xr_velocity Donating Members 290 Member For: 18y 4m 1d Gender: Male Location: Sydney Posted 19/01/10 01:10 AM Share Posted 19/01/10 01:10 AM Hi everyone,I have recently had a Rapid V3 kit fitted and am not a big fan of the blow off valve noise now. I know it would be the same on other similar setups, so I am not singling out Rapid's kit. The kit itself has made a huge improvement to the responsiveness and drivability of the car.But for me, I am not really liking the wog noise coming out of my engine bay after throttle lift off. I was going to see if I could quieten it down a little, but had a question before starting....The noise that I now have when the throttle shuts and the blowoff valve opens, is it only coming from the blow off valve and back into the intake pipe for the turbo, or would it also be coming back through the turbo in the opposite direction to intake flow like a dose pipe would do?I was thinking of having the plumb back blow off valve go through a sort of muffler before heading back to the intake. But this would be useless if it is coming back through the turbo itself. Link to comment Share on other sites More sharing options...
ENVYOSXR Loves boost Donating Members 266 Member For: 15y 9m 2d Gender: Male Location: VIC Posted 19/01/10 04:16 AM Share Posted 19/01/10 04:16 AM (edited) Are you talking about the flutter sound or the actual BOV making the noise. As with the under battery pipes you get loud fluttering sounds when you back off the juice even with a BOV fitted. I had to cut the spring in the BOV to allow for more adjustement as it wasn't opening enough, in turn not letting out enough excess boost when backing off causing the flutter sound back though the turbo.If you put a big plumb back BOV in you should be able to get rid of most of the sound, I liked it at first but I am sick of people looking at me after I scare the sh*t out of them with a massive dose.I havn't been able to get rid of flutter completly but minimised it as much as possible.Hope this helps a bit Edited 19/01/10 04:19 AM by ENVYOSXR Link to comment Share on other sites More sharing options...
bjc Donating Members 2,823 Member For: 21y 5m 27d Gender: Male Location: Townsville Posted 19/01/10 05:27 AM Share Posted 19/01/10 05:27 AM I have the rapid kit also and the noise you get is coming from both the blow off valve and the turbo. I plumbed mine back to the intake with that huge pipe rapid gives you as it was to annoying listening to the sucking of the valve on vacuum. It has quietened the valve down but the turbo flutter noise on back off is still hell loud.As ENVYOSXR has said I'm not sure if a second valve or even a bigger valve would stop the flutter all together but I am personally sick of hearing the flutter and dont want to draw attention to the car so may go to a bigger aftermarket valve.Somebody else may be able to answer this? Link to comment Share on other sites More sharing options...
xr_velocity Donating Members 290 Member For: 18y 4m 1d Gender: Male Location: Sydney Posted 19/01/10 06:08 AM Author Share Posted 19/01/10 06:08 AM (edited) So the air is obviously being forced back out the turbo because the stock blow off valve can't release enough air...but then this would be the same volume of air if you are running the same boost with a normal airbox over the engine intake. The only difference being the far longer exit path to come back out into atmosphere through your air filter. I don't want to increase the length of my intake, so the next step would be to fit a bigger blow off valve...or a second blow off valve?My setup uses the plumb back into the under battery intake already.The loudness of the noise is quite annoying and attracts too much unwanted attention. Edited 19/01/10 06:10 AM by xr_velocity Link to comment Share on other sites More sharing options...
bjc Donating Members 2,823 Member For: 21y 5m 27d Gender: Male Location: Townsville Posted 19/01/10 06:24 AM Share Posted 19/01/10 06:24 AM It is annoying yes, it was fun and exciting at first but not now, I like the response it give the motor though The standard intake is basically like a muffler being so long that it keeps it quieter.I'm seeing Dave (blueboost) next week so will ask his opinions on this. Link to comment Share on other sites More sharing options...
xr_velocity Donating Members 290 Member For: 18y 4m 1d Gender: Male Location: Sydney Posted 19/01/10 08:49 PM Author Share Posted 19/01/10 08:49 PM Anyone else had any luck removing this noise? Does an after market blow off valve make any difference? Link to comment Share on other sites More sharing options...
xr_velocity Donating Members 290 Member For: 18y 4m 1d Gender: Male Location: Sydney Posted 19/01/10 09:09 PM Author Share Posted 19/01/10 09:09 PM It seems there is a blow off valve forum in here...I didn't realise...I'll read through there, I'm sure to find something. Link to comment Share on other sites More sharing options...
Panda Eyes flame magnet Gold Donating Members 5,674 Member For: 16y 9m 15d Gender: Male Location: adelaide hills- 'race air' central Posted 19/01/10 11:42 PM Share Posted 19/01/10 11:42 PM or you can go buy a na car. Link to comment Share on other sites More sharing options...
mattyb Donating Members 1,097 Member For: 16y 8m 17d Gender: Male Location: Gold Coast, QLD Posted 19/01/10 11:53 PM Share Posted 19/01/10 11:53 PM Go Fast Bits Make a BOV that is adjustable. it can be turned up lout to give a big 'Whoosh' and massive dose sound, or turned to 100% plumb back and it's silent. Food for thought. Link to comment Share on other sites More sharing options...
berzerker Donating Members 767 Member For: 17y 2m 10d Gender: Male Location: Brisbane Posted 20/01/10 01:19 AM Share Posted 20/01/10 01:19 AM Also after a fix for this noise.Im wondering whether a different size filter would make a difference, like the shorter mushroom looking pod filter that is half the height of the normal one, or this one: Link to comment Share on other sites More sharing options...
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