pzull

I have been trying to get more information on how a K27HFS differs from the stock turbo in terms of:

1) Exhaust housing size
2) Impeller housing size
3) Turbine and Impeller blades
4) any other differences

Someone showed me a modified K27 (dont know what its called) for his 930 and compared side by side with stock and it looked like it had much larger housing for both exhaust and intake, very different looking "blades" on the impeller with edge of blades chopped off flat

Kevin

The K27 HFS is based on the 27-7200 platform. This means that I retain the 7200 turbine housing and turbine wheel. The "S" version of the Hyflow series comes with a 3'" inlet tapered to the 60.5 mm high efficient compressor wheel. The stock compressor wheel measures 54mm. If you do a search you will see pictures that I posted.

pzull

do larger exhaust and/or inlet housing lead to increased turbo lag? that;s what I have been told is the drawback but the boost at higher revs is stronger and longer.

Kevin

Larger turbine wheels and changing to a larger A/R turbine housing will increase the lag. The larger compressor housing will usually be determined by the increase of your compressor size.