I know it has been hard to get info on on OEM VTG Turbo spec from vendors, here they are

997.1TT
5304 988 0060 & 61:

· Max HP limit – 480 HP for the pair

· Max compressor flow – 31-32 lbs/min

· Actual CW dimensions – O.D. – 56.1mm / Inducer – 43.3mm

· TH area – 4.05ēcm

· S&W dimensions – O.D. – 48mm / Exducer – 44.5mm


997 GT2

5304 988 0080 & 81:

· Max HP limit – 530 HP for the pair

· Max compressor flow – 34 lbs/min

· Actual CW dimensions – O.D. – 56.1mm / Inducer – 45.1mm

· TH area – 4.26ēcm

· S&W dimensions – O.D. – 48mm / Exducer – 44.5mm / with 15° clip for HCF resistance and higher flow

Both of these turbos also have the following limits:

· Exhaust gas temperature – 950°C at turbine inlet (temporarily 980°C for max of 3 minutes)

· Turbocharger speed – 185,000 RPM

 

Great Info.! Though could u fetch the specs. on the 997.2 VTG's?

 

I am told the 997.2TT VTG specs are the same as the GT2 VTG's

 

Thnx again! Rep. for u

 

great info ..

rep for u

 

Awesome info Venkat! Thanks for sharing! My flow peaks about 30 lbs/min/turbo which is about what these are rated. These puppies start to choke up around 5500+.

 

TTdude

Your car on stock turbos, right?

Well we finally have the turbine specs, which have been a mystery.

 

I have the early Proto vtg upgrade which consists of 63.5 mm compressor wheel and clipped turbine but stock otherwise. Good job on getting the specs!

 

Is it possible your tune isn't using the turbos to their full potential? If the stock turbos can flow 32 lb/min and yours are upgraded you should be able to flow a lot more right?

 

I don't think so because my tune generates 1.5-1.6 bar of boost. The MAF and compressor flow are not exactly the same but not totally unrelated either which allows for some interesting comparisons. I'm sure BW bench tests their flows. Anyhow, you have to look at a compressor map to compare compressor efficiencies (which if Venkat could get his hands on one that would be a real coup ) but I believe its the trubine that limits flow in my set-up. The gt2 turbine side is larger so it can flow more air barring any other restrictions.

 

excellent thread!! Does anyone know the shaft diameter of the VTGs? Also what is the model code? are they K24/ K26??

 

For anyone interested, I just had my vgt's upgraded to 65mm billets and during that process I had my bearing and shaft replaced as well.