991 Turbo track car
07-20-2018, 01:51 AM
#76
Advanced
265 GT2 RS N2 spec rubber in the front on 9x20" wheels, no rubbing, knocked another second off my best time at VIR on an 88 degree day. Highly recommended!!
325 rears to match the circumference of the front tires. These are Mercedes M0 spec, but they fit very well on 11.5" x 20 wheels.
As per your suggestion, I just ordered a set of PSC2 for track days : 265-35-20 N2 and 325-30-20 MO, will put those on the stock wheels to start.
07-20-2018, 04:15 AM
#77
Will 265 and 325 work on stock wheels? Those wheels look nuts 
07-23-2018, 12:30 AM
#79
Wow! They look GREAT !!!!!!
I have ordered today Girodiscs 410/390 and Ferodo DS1.11 from Apex Performance, 265(N2)/325(M0), KW springs with height adjustment, KW camber plates, LiteBlox Porsche Battery (-20,2Kg)
As exhaust I am still debating between Kline (local provider to me) and Europipe, guess EP is still a better quality and nicer sound for my style (I dont want a LOUD car), I have a 996tt with straight pipes for that.
Kline can be converted to full cat-less system later on and giving less restriction and less weight, still my heart seems to be with EP for some reason.
Still debating for next stage of mods if going to use Turbo S Exclusive OEM wheels R20 with Hoosiers or try to fit some motorsport custom wheels on R19 with slicks or Hoosiers...
I did some laps on the local track on used Pirellis ans stock config, will report back my impovements, hoping for 2-3seconds/minute on Cup2s
I have ordered today Girodiscs 410/390 and Ferodo DS1.11 from Apex Performance, 265(N2)/325(M0), KW springs with height adjustment, KW camber plates, LiteBlox Porsche Battery (-20,2Kg)
As exhaust I am still debating between Kline (local provider to me) and Europipe, guess EP is still a better quality and nicer sound for my style (I dont want a LOUD car), I have a 996tt with straight pipes for that.
Kline can be converted to full cat-less system later on and giving less restriction and less weight, still my heart seems to be with EP for some reason.
Still debating for next stage of mods if going to use Turbo S Exclusive OEM wheels R20 with Hoosiers or try to fit some motorsport custom wheels on R19 with slicks or Hoosiers...
I did some laps on the local track on used Pirellis ans stock config, will report back my impovements, hoping for 2-3seconds/minute on Cup2s
anyone running OZ Racing wheels? They are flowform cast, somewhere in the 24-25 lbs range weight wise but dirt cheap. 2400 dollars or so for the set... any other ideas for a second set of wheels for track what wont break the bank?
07-23-2018, 12:58 AM
#80
the only thing I would debate for Kline vs other systems is the fact that you have order it in inconel. With the catless system you are looking closer to 30lbs weight savings from stock. And that's all the way in the back of the car!
anyone running OZ Racing wheels? They are flowform cast, somewhere in the 24-25 lbs range weight wise but dirt cheap. 2400 dollars or so for the set... any other ideas for a second set of wheels for track what wont break the bank?
anyone running OZ Racing wheels? They are flowform cast, somewhere in the 24-25 lbs range weight wise but dirt cheap. 2400 dollars or so for the set... any other ideas for a second set of wheels for track what wont break the bank?
07-23-2018, 06:45 AM
#81
Yes, the weight savings are some of the few reasons I still look at Kline and Akrapovic, as considering also the Akrapovic titanium slip-on exhaust (-7kg/15lbs) and do some catless pipes myself as they arent to hard to fabricate.
After Sam's answer regarding my OEM Exhaust limits, I am also considering fabricationg catless pipes and add those to OEM Muffler
Top of the line OZ Racing wheels are FORGED, they are called SUPERFORGIATA and they are like 1500$/wheel, very light and very strong
OZ Superleggera, Alleggerita and others aren't forged and they are 1800-2500 for the set, not recommended to use @track with slicks or racing rubber. I have used some on my old 996tt with cup2 (alleggerita), but others had cracks using slicks on 997tt with some mods (superleggera), for 3000$ the OEM Forged rims are hard to beat even they are a bit heavier than AM
After Sam's answer regarding my OEM Exhaust limits, I am also considering fabricationg catless pipes and add those to OEM Muffler
Top of the line OZ Racing wheels are FORGED, they are called SUPERFORGIATA and they are like 1500$/wheel, very light and very strong
OZ Superleggera, Alleggerita and others aren't forged and they are 1800-2500 for the set, not recommended to use @track with slicks or racing rubber. I have used some on my old 996tt with cup2 (alleggerita), but others had cracks using slicks on 997tt with some mods (superleggera), for 3000$ the OEM Forged rims are hard to beat even they are a bit heavier than AM
07-23-2018, 11:04 AM
#82
Advanced
Yes, the weight savings are some of the few reasons I still look at Kline and Akrapovic, as considering also the Akrapovic titanium slip-on exhaust (-7kg/15lbs) and do some catless pipes myself as they arent to hard to fabricate.
After Sam's answer regarding my OEM Exhaust limits, I am also considering fabricationg catless pipes and add those to OEM Muffler
Top of the line OZ Racing wheels are FORGED, they are called SUPERFORGIATA and they are like 1500$/wheel, very light and very strong
OZ Superleggera, Alleggerita and others aren't forged and they are 1800-2500 for the set, not recommended to use @track with slicks or racing rubber. I have used some on my old 996tt with cup2 (alleggerita), but others had cracks using slicks on 997tt with some mods (superleggera), for 3000$ the OEM Forged rims are hard to beat even they are a bit heavier than AM
After Sam's answer regarding my OEM Exhaust limits, I am also considering fabricationg catless pipes and add those to OEM Muffler
Top of the line OZ Racing wheels are FORGED, they are called SUPERFORGIATA and they are like 1500$/wheel, very light and very strong
OZ Superleggera, Alleggerita and others aren't forged and they are 1800-2500 for the set, not recommended to use @track with slicks or racing rubber. I have used some on my old 996tt with cup2 (alleggerita), but others had cracks using slicks on 997tt with some mods (superleggera), for 3000$ the OEM Forged rims are hard to beat even they are a bit heavier than AM
I also have the Forged OZ Racing Superforgiata wich are lighter and stronger than stock, total weight saving of 14lbs for the set, size and offsets are also similar to stock :
Front OZ Superforgiata : 20x9'' ET 51mm, 19.9lbs vs Stock 20x9'' ET 51mm, 22 lbs
Rear OZ 20x12 ET56mm, 23lbs vs Stock 20x11.5'' ET 56mm.
I also looked at the lighter but pricier HRE R101 LW or BBS F1R 133, but the 20x12 rears with 44mm offsets would get them to stick out too far if considering a wider tire than stock.
07-23-2018, 08:55 PM
#83
Burning Brakes
The Sharkwerks exhaust wich is 2 straight SS pipes, weighs 16lbs less than the OE muffler, adds some nice sound and cost much less than others at around $1900. It bolts to the stock cats, so unless you also change the cats, the power gain is not that much.
07-24-2018, 11:21 AM
#84
ECU works on load targets, thats why no more power up on top, we will see gains only in the middle range or more area under the curve.
If doing the exhaust I am considering picking between Europipe and Akra+catless pipes
If doing the exhaust I am considering picking between Europipe and Akra+catless pipes
07-24-2018, 11:28 AM
#85
Rennlist Member
Thread Starter
Actually, I think Sharkwerks claims no HP gain with just their exhaust, but it does sound much better and it does save weight. I have one and every time I think a Europipe or Kline would sound better, I remind myself that those cost much more than my Sharkwerks. I'd rather spend the savings on tires or ECU upgrades.
07-25-2018, 05:33 PM
#87
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Lifetime Rennlist
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Lifetime Rennlist
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Kline inconel is an excellent exhaust, and super light. The sound just keeps getting better, I have the full system on, including headers, I don’t get hung up on HP numbers, you need to measure response rather than peak HP. They work great.
As for the forgiatta, I have the 19” with GT2RS offset, that’s how offset should have been on this car, perfect fit.
As for the forgiatta, I have the 19” with GT2RS offset, that’s how offset should have been on this car, perfect fit.
07-31-2018, 11:01 AM
#89
Burning Brakes
Kline inconel is an excellent exhaust, and super light. The sound just keeps getting better, I have the full system on, including headers, I don’t get hung up on HP numbers, you need to measure response rather than peak HP. They work great.
As for the forgiatta, I have the 19” with GT2RS offset, that’s how offset should have been on this car, perfect fit.
As for the forgiatta, I have the 19” with GT2RS offset, that’s how offset should have been on this car, perfect fit.
I tested this exhaust configuration with the stock tune, and the gains were significant on acceleration and throttle response (lag almost missing). Of course the car went a lot faster with the Cobb tune. This exhaust configuration removed more than 40 lbs from my no-sunroof 991.1 Turbo S. With my 19" forged wheels and Li-Ion Porsche battery, my car got close to the weight of my 991 GT3 RS (within 100 lbs of my GT3 RS stock weight with same fuel load). It is the combination of lightweight and better flow.
07-31-2018, 11:08 AM
#90
Burning Brakes
Kline uses 2.5" tubing on their street muffler versions, and 3" on their race version (only available without cats). Without a tune, there are gains with headers, gains with sport cats, gains with no cats, and gains with mufflers.
I did a vBox test between my car with stock cats and Tubi muffler, and stock cats with stock muffler, there was a 0.2 secs difference on 0-100mph with the same tune (6.8 and 6.6 and 93oct ByDesign map), although not a big difference, a 3600 lbs car (driver included) needs around 25hp to gain 0.2 secs to 100mph.