We Test Synapse Engineering's Synchronic Blow Off Valve and DV Diverter Valve

We Test Synapse Engineering's Synchronic Blow Off Valve and DV Diverter Valve

By Mike Kojima

We have been friends with Synapse Engineering's chief engineer Peter Medina for a long time, since before he started the company and even before he had the ideas that launched its product line.  Many years ago Peter came up with an original twist for pneumatic controlled devices, a piston actuated control valve.  Not just any piston actuated control valve either, Peter's valve had an actuator piston with two substrates, basically two individual pistons coaxially divided on one piston head, basically a stepped piston.

We Test Synapse Engineering's Synchronic Blow Off Valve and DV Diverter Valve
The Synapse BOV is an impressive piece, machined from solid billet.  It looks good but we are not the types that want to impress with our BOV!  It works like no other though.  It is large, heavy and bulky but no more so than 90% of the BOV's on the market.

The advantage of this would be that the stepped piston would allow the user to tune the piston's active surface by adding pressure or vacuum feeding the small inner substrate, the bigger area outer substrate or both together.  By fiddling around with active piston area, the user could have a lot of adjustability over valve control force and speed.

We Test Synapse Engineering's Synchronic Blow Off Valve and DV Diverter Valve
You can see the twin vacuum/pressure chambers and the stepped piston in this cutaway rendering of the Synapse Synchronic BOV.

You might wonder why this is important and what this has to do with cars.  Shortly after Peter patented his stepped actuator design, he founded Synapse Engineering and built a line of fuel pressure regulators, wastegates, turbo compressor diverter valves and blow off valves using his stepped piston technology.

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Scott Helmer
Scott Helmerlink
Friday, January 14, 2011 3:43 AM
Most excellent article Mike! Out of curiosity, have you guys converged with Eric to test and see if it's worth the investment in one of these if you happen to have a Borg Warner EFR setup, what with the built in BOV? I'm curious because I'm looking into building a twinscroll EFR 7064/FMIC setup for my Impreza, which I'm hoping to make as compact as possible. I'm sure in the long run it'd probably be better to spend the $200-$250 extra bucks and get the DV since one day I'll be manning up and going the route of an SQ6 MAP setup (truly its siren song calls to me, though right now its hefty price tag does not), but it seems to me that those 200 some odd dollars could be going into my suspension; or better yet, my fuel tank.

What do you think?
Friday, January 14, 2011 4:38 AM
Very nice article! Two questions though. 1. Are these made in the USA (I'm assuming so, just wondering)? 2. Would it really be worth it to swap out my Tial Q BOV for one of these on my GT3071R Twin Scroll powered SR20DET (Tomei 260/12mm lift cams if that helps)?
Dusty Duster
Dusty Dusterlink
Friday, January 14, 2011 5:36 AM
Every car is allowed to have one ricer mod. Does an overly-loud BOV count as your ricer mod? :-P
Friday, January 14, 2011 7:37 AM
I've believed in the Synapse product from day one. I've still got my wastegate sitting in the box waiting to be installed on my project car and I would like to see some reviews on it.
Now that the DV is out, I think this will fit better than the previous hunk of metal they had before. The previous BOV was just too big for most of us to fit under a crowded turbocharged hood.
Great article. Can't wait to see what else you guys put this on to give readers a broader sense of its capabilities.
Friday, January 14, 2011 7:47 AM
Amazing is all I have to say that thing blows (pun intended) the comp. Wicked write up was long but WELL worth the read. I know a friend with an MR2 turbo that would be greatly helped with one of these the thing is so badly tuned it stalls left right and center....
Friday, January 14, 2011 8:23 AM
I may grab one for my 90 Alltrac Celica, I'm sick of the HKS SSQV... ha ha
Friday, January 14, 2011 8:43 AM
Interesting. I like how compact the DV is, and I really don't care about engine jewelry. I'm going to have to try one of these sometime soon..
Matt Dennison
Matt Dennisonlink
Friday, January 14, 2011 12:56 PM
I have the older larger version with the C-port blocked off... The metal IX BOV is suppose to hold boost relatively well until you go past the 23-24psi mark... I made the switch anyways to the Synchronic due to running more boost and was amazed by the before/after... Just from a switch from the metal IX BOV to this I picked up 30whp at 3,000rpm and untuned! All proven on the dyno... Pretty nuts...
Friday, January 14, 2011 2:23 PM
I'd like to see a real HKS SSQV taken apart beside a chinese copy
Dusty Duster
Dusty Dusterlink
Saturday, January 15, 2011 2:39 AM
@Garret: My real HKS SQV broke. I could take pictures of its guts.
Mike Kojima
Mike Kojimalink
Saturday, January 15, 2011 5:40 AM
The early ones were failure prone. They had plastic valves I think.
Dusty Duster
Dusty Dusterlink
Saturday, January 15, 2011 3:47 PM
Mine was a third generation HKS unit. It might still work. I think the problem is simply the low idle vacuum my car has.
Wednesday, January 19, 2011 3:02 AM
Props to you guys at MotoIQ and Synapse Engineering/Peter Medina for the properly designed DV (diverter valve?) version. That's what we like to see. You'll even sell more of the original because real performance fans will buy and recommend the DV and when their ricer friends ask for advice we can tell them to get the Synapse valve, and if they want to be ricey about it they can.
Wednesday, January 19, 2011 9:53 AM
I bit pricey for a Diverter valve ($225-280)... but maybe it's what my car needs...
Mike Kojima
Mike Kojimalink
Wednesday, January 19, 2011 7:09 PM
The more i drive it the more I like it and realize what a difference it makes, unbelievable. I thought a blow of valve was a blowoff valve until now.
Peter Medina
Peter Medinalink
Wednesday, January 19, 2011 9:21 PM
Mike- I could kick you, but you are letting my daughter borrow Krista's comer kart. Seriously though, I bug and hassle people I pay money to, but I'd rather have one of my friends give me the truth, good or bad, so thanks for the good feedback.

You know I'm NDA'd to death right now, but I just got off the dyno with the smoking gun data to support some of the butt dyno you're feeling. I'll share once the data is vetted.
Saturday, March 26, 2011 6:01 PM
I will be installing this on a friends EVO 8 and it looks like their 1.25" adapters are undersized. How did you guys overcome this on your EVO install? I am sure I could clamp it down although the 1.25" flange seems really undersized to match the OEM J pipe to the upper IC pipe. I will be contacting Synapse about this as it seems crazy they engineered something to be plug and play that appears not to be. Also the valve kit for EVO part # 16505A I received only came with one 1.25" adapter, not two as it should for a plug and play install. It appears this is messed up through the wholesale channel as I have a wholesale account with a major US distributer.
Mike Kojima
Mike Kojimalink
Sunday, March 27, 2011 7:43 AM
We just tightened the clamps up with no problems on ours. We had aftermarket charge pipes but they were compatible with the stock BOV. Yes it is supposed to come with two flanges.
Sunday, March 27, 2011 12:17 PM
I will post a picture on this one. The stock J pipe from the upper IC pipe to the BOV will be too large to just clamp down and not leak. I will post a picture when I can. Are you using a different J pipe from stock?
Mike Kojima
Mike Kojimalink
Sunday, March 27, 2011 1:30 PM
Yes but its compatible with the stock or DV BOV. I suggest you contact Synapse or your retailer directly as we cannot resolve this issue for you so its useless to post it here. I think you have the wrong adapter kit.
Saturday, May 14, 2011 6:32 AM
FYI Mike, from looking at the picture on page 6 and according to the instructions it looks like you are connected to Port A on the DV not Port B like you specified. I just installed one of these on the MS3 in the pull configuration using Port B only and it works great.
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