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Old 07-31-10, 03:47 PM
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Boost

I just bought a 89 turbo and was wondering how i can increase the boost to 8 psi from 5psi?
thanks
Old 08-01-10, 10:30 AM
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A boost controller.

Or upgrade the exhaust.

At 8 PSI, you will require an FCD to prevent the ECU cutting fuel at 8.6 PSI.

You are also going to want an aftermarket boost gauge and some way of measuring A/F ratios (wideband is easiest). After around 8 PSI, you will need to start adding fuel.
Old 08-07-10, 03:48 PM
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i have a wideband that shows AF too and bigger injectors and a APEXI power FC if that is the same thing as FCD
Old 08-08-10, 12:47 PM
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The PowerFC replaces the stock ECU and thus eliminates fuel cut. It seems like you are in good shape. You can use a boost controller to raise the boost and then tune the car for higher boost.
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