olly elworthy 0 Posted October 6, 2003 hi ya ive seen on a few sites that its worthwhile fitting a check valve,/ non return valve before the idle stabiliser on a g 60, i was wondering,, cant you just use a non return valve like what goes onto the brake servo on the cars from the inlet mainifold for the idle stabiliser rather than spend £50 on a speacialist check valve for this application?!?! ideas folks? :?: :?: :?: Quote Share this post Link to post Share on other sites
h100vw 0 Posted October 6, 2003 Prolly do the same job but the pipes are much larger in diameter on the by pass. Have a look at http://www.snstuning.com I think they have a write up on a DIY check valve on there. Gavin Quote Share this post Link to post Share on other sites
olly elworthy 0 Posted October 6, 2003 cheers for replying, these check valves look like a good idea, got one on your car? Quote Share this post Link to post Share on other sites
G60Jet 1 Posted October 6, 2003 the check valve is a valve that closes as the boost pressure rises, basically it a ball bearing in a metal tube that seals when the pressure pushes it up against one end o the tube. Quote Share this post Link to post Share on other sites
olly elworthy 0 Posted October 6, 2003 IS THIS SAFE THOUGH AS I THOUGHT THE ISV WAS SUPPOSED TO DUMP BOOST IF IT REACHES TO HIGHER LEVEL, IS IT BEST TO INSTALL A CHECK VALVE OR RE ROUTE THE ISV? Quote Share this post Link to post Share on other sites
h100vw 0 Posted October 6, 2003 The dumping pressure myth is still doing the rounds? Sam at SNS has been everywhere in the code and not found anything to do with it. How much boost is unsafe?? ( Check out http://www.vwvortex.com and do a search on it for ISV see what comes up) I have a check valve on my Golf and noticed no change in 'go'. ISV not leaking anyway? I have a 68mm pulley as well and have seen 1.2 BAR of boost on the gauge. Folk in the States run turbo G60s to 20+ PSI. To get that kind of boost from G60 would take a tiny pulley and some high revving. Along with frequent rebuilds... The idea of the check valve, is to maintain std levels of boost, by preventing blowby if the ISV is worn. If you think a check valve could be bad, you could always fit a new ISV. :shock: I have run my G60 for over 2 years without incident. Well nowt that can be put down to the check valve. I reckon it's safe as houses. I bet there are tons of folk on here that have them and no one has a bad experience. My 2p. Gavin Quote Share this post Link to post Share on other sites
g60pops 0 Posted October 9, 2003 There is one on ebay at the moment. Quote Share this post Link to post Share on other sites
exturbo2003 0 Posted October 9, 2003 The dumping pressure myth is still doing the rounds? Sam at SNS has been everywhere in the code and not found anything to do with it. How much boost is unsafe?? ( Check out http://www.vwvortex.com and do a search on it for ISV see what comes up) Gavin there is no electronic dumping only that the isv will only hold back a certain pressure before it blows past, and as the isv wears so the boost level it can withstand will be lower. this is when a check valve is a good idea Quote Share this post Link to post Share on other sites
