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Bad assumptions... (archive)

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Posted by Zandr on April 20, 2000 at 13:26:45:

In Reply to: Oh, and BTW... posted by Justin on April 20, 2000 at 12:52:27:

: : Now, determine the relation to time and voila...

Determine it how, exactly? Read on...

it may have only a little more peak torque, but it is using that for longer... imagine if you could use the peak torque in your 3.2 I6 for LONGER over the rev range. You still got your torque, just for a longer period...

You don't have enough information to say that. Look, peak torque on the current Euro motor is at 3250, peak torque on the current US motor is at 3800, and peak torque on the new motor is at 4900.

Almost 5-grand!

Your "torque for longer" statement is assuming that the torque is still there in the lower part of the band, which I think is a bogus assumption. What makes an engine flexible is a flat torque curve. It's the area under the curve that matters, not the height, or position of the peak.

Take the S2000, for instance. It makes 153 lb-ft at 7500 rpm. Oooh, look at how high the torque peak is...but there's NOTHING below that. If you look at a dyno run of that motor, there's about a 30lb-ft bump that happens around 6500rpm. It's a dog at low RPMs, plain and simple.

This is the fear when you start seeing max power and torque way up high, like with the new M motor. Until someone shows me curves, I'm inclined to believe (especially based on the small improvement in 0-60 times) that the low end has suffered.

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