Volvo Owners Club Forum - View Single Post - D5 (D5244T to 2005) - Turbo governor

Jardon · Sep 25th, 2013, 20:23

I've had this fitted for a while now and just thought I'd raise the possible non-issue of whooshing/dump valve noises coming from the TGV. Mine starts to whoosh at ~1600 rpm and stops at ~2100 rpm. There is no more noise up to the redline (valve pretty much open - low vac). As the revs fall the whoosh happens again as the rpms cross that 2100 rpm threshold (valve closing to create high vac) . I had got into my head that this was bad but if the valve is going to bleed vac to atmosphere it has to make a noise - and the valve is very active between those points. So isn't whooshing to be expected? Just thinking out loud - my car goes well so I couldn't get my head around the bad "dump valve" sound until I gave it a bit more thought and watched a few of Mikes vac videos.

Sep 25th, 2013, 20:23	#29
Jardon Junior Member Last Online: Sep 21st, 2018 04:18 Join Date: Jan 2009 Location: Swansea	I've had this fitted for a while now and just thought I'd raise the possible non-issue of whooshing/dump valve noises coming from the TGV. Mine starts to whoosh at ~1600 rpm and stops at ~2100 rpm. There is no more noise up to the redline (valve pretty much open - low vac). As the revs fall the whoosh happens again as the rpms cross that 2100 rpm threshold (valve closing to create high vac) . I had got into my head that this was bad but if the valve is going to bleed vac to atmosphere it has to make a noise - and the valve is very active between those points. So isn't whooshing to be expected? Just thinking out loud - my car goes well so I couldn't get my head around the bad "dump valve" sound until I gave it a bit more thought and watched a few of Mikes vac videos. __________________ 2005 V70 D5 SE Premium 130000 miles. 320mm front plod T5 brakes. Currently trying it out with the EGR blanked. Diesel isn't so bad after all!