random spudder...

[boachenizer]

I recently started to autocross my car and Ive found that under hard acceleration between 3500 and 4000 RPM's the car starts to studder like its hitting the rev limiter but its clearly not. Ive put new injectors and opted for the larger 17lb injectors in and the car also has a chip and an intake. It seems like its getting too much air or too much fuel? any ideas?

[SpecM]

misfire?

[slo325i]

Can you just drop in bigger injectors w/o tune??

[jlevie]

Do you see the problem in street driving? If not, the cause may be from rust in the fuel tank.

A layer of rust in the bottom of the tank may not cause problems when driving on the street. But throw the car around a track and the sediment will be stirred up and clog the pump's inlet screen and cause fuel starvation under high load. To check of this condition, pull the pump & level sensor (on the passenger side) and use a stick to stir the bottom of the tank. If there's a layer of sediment you'll feel it. The fix for this is a replacement tank, or acid cleaning and sealing the tank.

[RedDotRacer]

airflow meter? My car did the same thing and that was the problem.

[boachenizer]

great thanks... ill try those out