In case anyone was curious... This was posted on another forum but I'm reposting here....
Thanks to Harith for posting on the other forum.

 

Hard to tell what the results really mean but looks like 391.6 peak PS and 413.2 peak nm torque. So 386 hp and 304 tq.

What kind of dyno though? Also wonder if those are actual at the wheels or interpreted crank power...

 

Would be nice to have a 991S right after it for some comparability. Wishful thinking but yeah, agree with the above poster, hard to tell what is really going on.

 

Blue line appears to be wheel PS/hp and green line is losses.

 

Its a MAHA dyno

 

If this is at the wheels, it is either a very high reading dyno or porsche is lying about power output. http://www.mr2ownersclub.com/converter.htm

 

Trying to interpret these foreign dynos is like racking your brain to understand the metric system...can someone just strap it down on a good ol' 'murican dynojet?

Just sayin'

 

The blue line/number (P-Rad) is the measures hp at the wheels. The green number (P-Schlepp) is probably a coast-down measurement (trying to measure the drivetrain losses). P-Mot is the sum of these two and P-Norm is P-Mot + a correction factor for temp/humidity, etc.

The baseline numbers aren't anything to write home about but, since every dyno is different, that may mean nothing. As others point out, the only way to confirm "real" horsepower is to correlate with another, known car (on the same dyno, on the same day).

 

^^^Metric...

 

Exactly what I would have expected for this car knowing the type dyno, what is on the car and what to expect. One number is an interpolated crank number and the other wheel power. No surprises.

 

Maha dyno printouts are at the crank typically (to my knowledge).

 

A chassis dyno cannot directly measure power at the crank. Any such number is derived/estimated from measurements at the wheels (see Post #8).

 

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The photos show the car on the rollers. An engine dyno (only way to directly measure crank hp) requires the engine to be removed from the car. The crank HP numbers are derived in a weird way - almost 25% drivetrain loss assumed which seems very high.

Part of that very generous conversion factor must be due to the high 88F temp.