last summer i had a hard time getting my ssqv to work correctly and upen up fully with throttle release. (it would just chatter)

i joined the hksusa.com forums and no one there could even explain how the valve worked let alone explain how to fix the problem.

so i took action and after some thinking about how the valve is designed, i removed the spring from the valve and ran it with no spring.
this works great, full pressure release under vacuum and holds boost great.
the only problem with this is having no spring in the valve makes it a little sloppy and it makes the valve hesitate under high boost settings.

so today i took a trip to the industrial part of town in search of a business that makes custom springs.
right now i have the operations manager crunching numbers to make a compression spring that has tension that of the full vacuum pressure of a typical motor under idle or full vacuum.

while we were there we figured out that most hondas idle at about 19-22HG, so using that we decided to go with a 20HG setting to be safe, and converted that to PSI, which comes out to about 4-5 PSI i believe.
using that he can make the dimentions as close to the stock spring as possible only making the spring operate under 20HG.
i lost the origional spring that came with the valve, but i plan on finding it and testing the tension of the spring as for how close to 20HG it is set at. just from handling the spring in the past it seemed to be stronger than 20HG which would explain why the valve wouldn't open after i released throttle when i had it on the car.

as for the origional problem of the flutter that the bov was giving off, i tried these things to fix the problem. some people have had success with these methods but it didn't solve my problem:
-Teed off the vauum booster for stronger signal
-removed the emissions device that prevents the throttle plate from snapping shut (zc motor)
-tried different vacuum sources.
-gauge is clearly showing 20-22hg under idle and throttle release

from what hks can tell me, the valve is suppost to be closed at idle, but it should open under throttle release (which is the same pressure as if the motor was at idle, and plus there is pressure in the tube which puts more pressure on the bov diaphram holding it closed.

almost everyone i have talked to that runs the ssqv has reported that it flutters under light boost and makes a high screeching under full boost.
when i had the spring removed, it would give off a pssssssssssshhhhhhhhh under low boost and would give a loud screech at high boost.
which hints that the valve was holding back air with the spring.

i will report back with how the spring functions, and if all goes well, if anyone has or is having similar problems i can either give you exact specs for the wire used for the spring and the tension numbers, or have more than one made and ship several out pre made.

comments? questions?

 

great.. i just ordered an HKS SSQV for my gs-r and was worried about if it would only flutter (my friend put an SSQV on his evo, and it flutters under light throttle/lower boost but makes that sexy woosh when hes hitting it hard.. but then again the evo pumps 19psi of boost so im a little worried if my current 7psi is enough to make it do that..)

anyways when you have it done, be sure to post the spring specs and your results. and once i get my SSQV i might very well order one of those custom made springs