Thread: S65 vs. S62
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      01-22-2013, 08:58 PM   #65
MKE_M3
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Drives: 2011 e90 M3
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Quote:
Originally Posted by bruce.augenstein@comcast. View Post
Torque isn't at all important when you are at redline. At any given speed, it's power that matters.
Not totally correct, since power is in linear direct proportionality to torque, torque is very important, you just need to know rpm and gearing to get the entire picture.


Quote:
Originally Posted by bruce.augenstein@comcast. View Post
Torque at the drive wheels is what ultimately can accelerate the vehicle, but first of all, wheel torque is not at its peak at redline. It peaks in any given gear at the engine's torque peak. At any given vehicle speed, however, wheel torque (therefore the ability to accelerate) will be maxed at the power peak.
Correct, but generally peak power is fairly close to redline, which I assume Munit meant.


Quote:
Originally Posted by bruce.augenstein@comcast. View Post
A vehicle's ability to accelerate at any given speed is essentially governed by its power and by its weight. Torque, gearing and engine speed (RPM) are essentially immaterial in that context. Yes, you can go about calculating wheel torque at any given vehicle speed, but horsepower is the great shorthand in this context. More power gives you more wheel torque at any given speed, so why bother with those extraneous calculations?
I think you are forgetting about the third component to acceleration, traction. Not too much an engine design can do here, but linear power delivery certainly helps. Something both engines have.

Quote:
Originally Posted by bruce.augenstein@comcast. View Post
It's just that, when you're way over on the ride-hand side of the tach with things getting all blurry and you're laughing like a loon, the low end feels as if it was way weak.
w00t!!!
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Last edited by MKE_M3; 01-22-2013 at 09:04 PM.