Originally Posted by
Chris111
You out words in my mouth. I'm looking for earlier torque and more of a smoother powerband. I'm nt expecting huge numbers at 2.5k rpms with a centrifugal charger. I want to maxamize the powerband in my rather short rshared_pm range.
The m90 is very common on the ka and will produce 200-250 torque at 3k rpms at 10psi on pump gas. That's awesome torque at 3k rpms for a inline four. However, I don't think the m90 has a lot of power left. I could be wrong but I dot know what people push these to.
Any thoughts?
The Eaton superchargers are torquey at low RPMs because they are of the positive displacement design, with optimum efficiency coming in at comparitively lower engine speeds than a centrifugal charger.
Obviously, any supercharger or turbo should be sized to the particular engine, the intended use, the intended RPM range, the vehicle particulars and so on.
Without taking all of that into account and giving it the consideration it deserves, the results will almost always suffer in some way.
You havent really said what you are trying to accomplish here. A properly sized and designed turbo system can provide plenty of torque, horsepower and a wide powerband. Ditto for a centrifugal supercharger. And for a positive displacement one. And for nitrous. All of them have tradeoffs and compromise.
We could literally spend weeks going into all of that. Its much easier if you narrow down exactly what you need and expect from a system. If, to do that, you need some good formulas and info for consideration, Corky Bell's book Maximum Boost is a pretty good start. Amazon might have a few copies for sale.