Synapse BOV
Good info thanks brotha..! I actually couldnt wait any longer to get info from Synapse so I played with the spring adj. and turned it in 4 and a half turns. It helped a little but I still get partial-throttle flutter, just not as bad. I'll remove the A-port and see what the dealeo is...
as for everone else. If your BOV came capped as shown leave it as is...!
as for the other people that bought the older version you'll have to connect the C-port to a boost source...
as for everone else. If your BOV came capped as shown leave it as is...!
as for the other people that bought the older version you'll have to connect the C-port to a boost source...
yo o-town, thats how all of the newer DV will be setup coming out of Synapse (according to Pete).
Back in Mar I took mine in to have them look at it, check on some flutter/ surge I was experiencing and one of the first things they did was to modify the "C" port (plugging it) and porting the chamber enternally, and in my case i had some serious Comp surge! (I had the FPRed w/o 80mm house/surge port). Since going with the Juiced FP Red w/80mm house absolutley NO comp surge!!! but i had experienced some minor flutter. Talked with Pete and he recommended connecting "B" only ... No issues!
They actually dont recommend messing with the spring adjustment, adjust by switching the port combination until it is resolved, if not then go to the spring for adjustment. This is without a doubt the best DV/BOV out there!
but the newer Valves will have no "C" port or it will be capped!
Oh yea (I hope I'm not misquoting), using only the "A" port is like using 60% of the surface area with in the chamber and port "B" is like 30-40%, with both "A&B" it would equate to 100%
Back in Mar I took mine in to have them look at it, check on some flutter/ surge I was experiencing and one of the first things they did was to modify the "C" port (plugging it) and porting the chamber enternally, and in my case i had some serious Comp surge! (I had the FPRed w/o 80mm house/surge port). Since going with the Juiced FP Red w/80mm house absolutley NO comp surge!!! but i had experienced some minor flutter. Talked with Pete and he recommended connecting "B" only ... No issues!
They actually dont recommend messing with the spring adjustment, adjust by switching the port combination until it is resolved, if not then go to the spring for adjustment. This is without a doubt the best DV/BOV out there!
but the newer Valves will have no "C" port or it will be capped!
Oh yea (I hope I'm not misquoting), using only the "A" port is like using 60% of the surface area with in the chamber and port "B" is like 30-40%, with both "A&B" it would equate to 100%
I just installed mine with all the ports used and normal driving is great. I need a new clutch now so I havent had a chance to test part throttle boost. So far I like it but wont know for sure untill I get new clutch installed.
How does your Synchronic bov sound? Mine sounds like, for the lack of a better description, an angry turkey and rubbery (if that makes any sense). Definitely not like a firecracker as someone else described.
Does this sound normal?
Does this sound normal?
I had a evo 9 bov that was crushed. Normal driving it sounds the same. If I hit full boost and let off its noticably louder. My boost went up so I had to turn my boost controller down. I went to the track and made 4 passes and now my clutch is slipping. So far its way better than the hks bov that I had a couple years back. Its also better than the crushed evo 9 bov that I had.
Just got off the phone with Synapse and with the newer version (c-port capped from factory), you will have to play with the A and B ports to fine tune the BOV and leave the preload as is...
hope the info helps...
Happy boosting...!
hope the info helps...
Happy boosting...!
yup..! thanks homey... 
I just got back from fine tuning mine and I left the A-port connected and the B-port disconnected. Seemed to solve ALL the partial throttle flutter I experienced before the change...
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The C-port is no longer connected into on the NEW evo version BOV, as the C-port chamber is slightly modified, per Synapse representative.
I just got back from fine tuning mine and I left the A-port connected and the B-port disconnected. Seemed to solve ALL the partial throttle flutter I experienced before the change...
---------------------
The C-port is no longer connected into on the NEW evo version BOV, as the C-port chamber is slightly modified, per Synapse representative.
UPDATE:11/9
spoke to a Synapse rep when I called about the flutter I have today.
Well from the rep that I spoke to he said to leave the preload alone and either connect to the A or B port and let the other port open/vented to atmosphere.
I opted for connecting to the A-port only and leave the B-port open. Magically it solved the fluttering issue I had at partial throttle. Problem solved...!
Nope...
I now have the BOV prematurely open slightly when I gradually climb up from vacuum to full boost in 5th gear. This happens when Im in low RPM's in 5th and push the gas pedal 100% down. When I reach full boost it starts to creep open slighly or open and close quickly...
Any suggestions...?
spoke to a Synapse rep when I called about the flutter I have today.
Well from the rep that I spoke to he said to leave the preload alone and either connect to the A or B port and let the other port open/vented to atmosphere.
I opted for connecting to the A-port only and leave the B-port open. Magically it solved the fluttering issue I had at partial throttle. Problem solved...!
Nope...
I now have the BOV prematurely open slightly when I gradually climb up from vacuum to full boost in 5th gear. This happens when Im in low RPM's in 5th and push the gas pedal 100% down. When I reach full boost it starts to creep open slighly or open and close quickly...
Any suggestions...?
UPDATE:11/9
spoke to a Synapse rep when I called about the flutter I have today.
Well from the rep that I spoke to he said to leave the preload alone and either connect to the A or B port and let the other port open/vented to atmosphere.
I opted for connecting to the A-port only and leave the B-port open. Magically it solved the fluttering issue I had at partial throttle. Problem solved...!
Nope...
I now have the BOV prematurely open slightly when I gradually climb up from vacuum to full boost in 5th gear. This happens when Im in low RPM's in 5th and push the gas pedal 100% down. When I reach full boost it starts to creep open slighly or open and close quickly...
Any suggestions...?
spoke to a Synapse rep when I called about the flutter I have today.
Well from the rep that I spoke to he said to leave the preload alone and either connect to the A or B port and let the other port open/vented to atmosphere.
I opted for connecting to the A-port only and leave the B-port open. Magically it solved the fluttering issue I had at partial throttle. Problem solved...!
Nope...
I now have the BOV prematurely open slightly when I gradually climb up from vacuum to full boost in 5th gear. This happens when Im in low RPM's in 5th and push the gas pedal 100% down. When I reach full boost it starts to creep open slighly or open and close quickly...
Any suggestions...?
Hmmm...So far I've tried A (vacuum) +C (boost), then B (vacuum)+C (boost). Next I'm going to try A+B (vacuum)+C (boost), after I pick up some hoes...er hoses.
We'll see if that flutter gets resoved.
We'll see if that flutter gets resoved.
here is mine installed. I have A, B, and C hooked up... I need to read this thread and figure out what I should hook up. I'll have to play with it 
Last edited by R/TErnie; Nov 9, 2009 at 10:58 PM. Reason: forgot the pictures!
