[FuliM4]

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Bone stock eu spec M2C DCT on dyno.

Before 2000km service, (~1.200km on the clock ) 5th gear, ~25 C* degree.

3x times dyno run:
418 Hp / 612 Nm
419 Hp / 620 Nm
422 Hp / 622 Nm .

We can say 420hp and 600nm ( from ~2600to 4000rpm ) without the overboost right after the boost build up.

Oem boost curve is 1.1 to 0.9 bar. ( ~0.1bar less than stock M4 boost up top )

[carl44]

isnt HP and torque supposed to cross @ 5252rpm? carl

[AlpsRider]

Originally Posted by carl44

isnt HP and torque supposed to cross @ 5252rpm? carl

The scale of the HP and torque are not the same in the graph.

[FuliM4]

Originally Posted by boostm3

They must do things differently over there. Over here, dynos report rwhp.. thats rear wheel horsepower.. Your dyno software must be converting what they found to engine power. So those are engine power numbers? Do you know what factor they used to derive that?

In the EU we usually measure crank horsepower, just like the manufacturers, like bmw. We can count around 15% drivetrain loss on the wheels. But there is a big difference between dynos, especially in the US the dynojet, mutang and the like dynos usually measure higher numbers. On an s55 you can make around 570-580 crank hp on pump fuel ( its around 480-500 whp max ) with stock turbos, you only need a flash and catless downpipes. For the same setup us dynojet dynos usually measure 530-550whp, which is way too high numbers...

[//M]

Originally Posted by carl44

isnt HP and torque supposed to cross @ 5252rpm? carl

The scaling for one but also this is horse power and newton meters not horsepower and torque.

I made the same mistake recently.

[doughboy]

Originally Posted by //M

this is horse power and newton meters not horsepower and torque..

A Newton meter is a unit of torque.

Do mean pound-foot?

[///M Houbi]

No worries about the motors longevity when it is pushed so hard so early in its life?

[n55co]

you should always use EWG as correction, not DIN
(DIN is outdated)

Thanks for sharing the dyno result

[zenmaster]

Originally Posted by FuliM4

In the EU we usually measure crank horsepower, just like the manufacturers, like bmw.

Except crank HP is not being measured "in the EU". Too expenseve unless you're BMW. Huge difference between measuring and guessing actual crank.

[n55co]

Originally Posted by zenmaster

Except crank HP is not being measured "in the EU". Too expenseve unless you're BMW. Huge difference between measuring and guessing actual crank.

guessing? measuring wheel hp + measuring power loss + correction values = crank hp
Of course you should run it on a good dyno, which is actually measuring the power loss like e.g. MAHA dynos
Not sure why that should be guessing...
Measuring wheelhp is giving you not comparable figures.

[chris719]

Originally Posted by n55co

guessing? measuring wheel hp + measuring power loss + correction values = crank hp
Of course you should run it on a good dyno, which is actually measuring the power loss like e.g. MAHA dynos
Not sure why that should be guessing...
Measuring wheelhp is giving you not comparable figures.

How does a dyno with only rollers actually measure drivetrain loss? The MAHA may be able to more accurately estimate drivetrain loss during the coast down but it's still an estimate. The only 100% accurate value is measured at the actual crank.

Still, I would agree the MAHA dyno is probably better than using a 12 or 15% correction factor.

[n55co]

Originally Posted by chris719

How does a dyno with only rollers actually measure drivetrain loss? The MAHA may be able to more accurately estimate drivetrain loss during the coast down but it's still an estimate. The only 100% accurate value is measured at the actual crank.

Still, I would agree the MAHA dyno is probably better than using a 12 or 15% correction factor.

Agree, for 100% accuracy you have to test it on a engine dyno.
But MAHA is the closest you can get to an engine dyno result.