Post 318721 by mightywolf on 2010-07-03 21:22:04
ok I've got a 98' S70R (auto). It has a dump valve fitted on the pipe near the throttle body at the front of the car. From the dump valve the little pipe comes off to a t-piece. One end of the T pipes to the boost gauge and the other pipe off the T goes to the upper manifold (small nipple directly below another small nipple just next to/under the throttle body.
Now it dumps fine but I noticed today that on the turbo a nipple was showing with nothing on it. I've sussed out that a pipe should go from that nipple on the turbo to the nipple on the manifold where the dump valve now feeds in to? I think.
So the million dollar question is what is the nipple on the turbo? Is it the top of the re-circ valve? If so I know I need to take off the re-circ valve and blank it, but would capping that nipple off be ok in the meantime?
The car boosts at a good 9psi at full welly, but it also hisses from the moment you start accelerating. It sounds like the dump valve, but could it be the re-circ valve? All hoses seem fine with no evidence of any leaks anywhere. Sorry if thats a bit confusing.
Cheers,
Mark.
Post 318724 by claymore on 2010-07-03 21:25:24
Your right, it is the recirc valve, you might get away with putting a short length of pipe on it and putting a one way valve on there.
Post 318751 by mightywolf on 2010-07-03 22:54:52
so could that be the hissing I'm getting? and what would capping it off do?
Post 318853 by mightywolf on 2010-07-04 17:08:08
will it lower the possible performance leaving the re-circ on?
Post 318866 by brett craig on 2010-07-04 18:01:15
needs either capping or blanking, blanking is the correct method
Post 318898 by mightywolf on 2010-07-04 19:25:39
ok so next question is, if I take the dump valve off (I ain't bothered about it) was size is the intercooler hose its connected to and where could i get another hose?
Post 318912 by brett craig on 2010-07-04 20:10:43
depends which pipe you have cut into, is it the silicone pipe that has a branch coming off it or is it the hard pipe that runs from the turbo to the throttle body ?
Post 318916 by p fandango on 2010-07-04 20:34:47
its best to put the dump valve as close to the throttle body as possible
Post 318920 by Torch S70R on 2010-07-04 20:46:00
speak to fraz m8, the recirc already has a blanking sheet inbetween it and the turbo housing thats why there's no hose on it :)
Post 318922 by brett craig on 2010-07-04 20:49:36
that'll be problem solved then lol
Post 319112 by mightywolf on 2010-07-05 19:06:27
[quote=Torch S70R;318920]speak to fraz m8, the recirc already has a blanking sheet inbetween it and the turbo housing thats why there's no hose on it :)[/quote]
ah nice one cheers :)