DUMPVALVE

1. gafvts Saxperience Forum Bum Joined: Mar 2005 hull Posts: 2566 supercharged saxo vts

   #1 29th October 2005, 19:47

   just added dump valve to the car,sounds very nice,but when you let the car come down in gear you can hear it hissing away,is this normal on the supercharged cars,i did not expect it to sound the same as a turbo car so i thought that is why it does it
2. Scottp Administrator Joined: Dec 2002 Glasgow United Kingdom (Scotland) Posts: 26097 Chelski Traktor

   #2 29th October 2005, 20:06

   possibly because the super charger is still making some boost as it runs of the crank as the engine revs down?
3. gafvts Saxperience Forum Bum Joined: Mar 2005 hull Posts: 2566 supercharged saxo vts

   #3 29th October 2005, 20:17

   just as long as it is ok
4. Dan Saxperience Hardcore! Joined: Dec 2003 Middlesbrough United Kingdom (England) Posts: 23676 Seat Leon FR

   #4 30th October 2005, 16:28

   How much did that set you back craig? If you dont mind me asking?
5. Simop Administrator Joined: Dec 2002 Warrington Posts: 20561 Blue Saxo VTS Turbo/White Megane F1 R26

   #5 30th October 2005, 17:04

   Quote:

   Originally Posted by gafvts just added dump valve to the car,sounds very nice,but when you let the car come down in gear you can hear it hissing away,is this normal on the supercharged cars,i did not expect it to sound the same as a turbo car so i thought that is why it does it

   It's hissing as you are letting boost out of your charge pipes...
   
   The vacuum in the inlet manifold is opening up the dump valve. Your charger is still creating bosot as the engine is turning, so some of this boost is expelled through the dump valve.
   
   If youre happy with the sound, fair enough, but on a supercharger youre actually losing one of its benefits...
6. Awretham Frequent Poster Joined: Jun 2004 Surrey Posts: 801 200sx S13

   #6 30th October 2005, 21:31

   Yea was about to say the same, a DV on a s/c setup won't do you any favours.
   You'll only benefit from it with a turbo, even then its really only to reduce the strain on the commonents caused by the excess pressure (when the throttle is closed,) and the lag between gear changes due to compressor shaft stalling.
7. gafvts Saxperience Forum Bum Joined: Mar 2005 hull Posts: 2566 supercharged saxo vts

   #7 31st October 2005, 11:35

   took the dumpvalve off after 2 hours,started to do my head in,i would not recommend fitting dump valve to supercharged saxo.dan i got the dumpvalve given to me by my local garage cos i do some work there sometimes
8. Dan Saxperience Hardcore! Joined: Dec 2003 Middlesbrough United Kingdom (England) Posts: 23676 Seat Leon FR

   #8 31st October 2005, 16:21

   Did it affect the performance of the car at all?
9. gafvts Saxperience Forum Bum Joined: Mar 2005 hull Posts: 2566 supercharged saxo vts

   #9 4th November 2005, 19:34

   did not seem to effect performance of car dan
10. Mr_Hush Frequent Poster Joined: Mar 2005 Bridgend United Kingdom (Wales) Posts: 665

    #10 6th November 2005, 01:28

    what did it sound like? lol
11. gafvts Saxperience Forum Bum Joined: Mar 2005 hull Posts: 2566 supercharged saxo vts

    #11 6th November 2005, 14:21

    when not driving the car it sounded pretty much like a normal dumpvalve,but when driving it sounded crap