[335BOY]

Originally Posted by dtcoff

The marketing people decide what HP they want to have as the official number. This way they make it more than the lower models and ensure a gap to the M3 and allow space for M2 to fit in. The only ones they don't underrate is the M5/6 I guess.

How do we know that? I bet the M5/6 guys all say their engines are under rated.

[bd307]

First run was pretty consistent with everyone else who has done dyno in stock form. Not so much for the other 2 runs.

[dtcoff]

Originally Posted by 335BOY

[/B]

How do we know that? I bet the M5/6 guys all say their engines are under rated.

As the "top' models they would be better off to not understate the HP. In this segment they've been playing HP games with the likes of AMG and RS models for ages. Makes marketing sense.

Gives them more play room under that to fit in M3 etc too.

[trey100]

Air pressure is shown dropped by 3" by the 3rd run which would lead you to believe they are at high elevation (3,000'). They may have corrected for sea level and assumed a non-turbocharged car?

[verbs]

Originally Posted by rich8566

Three dyno pulls today. Best of three HP= 351 Torque= 359

you should get your money back, those numbers are worthless.

[335BOY]

Originally Posted by dtcoff

As the "top' models they would be better off to not understate the HP. In this segment they've been playing HP games with the likes of AMG and RS models for ages. Makes marketing sense.

Gives them more play room under that to fit in M3 etc too.

I hear what youre saying but it makes very little sense if everyone is messing with numbers. When I toured the Porsche factory years ago they tested each engine with a 1% HP tolerance. 1% high or low and the engine went back and got rebuilt.

[alz0rz]

Between the huge delta in just 3 runs, air temperature differences and the correction factor being 'changed'.... these run logs are worthless.

[335BOY]

^agreed. Can't believe they charged for that session.