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Old 03-24-2005, 10:31 AM   #1
Scooby Newbie
Member#: 56964
Join Date: Mar 2004
Location: Mesa AZ
2004 STi

Default What causes fluttering?

I am just wondering if anyone here knows what causes flutter. My major mods are the APS cai, sr55, dr725 and 3" tbe w/cat delete, along with all supporting mods (injectors, fuel pump, ECUTek). The fluttering started after the dr725 was installed. At partial throttle in 4th, 5th or 6th, while maintaining a speed, the car flutters very bad and the whole car shakes. I had the WORX bov and had a few people tell me that was the reason. I changed it to an APS bov and it still flutters badly. I plan on taking it back to my tuner (DynoComp) probably next week but I just wanted to know if anyone else was experiencing this. Thanks in advance for any input. This is on an 04 STi.

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