What causes fluttering?

Jayhawker · 03-24-2005, 09:31 AM

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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happasaiyan · 03-24-2005, 09:34 AM

hrm. when i got the aps dr500, i had bad flutter with the worx bov. then i switched to the stock bov...and it still fluttered...so then i got the aps bov, and no flutter.

maybe you have to adjust your bov? maybe its set a little too tight.

AaronWRX · 03-24-2005, 05:21 PM

too tight? you removed washers, or unscrewed the adjuster to fix your flutter?

happasaiyan · 03-24-2005, 05:25 PM

yeah, you can adjust the bolt and screw on the front. ive never adjusted it, but i know it can be.

AaronWRX · 03-24-2005, 09:48 PM

Wirelessly posted (blackberry: BlackBerry6280/3.7.1)

Ill give it a try. I always figured that the flutter was a result of not enough tension and that increasing it, would prevent the part thottle flutter.

AaronWRX · 03-24-2005, 09:54 PM

Wirelessly posted (blackberry: BlackBerry6280/3.7.1)

Ill give it a try. I always figured that the flutter was a result of not enough tension and that increasing it, would prevent the part thottle flutter.

AaronWRX · 03-24-2005, 09:55 PM

Wirelessly posted (blackberry: BlackBerry6280/3.7.1)

Ill give it a try. I always figured that the flutter was a result of not enough tension and that increasing it, would prevent the part thottle flutter.

AaronWRX · 03-24-2005, 09:56 PM

Wirelessly posted (blackberry: BlackBerry6280/3.7.1)

Ill give it a try. I always figured that the flutter was a result of not enough tension and that increasing it, would prevent the part thottle flutter.

whoosher · 03-25-2005, 12:59 AM

I had the flutter, aps 725 ,fp green , pe 850 and at the time a gfb stealth bov, changed out to an aps bov and no more flutter.

whoosher · 03-25-2005, 01:00 AM

Could be a leak in system

AaronWRX · 03-25-2005, 01:07 PM

Woa... I guess the "back" function of WAP.nasioc.com should be avoided. I had no idea it was re-posting.

03-24-2005, 09:31 AM	#1
Jayhawker Scooby Newbie Member#: 56964 Join Date: Mar 2004 Location: Mesa AZ Vehicle: 2004 STi Silver	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. Moderators, if this doesn't belong here, please move to correct forum. * Registered users of the site do not see these ads.

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03-24-2005, 09:34 AM	#2
happasaiyan Scooby Specialist Member#: 37731 Join Date: Jun 2003 Chapter/Region: MWSOC Location: Rolling Meadows, IL Vehicle: '07 TL-S 6MT '07 RDX-T	hrm. when i got the aps dr500, i had bad flutter with the worx bov. then i switched to the stock bov...and it still fluttered...so then i got the aps bov, and no flutter. maybe you have to adjust your bov? maybe its set a little too tight.

03-24-2005, 05:21 PM	#3
AaronWRX Scooby Specialist Member#: 7194 Join Date: Jun 2001 Chapter/Region: MAIC Location: NoVa Vehicle: 2011 997.2 Turbo Black	too tight? you removed washers, or unscrewed the adjuster to fix your flutter?

03-24-2005, 05:25 PM	#4
happasaiyan Scooby Specialist Member#: 37731 Join Date: Jun 2003 Chapter/Region: MWSOC Location: Rolling Meadows, IL Vehicle: '07 TL-S 6MT '07 RDX-T	yeah, you can adjust the bolt and screw on the front. ive never adjusted it, but i know it can be.

03-24-2005, 09:48 PM	#5
AaronWRX Scooby Specialist Member#: 7194 Join Date: Jun 2001 Chapter/Region: MAIC Location: NoVa Vehicle: 2011 997.2 Turbo Black	Wirelessly posted (blackberry: BlackBerry6280/3.7.1) Ill give it a try. I always figured that the flutter was a result of not enough tension and that increasing it, would prevent the part thottle flutter.

03-24-2005, 09:54 PM	#6
AaronWRX Scooby Specialist Member#: 7194 Join Date: Jun 2001 Chapter/Region: MAIC Location: NoVa Vehicle: 2011 997.2 Turbo Black	Wirelessly posted (blackberry: BlackBerry6280/3.7.1) Ill give it a try. I always figured that the flutter was a result of not enough tension and that increasing it, would prevent the part thottle flutter.

03-24-2005, 09:55 PM	#7
AaronWRX Scooby Specialist Member#: 7194 Join Date: Jun 2001 Chapter/Region: MAIC Location: NoVa Vehicle: 2011 997.2 Turbo Black	Wirelessly posted (blackberry: BlackBerry6280/3.7.1) Ill give it a try. I always figured that the flutter was a result of not enough tension and that increasing it, would prevent the part thottle flutter.

03-24-2005, 09:56 PM	#8
AaronWRX Scooby Specialist Member#: 7194 Join Date: Jun 2001 Chapter/Region: MAIC Location: NoVa Vehicle: 2011 997.2 Turbo Black	Wirelessly posted (blackberry: BlackBerry6280/3.7.1) Ill give it a try. I always figured that the flutter was a result of not enough tension and that increasing it, would prevent the part thottle flutter.

03-25-2005, 12:59 AM	#9
whoosher Scooby Newbie Member#: 69314 Join Date: Aug 2004	I had the flutter, aps 725 ,fp green , pe 850 and at the time a gfb stealth bov, changed out to an aps bov and no more flutter.

03-25-2005, 01:00 AM	#10
whoosher Scooby Newbie Member#: 69314 Join Date: Aug 2004	Could be a leak in system

03-25-2005, 01:07 PM	#11
AaronWRX Scooby Specialist Member#: 7194 Join Date: Jun 2001 Chapter/Region: MAIC Location: NoVa Vehicle: 2011 997.2 Turbo Black	Woa... I guess the "back" function of WAP.nasioc.com should be avoided. I had no idea it was re-posting.