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stock boost psi?

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Old May 31, 2008, 02:45 PM
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stock boost psi?
what is the maximum boost psi from the factory on a 2005 Evo VIII MR?
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Old May 31, 2008, 02:58 PM
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The boost changed on diffrernt loads,meaning diffrent gear and rpms.The boost on should be around 20psi and taper off to 14 psi at redline.
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Old May 31, 2008, 04:26 PM
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Originally Posted by IDRINKV8'S
The boost changed on diffrernt loads,meaning diffrent gear and rpms.The boost on should be around 20psi and taper off to 14 psi at redline.

Thank You!
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Old Jun 3, 2008, 03:55 PM
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My stock '06 IX was reading 18psi -14psi at redline. Hope that helps.
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Old Jun 3, 2008, 04:07 PM
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Originally Posted by golgo13
My stock '06 IX was reading 18psi -14psi at redline. Hope that helps.

I also have an 06 IX and it was @ 18-19psi tapering to 14psi
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Old Jun 3, 2008, 10:03 PM
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n/m just saw your sig.
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Old Jun 5, 2008, 12:20 PM
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should be 18
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Old Jun 5, 2008, 12:46 PM
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how much would a stock turbo on an viii do.?
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Old Jun 5, 2008, 01:32 PM
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Depends on what mods you have.
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Old Jun 6, 2008, 02:15 AM
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Originally Posted by tunit
Depends on what mods you have.
Read?

Originally Posted by MRev
what is the maximum boost psi from the factory on a 2005 Evo VIII MR?
Should be 18, stock is like 1.3 to 1.4 bar, each bar is 14.7ish PSI.
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Old Jun 6, 2008, 04:10 AM
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Please search next time - you're giving the rest of us new guys a bad name.

https://www.evolutionm.net/forums/sh...d.php?t=317064
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Old Jun 6, 2008, 04:18 AM
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Originally Posted by Craig King
Please search next time - you're giving the rest of us new guys a bad name.

https://www.evolutionm.net/forums/sh...d.php?t=317064
its not really a big deal if you put it in the newbie forum... thats the whole point of ot. Now if you posted in evo general then prepare for people to make you feel like a little christian school girl who learned the hard way about her .
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Old May 8, 2010, 03:46 PM
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so i have a stock 06 evo 9 the gains in power are mostly by changing that taper doun to 14 . i want like 22 all the way. is it necessary to change head studs and rod bolts to run 22 psi on stock block???
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Old May 19, 2010, 11:16 PM
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I dont understand what you are saying about the boost taper. You want "like 22 all the way" ? Where did you come up with that number? I have an 8 with the 10.5 hotside, and I have been running 25 psi, tapering down to 20, for well over 100,000 miles on a stock block. So, no, it is not necessary. Do I WANT head studs? Sure do. -s
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Old May 20, 2010, 07:16 AM
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You'd be surprised how much power the stock head studs can take. Even at 30psi daily I have yet to lift the head. Seems the a real good way to make the head lift is get a bunch of knock going. I suppose there is some crazy cylinder pressure the head will lift at but I haven't reached it.

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