My DR750 surge fix using a Synapse synchronic diverter valve - 3000GT/Stealth International Message Center
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Old 07-08-2019, 02:13 PM   #1 (permalink)
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Default My DR750 surge fix using a Synapse synchronic diverter valve

Like many other DR750 users before me (and other variants of larger TD04 turbos) I've had some serious problems with surging during acceleration at low RPM's in high gears and also some bucking problems when coming off the throttle under similar conditions.

Several years ago I purchased a Synapse synchronic diverter valve based on the feedback regarding these issues from the EVO forums. This valve has a multitude of ways in which you can configure it and for the first years I had it installed in push mode and used both nipples. In that configuration it was much better than my previous Forge BOV in but still not surge free in any way.

The trick is to get the valve to react quickly enough to dump air at low RPM and low boost before surge happens while at the same time stay closed during high boost.

After a recent race weekend where I spent 16 hours driving the car to and from the event I got fed up with the surge while cruising on the highway and decided to do something about it.

So during the past week I tried 7 different configurations of the Synapse synchronic and to my big surprise found a completely surge free configuration.

What worked for me was using the the valve in pull mode with the weaker of the two springs and only using the A port for vacuum/boost reference.

It feels really great to be able to accelerate at high gears and low RPM on the highway again without constantly having to watch out for surge and having to downshift to get into a higher RPM range. So I thought I'd share this configuration with any other 3/S owners fighting the same issue.

Here is a photo of my setup in the car and diagram of the valve itself.
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My DR750 surge fix using a Synapse synchronic diverter valve-img_20190708_194506.jpg   My DR750 surge fix using a Synapse synchronic diverter valve-bov1.png  
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Old 07-08-2019, 03:46 PM   #2 (permalink)
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Default Re: My DR750 surge fix using a Synapse synchronic diverter valve

Thanks for the info
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Old 07-08-2019, 06:11 PM   #3 (permalink)
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Default Re: My DR750 surge fix using a Synapse synchronic diverter valve

great write up robert
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Old 07-09-2019, 02:05 AM   #4 (permalink)
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Default Re: My DR750 surge fix using a Synapse synchronic diverter valve

Nicely done!
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Old 07-09-2019, 02:39 AM   #5 (permalink)
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Default Re: My DR750 surge fix using a Synapse synchronic diverter valve

Dude, thank you very much.... II just got my dr 750, which I have to instal...but Surge is what I am worried about. I went on their page, but there are numerious kits. Which one did you choose?
What about how to connect it, are there any instructions or what...?
Thanks man again for this information.
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Old 07-09-2019, 05:58 AM   #6 (permalink)
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Default Re: My DR750 surge fix using a Synapse synchronic diverter valve

They don't have a 3/S specific kit so I used their Evo kit and made a short aluminum pipe that goes between the intake bubble and the valve itself. Apart from that the install is very straight forward.

This is the kit I bought: http://synapseengineering.com/synaps...ic-dv-kit.html

I've attached some pictures of how I installed it on my car.
Attached Thumbnails
My DR750 surge fix using a Synapse synchronic diverter valve-img_20160707_193825.jpg   My DR750 surge fix using a Synapse synchronic diverter valve-img_20140907_153850.jpg   My DR750 surge fix using a Synapse synchronic diverter valve-img_20140907_133656.jpg  
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Old 07-09-2019, 06:00 AM   #7 (permalink)
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Default Re: My DR750 surge fix using a Synapse synchronic diverter valve

It should be noted that I mounted the valve right on the Y-pipe instead of the in the stock location. This might not work for those of you that still have the battery in the stock location.
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Old 07-25-2019, 03:28 PM   #8 (permalink)
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Default Re: My DR750 surge fix using a Synapse synchronic diverter valve

Man this is great news! im running the DR650s and have this issue very bad. I made my own balance tube and it did not alleviate the problem. I am on speed density right now so I would be running open atmosphere. im wondering if I could run Synapses BOV rather than the DV in the same configuration that you have your system setup.
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Old 07-26-2019, 05:41 AM   #9 (permalink)
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Default Re: My DR750 surge fix using a Synapse synchronic diverter valve

I think this should work just as well for non recirculating setups but as I'm running a draw through setup I'm unable to test it properly as the dumped air makes the ECU very unhappy.
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Old 07-26-2019, 08:28 AM   #10 (permalink)
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Default Re: My DR750 surge fix using a Synapse synchronic diverter valve

Quote:
Originally Posted by Unlogic View Post
I think this should work just as well for non recirculating setups but as I'm running a draw through setup I'm unable to test it properly as the dumped air makes the ECU very unhappy.
Yes I am on speed density. I am going to order the DV and vent it to atmosphere. I believe it should function fine theoretically. But the surging I am getting is awful. I cant stand it any more. I pray this fixes it. if not I still have Jeff Davis anti surge kit he developed I can put on but id like to try this first since its much less invasive to install.

Thank you much for the writeup man! Ill keep you updated if it alleviates my problem.
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