Synapse Hybrid Bov Review
- Thread starter driver311
- Start date
how funny, i did the same thing at HD. those are the only ones to use.
i took both flanges to the store, did it there.(rockon)
however, i ran into fitment issues with the positioning. i couldnt get the recirc tube to fit comfortably without having the valves twin nipples clear the hood. yes, i can stretch and twist the tube to "make" it fit, but you see that it has too much stress, especially, when you try to position the valve the correct way. so I gave up. didnt even try it out. put it back to stock.
i would love to see some pics on how some people have it on there.
besides the forge, what other valve just slaps on?
here is the way the Synapse has to fit usning the COBB SRI the vac lines will clear the hood.
View attachment 129035
View attachment 129035
I agree! If only it didn't make the coin sound.
patty AT forge
Member
patty AT forge
Member
Absence of the ability to adjust the valve doesn't mean that the performance of the valve couldn't be improved if the adjustment were available. Cars don't come from the factory with user adjustable boost...
AutoXRacer
Member
And you don't have to mess with shims or springs with the HKS; you also have the option to run it in recirculation or VTA with no additional parts to buy. Also, the HKS holds more boost for future higher/bigger turbo applications and better response time than the traditional push type BPVs. The sound is also 1000X better!!!
Just my 0.02 cents...
Not trying to knock Forge...I think its an excellent product...its just there are other options out there. And seeing how everyone is continuously swapping springs and shims to find the perfect tune, its seems a little frustrating/annoying to own.
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patty: eventhough i love the sound of the forge as it is now, i'd still want to hear the revised version when it comes out.
what exactly are you going to do to change the sound? make the piston out of rubber?
AutoXRacer
Member
HKS had adjustment capabilities in the past... Owners kept messing with adjustments that lead to failures of turbos and ideal valve settings.
As a result, HKS is now a direct bolt-on and the valve adjusts its self according to boost pressures...just regurgitating HKSs's info...
patty AT forge
Member
Hmm. Well with the design of our valve the only difference in pressure between the top and bottom of the piston will be from pressure drop, this pressure differential is what opens the valve and said differential must be greater than the seat pressure of the spring in the valve for it to open. The cracking pressure of the yellow spring is around 8 psi if I remember correctly so as long as your intercooler doesn't have 8 psi of pressure drop our valve won't open with the softest spring that we include.
Variables: intercooler temp, ambient temp, coolant temp, mass-air, map, timing, throttle angle, solenoid duty cycle. Consider these for a moment. Now with a comparison made with only two data points, one for each valve in question, ALL OF THE ABOVE variables must be the same for the data to be conclusive.
I have both synapse and Forge the performance is very similar I noticed a small amount more boost in higher RPM... I say again the Forge is a great valve less install time more stock appearance all for Cheaper price..... sound is well not the best but looks like its being addresed
patty AT forge
Member
Hold more boost? How so? Our valves are held shut by boost, their valve is held shut by boost. As boost raises so does the clamping force. On ours and theirs.
Sounds like marketing to me... lower production costs and come up with some type to convince people that the product is just as good.
I'm all for options and alternatives, we ARE an alternative in just about every market. HKS and Greddy probably have more guys mopping the floors after they close than Forge employs. Synapse is probably similar in size to us, so I'm rooting for them along with us, underdogs need to stick together. I just like information to be accurate and fair.
+1
patty: eventhough i love the sound of the forge as it is now, i'd still want to hear the revised version when it comes out.
what exactly are you going to do to change the sound? make the piston out of rubber?
I think that the sound is a whistle rather than a ping. like when you blow across the top of a coke bottle, except with a lot more pressure, and for a very short period of time. the shape of the piston is being changed I believe.
I'm not 100% sure on this, but I did ask patty about it and she kind of agreed with me on this if I remember correctly.
AutoXRacer
Member
Again, I don't want to come off as trying to knock Forge in any way...
I'm just trying to get in depth info here; for myself and others. I don't understand how the push type valve is held closed by boost, since boost is pushing on the valve. Can you explain?
This is HKS's description of how their valves work, which led me to purchase one over the traditional push type valves (HKS diagram attached).
The HKS Super Sequential Blow-Off Valve (SSQV) is a dual stage pull-type relief valve. Unlike typical push type blow-off valves, the SSQV will not leak under any level of boost because the boost pressure in chamber "C" keeps the valve closed against its seat (Diagram 1). The SSQV releases excess boost when there is a pressure alteration in chambers "A & B", not by the rate of boost pressure or vacuum in the line. This ensures a quick valve response and complete closure during idle. Many competitors use a push-type blow-off valve design with a large valve to accommodate high boost / high horsepower applications. These large valves react slowly and require high pressure to open, and are not able to activate and prevent compressor surge at light-load conditions. On the other hand, smaller, fast reacting push-type valves do not discharge the airflow capacity required for high horsepower applications and tend to slowly open and leak as boost pressure overpowers the spring. For maximum performance, the HKS SSQV incorporates both a small primary valve for ultra quick activation, and a larger secondary valve for additional discharge capacity. The SSQV is engineered to initially open the small primary valve at light throttle and load conditions (Diagram 2), then sequentially opens the secondary valve for additional relief capacity under high boost and load conditions (Diagram 3).
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patty AT forge
Member
That is the theory... We use the same pistons in the 007 and if you reverse them they make the same sound.
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