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Holding more boost at redline

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Old Feb 7, 2011, 07:47 PM
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Holding more boost at redline
Hey everyone. I have an Evo IX with all the bolt-ons, ported exhaust mani, o2, hotside, etc. My car holds 28psi till about 6k and drops to 21.5psi at 7k. Anyways I can hold more boost by redline?

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Old Feb 7, 2011, 07:48 PM
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ecu boost
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Old Feb 7, 2011, 07:48 PM
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What are you using for a BCS?
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Old Feb 7, 2011, 07:49 PM
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3 port boost solenoid & crushed MR BOV would help.
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Old Feb 7, 2011, 07:54 PM
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I have ECU boost with crushed BOV. The WGDC is at 100 by 6k rpm.
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Old Feb 7, 2011, 07:58 PM
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Originally Posted by xmaciek82x
I have ECU boost with crushed BOV. The WGDC is at 100 by 6k rpm.
The most my stock turbo ever held was 26 psi till redline and peak was 28..I had a blox mbc clone of the hallman and was better in terms of spool and the way it held when compared to the hallman funny thing was I paid $70 for it.
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Old Feb 7, 2011, 08:04 PM
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Originally Posted by achilles3000
The most my stock turbo ever held was 26 psi till redline and peak was 28..I had a blox mbc clone of the hallman and was better in terms of spool and the way it held when compared to the hallman funny thing was I paid $70 for it.
Stock wastegate actuator?
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Old Feb 7, 2011, 08:21 PM
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Originally Posted by xmaciek82x
Stock wastegate actuator?

Yes when I had my fp red held 31 psi till redline...Maybe try preloading it??Once I get retuned from a past tuner my car held boost like crazy.
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Old Feb 7, 2011, 08:32 PM
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Originally Posted by achilles3000
Yes when I had my fp red held 31 psi till redline...Maybe try preloading it??Once I get retuned from a past tuner my car held boost like crazy.

Yea. It,s preloaded. It won't go any more. Not sure what is going on then.
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Old Feb 7, 2011, 08:48 PM
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Checked for any boost leaks?

Also, the tune can be a factor on how you hold boost. (not the boost tune)
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Old Feb 7, 2011, 08:56 PM
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Originally Posted by xmaciek82x
Hey everyone. I have an Evo IX with all the bolt-ons, ported exhaust mani, o2, hotside, etc. My car holds 28psi...
Actually, you should feel blessed at being able to hold 28# with a IX turbo. the USDM IX turbo is the worst and most classical case of boost taper among the many 16G configurations that I am aware of.
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Old Feb 7, 2011, 09:26 PM
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Even if you got more boost up there the power wouldnt increase from the heat. 22 to 23 at 7500 is about it for HP
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Old Feb 7, 2011, 09:29 PM
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Originally Posted by C6C6CH3vo
Even if you got more boost up there the power wouldnt increase from the heat. 22 to 23 at 7500 is about it for HP

? makes no sense for this thread.
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Old Feb 7, 2011, 09:37 PM
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Originally Posted by achilles3000
? makes no sense for this thread.
Exceeding the efficiency of the turbo at redline, sounds pretty reasonable to me.
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Old Feb 7, 2011, 09:38 PM
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have you tried the help spring? there is a how to in the engine section...

https://www.evolutionm.net/forums/ev...pring-mod.html

and try the dejon tools mr bov stop leak trick

https://www.evolutionm.net/forums/ev...it-mr-bov.html

when i did these on my stocker i was well into 30psi.. gauge max.. and it never tapered back into range...

add a water/meth kit for cooling and upgraded intercooler and enjoy your new power...
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