Just dynoed my m30b35... not pleased.

[MrK]

I just got back from the dyno, and I am (to say the least) quite disappointed.

the dyno sheet showed me a 'corrected' 141.8 Kw, or about 190 hp at the crank :(

That is LOW for an M30B35. I also noticed that the car was running a little richer than it should (smoke out of the exhaust).

I checked compression, and it's practically perfect across all cylinders. Air filter and fuel filter are new, sparks are new.

I'm stumped. Anyone know what may be going on?

[bmw335isturbo]

190 hp not bad what were you looking for ?
I would check the A/R, Because you were saying it is running rich.
I would also try opening up the intake side Filter,Big bore throttle body. and what kind of exhost are you running?

I would say 190 hp at the crank is not bad I would think 190-205 and would not expect much more.

[terrybpp]

Are you using a euro e28 or e34 motor? The e34 had the most hp at 211. Add a few hundred thousand miles to that and you would be right around your #. Have you ever had it rebuilt?

[JGood]

nm I see you said crank

[Mike325]

You said crank hp. How do you do that with the engine in the car?

[Garageaholic]

Crank HP = (RHWP *.15)-RWHP

I'd say take 15% from the crank HP and you get the rear wheel hp.

What do you guys think it is for drivetrain loss in an E30?

[Jean]

It put down 142 at the wheels correct ? How much tq ?

[euroshark]

Do you have an aftermarket chip installed in the ECU? How is the condition of the exhaust? I would guess possibly a bad air flow meter, or bad cat.

[MrK]

No cat, and yes it had a chip in it. I replaced the stock chip and it ran much better. No more rich condition that's for sure. Oh, and I'm running a stock e30 exhaust, but with dual 2" pipes (a la 535i size). I haven't had the head rebuilt, but the engine only had 90k km on it, and compression tests revealed that all the cylinders were within 1 psi of stock spec. Oh, and the motor is a Euro M30B35 '92. According to my research, that should produce 218hp at the crank stock.

[bumpstop335i]

i got 135kw @ the wheels. with 380nm with a autobox m30b35 92' 735i

[CarsSuck]

its an engine design from the eff'ing sixties, what do you expect?

[george graves]

its an engine design from the eff'ing sixties, what do you expect?

Ummm what?

[Mystikal]

Air filter, fuel filter, o2 sensor...plenty could be wrong.

I'd start by dynoing again with A/F readings. I think doing without is useless anyways.

[bumpstop335i]

im in need of a rising rate FPR. MrK does your dyno look like this?

[MrK]

I don't have my dyno plot at hand ATM, but the curve is much smoother than yours... I don't think I have an A/F ratio problem... My hp curve goes up to almost max at around 3.5k rpm and just rises slightly after that, dropping off at about 6.1K rpm.