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| Dump Valve http://www.gt4dc.co.uk/forum/viewtopic.php?f=16&t=3304 |
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| Author: | NJ. [ Tue Nov 24, 2009 9:57 am ] |
| Post subject: | Dump Valve |
Fitted a dump valve to my st165, and now seems to idle badly! I have run the vacuum hose from the top of the dump valve to the nipple on the inlet manifold and the car seems to cut out due to the bad idle. when i dissconnect the vac hose it runs as normal, but then theres no dump valve function halp! 
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| Author: | two_OH_five [ Tue Nov 24, 2009 10:04 am ] |
| Post subject: | |
It sounds like the idle valve os dumping even when it's idling. This is a common issue with AFM based cars 
If the valve is adjustable you can try cranking up spring pressure to hold the valve shut. Also have a good nose aboit on www.gtfours.co.uk. There's a lot of how tos on there, moght just be one on fitting a dump valve to a 165. Kris and Loosey, the owners of that site are here too so may be able to offer more advise |
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| Author: | Meurz [ Tue Nov 24, 2009 7:59 pm ] |
| Post subject: | |
Try recirculating it back into the intake (after AFM, before turbo). It's a bit of hit and miss with the AFM as 205 said. |
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| Author: | Nibbles [ Tue Nov 24, 2009 9:05 pm ] |
| Post subject: | |
Many dump valves open a bit on idle, so air goes in through that as well as the AFM, giving a false airflow reading and messing up the fueling. As said, try tightening the spring pressure so it doesn't open at idle, although this will reduce the dump when needed. Alternatives are to recirculate the DV outlet back to the intake on the turbo side of the AFM (will lose the sound) or try another DV type. (not sure which ones stay closed at idle) |
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| Author: | mook [ Sun Dec 13, 2009 1:21 pm ] |
| Post subject: | |
A recirc would certainly do the job to cure the problem. As far as getting adjustable ones goes, I have a Blitz SSBOV with an adjuster. Would it up a bit and tried it without the vacuum pipe attached - managed to run up to 0.5 bar before it forced the spring open - so yes, there's dump valves out there that stay shut at idle. Hang on a mo though, just thought that the vacuum pipe will act against the spring when off boost, so it's not so clear cut. Don't know if there's sufficient vacuum at idle to overcome a 0.5 bar spring
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