For the DTMpower crowd

[BMW Maniac]

I just recently had my car redyno'd on a Mustang Dyno:
GT35r, M50 manifold, NickG tuning, 3.5" HFM, full 3" exhaust, 15psi: discuss....

[Highboosted]

To tell you the truth, I think you need a new tune. Your AFR is all over the place, and it makes your power delivery not smooth at all.

You got power all right, but that curve is definitely something I personally wouldn't be satisfied with.

[edit]: To give you an idea, mine looked like a flat plateau. 11.7-11.8 the entire rev range. Not a BMW, but there's no reason you should have anything less.

[BMW Maniac]

Originally Posted by Highboosted

To tell you the truth, I think you need a new tune. Your AFR is all over the place, and it makes your power delivery not smooth at all.

You got power all right, but that curve is definitely something I personally wouldn't be satisfied with.

[edit]: To give you an idea, mine looked like a flat plateau. 11.7-11.8 the entire rev range. Not a BMW, but there's no reason you should have anything less.

I think if the graph wasn't so blown up, it would look a lot better...but you may be right.

[Josh]

I have to say I'm having a bit if a hard time reading that graph. Your A/F looks like it is all over the place, but I can't seem to find by which scale (increments) it is measured at.

Could you list out the specifics of your setup?

[BMW Maniac]

AA Stage II basically: piping, stage II intercooler, AA headgasket, AA exhaust manifold, M50 intake manifold, Nick G tuning and injectors, GT35r, full 3" exhaust.

Nick says the AFRs are normal, but the graph makes it look worse than it is.

[DVS318]

that is kinda hard to read, seems that your AFR is everywhere yet your max is 12.8 low 11.0 and average 11.9........ doesnt seem to make sense, not to mention is that straight diaganol line supposed to be your torque?

[Highboosted]

Look at the colors people, it's not that hard. Look at the black graph:

Straight diaginal like is engine RPM, bright white is AFR (AFR numbers on right), green is HP and brownish is TQ (HP numbers on left, but TQ is scaled to match HP in height, which is why the graph doesn't cross at 5252 RPM).

Yes, they could have scaled and displayed it better, but it's readable. Damn I look at too many of these... Which is why I instantly noticed your AFR is messing up your TQ output, resulting in poor power delivery charactaristics. 20 minutes with something as simple as an AFC can fix that, or a reflash.

[BMW Maniac]

I think it could be better...but how much more power could I expect? Is it worth sending out my DME again? I'm not sure. The car feels great, no real issues...so why mess with it? Now, if messing with the tune could yield about 25 more rwhp/more tq...that might be something to look into.

[Highboosted]

Your peak power (and TQ actually) was produced during a downswing in the AFR, so you not going to gain a significant amount, because during your peak outputs your AFR is where it should have been. My car makes basically the same peak HP and TQ numbers no matter how bad the tune is, as long as there's enough fuel to burn in the cylinders (i.e. puking black smoke rich still results in decent numbers, but not exactly conductive to smooth power delivery).

Basically what you get is more "area under the curve", or better stated, more average power, when you have a good tune. Those huge dips in your TQ curve is hurting your average power. If your satisfied with your car's performace (and don't get free reflashes like I did when I bought a custom chip for the F-150, great gig that was), then be happy. Just keep that in mind, but if I were you, I wouldn't bother on that reflash for a while, because the mod bug always bites, lol.