FCD Question
08-13-03, 01:44 AM
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FCD Question
I have a FCD in my 1988 TII right now but it is not plugged in. I was wondering how to compensate for the fuel loss at higher boost. Is there any way I could tell the computer to use more gas? Also, when using the FCD, what is the boost set at? How do you change the boost? Thanks
08-13-03, 02:00 AM
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I'm a boost creep...
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For S4's the pressure sensor has very little input on fuel delivery. It mainly controls ignition timing. Using the FCD to boost pass the fuel cut point means the timing won't be retarded as boost increases further. This increases the chance of detonation.
Anything that reduces the chances of detonation makes FCD's safer to use. Make sure you keep intakes temps down (i.e. no unshielded pod filters).
Up to about 10psi you should be okay. Beyond that a fuel pump upgrade is mandatory, and you should be looking at improving intercooling.
The FCD has no control over boost. The S4's boost is regulated purely by the wastegate actuator. The easiest way to increase boost is simply to upgrade the exhaust and intake. Due to the undersized wastegate, keeping boost down is much harder than raising it.
Anything that reduces the chances of detonation makes FCD's safer to use. Make sure you keep intakes temps down (i.e. no unshielded pod filters).
Up to about 10psi you should be okay. Beyond that a fuel pump upgrade is mandatory, and you should be looking at improving intercooling.
The FCD has no control over boost. The S4's boost is regulated purely by the wastegate actuator. The easiest way to increase boost is simply to upgrade the exhaust and intake. Due to the undersized wastegate, keeping boost down is much harder than raising it.
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2nd Generation Specific (1986-1992)
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