impreziv

yeh, the flat spot is prolly the boost escaping. i dont know alot about the RB25's cam specs, but i can imagine it to be ok on the top-end.

a while back i found a site that had these. but i cant find it anymore. anyone know who sells them? this is the style i speak of..

if you have an OEM turbo engine, it is best to keep your OEM cams, or replace them with cams designed for your engine. NA cams that are more aggressive, will have valve-overlap, meaning that at one point in their cycle the intake valve is open at the same time as the exhaust valve. so if you use this in a turbo engine, all your boost will go in through the intake valve, and out the exhaust valve before the spark even fires. if youre boosting a mild NA engine (meaning that the engine isnt a very high performing NA engine, like less than 100hp/L of displacement), then you should usually keep the stock NA cam for low boost. one good example is my VW 2.0L 8v engine (makes 110hp). there is no valve overlap on the stock cam, it is great for boosting. but my friend's Honda B18C5 has a small amount of overlap, so he changed the cams before running too much boost.

im wanting to upgrade my exhaust manifolds when i change my turbos (GT2860R's). im needing them to keep the turbo in the stock location, and i need to retain the stock flange. anyone know any aftermarket ones that flow really well? cheers

ok, i didnt know there was a PFC for the RB25DE so how much power could one expect from a 10.5-11:1 RB30DE?

thanks for the replys guys, that was the info i was looking for. do people generally use the RB25DE ECU for this kind of project? there is a local guy here that can tune those kinds of ECUs, would this be sufficiant?

im currently working on my project R32 GTR, but when i get bored of that project i really want to do an all motor RB30DE in an S13 coupe, or an R32 GTS. ive read through a bunch of the RB30 threads here and on other forums. i have a few unanswered questions... what compression ratio would you get adding an RB25 head onto the RB30? and from there, whats the easiest way to get a higher compression ratio? is there a piston set i can buy that will give me a higher compression? i think it would be really cool to do an 10:1 or 11:1, but i dont know how high people have gone. if anyone has any URLs they could throw my way, id appriciate it much.