My bypass valve is, uh.. Not bypassing
#1
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My bypass valve is, uh.. Not bypassing
Took the miata out for the first time under boost today. Pulls nice, but my bypass valve isnt relieving the pressure from the charge pipes. Its a 1g DSM (uncrushed) bypass valve, and I ran the signal line after the TB. I thought maby it was because it was after the throttle plate, but I looked at a friends setup and his was after the throttle plate too.. The valve itself is installed correctly so I dont know why it isnt opening. Any ideas? The valve itself isnt seized, I played with it quite a bit before installing it.
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I will try to get some pics tomorrow night, but i'll be swapping in a new mitsu bypass valve as well to see if it was just a bad BPV. I don't think it is the setup but this is my first boosted car so i'm bound to make some mistakes that I wont realize right away. I have the valve installed about 6" after the compressor outlet, and recirculated about 6" before the compressor inlet, after the MAF. I have the flanged end of the BPV on the pressure side (compressor outlet), and the tubed end going back into the intake. Appears to be the same way that its installed on DSMs.
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Uploaded pics to my VBgarage, I put a line on the flange just to give reference since the pic is pretty dark. The other pic is just showing that I have it going to the manifold.
https://www.miataturbo.net/forums/vb...o=view&id=2536
https://www.miataturbo.net/forums/vb...o=view&id=2536
#9
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To be honest, i'm not sure and I think that may be a good possibility. I swapped in a new 2g DSM bpv, and I dont notice much difference. I am open down pipe, so I probobly just cant hear it.. Plus now that I think of it, I didnt hear any compressor surge, then again im sure I wouldnt hear it over the exhaust anyways. Maby I just went alittle over board with the turbo size itself hah.
#11
To be honest, i'm not sure and I think that may be a good possibility. I swapped in a new 2g DSM bpv, and I dont notice much difference. I am open down pipe, so I probobly just cant hear it.. Plus now that I think of it, I didnt hear any compressor surge, then again im sure I wouldnt hear it over the exhaust anyways. Maby I just went alittle over board with the turbo size itself hah.
You should be able to hear the 1g over the open dp at part throttle when letting off boost. Compressor surge too.
You can remove the recirc pipe as well temporarily (you will run rich at idle, car will want to die) but once you get moving it should run fine, just to hear it more clearly if you can't at part throttle.
It's a decent low cost BOV (can find them < 20$), just it would be nice if it didn't leak air at idle (which is a non issue with a MAP based system like MS.)
Hope that helps.
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I put the 2g on just to see if it made a difference, it wont be staying on. Won't the idle leak with the 1g not cause any ill effects since its being recirced back into my intake post MAF? I think i'm going to vent the 1g for a trip around the block to see if i'm just being an idiot or if it really isnt opening.
#13
I put the 2g on just to see if it made a difference, it wont be staying on. Won't the idle leak with the 1g not cause any ill effects since its being recirced back into my intake post MAF? I think i'm going to vent the 1g for a trip around the block to see if i'm just being an idiot or if it really isnt opening.
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How does it cause issues though? I mean all of the metered air is staying in the system, so I didnt think it would be a biggie. BTW you can mod the 1g to stay closed at idle, i just dont have the drive to do so at the moment lol. I may buy my friends Greddy RS and recirc that for now.
#16
How does it cause issues though? I mean all of the metered air is staying in the system, so I didnt think it would be a biggie. BTW you can mod the 1g to stay closed at idle, i just dont have the drive to do so at the moment lol. I may buy my friends Greddy RS and recirc that for now.
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