Quote:
Originally Posted by tdizzle
I think they may be overselling the tune if anyone is claiming 400hp with 'just' a tune. Tunes alone can add 30-50hp at the wheels putting you somewhere in the 350hp area perhaps if we actually knew what the drive train loss is. I don't think anyone is gaining 100hp on a 335 with only a tune on normal gas, at least not one that won't run the risk of blowing your engine.
Common is about 300-310whp with a 'safe' tune. Now add in DP, E85, Meth, etc which allows you to safely turn up the boost and then you start to see the big numbers and make a M3 see tail lights, at least in a straight line.
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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.