I went to change my BOV from Stock to the SYnapse BOV Version 2. Now When I was driving the car yesterday, I start to give it or more like stepped on the throttle, all of a sudden my service light went on and the ASC light came on as well and my idle was all over the place, car lost power and needed to pull over, Car went on limp mode. . Overboost?

So I shut off the car for 5 mins and started the car again and it was again running fine. Lights disappeared and everything.

Now do I need to adjust the BOV more tension or less tension? I was told less so counterclockwise..unless someone says otherwise....

Btw, Im tuned to a stock BOV. but I never seen anyone complaining abt the synapse bov even with out a tune.

Any inputs?


Thanks

 

I've been having some issues with mine causing compressor surge on my 8. It may be different for the Xs but when I talked to Synapse they told that the reason I'm getting compressor surge is because the stock BOVs are designed to leak a little under boost to prevent compressor surge. With that leak now gone fast spooling turbos such as the stock Evo turbos will try force more air into the engine than it can handle at a given RPM. I'm not sure if that makes sense but I guess what i'm really trying to say is that maybe your ECU thinks the turbo is spooling too fast now so it's going into limp mode to prevent overboosting and boost spikes.

 

How much boost were you tuned to on the stock bov? How much boost are you making now?

 

What happen is when you were tuned, they tuned your BOV for it leaking. My stocker leaks at 24psi. So if i want to push 28 psi, i have to increase the boost alot more since the BOV is leaking.

Now when you install a BOV that doesnt leak, you are not hitting 28 psi because the BOV is not leaking. You are hitting something much higher than 28 psi.

What you need to do is get the boost control retuned. It shouldnt be hard or require much work if you take it to a tuner that has a brain.

I see your from toronto. I live close to the Grove City Outlets in Pennslyvania and we get ALOT of people from Toronto to come shop. If you ever come down, hit me up.

 

Dang. What's with these newbies changing important parts (like a recir valve) without tuning!

 

My problem is if I dont down shift at high gear low rpm, I get a surge, Try lowering the boost until you get it tune!

 

Thats what is happening with my synapse dv too. I bought a softer spring from Mil Spec (Aby) and i hope it fixes the issue. I will let you know.

 

^ USPS claims it was delivered on 8/27. Please post your results.

First off, i run the smaller synapse valve on a 2.3L evo 8 on e85, w/hta-grn.

I love the valve, but the oem spring didnt work for me. Funny thing is, it does work for other people without issue.

So i tried several springs & found 1 that worked best for me. My bov now behaves like the oem metal bov, but is more responsive & holds a lot more boost due to the amazing synapse bov design.

My most bothersome issue was when in 5th gear & trying to merge on the fwy... anything over 6-10psi, the valve would just cycle.

i also had issues in 4th on fwy/street & also on the street in 3rd, same scenario.

oem spring = bov flutter with small throttle inputs above 6-10psi or so. Only way to avoid it was to floor the throttle....not something you want to do on a crwoded freeway.

new spring = mr bov like drivability on fp-blk, hta grn, e8 w/10.5, all on 2.3L, e85, s2 cammed motor.....3 differnt turbos, never made a bov adjustment

I have sold this spring to people on this forum & locally to owners of evo 8/9/X's who previously had issues like your describing. This spring solved their problems.

pm me if anyone is interested.

cost of the spring isnt much w/shipping, paypal, etc.

 

First let me say thank you Aby for the spring and detailed installation instructions (hehe). You definately made it idiot proof.

Before i installed the spring from Mil Spec, i was getting BOV flutter in every gear except for 1st if i was giving the car partial throttle and like Aby stated above it always happened right around 6-10 psi. The BOV flutter was so bad i could only take my car WOT or barely any gas at all. Anywhere between that (partial throttle), the BOV fluttered like crazy and it would cause to jerk really bad.

After i installed the new spring and washer, i tried it in push mode with port a hooked up. It was significantly better. The car only fluttered trying to go up an incline at partial throttle. I was happy with this much of an improvement but i decided to see what switching to port b in push mode would do (i did this yesterday). I have not had any kind of BOV flutter since i switched to port b. The BOV is actually working like it is suppose to and it works better than the stock BOV. I will write a little something up comparing the springs and a review on it tomorrow probably on the "other" forum.

Thanks Aby!

 

That is awesome news!

I am also running in push mode - B port @ +2 turns of preload. I have beenin this config for ~4 months & have run this config on 3 different turbos without issue or the need to make a bov adjustment!

I have plenty of these springs ready to go, for those who r interested.

Chad, sorry i didnt get a chance to send you one, as i had to visit my ill uncle....lymphoma is back & doing him in

 

Shoot me a pm with the price of this magical synapse spring shipped to 29707. Thanks!

 

Yes. Please pM me your shipped price to 35120.
I did have to cut a bit off my spring to make it work the way I like it.
Thanks

 

^ pm'd you both.

These can ship out tomorrow.

aby