S4 / RS4 (B5 Platform) Discussion Discussion forum for the B5 Audi S4 & RS4 produced from 1998-2002

is there a difference between blow off valves and diverter valves ?

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Old 12-06-2001, 05:38 PM
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is there a difference between blow off valves and diverter valves ?
Old 12-06-2001, 05:40 PM
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Default BPV's help with the turbos. BOV's make more noise, but can make the car run more lean(m)

It can cause the MAF to take a dive. That's about all I know.
Old 12-06-2001, 05:42 PM
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Default Would run rich...

MAF wouldn't necessarily go but ECU might go into "limp" mode, especially if you are running rich at idle.
Old 12-06-2001, 05:46 PM
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Yeah that too... :-)
Old 12-07-2001, 03:44 AM
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Default They have a place on some cars just not on ours. The way I understand it the BPVs re-circulate the

air while the Blow offs release it to make sure the back pressure doesn't spin down the turbos. Oh yeah, and the chick go crazy for the "tsshhhhhhhhhhhhh" ; ) But if I had a WRX, I'd probably have one.

-st
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