Tuning for a smaller Pulley Boost?

My car has already been tuned, with the current setup with the 4.38 pulley, I am wanting to go to a 4.25 pulley which should give me an additional 2 lbs boost.

What tables do I have to change. I know airflow and fuel, I am not going to do this until I am confident, but for information purposes. Thanks Chris

Mysetup is a 2002 procharged c5 A4

bump for advice info Thanks.

Mainly just fuel and timing.

It may need more fuel because of more boost or it may still be okay. You'll just have to see what your wideband o2 sensor is saying. It may require that you pull a degree or two of spark or it may be just fine with the same spark.

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Originally Posted by 5FDP

Mainly just fuel and timing.

It may need more fuel because of more boost or it may still be okay. You'll just have to see what your wideband o2 sensor is saying. It may require that you pull a degree or two of spark or it may be just fine with the same spark.

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OK Thanks I wasnt sure I am going from a 4.38 to 4.25 Thanks