s50 vs m54 vs m50 vs m30 dyno

[JJe30]

I'm not sure. I had gregslow do my harness. I'll have to check into that.

[balooshinakus]

It could be. Is your speed sender hookup up to the ECU? If it isn't that is definitely your problem.

[JJe30]

Could it be a tune issue? Guy at the dyno said it might be but he highly doubted it.

[JGood]

I thought it was too quick of a drop for it to be a fuel issue.

I'm not expert, but I'd agree with this. It looks like at 6249 it's making 190whp, and at 6250 it's making 155whp. It it was a fuel pressure issue, I'd think it would be more gradual. It might be fuel being cut, but I think it's a controlled cut, not a pressure issue...

[hoveringuy]

It kept reving to red line (7k) it just dropped in power. Guy at the dyno though maybe fuel issue. So I'm going to start with checking fuel filter and pump and go from there when I get home.

I thought it was too quick of a drop for it to be a fuel issue.

[e30polak]

for comparison dinan chiped m60b40 same dyno different day

That must be a blast in an e30! :twisted:

Does that m50 cut out at 6200 RPM's and basically stop accelerating? My buddy had a problem with his m50 where the ground wire that comes from the injection wire harness, out to the vanos bolt, was broke, and the engine cut out at around 6200. Felt like a rev limiter in a way.

Or it could be like my old car - was an auto to manual swap, and the speed sensor was never hooked up. After getting rid of the TMS chip with the speed sensor delete, I got fuel cut at 6200.

[JJe30]

It kept reving to red line (7k) it just dropped in power. Guy at the dyno though maybe fuel issue. So I'm going to start with checking fuel filter and pump and go from there when I get home.

[JGood]

Does that m50 cut out at 6200 RPM's and basically stop accelerating? My buddy had a problem with his m50 where the ground wire that comes from the injection wire harness, out to the vanos bolt, was broke, and the engine cut out at around 6200. Felt like a rev limiter in a way.

[nando]

yeah, seeing those comparisons make me feel a lot better. this particular dyno doesn't seem optimistic at all.

[balooshinakus]

do you have *.drf files you'd be willing to share?

Yes, I will post them when I get home if Steve doesn't beat me to it, I have the files for all 5 cars.


I'm not really sure why the m30 put down so little power, it seems like it should be making more then that.. Then again, the turbo'ed m30 was only at 250whp so maybe the NA m30's numbers are okay.. I thought it would put down more power though.

[gregslow318i]

Here is just my M54 (blue) against the S50 (red). I would get the hole shot on Joe and then he'd pass me on the straight.

for comparison dinan chiped m60b40 same dyno different day

[Bimmerman325i]

Really cool info, thanks for posting!

Makes the m50 + boltons + cams option much less attractive. Spend S50 money and maybe make stock S50 power if it wasn't running so lean.

I must haz TCD turbo kit and E28.

[nando]

do you have *.drf files you'd be willing to share?

[hoveringuy]

Here is just my M54 (blue) against the S50 (red). I would get the hole shot on Joe and then he'd pass me on the straight.

[HarryPotter]

Those m30 numbers make me hawt.

I really want an m30. Some guy had two e28's one with a 3.3L and the other was the b27 he wouldn't separate them and wanted 1k for both. I tried to get him to sell the 533i for 500 bucks but he wouldn't budge.