Originally Posted by blackssei
all I know is when I add a 3.4 from the stock 3.8 I get about 25hp gain...boost rises about 3psi....and if Rockers decrease the boost PSI...Logic would assume that the HP is lost as well.
I understand your thinking, but you gained that extra boost buy turning the superchager faster and that added boost, now the rockers help the engine flow better so there'* less back pressure, meaning less boost, but the supercharger is still turning the same amount as before so flow is the same, so this loss of boost is GAINING POWER by effiency. Now you can add a smaller pulley to bring that boost back up and gain even more power, assuming it'* not making more KR.
Adding headers will also lower boost because of increased flow, than smaller pulley to bring boost back up again.
Me I have 3.4 now with rockers, headers going on next weekend, will see how much more PSI is lost. Take it to my buddy with Atap, go for a run and than slap on a 3.2 and atap again, I'm confident all should be good.
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