Quote:
Originally Posted by GotBoost?
Granted I have never swapped cams out in a 4cyl (only done it on an LS1) but depending on how aggressive you go on an LS1 you can see 20-60HP gains easily. So you will have to excuse me if I don't understand how you can only expect a 15hp gain from cam's and an exhaust.
Also a quick google search tells me that in a 2.5RS with an aggressive cam you can see an increase of around 50whp in a bolt on car. Throw in some heads with that and your looking at around 80whp.
Your also not even considering tuning the motor.
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LS1 has 3 times the displacement, divide 60 by 3 and you are in the ballpark I mentioned. I don't think you add it up that way, in the 2.5RS example ( I may be wrong...). To be able to use the aggressive cams you need to be able to flow enough air anyways. Very aggressive cams can also hurt fuel economy, low speed performance, idle, etc. pretty bad.