Bypassing the the bypass valve solenoid.
- Thread starter MPFab
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sx sonic
New member
My butt dyno is well calibrated. It can feel a flea sneeze from 20 yards away.
So how much horsepower is a fleas sneeze at that distance @ standard temp and density
opcorn:I am getting ready to give this a go and will probably be going with your method since it sounds easier and I don't want to be the first to break the fitting on the manifold that so many are complaining about.
Please bear with me, as I want to make sure that I am understanding everything correctly. In your method, we don't touch the third hose (black/green hose located towards the bottom center of the intake manifold correct) at all. Correct? At the same time, we also connect a hose from the BPV to the fitting on the vacuum connector that is closer to the passenger side of the manifold (the one by the alternator). Is there a difference between connecting the BPV to that fitting (passenger side of the manifold) vs the MPFAB method of connecting it to the fitting located on the bottom center of the manifold?
Apologies for my ignorance and thanks to everyone for helping to educate me on this issue.
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I am getting ready to give this a go and will probably be going with your method since it sounds easier and I don't want to be the first to break the fitting on the manifold that so many are complaining about.
In your method, we don't touch the third hose (black/green hose located towards the bottom center of the intake manifold correct) at all. Correct? At the same time, we also connect a hose from the BPV to the fitting on the vacuum connector that is closer to the passenger side of the manifold (the one by the alternator). Is there a difference between connecting the BPV to that fitting (passenger side of the manifold) vs the MPFAB method of connecting it to the fitting located on the bottom center of the manifold?
Apologies for my ignorance and thanks to everyone for helping to educate me on this issue.
His method and my method are the same with one caveat. My method uses the factory BPV line and his runs a new, separate line. Both methods hook up to the same ports and cap/plug the same ports.
There are two blk/grn hoses connected to the solenoid. The one you want to remove is on the passenger side of the intake manifold. It is about 2.5" long and goes from the intake manifold to the solenoid(This is the hose people are having a tough time removing). It is near the alternator. This is the hose described in both methods.
DO NOT touch the blk/grn hose that runs from the solenoid over to the vac. container under the center of the manifold. This is NOT the hose described in my method.
Please go back over the diagrams before attempting this. The car will not run correctly if the correct hoses aren't swapped.
Good luck!!
Did this mod by running a 1/8" rubber vacuum line from the intake manifold port to my Synapse BOV port B (the quickest responding port). Resulted in slight compressor stall/resonance in 4/5/6 gears due to the BOV not opening until 5 in/Hg of vacuum.
I believe this is due to the small engine's low intake vacuum ramp in higher gears. This leads me to believe the purpose of the solenoid is actually as a "vacuum amplifier" of sorts, in addition to nanny duties.
Just a heads up for other Synapse BOV users.
I believe this is due to the small engine's low intake vacuum ramp in higher gears. This leads me to believe the purpose of the solenoid is actually as a "vacuum amplifier" of sorts, in addition to nanny duties.
Just a heads up for other Synapse BOV users.
Preloader
The M32 Martyr
I too experienced compressor surge once, after this mod...... I'm using the forge BOV.
I'm running a custom aggressive tune from trifecta, though, and am at the boundaries of the comp map efficiency. The split second it takes for the vacuum to overcome the BOV seal when the throttle closed caused a boost spike that chirped the compressor.
No big deal, I just had to adjust my behavior and now I shift a little sooner.
I'm running a custom aggressive tune from trifecta, though, and am at the boundaries of the comp map efficiency. The split second it takes for the vacuum to overcome the BOV seal when the throttle closed caused a boost spike that chirped the compressor.
No big deal, I just had to adjust my behavior and now I shift a little sooner.
The fact that the BPV isn't getting a full boost signal(highest duty-cycle I logged was 60%) means that the BPV is not ever seated. This would make it impossible to induce compressor "chuffing" on throttle lift off because the system is never sealed. It would not have the typical pressure spike you see for a mil-sec once the throttle is shut with a normal BPV system.
Once you remove the solenoid from the loop you get 100% signal to the BPV meaning it is shut completely and sealing to the best of its ability. This new noise you guys are hearing is a good thing. It means the turbo is no longer having to work as hard to deliver the engines commanded torque while bleeding boost back into it own mouth.
Sorry, been watching "DEXTER" on Netflix lately...
Once you remove the solenoid from the loop you get 100% signal to the BPV meaning it is shut completely and sealing to the best of its ability. This new noise you guys are hearing is a good thing. It means the turbo is no longer having to work as hard to deliver the engines commanded torque while bleeding boost back into it own mouth.
Sorry, been watching "DEXTER" on Netflix lately...
sx sonic
New member
Pre have you found a compressor map for our turbo?!?
In other news I got a chance to do back to back runs today thanks to a warm spell (38$ :banana. 2 WOT runs from 900 RPM to redline with the BPV mod and two runs stock.
Get home to analyze my most accurate and variable free test of this mod and.............. My BPV mod was corrupted and unusable :blank face:. So back to square 1, results WILL be coming thou, just not today.
In other news I got a chance to do back to back runs today thanks to a warm spell (38$ :banana
. 2 WOT runs from 900 RPM to redline with the BPV mod and two runs stock. Get home to analyze my most accurate and variable free test of this mod and.............. My BPV mod was corrupted and unusable :blank face:. So back to square 1, results WILL be coming thou, just not today.