greenmac80 Posted August 30, 2008 Report Posted August 30, 2008 (edited) Okey dokey for all you experts.... i would like some advice on turboing my 20v. what would be a good compression ratio to aim for and how to achieve. there is a guy in the states though with a rotex charger running stock internals. but has ported the exhaust side and is running 15psi and has been for 9months. i reckon that asking for trouble with such a high comression ratio. i want a decent power gain in the region of 150-160kw atw. but i don't want to lose off boost driveability. cheers, Luc Edited August 30, 2008 by blackrolla80 Quote
original Posted August 31, 2008 Report Posted August 31, 2008 i want a decent power gain in the region of 150-160kw atw.but i don't want to lose off boost driveability. cheers, Luc 8.9:1 pistons out of the later model 4AGZE Bluetop and red-black top 9.4:1 has been successfully done aswell. with a really good tune, i have also seen a silvertop with stock internals run a TD05 successfully Quote
Jono Posted August 31, 2008 Report Posted August 31, 2008 i run a smallport 10.3:1 with 10psi no problems, off boost is great and it hammers when on boost. 98 octane and a good tune and your all good. Quote
machg Posted August 31, 2008 Report Posted August 31, 2008 8.9:1 pistons out of the later model 4AGZE Bluetop and red-black top 9.4:1 has been successfully done aswell. with a really good tune, i have also seen a silvertop with stock internals run a TD05 successfully ...except GZE pistons are for a 4 valve head, not a 5 valve one. Quote
greenmac80 Posted August 31, 2008 Author Report Posted August 31, 2008 sooo perhaps just run a turbs and don't change anything. if the internals are that strong then it should be reliable. i guess the tune is the most important just need to keep it away from detonation. anyone else got experience? Quote
machg Posted August 31, 2008 Report Posted August 31, 2008 Low boost should be O.K. with stock internals, 98 octane and good tune, (don't forget a decent intercooler) Quote
greenmac80 Posted August 31, 2008 Author Report Posted August 31, 2008 what is considered low boost? 10psi? power output? a ball park figure. Quote
greenmac80 Posted August 31, 2008 Author Report Posted August 31, 2008 16v right? should maybe get a bit more outta a 20v? Quote
Jono Posted August 31, 2008 Report Posted August 31, 2008 i'm not sure if the quad throttle bodies, lighter rods and extra inlet valve will make much of a difference once you go forced induction, could be wrong. most of the high powered 4AGTE motors are 16v. Quote
Sam_Q Posted August 31, 2008 Report Posted August 31, 2008 ...except GZE pistons are for a 4 valve head, not a 5 valve one. doesnt matter, has been done heaps of times, the engine just becomes an interference engine Quote
original Posted August 31, 2008 Report Posted August 31, 2008 (edited) doesnt matter, has been done heaps of times, the engine just becomes an interference engine gah! you beat me... Will only become a problem when you snap your cam belt :fuzz: most of the high powered 4AGTE motors are 16v. don't mistake that for most common base. can't remember where if ound it but technologically (lol sp) both the silvertop and blacktop head are better in areas of efficiency etc. Ill try find it.. Edited August 31, 2008 by original Quote
machg Posted September 2, 2008 Report Posted September 2, 2008 doesnt matter, has been done heaps of times, the engine just becomes an interference engine ...but if your going to go through the hassle of changing pistons, why the hell would you put in GZE pistons into a 20V? Surely there's a better option than that... Quote
Jono Posted September 2, 2008 Report Posted September 2, 2008 GZE pistons are a really good, cheap option and take a lot of boost. Quote
machg Posted September 2, 2008 Report Posted September 2, 2008 GZE pistons are a really good, cheap option and take a lot of boost. Fair enough. Quote
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