Quote:
Originally Posted by austinla335d
You might want to familiarize yourself with 335's and current tunes, and then apply that to what we can only assume about the M3/M4... which may change as details are revealed. 
My 2008 335i dyno'd 278whp stock and 336whp on 91 octane JB4 ($479 tune). That's 58whp on a tune, roughly equating to 65hp, give or take.... considering drive train loss, 336whp is certainly in the range of ~375hp on just a tune.
The difference from stock to tuned is what matters, so maybe you came across someone making 310whp on a tune, but their original hp figures would've been around 240-250whp. Go to the 335 forums and find those figures... I don't recall seeing anyone making that little of an increase, ever (30-40whp on a JB4 or Cobb, for instance).
Since we are literally talking a nearly 400hp car on just a tune (335i), I want to encourage the M3/M4 world. This is going to be a 500+hp car on a tune with a bolt on or two. Figure catless downpipes, if four cats exist, will add 25-30whp and a FMIC and intake will add another 25-30whp. A tune on top of that? Good grief.
The only mention worth making is that the 335 had terribly restrictive attributes, while the M3/M4 might be pushing it a bit more and already have a fairly efficient intake, fmic, tune, etc.
Looking forward to a curb weight, and believe it or not, MPG figures. Could never justify the E90 DCT based on terrible fuel economy. With the turbo 6 we might see high 20's on the highway. |
I hadn't looked at the N54 gains recently. Your car basically nailed what BMS got from their test car with just a tune (about 65whp).
I've been following the N55s more since that's what I've got and the single turbo just isn't quite as easily tapped. BMS got around 310whp with just a tune (30whp'ish). I guess I should've snapped up the '12 335is instead of the F30 335i I ended up with... (I haven't dyno'd mine but my butt dyno says I got closer to 30whp like their car and not 60+ whp with their JB4 Stage 2 for the N55)
As a note, the BMS folks and the community have come to the conclusion that the 550 engine is a detuned version of the M5/M6 and threw on a really safe tune and got 25whp out of it. Not sure what that may mean for the new M3/M4 though.