Blow Off Valves

John Ret. · 05-17-2006, 02:45 PM

I know you either love them or hate them, and I don't particularly wish to know which one, but.....

...Does the B5 2.7TT engine/ecu have any trouble with vent to atmosphere BOVs?

Thanks!

B5AUDIS4 · 05-18-2006, 02:12 PM

Yes, they do have problems with your typical BOV. But, if you use an adjustable combo valve...you can get the sound...with the boost pressure you need. I've heard the HKS SSQV valves are good. I've got EVO MS ones right now....I wanna switch. Not enough sound. lol

**AllWheelGrip** · 05-18-2006, 02:52 PM

i do not recommend BOV

Quote:

The Audi turbo system is a closed loop system by which all unused boost that is spooled during off throttle and gear shifts must be re-routed within the system; it cannot be vented to the atmosphere due to the dependence on the MAF and ECU to properly read and interpret air flow dynamics within the intake tract. Therefore BOV's (Blow-Off Valves) are not used because they create a rich air/fuel condition (i.e. less air to fuel ratio) which will damage the catalytic converter, create soot on the exhaust pipes, and cause occasional misfiring (due to the purged air) which will result in ECU miscalculated timing adjustments and other errors.

**T-sport** · 05-20-2006, 03:42 AM

Cheers for that technical info AllWheelGrip.I was going to get one fitted on mine as i like the sound and people know its a turbo coming down the road but now you have told me that i think i wont.

**mandoh** · 05-20-2006, 02:21 PM

how about intake systems, u can hear the turbo spool out of that, u don't need a BOV to hear a turbo.

05-20-2006, 03:42 AM	#4 (permalink)
T-sport Super Moderator Join Date: Sep 2005 Location: Devon,uk Posts: 1,505 Gallery: (0)	Cheers for that technical info AllWheelGrip.I was going to get one fitted on mine as i like the sound and people know its a turbo coming down the road but now you have told me that i think i wont. __________________ 2002 1.8 T Avant 18" TT Quattro Replicas Forge Motorsport DV

05-20-2006, 02:21 PM	#5 (permalink)
mandoh Moderator Join Date: Jun 2005 Location: New Jersey Posts: 491 Gallery: (0)	how about intake systems, u can hear the turbo spool out of that, u don't need a BOV to hear a turbo. __________________ Its Better To Lead Than To Follow!!!! 1998 Audi A4 2.8l 30valve=SOLD mods-2.75in. milltek cat/bac exhaust,power adder short-ram intake,Giac ecu flash(awetunning),5%tint rear half,blacked out halo headlights 2007 WR Blue Subaru Wrx Sti mods- 3in.catless T/B exhaust,(invidia g200 cat-bac,v2catless D/P),COBB AP tune on 93oct,18x8.5 gunmetal work emotion cr's,blacked out headlights

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05-17-2006, 02:45 PM	#1 (permalink)
John Ret. Newbie Join Date: May 2006 Posts: 6 Gallery: (0)	I know you either love them or hate them, and I don't particularly wish to know which one, but..... ...Does the B5 2.7TT engine/ecu have any trouble with vent to atmosphere BOVs? Thanks!

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05-18-2006, 02:12 PM	#2 (permalink)
B5AUDIS4 Senior Join Date: Mar 2005 Location: Beaverton, Or Posts: 170 Gallery: (0)	Yes, they do have problems with your typical BOV. But, if you use an adjustable combo valve...you can get the sound...with the boost pressure you need. I've heard the HKS SSQV valves are good. I've got EVO MS ones right now....I wanna switch. Not enough sound. lol

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