Quote:
Originally Posted by GasperG
I was talking about Torque, Torque in diesel engine can drop but the power remains or even increases (power = torque * rpm), going even higher it starts to drop quickly.
Torque curve in NA petrol is a lot more even (level) in that 3.7 L you are looking at 300-400 Nm through the whole rpm range, but this means a very steep power curve, diesel engine has a lot more level power curve.
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agree, the turbo diesel motor reaches soon the torque peak and soon after the curve drops (more or less rapidly). Anyway even if dropping, the torque release remains high, adding to this the lowrev nature of a turbodiesel engine, and we have a car that is in the range of >1000->900Nm for the whole race! even if the torque peak rpm range is so low that isn't reachead even after a slow corner.
The toyota 3.7 V8 surely works as standard small-medium NA displacement race engine. Torque curve constantly rises, reaching a peak close to the revlimiter (in my speculation 7000rpm torque peak, 8500rpm revlimiter) and the final power is a direct consequnce about how much critical is the torque drop after reaching the peak. Look at the street 458 italia and 458 speciale:
458 italia TP is 540Nm@7000rpm -> torque drops -> FP is 570hp@9000rpm
458 speciale TP is 540Nm@7000rpm -> the engine is more optimized so the torque drops less -> FP is >600hp@9000rpm
To me figures are:
audi 4.0 V6 TDI - TP 1000-1100Nm@2000-3000rpm -> FP >550hp@4000rpm
TMG 3.7 V8 - TP close to 500Nm@7000rpm -> FP >550hp@8500rpm
Of course, just speculation.
Porsche engine specs are harder to speculate.