lowering compression on 4b12
Apr 22, 2011, 08:52 PM
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lowering compression on 4b12
ok so im going the turbo route pretty soon but i have a 4b12 10.5:1 CR so im only able to run the stock ra 7psi , wich is ggod for me for now but i know i will try to get more pretty soon lol , ok so the only way to run more boost is to lower my compression i will actually love to achieve the X 9:1 CR but idk if its even possible. i know to lower the compression i need either different pistons( i cant find them on a 88mm bore the closer is 87 mm for the evo x 2.3 stroker kit) or put a thicker head gasket (which i really have no idea where to get ) lmk if u guys have any idea about how this can get done i would love to know if the evox has a ticker gasket than the 4b12 to see if at least it can put me on 10:1 so i can get my evox waste gate and discard my RA thx for the help i will post the same question in different forums to see if i get any help
Apr 25, 2011, 11:15 AM
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ok so im going the turbo route pretty soon but i have a 4b12 10.5:1 CR so im only able to run the stock ra 7psi , wich is ggod for me for now but i know i will try to get more pretty soon lol , ok so the only way to run more boost is to lower my compression i will actually love to achieve the X 9:1 CR but idk if its even possible. i know to lower the compression i need either different pistons( i cant find them on a 88mm bore the closer is 87 mm for the evo x 2.3 stroker kit) or put a thicker head gasket (which i really have no idea where to get ) lmk if u guys have any idea about how this can get done i would love to know if the evox has a ticker gasket than the 4b12 to see if at least it can put me on 10:1 so i can get my evox waste gate and discard my RA thx for the help i will post the same question in different forums to see if i get any help
you could do the same thing Im doing. Buy the ATP o2 housing dowpipe, it comes with a 38mm flange so you can run an external wastegate. Get the downpipe, and buy a ewg with a smaller spring.
Apr 25, 2011, 11:53 AM
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That doesnt help me u have a 4b11 with a 10:1 cr mine is a 4b12 with a 10.5:1 thats the problem i can run a lot of boost cuz ill cause my engine yo knock
Apr 25, 2011, 11:59 AM
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if you built your turbo kit right, you dont need more then 5-7psi to hit 200-220whp. & honestly you dont need more then that and you dont need to lower your compression ratio.
Apr 28, 2011, 08:32 PM
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Hahaha, we actually don't need more than 50 WHP in a carto get to 100 KPH... The question is not how much power is needed, it's how much power we want!!!
To OP, I might be totally wrong but have you tried look at pistons for the SRT4? Or a Hyundai with the same engine core and bore?
To OP, I might be totally wrong but have you tried look at pistons for the SRT4? Or a Hyundai with the same engine core and bore?
Apr 28, 2011, 08:56 PM
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i did look around for pistons , theres a lot of speculations but no facts and im not into being a guine pig.... and of course is not about hitting 200 whp and be happy about it any turbo lancer can hit that i want moooooore , lol is addicted this mod **** , im not really a lot into looks my car is a stock es i just want performance , and one day hopefully reach the 300 whp with my 4b12 lets see what happens idk , im def not aiming into taking evos im aiming into being one of the fastest lancer tou i know i have a tuff competitor ( dadgts) im always going to be a couples steps behind lol but im a good copier too , main thing is that there no hate just a lot of respect and a lot to learn 
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Apr 28, 2011, 11:34 PM
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lol oh well i take my lancer to the track alot so thats why i think 200whp is plenty. but if you want 300hp, go for it. Just make sure you work on actually transferring all that power to the road. Its the only way your gonna beat anything.
Apr 29, 2011, 07:55 AM
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i did look around for pistons , theres a lot of speculations but no facts and im not into being a guine pig.... and of course is not about hitting 200 whp and be happy about it any turbo lancer can hit that i want moooooore , lol is addicted this mod **** , im not really a lot into looks my car is a stock es i just want performance , and one day hopefully reach the 300 whp with my 4b12 lets see what happens idk , im def not aiming into taking evos im aiming into being one of the fastest lancer tou i know i have a tuff competitor ( dadgts) im always going to be a couples steps behind lol but im a good copier too , main thing is that there no hate just a lot of respect and a lot to learn
May 15, 2011, 10:14 PM
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hey whats up villero, so ur on this forum too lol!! but yah man lower compression the most i have seen done to lower it was stronger pistons, ive looked at the srt-4 dodge caliber and most of the internals for that engine, its compression got down to 9:1 so it seems like the same, but if you wanna be the fastest 4b12 lancer on the street sometimes you need to be that guine pig :P
