I hate technology!
3rd Gear Member
Joined: Sep 2007
Posts: 850
From: OH
The 3.7L 305 power is nothing but smoke and mirrors. Sure the 4.6L makes 315 in the 2010 GT, but that 315 power is backed by torque. That 4.6L pumps out 325 ft-lbf at the crank and actually holds on to its torque up to redline.
The 3.7L is all smoke and mirrors because its torque sucks. It only pumps out 280-ft-lbf and the only reason why it makes so much power is because of revs; it will hit 70000 RPM. HP by high revs is nowhere near torque, and trust me, even though it is only a 45ft-lbf difference, you will feel every bit of that torque when you step on the gas. The 4.6L's 325ft-lbf will still beat that 280ft-lbf even though their power outputs are almost identical.
The 3.7L is all smoke and mirrors because its torque sucks. It only pumps out 280-ft-lbf and the only reason why it makes so much power is because of revs; it will hit 70000 RPM. HP by high revs is nowhere near torque, and trust me, even though it is only a 45ft-lbf difference, you will feel every bit of that torque when you step on the gas. The 4.6L's 325ft-lbf will still beat that 280ft-lbf even though their power outputs are almost identical.
2nd Gear Member
Joined: Jan 2008
Posts: 363
From: Florida
5th Gear Member
Joined: Jul 2010
Posts: 4,404
From: Texas
It also comes down to gearing. A 2011 gt and a 2011 M3 make the same power, weigh the same but the m3 makes 100 ft lbs less torque. Quarter mile times are within a tenth. Because the m3 is really peaky for its powerband its geared super low to get into the high rpm fast and stay there. I'd bet a 4.10 v6 to beat a 3.55 3v.
The M3 4.0l does rev very high though, 8000RPM. But unfortunately, it's significantly weaker torque will begin to show itself when turning the shallower gears of OD.
I guess that is why none of the M3's overall gear ratios never come to that of that of an 11 GT's overall gear ratio. The engine would struggle to turn them or you would hit it's terminal velocity given air drag vs wheel torque to overcome it. But to the M3's benefit, I think it's Aerodynsmic drag coefficient is a bit lower and has to fight less to force itself through the air.
6th Gear Member
Joined: Feb 2007
Posts: 7,635
From: state of confusion
I wouldn't take that bet either way without knowing a lot more about the torque curves of both engines.
Peak values by themselves don't tell enough. All they're good for is bragging. Even this level of bench racing needs more information if you want an answer with enough reason to really believe in.
Peak values with the rpms at which they are developed is better, but still might not be enough to call this one. I haven't tried this match-up yet.
Gearing (including different tranny gearings) and all the other things that also matter can be looked up or made the same.
Norm
Peak values by themselves don't tell enough. All they're good for is bragging. Even this level of bench racing needs more information if you want an answer with enough reason to really believe in.
Peak values with the rpms at which they are developed is better, but still might not be enough to call this one. I haven't tried this match-up yet.
Gearing (including different tranny gearings) and all the other things that also matter can be looked up or made the same.
Norm
Last edited by Norm Peterson; Jul 23, 2011 at 10:03 AM.
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