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Old 07-06-2003, 10:35 PM
doug294 doug294 is offline
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How much boost?
Hey I was just wondering what would be a safe boost level for a Si. I have intake, exhaust/gutted cat, mugen chip, and will be installing 450 cc injectors and a S-AFC. What should be a safe boost setting?
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Old 07-06-2003, 10:44 PM
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say about 5-7psi.
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Old 07-07-2003, 08:21 AM
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Re: How much boost?
Quote:
Originally posted by doug294
Hey I was just wondering what would be a safe boost level for a Si. I have intake, exhaust/gutted cat, mugen chip, and will be installing 450 cc injectors and a S-AFC. What should be a safe boost setting?

Well i'd say 7-9 lbs. Only if you upgraded your fuel pump. I would get a fuel regulator and fuel pressure gauge also. Its all about the air/fuel ratio. Get it tuned.
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Old 07-07-2003, 08:22 AM
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You might wanna get rid of the mugen chip ecu. I'm pretty sure its not the right set up for your turbo.
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Old 07-07-2003, 03:05 PM
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If you got an SAFC and 440cc injectors, your fuel management is probably good for about 9-10psi without having to upgrade anything. Since it's a stock engine and probably high mileage, I'd go 5-7psi on the street, and maybe 1-2psi higher for the track.
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Old 07-07-2003, 05:08 PM
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Why would the Mugen chip not be good for the turbo? It allows more fuel to be shot and no rev limiter/speed cutoff
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Old 07-07-2003, 07:14 PM
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the mugen chip advances your timing all to hell.
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Old 07-07-2003, 07:43 PM
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Maybe thats why my stupid check engine light keeps coming on
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