2/17/2011
2002 m3, 63k miles, only mods:
3.91 gears
ZCP wheels
Dinan cold air intake
Rogue Engineering smooth elbow
Air Scoops by PowerM3
Dyno'd in 5th gear.
Baseline dyno on a DynoJet was SAE 288 hp, 240 tq.
Yesterday, new shop (Maximum
PSI) with a different brand dyno, super flo, and it made 286 hp, 234 tq. So
they were pretty close considering different test equipment.
Mike put the headers on and at first it made less hp than my baseline numbers. I
think that is because the computer has to recalibrate itself (needs to learn the new
airflow characteristics). There was no street driving at all; the car went right from the lift to the dyno.
So he kept making more pulls (6 in total) and finally it went to 297 HP and 240
TQ; a gain of 11 Hp and 6 TQ.
I think/hope that with more miles, less heat soak from continuous dyno pulls,
and a return to the DynoJet, it will make 300 hp (at least).
He didn't use rpm pickup so the speed was calibrated to the rpm's but it ain't
exact. And the air/fuel thingy is messed up.
Funny thing is that it looks like he let off the throttle early on the header pull....hmmmmm...now i really gotta hit the DynoJet!
Short
video of stock exhaust versus new headers and a dyno pull with the headers
Pics and notes from Maximum PSI regarding the header installation:
"There was a few fitment issues, one at the flange where the headers mate up to the midpipe and the other on the motor mount arm. We had to notch the mount slightly for it to fit properly.
3/12 Update: using a DynoJet
