, aftermarket ones are 8.8/9.9kg, it by far offset the 5hp ciao pb

Well, Adam, if your car is still under warranty, it won't hurt changing the seal. Also according to some specialists poin1 and 3 might be closely related, as you solve one, you solve both. Anyway, each time you use the car (engine running oil temp at operating temperature), take the time to run the electronically monitored oil level, so you can get an idea, that leak is consuming. To me last time, it was somthing like 0.5L for 3000Km.... patrick Check also the below link on the most recent findings on RMS.... http://forums.rennlist.com/rennforums/997-...rt-here-13.html

Well, Adam, if your car is still under warranty, it won't hurt changing the seal. Also according to some specialists poin1 and 3 might be closely related, as you solve one, you solve both. Anyway, each time you use the car (engine running oil temp at operating temperature), take the time to run the electronically monitored oil level, so you can get an idea, that leak is consuming. To me last time, it was somthing like 0.5L for 3000Km.... patrick

For a GT3 engine, a RMS leak is all but normal, although common. What would it cost Porsche to admit it and re-design the seal to make lit leak-free ? Financially not much, only recalling 5000 cars, and change seal including manpower wouldn't exceed 1000 USD per car. So 5 M$ operation is not much for the most profitable Car Company in the world, which made several B$ profit in 2008, on VW shares...! So why ? Likely, Porsche has built up its image and branding continuously on Performances & Solid Design & Reliability (unlike Ferrari), so admitting a design error could have a far more disastrous effect.....pushing potential buyers to move to the less reliable Ferraris or Aston .... How to quantity that, hard to say ? This is why, Porsche is not able to decide the best course of action between making happier the few thousands GT3 owners and keep their N.1 image on reliability. Future might tell... Why the more powerful TT and GT2 don't have those troubles... Patrick

Hi Adam, 2 is normal 1 + 3 cannot be qualified as normal, yet they are common and my GT3RS 2007/9000Km has experienced all that. For the RMS seal, i replaced it 2 times under warranty, although it start leaking again 200km after replacement, no big deal, but can not be defined as normal. Still arguing with Porsche Patrick

Well, Paul, i did that already but no 19" shows up, except the Hoovier semi-slick , not much different from Michelin Pilot Sport Cup. Just wonder why only18" full slick available, std and widely available for Carrera Cup, but not even 19" seem do exist, while 997 GT3, GT3, TT, GT2 are all on 19" wheels..... Economic crisis oblige... I keep searching. Patrick

Anyone knows where to find 19" full slick tyres for track use ? Been looking for a while, seems only up to 18" available as far as my investigation concluded Patrick