I did a track day last tues and noticed my car felt a little sluggish. Had my tech check it out. He told me that the throttle was not openening all the way under hard acceleration. Has anyone with a supercharger come across this problem?

 

I have not had this problem but check diverter valve connections and valve for any leakage.

 

Thanks, I'll mention it to my tech. It's strange, if I'm downshifting say from 5th to 4th it seems to accelerate just fine, but when i'm shifting up from 3rd to 4th it feels sluggish.

 

recycle valve, stuck open? check all hoses for leaks... does it sound noisy in the cabin?

 

A scanner will quickly tell you if the throttle is opening all the way. What plugs and gap are you using? At what engine speed are you shifting from 3rd to 4th?

 

no noise in cabin, everything sounds normal.

 

Not sure what type of plugs I have. I was shifting at redline from 3rd to 4th. I believe my tech had the car hooked up to some kind of scanner when he noticed the throttle wasn't openening all the way. He also mentioned that if he floored the pedal from under 4000 rpm the throttle would open all the way.