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Just a question, how high do people raise the boost on the EVO VIII? Isn't it already at almost 20psi from the factory?


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Originally posted by The Ripper:
Just a question, how high do people raise the boost on the EVO VIII? Isn't it already at almost 20psi from the factory?




I know that it's 19 PSI from the factory. If you have big enought injectors you can go a lot higher than that. Of course a bigger turbo would be needed eventually.

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Originally posted by ezsvt:
I saw an EVO VIII at the local track running 14.2 consistantly. Of course the track is a bit slow, but I thought for sure it would run faster than that. Probably not launching hard enough.




Well..my Bastard nephew ran a 13.19 bone stock (search the posts..I wrote all about it) in his Evo VIII...so 12.6 with a good driver with those mods is very possible...

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This Evo I worked on only had 17psi boost from the factory (tested with Autometer boost gauge). So I cranked it up to 19psi. Some of the boys on the Lancer forum are running 26psi with stock long blocks. Seems a bit high for a full time street car though.


What I was getting at before, by asking the question that some of you may think is BEYOND rookie, is that yes, I realize that MAF measures incoming air and all that, but when you get high boost psi in the intake fighting against the fuel line psi, then do you guys need to put on of those return line variable shutoff valves that boost the line pressure in the fuel rail so as to counteract the lean condition that exists, since the vacuum actuated fuel pressure regulator can only compensate for vacuum and not accomodate boost. Does this make sense to any of you? What comes in the turbo kits to correct this problem that only occurs during open loop operation? Or does the fuel trim automatically compensate for that?

Also, I'd like to thank the ones of you who gave me some very useful info. Any others just trying to piss on me can just go find a tree and hump it


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Originally posted by Josch:
This Evo I worked on only had 17psi boost from the factory (tested with Autometer boost gauge). So I cranked it up to 19psi. Some of the boys on the Lancer forum are running 26psi with stock long blocks. Seems a bit high for a full time street car though.



A little high!

Talk about well out of the efficiency range.

They are just pushing hotter air rather than more air.

I'd be happy to post Mitsu's compressor maps for you to lick Josch! Butt I digress...

Mitsu turbo's are designed and rated to run at 15psi (peak efficiency)

Anything past 19-20psi is just pushing hot air. Nothing more! So you actually did pick a good level to set it at.


Also boost level is a reading of the restrictiveness of the entire setup (intake, heads, chamber, exhaust etc)
It is not an tell-tale indication of MORE power.

This is a major reason why intake & exhaust mods generate such high increases on boosted vehicles. You just made the "setup" more efficient so therefore the subsequent "boost" pressure would drop. (not cfm flow mind you, just less restriction) However since the boost pressure is "preset" at a specific level via the wastegate actuator it's also like raising the boost too! Therefore it's really 2 increases in one. Not just the gains from adding one specific part.


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