TB993tt

You can't compare the Maha transmission loss figure with other dynos it has its own unique calculation. From my experience 89PS is about right (my 997GT2 in standard trim measured a 99PS loss on a Maha)

I am a bit confused with the correction factor as that top "Korrigeret ydelse" should be a corrected power figure however looking at the temp and pressure the CF would be very low and your peak power figure would not change much.

Your gearing might make a difference although I wouldn't have thought so on a Maha....

It looks like you have a tuned motor, maybe give it another run on a different dyno ?

bovien

I asked regarding the gearing, and that should not affect the results on Maha.

Good idea with another dyno. Don't know when I'll have the possibility at a reputable shop though. Will check the local race shops @ Nürburgring next time I'm there.

Interesting with your 99 hp transmission loss.
I have always heard that 15%-ish is what a manual transmission should have, and @ my max expected 450hp (stock GT3+center bypass) that should be under 70hp. Big different up to the 90'ies..

TB993tt

The Maha measured transmission/tyres/LSD etc loss cannot be compared to other dynos, not even other (different model) Mahas. My 99hp loss was meausred on the Manthey Maha LPS3000 at 542.6PS EWG 80/1269 and a few days later the engine was measured on a Porsche turbo specific engine dyno at 544PS DIN so I am confident that at least the Manthey Maha was accurate in the way it extrapolated FWHP.

bovien

Cool. I'll pop by them @ next ring visit. We're there a few weeks ago looking at Endelss brakes. Nice people

bogey1

I have been told by several folks that the center bypass actually hurts the performance a bit on the 997.2. Not a ton, but a little bit. Certainly does not help the output, just sounds great. I had spoken with Jamie a bit at Dundon and I think he was hunting for a number up around 475, but that would have been with a full long tube header, custom tune, and new intake plenum etc... I suppose that all depends on the assumed driveline loss.