2001blackaudiS4

When I frist got GIAC Pump program installed, My car ran fine. Cutting it short,I then installed the giace race program and started running 100 octane, about a month or so after, I started to notice my car is running slugish when I race, Low RPMs. After I would race, in the rear of the car, towards the gas tank, I noticed a humming sound(as if something was cooling off). I talked to a few people, Some said the Issue would be my spark Plugs.


Also, While I'd be driving normally, the Gas needle would go down at an un-normal pace. While the car is Idle, the needle would jump back up.

Any Advice on better spark plugs to run 100 Octane Race Fuel, Or Any other ideas on what could be wrong other than Spark plugs would be greatly appreaciated.

quickaudi:STFA

humming sound at rear of car = fuel pump. test and replace.

2001blackaudiS4

Thanks. Do you think i should replace my sparkplugs with stock ones or are there aftermarket ones better for 100 octane

quickaudi:STFA

one range cooler with the amount of boost chipped cars run never hurts.

ChucktownS4

2nd and ngk or coppers -1