Tuning/PCM/MAP/Boost - how does it work on this car?

[trackmeister]

Guys, how does the aftermarket tuning work on this car?

It is my understanding that if I use a small pulley I need a new tune so the car won't go lean under boost. This makes sense since the factory didn't map the PCM for higher than stock boost. What would happen if I bought a reflash tuner program and a 2.7" pulley but later put the stock pulley back on? Would the car still run fine with the stock pulley or would it be too rich everywhere? If the tuning is MAP sensor based and therefore boost-referrenced I would think it would run just fine, only without the big power gains of the small pulley.

Would an tuner reflash designed for a 2.7" pulley run fine with a 3.0" pulley?

Thanks :cheers

 

[freeflyer]

Simple answer, no. Tuning is MAF not MAP based.

 

[trackmeister]

Simple answer, no. Tuning is MAF not MAP based.

Then it should be fine. If the car is tuned by the MAF is is just looking at airflow so if it is tuned for a max of 16psi but I use a smaller pulley for 14psi the MAF voltage will be lower and the car should still be just fine at the lower boost.

 

[lthlvpr]

Keep in mind that most of the handheld tuning software can be adjusted back to stock with the push of a button.

 

[freeflyer]

Correct, sorry I assumed when you said smaller pulley you meant more boost.