have any of you had to run 2 bypass valves before. i have tried everything to get my bypass valve to stop fluttering at around 3,000 rpms with no avial. i have tried both the stock bosh unit and i also have a mini race. i have it located where everyone else has theirs.....about 2 feet from the throttle body. it started happening when i dropped to a 3.0 pulley. i was told by lideo of alterative auto that i may have to run 2 valves. one before my intercooler and the one i have now. this is not really a problem to do, but i have never really heard of others with this problem. anyone have any input on this?
two bypass valves?
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trinity_gt
10 Year Member
I don't see how an additional bypass would help. If the one is fluttering when boost gets to a certain level it will still do it when the boost gets to that level regardless of the presence of a second valve.
Are you running a standard Bosch type valve like this one:
If so, can you describe how it's connected? From where are you taking the vacuum reference? Which side sees boost pressure and which side is the discharge?
One more thing: If you are running that Bosch valve I can tell you it looks a lot like the stock diverter valve on my VW Golf GTI 1.8T winter beater/daily. A common upgrade on big- and even stock-turbo 1.8Ts is a Forge 007:
Forge Motorsport | Alloy Fabrication
I've got one on my 1.8T and it's a piston-type versus the Bosch diaphram. Mine came with selectable springs which is useful to minimize surge but hold boost. Might be worth looking into as an alternative to the Bosch one, if that's what you've got now...
Are you running a standard Bosch type valve like this one:
If so, can you describe how it's connected? From where are you taking the vacuum reference? Which side sees boost pressure and which side is the discharge?
One more thing: If you are running that Bosch valve I can tell you it looks a lot like the stock diverter valve on my VW Golf GTI 1.8T winter beater/daily. A common upgrade on big- and even stock-turbo 1.8Ts is a Forge 007:
Forge Motorsport | Alloy Fabrication
I've got one on my 1.8T and it's a piston-type versus the Bosch diaphram. Mine came with selectable springs which is useful to minimize surge but hold boost. Might be worth looking into as an alternative to the Bosch one, if that's what you've got now...
Night Shifter
Well-Known Member
is it fluttering under continuous driving or deceleration? mine flutters a little under deceleraction towards about 1500 or so... like it will release the pressure then it will get quiet then ill hear a little fluttering noise...mines not too lout though, but ive been in other cars that have fluttered too so i just ignore it..... my buddies did it in his turbod gto, then he got a better wastegate and it stopped...but that was also a turbo car, and yours isnt so idk...
cant you cut springs in bypass valves to help them release better under higher boost? or did i read that wrong?
and yeah, ive never heard of running 2 either
cant you cut springs in bypass valves to help them release better under higher boost? or did i read that wrong?
and yeah, ive never heard of running 2 either
