Just dynoed my m30b35... not pleased.

[MR 325]

cause any car could take it to 95mph on the track.

Not true, you only have a 1/4 mile to run and a lot of cars won't even break 90.

[92 mtechnic cabrio]

who said the dyno is correctly calibrated? Take it to the track and get a trapspeed you should be able to get 95mph and if you do then there is no problem. Otherwise post up the graph for us and you should see whether it dies at the topend or is down across all rpms.

do you mean like....drag strip?

cause any car could take it to 95mph on a track.

[Mystikal]

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.

That sounds exactly like an A/F problem, actually.

Not saying it couldn't be other things, but askew A/F does exactly that.

[digger]

who said the dyno is correctly calibrated? Take it to the track and get a trapspeed you should be able to get 95mph and if you do then there is no problem. Otherwise post up the graph for us and you should see whether it dies at the topend or is down across all rpms.

[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.

[bumpstop335i]

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

[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.

[george graves]

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

Ummm what?

[CarsSuck]

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

[bumpstop335i]

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

[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.

[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.

[Jean]

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

[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?

[Mike325]

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