I have a S5 with stock turbo and ported motor. I have 860cc injectors for secondaries, fd fuel pump, 3 inch exhaust and fuel cut defender. Also have an apexi S-AFC to control it all.

Was living in chicago for school and came home for the weekend car pulled like it was low 13 second car, even raced a 13 second talon to prove it.

Anyways came home to show the buddies and didn't pull as hard anymore. Not sure what happend and i am running out of ideas. Checked timing, also had a walbro fuel pump in it to see if that was it, changed plugs, always run premium and have an Air/Fuel gauge to help with mixture.

Any ideas or suggestions on what i could try would be helpful.

 

do you suppose you are running too rich?

 

No, my guage is where its always been. Ive tried leaner ive also tried going richer. Nothing seems to really help. Any other ideas here guys?

 

Are you boosting any different? Maybe the wastegate arm is getting stuck open.