Synapse Engineering releases the Synchronic DV for Evolution
Oct 7, 2010 | 05:10 PM
#31
Hello Eric - I did the mathematical modeling on both SB & DV- Peter
B>A
Although you would factor this into most any other actuator design, this does not apply to the Synchronic geometry.
On the SB design, whether or not there was a port C all came down to the mathematical effect of Port C on actuation times at any pressure. Although DV doesn't look like it has a chambered port C, it has a "mathematical" Port C that is calculated into the design. It works so well that the DV can actuate in the abscence of vacuum in a controlled test where a traditional actuator will not. Yes, there is a spring in both SB & DV, but a mere 1 psi of spring pre-load would be enough to keep it shut 30 psi, in pull or push.
I will post some charts later that show the difference between SB & DV. SB is a much more purpose built design than DV. To ease any worries, just know that even though DV is a bit slower than SB, DV is still faster than anything in the aftermarket & in many cases OE . . .
David,
Thanks for the thorough explanation. I'm already very familiar with the function of DVs. I was simply curious as to what the area of actuation of A+B was in regards to the valve seat itself. You answered that (A+B=valve seat, so the spring preload is the difference).
Thanks,
Eric
Thanks for the thorough explanation. I'm already very familiar with the function of DVs. I was simply curious as to what the area of actuation of A+B was in regards to the valve seat itself. You answered that (A+B=valve seat, so the spring preload is the difference).
Thanks,
Eric
Although you would factor this into most any other actuator design, this does not apply to the Synchronic geometry.
On the SB design, whether or not there was a port C all came down to the mathematical effect of Port C on actuation times at any pressure. Although DV doesn't look like it has a chambered port C, it has a "mathematical" Port C that is calculated into the design. It works so well that the DV can actuate in the abscence of vacuum in a controlled test where a traditional actuator will not. Yes, there is a spring in both SB & DV, but a mere 1 psi of spring pre-load would be enough to keep it shut 30 psi, in pull or push.
I will post some charts later that show the difference between SB & DV. SB is a much more purpose built design than DV. To ease any worries, just know that even though DV is a bit slower than SB, DV is still faster than anything in the aftermarket & in many cases OE . . .
Oct 7, 2010 | 05:36 PM
#32
Peter, thanks for the reply. A couple questions/comments if you don't mind.
Thanks. that information helps as well.
I 100% agree that port C on the SB or any DV will help actuation times, but I have always used a DV with a 'port C' to account for the potential pressure differential from the UICP to the IM in the conditions that I mentioned previously. It's definitely a phenomena that does happen in turbocharged cars. My whole point was that if the DV is installed in 'pull' configuration, then there is no 'port C', physically or mathematically. That's what I was simply trying to clear up and why I asked these questions on the design.
By the way, your designs are the best on the market by far and why I bought the SB in the first place. Previous to this, years ago on my DSM, I ran the Greddy type-S that had a 'port C' as well. This helped in actuation as you mentioned, as well as accounting for the pressure differential that I mention.
However, the Greddy Type-S was a diaphram based design, which was lacking, since the diaphram could tear. But the overall design was very nice, with the adjustable spring, and the port C.
When your SB came out, it blew everything out of the water (in my opinion) in terms of engineering and function of a DV. Multiple area ports at the top, a 'port C', no diaphram, etc. The only downside for me was the sheer size and now that I will be moving to California, I'm most likely going to the DV, but just wanted to get the facts straight first.
Yes, that should be the case where A+B is equal to or greater than the valve seat area and why I asked that. Thanks for the clarification.
Great! Thanks again.
Eric
Thanks. that information helps as well.
By the way, your designs are the best on the market by far and why I bought the SB in the first place. Previous to this, years ago on my DSM, I ran the Greddy type-S that had a 'port C' as well. This helped in actuation as you mentioned, as well as accounting for the pressure differential that I mention.
However, the Greddy Type-S was a diaphram based design, which was lacking, since the diaphram could tear. But the overall design was very nice, with the adjustable spring, and the port C.
When your SB came out, it blew everything out of the water (in my opinion) in terms of engineering and function of a DV. Multiple area ports at the top, a 'port C', no diaphram, etc. The only downside for me was the sheer size and now that I will be moving to California, I'm most likely going to the DV, but just wanted to get the facts straight first.
I will post some charts later that show the difference between SB & DV. SB is a much more purpose built design than DV. To ease any worries, just know that even though DV is a bit slower than SB, DV is still faster than anything in the aftermarket & in many cases OE . . .
Eric
Last edited by l2r99gst; Oct 7, 2010 at 05:39 PM.
Oct 10, 2010 | 09:50 PM
#33
1. What is the spring pressure set to by default?
2. What are the minimum and maximum pressures if adjusted all the way tight/loose?
Oct 19, 2010 | 11:03 AM
#34
Installed in it as "push" and with B port only and wow. I can hear the valve working where there is "pressure differential" but that's it. It no longer effects the drivability.
Very happy with this BOV.
Very happy with this BOV.
Oct 19, 2010 | 12:13 PM
#36
I currently have a Forge DV and get what I describe as an awful 'bucking' under certain conditions - most common is going up a hill, with mild throttle, vacuum to boost (0 to 10 psi). I have been told this is 'common' but never happened with the stock DV. Will the new Synapse DV solve this issue ? Thanks
PS - I am in socal and would be happy to test the product
PS - I am in socal and would be happy to test the product
Oct 19, 2010 | 01:35 PM
#37
Oct 21, 2010 | 02:04 PM
#41
Former Sponsor
Joined: Jun 2008
Posts: 32
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From: San Diego
bump...
No Limit Motorsport has the DV in stock now. Visit this thread if you want to pick one up.
https://www.evolutionm.net/forums/ev...iart-2-0t.html
No Limit Motorsport has the DV in stock now. Visit this thread if you want to pick one up.
https://www.evolutionm.net/forums/ev...iart-2-0t.html
Jan 24, 2011 | 06:23 AM
#43
David / et al from Synapse - I currently have a Forge DV and when I am going up a hill, with part throttle, I get a REALLY bad bucking scenario. My only solution is to either let off the throttle, downshift and keep the RPMs > 4500, or go WOT. On flat surfaces, I very rarely, if ever, have this bucking scenario.
My questions are : (1) what is causing this (feels like the DV is opening when it shouldn't) and (2) will your SB or DV cure this / eliminate this issue ?
My questions are : (1) what is causing this (feels like the DV is opening when it shouldn't) and (2) will your SB or DV cure this / eliminate this issue ?
Jan 24, 2011 | 08:37 AM
#44
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David / et al from Synapse - I currently have a Forge DV and when I am going up a hill, with part throttle, I get a REALLY bad bucking scenario. My only solution is to either let off the throttle, downshift and keep the RPMs > 4500, or go WOT. On flat surfaces, I very rarely, if ever, have this bucking scenario.
My questions are : (1) what is causing this (feels like the DV is opening when it shouldn't) and (2) will your SB or DV cure this / eliminate this issue ?
My questions are : (1) what is causing this (feels like the DV is opening when it shouldn't) and (2) will your SB or DV cure this / eliminate this issue ?
Jan 24, 2011 | 08:50 AM
#45