port a and port b each go to separate isolated chambers. no way for air to flow between a and b. do you have it installed in push mode?

 

I'm running 38lbs port b in pull mode and it's almost perfect. I came from a Forge also. The only way to get the Synapse to flutter so far is uphill part throttle trying to maintain like someone else stated, otherwise it's perfect.

 

^any preload, im trying to figure out if and how much i need

 

I tried 3 turnes of preload without much difference. Synapse, any input on my issue on boost loss? Im going to hook up A + B again just to confirm that is the cause.

 

^ I would pull the bov apart (~3 minutes) & be sure the o-rings are fine & that the spring is properly sitting on the adjuster foot.

I know with my springs, they are a bit smaller in diameter, so on a few occassions, the spring would wind itself up the adjusting foot = reduced boost level.

so i now include a large diameter washer to sit between the spring & adjusting foot to eliminate this issue.

 

I pulled it apart and checked it out and everything looked fine. I also hooked up the A+B port and im still boosting at about 24psi instead of 28. I switched it back to push as well and same results. I was convinced it was valve related because right after i went to the B-port only I was driving along side another X and went WOT. I had capped the A line and the cap popped off under full load and my boost dropped to 10psi (It was temporary) so then i hooked up a direct line and im still only boosting to the mentioned 24psi.

Anyone know of someone that can do a pressure test in the cleveland/akron, oh area?

 

just got my DV today!!!
about to go install it right now...i just got my fittings on with teflon tape and got evo flanges installed...

im trying to decide which way to install it...most likely gonna follow how the stock dv is installed with only one port connected.

 

im back to report great news!

installed my Synapse DV exactly like the stocker is setup...using only port B connected and port A is open to vta...
awesome response. tiniest to no flutter (when im trying to make it flutter)...

also i did NOT touch the pre-load! This is right out of the box, using the nickel plated fittings.

this DV is awesome! Sounds great. Seems to be holding 1000x better than my Crushed X DV! Synapse rocks! I'll be posting a new thread with pics and more good words later.

-tim85851

 

So far so good on with my Synapse DV...I am using the Tial flange with my Synapse DV, as I used to have a Tial Q bov on the car. I did use the Tial O-ring instead of the smaller Synapse O-ring. I purchased the below hose barbs. I have the DV in pull mode with port B going to the intake manifold and port A vta...Driveability is awesome so far, I don't think I have felt flutter once...I should hopefully be tuning the car this weekend depending on the weather...Ill let everything know how it holds up with 27psi+ on my BBK-B...

http://shop.ebay.com/i.html?_kw=bspt...F8%22&_kw=hose

 

I am running the RV in pull mode with port B hooked up to Intake Manifold and no preload. It works great but I get a lot of flutter in higher gears (4th and 5th) and (slightly more than) partial throttle, medium rpms (3-5k). It starts venting like crazy and robs the car of a lot of power.

I was considering changing to A+B port in push mode and driving on it for a while to see how it flutters.

How does preload adjustment affect flutter.

 

I've been using the Synapse DV with the TiAL flange for about 1 week in push mode. In my experience, running Port B alone was much much better than running A+B together. I have left the preload setting alone form the factory, but I did check it and it seems to be fully counter-clock.

In comparing to my Tial QR, I think this valve has much better crivability as far as partial throttle is concerned. The only reason I swapped was because of partial throttle bucking on the road course, which really upsets my car. Having read through the review on MotoIQ, I really believe what they mentioned was what I was experiencing...as my HKS turbo build boost during partial throttle modulation. The TiAL QR was perfect prior to my road course experience. I didn't have any flutter with it, but it definitely wasn't working well for part throttle. With the Synapse in my current configuration, it seems partial throttle on high was improved, and the car doesn't buck as I hold the throttle still after passing someone.

I will be trying out the pull configuration soon. I hope this fixes my issue, or I will have to get rid of the stupid MAF and switch to SD. Overall, I think running port B alone, regardless of push or pull, is the best on the Evo.

 

Thank you for all of the feedback. I'm sorry, we haven't been very active on the boards lately. We've been buried on some R&D that has us all pre-occupied.

Please let us know if you're having a hard time finding product, or getting adapter flanges. We've been going through the Tial adapter flanges faster than anticipated, but can direct you to the right place that will have it in stock.

 

Do you sell the 1/8th npt back cap separately without the boost connect fittings? My kit didn't come with the brass barbs and I can't find low profile 1/8th bspt fittings anywhere. The boost connect doesn't fit evo boost nipple, so I had to rig a piece of hose ziptied over the boost connect tubing. I love my DV but I hate running it with this boost connect crap, especially running 35psi.

You guys need to make a hose nipple adapter to plug into the Y fitting, so we can use normal hose. IMO the barbs should be included with the kit since it's advertised in the picture for the kits.

 

You guys looking for NPT fittings should check out FASTENAL.

 

I definitely suggest trying out pull mode. As I posted above...I am using the Tial flange too with the DV in pull mode using port B only...factory preload too...only time I've had any flutter is going up hill in 5th or 6th at low RPMS...The hill I went up I usually go up in 3rd gear...So unless I'm trying to make it flutter it won't do it...


Completely forgot about Fastenal. The closest one to my house is like 45mins+. I just ordered mine from some UK ebay dealer. Took a week to get here...