Quote:
|
Originally Posted by Esky
Ok, so it's like intake pipe design- short & fat for good hp and long & slim for good torque.
So why aren't the VTECs using shortie 4-1, since most of the time the aim is for max bhp?
|
Sort of.. You have to understand Torque and HP better than what your statement seems to indicate...
HP=Torque x RPM / 5252
Hp IS Torque across the element of time. Your statement should really say. " short & fat for PEAK hp at high RPM and long & slim for PEAK HP at low RPM."
You normally attempt to tune so that your engine produces it's peak HP at the RPM range you are going to operate at. NOT neccessarilly just peak HP.
IE. One could design the induction system so that the peak occurs at 8500 RPM and your HP would be very high. But if your engine can't live there or your drive train ratio aren't practical at that point it would make no sense. Plus at low RPM, the engines limited torque would make it less driviable.
If however, 6000 is where it is tuned for you would be able to operate the car in it most effective range. Your HP peak would be lower but the area under the curve that is utilized would contain more HP.
I don't know about the V-TEC shortie, but again remember, the aim is not for max HP, but for max HP under the curve in the area you will be operating the engine in normally.
Jim
SR Racing