Need some help boost issues! - Subaru WRX Forum
 
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post #1 of 6 Old 06-10-2008, 11:54 AM Thread Starter
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Question Need some help boost issues!


SO i just got my wrx a few days ago but it came with a bar gauge which i didnt know how to read, so i put a psi one on and i realized i was running about 7-8lbs of boost, so i took the car to my friends shop and they maxed out the boost controller and it only hit 10-11, they then removed the pin completely from inside the boost controller and the car runs 15-16 from 1st to 3rd and sometimes 17-18 on 4th gear the car does have a fuel pressure regulator and a turbo timer but was never tuned. my question is why was the MBC (turbo xs) restricting and is that much boost dangerous?

Last edited by wrxshotta; 06-10-2008 at 12:59 PM. Reason: forgot to mention
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post #2 of 6 Old 06-10-2008, 12:48 PM
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When you run an aftermarket BC you setup the way the boost is controlled differently than the factory. this is called a "fast response" setup as opposed to the factory "bleed" type setup. The fast response setup eliminates the need for the restrictor pill as your controller can better handle factory and higher boost.

Simply put:

factory bcs - not great at holding boost so it needs the assistance of the restrictor pill

aftermarket BC or ebcs (should always tune with these) - Can hold higher boost levels on its own without the assistance of the restrictor pill

Edit - is your car tuned for your mods?

Mike
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post #3 of 6 Old 06-10-2008, 01:23 PM Thread Starter
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Originally Posted by Longshot View Post
When you run an aftermarket BC you setup the way the boost is controlled differently than the factory. this is called a "fast response" setup as opposed to the factory "bleed" type setup. The fast response setup eliminates the need for the restrictor pill as your controller can better handle factory and higher boost.

Simply put:

factory bcs - not great at holding boost so it needs the assistance of the restrictor pill

aftermarket BC or ebcs (should always tune with these) - Can hold higher boost levels on its own without the assistance of the restrictor pill

Edit - is your car tuned for your mods?
thanks alot but in the time being will my engine be fine at those boost levels with the FPR?
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post #4 of 6 Old 06-10-2008, 01:40 PM
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No , Since Its Not Tuned You Could Hurt The Engine........remove It And Put It Back To Stock.
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post #5 of 6 Old 06-10-2008, 02:05 PM
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Hopefully Ron (dumdum) or someone else who knows can chime in about the aftermarket FPR as I am not as knowledgable about it. Also, sorry I see you were not tuned as you stated in your first post which I missed.

Your boost will jump around without a tune and with the turbo xs so until you get a tune, I'd remove the MBC and put the factory stock setup back on. If not you'll keep spiking and could possibly blow the turbo or your engine if it continues.

Mike
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post #6 of 6 Old 06-10-2008, 03:43 PM
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Quote:
Originally Posted by wrxshotta View Post
thanks alot but in the time being will my engine be fine at those boost levels with the FPR?
Your kidding yourself if you think an adjustable FPR is an alternative to getting some engine management.Doesn't work like that.Your well on your way to buying a new engine especially if that FPR is set lower than is should be.Her ya go,lotsa reading:

Unabomber's Manifesto - NASIOC

Homebrewed tuned with Opensource!
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