Thread: Fuel enrichment
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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Agree with the above.

I would not run a true 1 bar without an intercooler upgrade.

Which K27?

For some the first simple effort at more fuel is usually resetting base CO up to 3.5%. This can also help throttle response off idle.

Second simple effort might be to shim the fuel pressure reg on the Fuel Distributor to raise System Pressure.

Both these can be done with a wide band or on a dyno.

Next is some way to lower Control Pressure as controlled by the WUR. (Andial Fueler dose this.)

The Andial has for the most part been replaced with the Adjustable WUR along with an boost-clamp (rpm switch and solenoid) that delays enrichment for the most part. Almost dose the same thing except a little better in that it dose not have as much potential for the to rich mid rpm section that came with the Andial.

After that it gets more involved and going to a Fuel Distributor that is modified for more fuel from: CISFLOWTECH However, this takes some effort to master.

Another possibility is active boost control by RPM that can taper boost when the fueling system ceiling is reached. This has the potental for a bigger mid range power.

Condition of the CIS (ballance), the efficency of your turbo, intercooler and ignition settings in part determins what you can get away with on AFR's. In my non expert opinion at TQ peak you probably do not want to be any leaner than 11.5. At HP peak should probably not be over 12/1. At red line on boosted 930's many will find they are running close to 13/1. This is often livable on a street car though probably less than desirable.

There are a lot of good threads on this here if you want to look further into it.

Last edited by 911st; 08-21-2010 at 06:13 PM..
Old 08-21-2010, 06:09 PM
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