took the car out with the D1 and BRRV for the first time... - 2003-04 Mach 1 Registry Owners Club

DSG2003Mach1 · 05-23-2013, 10:29 PM

holy crap that bypass valve is loud! I got the recirculating unit but its just vented to atmosphere right now.

Im gonna post a video tomorrow night but I feel like something might be wrong...I have verified that the bypass is open at idle (although I did not try to look to see if it was COMPLETELY open at idle) but its annoying as hell at part throttle under a slight load. When I start the car you get a loud...howl...I guess you could call that it dies off. Same thing when Im driving it, gently accelerating (its not tuned so Im babying it) around 1500rpms its like it howls, if I get up around 2000rpm or so it drops off, or if I back off the throttle a little it dies down after a second or two (also goes away if I upshift and dont try to accelerate any more).

is this normal with the recirculating bypass? The rushing air sounds would be fine but the howling is obnoxious! Seems like like maybe it does it if the valve is only partially closing at some throttle conditions

edit - boost gauge is not installed yet so its making it more difficult to know wtf is going on...may try to install the aeroforce gauges monday

Saltyweasel · 05-24-2013, 07:43 PM

Yes, they are ridiculously loud.

05-23-2013, 10:29 PM	#1
DSG2003Mach1 700 HP Mach Join Date: Nov 2003 Location: Orlando, FL Posts: 8,384	took the car out with the D1 and BRRV for the first time... holy crap that bypass valve is loud! I got the recirculating unit but its just vented to atmosphere right now. Im gonna post a video tomorrow night but I feel like something might be wrong...I have verified that the bypass is open at idle (although I did not try to look to see if it was COMPLETELY open at idle) but its annoying as hell at part throttle under a slight load. When I start the car you get a loud...howl...I guess you could call that it dies off. Same thing when Im driving it, gently accelerating (its not tuned so Im babying it) around 1500rpms its like it howls, if I get up around 2000rpm or so it drops off, or if I back off the throttle a little it dies down after a second or two (also goes away if I upshift and dont try to accelerate any more). is this normal with the recirculating bypass? The rushing air sounds would be fine but the howling is obnoxious! Seems like like maybe it does it if the valve is only partially closing at some throttle conditions edit - boost gauge is not installed yet so its making it more difficult to know wtf is going on...may try to install the aeroforce gauges monday __________________ 03 dsg mach1 - MPR built 9.5:1 motor, D1, cams, ported intake, full exhaust, magnum t56, built rear, E85 etc... '12 F150 FX2 Supercrew with Ecoboost daily beater

05-24-2013, 07:43 PM	#2
Saltyweasel Registered User Join Date: Feb 2012 Location: WI Posts: 104	Re: took the car out with the D1 and BRRV for the first time... Yes, they are ridiculously loud. __________________ 2004 Mach 1 Azure Blue Built 5.0L stroker P1SC w/ supporting mods Promotion 3650 with McLeod RXT clutch/flywheel 31 spline rear end w/ 3.73's JBA shorty headers, Magnaflow catted x-pipe, Borla Stingers

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