[murray236]

hello, I installed a vortec v2 supercharger with an air to air intercooler and and svt fuel pump with 60 lb injectors in an 02 gt. The car works great under throttle but under light throttle it bucks and wants to serge forward at idle its fine again.. Any idea on what is the cause and what could I could do to stop this

Thanks in advance

[EthanDuce]

Maybe a new tune would help??

[hotshot]

Have you gotten a dyno tune or are you still running a canned tune?

[murray236]

I sent a programmable tuner to a tune shop and they put 3 tunes into it that they said would work for my set up. a light power tune, a medium power tune, and high power tune. I never did take it in to a dyno and have it set up at a shop as the nearest one to me would be 5 hours away. However I would make the trip to the city if I though that it would help. It will do this on the highway as well so maybe a tune would take care of it?

[nilrak]

Might not be a programming issue at all. Could be to do with your bypass setup. When the throttle plate is closed the excess bost has to have a release. If you have the bypass valve hooked up to a vacuum tap make sure it is a primary with full vacuum at closed throttle positon to ensure the valve is actuated.

[BlueStreak03]

+1 on the bypass train of thought. But definitely get the car to a dyno where the A/F ratio can be checked regardless of what the problem is.