cheap bosch bov replacement
#62
It's a decent whoosh right now, but I can hear some faint compressor surge still (definitely not BOV fluttering). That said, there is still a bit of adjustment to be made, lubricating the BOV piston, and switching from a 3/4" bung to a 1" bung (stupid old 323GTX valve was 3/4" opening), hopefully getting a better blow-off.
#63
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Are you getting surge or is the BOV cycling open/closed?
Most BOVs in miatas don't get enough vac signal to open properly or stay open at the end of the blow event. IM ports are too small.
Most BOVs in miatas don't get enough vac signal to open properly or stay open at the end of the blow event. IM ports are too small.
#64
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ryrye- compressing the spring (permanently) would be the same as the adjustment screw, so if you're out of adjustment, I say yes. I'd avoid the torch on a little spring. I'm still amazed that the weakest spring is producing that much tension. Did you guys get three springs? (I did)
I'm running a 1" bung for the bov.
I'm running a 1" bung for the bov.
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oh it is most definitely compressor surge as i relocated my bov to just after the IC so its right in the mouth of the car, but I hear this sound coming from right in front of me (out of the intake piping. I am just sort of surpised that my temporary ABS piping hasnt blown off lol. Even with the slightest of spooling, I get this slight snickering sound and when I spool it up for real, it gobbles like a turkey and people look at me funny. If your wondering what vac port I am using, it is the one that the Charcoal canister used while it was still in the car
#66
oh it is most definitely compressor surge as i relocated my bov to just after the IC so its right in the mouth of the car, but I hear this sound coming from right in front of me (out of the intake piping. I am just sort of surpised that my temporary ABS piping hasnt blown off lol. Even with the slightest of spooling, I get this slight snickering sound and when I spool it up for real, it gobbles like a turkey and people look at me funny. If your wondering what vac port I am using, it is the one that the Charcoal canister used while it was still in the car
-Mike
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I just gave up on this damn piston style POS. I tried everything to make the thing blow off and it just would not. Basically the design is **** and its never going to work right. It sucks to be limited again to 11-12psi again ( not blowing off gave me a nice steady 14-15psi to redline) but at least it isnt gobbling anymore :(
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I wonder if it's just the lack of qc on the piece or if yours was different mechanically - I know ben said his was different.
When I installed this bov my boost peak went to over 17psi from a peak of 14psi on the bosch. With the bosch I couldn't get anything to higher to hold with the MBC. It would just shoot up and immediately fall back down accompanied by a loud whistling sound. This was the more expensive "metal" bosch - but I'm sure there's some tolerance in quality and tension among those units too.
When I installed this bov my boost peak went to over 17psi from a peak of 14psi on the bosch. With the bosch I couldn't get anything to higher to hold with the MBC. It would just shoot up and immediately fall back down accompanied by a loud whistling sound. This was the more expensive "metal" bosch - but I'm sure there's some tolerance in quality and tension among those units too.
#78
I just put the red non recirc BOV in from this thread. Got the gobbling at first but then loosened the spring tension on the spring that was installed (got two) and now it's blow off fine. That's at 11 psi. Shouldn't be a problem to go hight as I should be able to tighten it a bit if need be. I'll probably pump 15 psi through the system and see if it leaks.
Frank
Frank
#79
Sorry to bring this back from the dead, but I just got around to installing my turbo setup with VTA BOV people here have been having problems with, and sure enough, I too am having compressor surge.
Is it ok for the BOV to leak at idle? Also, did anyone figure out the best way to fix this, like try new o-rings, different springs, etc? Or did the people with the bad ones just buy the same one M2Cupcar had that can be used for recirculation? Thanks!
Is it ok for the BOV to leak at idle? Also, did anyone figure out the best way to fix this, like try new o-rings, different springs, etc? Or did the people with the bad ones just buy the same one M2Cupcar had that can be used for recirculation? Thanks!