Rolling Road

[thegingerninja]

You should NEVER brake during run down - it makes the BHP "appear" higher than it actually is. You need to go to a dyno operator who has some experience of M3's. There is a little trick required to get them to rev out correctly - sworn to secrecy I'm afraid.

[Windowlicker]

You should NEVER brake during run down - it makes the BHP "appear" higher than it actually is. You need to go to a dyno operator who has some experience of M3's. There is a little trick required to get them to rev out correctly - sworn to secrecy I'm afraid.

Is it any of these methods ???

http://m3blogs.com/2006/01/30/dyno-measuring-issues-with-the-e46-m3.aspx

[DazBlackCSL]

You should NEVER brake during run down - it makes the BHP "appear" higher than it actually is. You need to go to a dyno operator who has some experience of M3's. There is a little trick required to get them to rev out correctly - sworn to secrecy I'm afraid.

Well said ... aside from my bias , only through experience .. :whistle:
Thorney has buckets of experience with CSL's and M3 would not , outside of that others like BM Sport / Bexley and simpsons ... trust my pride and joy to any monkey with 10 mins experience

[glendog74]

Here's the print out from my Stage 1 at Thorney back in August - 370.7bhp at the flywheel:

[Radders]

not too proud of this, perhaps some had filled the car with diesel? :hahaha:

anyway the report that the previous owner had done.

[_Nathan_]

355 on the Simpson dyno is good - it isn't as optimistic as some of the others...

[Radders]

355 on the Simpson dyno is good - it isn't as optimistic as some of the others...

:smt055


:thumbs:

[glendog74]

355 is just fine for a standard car :smt023

[NZ_M3]

Any updates Mark?

[AlexGTT]

355 is just fine for a standard car :smt023

Indeed, that is bang on the money. Mine did 360bhp on Simpson's dyno after some fettling. Initial runs were down around 340bhp but we noticed it was just running a tiny bit richer than most CSL's they'd seen for some reason.

If you speak to them, most standard CSL's they see run around 355.

The videos of the CSL on the dyno earlier in this thread don't sound right at all. Braking on the dyno durring coast down is just wrong and the induction doesn't sound right for a car reving to max rpm. Are you sure the airbox flap was opening? Doesn't sound anywhere near as animalistic as it should. Personally, I'd only let a specialist put mine on the dyno, as mentioned earlier in the thread.