Synapse dv surge/flutter
Oct 28, 2011, 10:30 AM
#16
Is this with the spring you purchased from me?
This is the 1st issue i have heard of from any evo 8/9/10 users.....other than the guy who bought the spring & put it in his older / large synapse bov
by your description above, you went from surge using the factory spring & with the mil.spec unit, your only able to achieve 1psi? am i understanding you correctly?
if that is correct, i suggest that you pull the bov apart & make sure everything is ok & nothing is bound up, or a o-ring fell out or????
what orientation are you running the valve?
at the very least, put the factory spring back in to verify that it was the way it was before you touched the bov.....
driving a turbo car with only 1psi of boost is complete krap! you bought a turbo'd car & by god, let there be boost!
Last edited by Aby@MIL.SPEC; Oct 28, 2011 at 10:35 AM.
Oct 28, 2011, 10:49 AM
#17
Evolving Member
what bov spring are you using?
Is this with the spring you purchased from me?
This is the 1st issue i have heard of from any evo 8/9/10 users.....other than the guy who bought the spring & put it in his older / large synapse bov
by your description above, you went from surge using the factory spring & with the mil.spec unit, your only able to achieve 1psi? am i understanding you correctly?
if that is correct, i suggest that you pull the bov apart & make sure everything is ok & nothing is bound up, or a o-ring fell out or????
what orientation are you running the valve?
at the very least, put the factory spring back in to verify that it was the way it was before you touched the bov.....
driving a turbo car with only 1psi of boost is complete krap! you bought a turbo'd car & by god, let there be boost!
Is this with the spring you purchased from me?
This is the 1st issue i have heard of from any evo 8/9/10 users.....other than the guy who bought the spring & put it in his older / large synapse bov
by your description above, you went from surge using the factory spring & with the mil.spec unit, your only able to achieve 1psi? am i understanding you correctly?
if that is correct, i suggest that you pull the bov apart & make sure everything is ok & nothing is bound up, or a o-ring fell out or????
what orientation are you running the valve?
at the very least, put the factory spring back in to verify that it was the way it was before you touched the bov.....
driving a turbo car with only 1psi of boost is complete krap! you bought a turbo'd car & by god, let there be boost!
Oct 29, 2011, 06:41 AM
#19
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what bov spring are you using?
Is this with the spring you purchased from me?
This is the 1st issue i have heard of from any evo 8/9/10 users.....other than the guy who bought the spring & put it in his older / large synapse bov
by your description above, you went from surge using the factory spring & with the mil.spec unit, your only able to achieve 1psi? am i understanding you correctly?
if that is correct, i suggest that you pull the bov apart & make sure everything is ok & nothing is bound up, or a o-ring fell out or????
what orientation are you running the valve?
at the very least, put the factory spring back in to verify that it was the way it was before you touched the bov.....
driving a turbo car with only 1psi of boost is complete krap! you bought a turbo'd car & by god, let there be boost!
Is this with the spring you purchased from me?
This is the 1st issue i have heard of from any evo 8/9/10 users.....other than the guy who bought the spring & put it in his older / large synapse bov
by your description above, you went from surge using the factory spring & with the mil.spec unit, your only able to achieve 1psi? am i understanding you correctly?
if that is correct, i suggest that you pull the bov apart & make sure everything is ok & nothing is bound up, or a o-ring fell out or????
what orientation are you running the valve?
at the very least, put the factory spring back in to verify that it was the way it was before you touched the bov.....
driving a turbo car with only 1psi of boost is complete krap! you bought a turbo'd car & by god, let there be boost!
Someone told me to try running the dv without a spring in it so see if it would help with the flutter (this was before you sent me the spring) and thats when i could not build any boost, not even a psi.
I am running my dv in push mode with port a and 1 turn of preload(with your spring and washer). I am pretty sure the dv is working as it should. When i go through the rpm range at partial throttle, the car builds boost then the dv opens then the dv shuts and the car builds boost again and then the dv opens again. Is this normal?
I have a bunch of pictures that i need to put together in a write up/how to/review of the valve and new spring.
Oct 29, 2011, 07:21 PM
#20
^ you may want to increase the preload, 1 turn @ a time. what i experienced, that the increased preload reduce the flutter that followed with slight / minimal throttle reduction...
i am trying to locate a different spring.....hopefully this will be better for the situations described by you.
i am trying to locate a different spring.....hopefully this will be better for the situations described by you.
Oct 30, 2011, 08:29 AM
#21
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Hey guys, thank a lot for all your suggestions. I had not noticed that the thread had grown. I would like to know how exactly should I adjust the prelode. How many turns and so on. I don't want to do something that might affect the car negatively. Thanks 
Oct 30, 2011, 09:51 AM
#22
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^ you may want to increase the preload, 1 turn @ a time. what i experienced, that the increased preload reduce the flutter that followed with slight / minimal throttle reduction...
i am trying to locate a different spring.....hopefully this will be better for the situations described by you.
i am trying to locate a different spring.....hopefully this will be better for the situations described by you.
Oct 31, 2011, 07:08 AM
#23
yeah, i really think i need to place that spring order....what turbo are you running?
Oct 31, 2011, 12:06 PM
#24
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how much boost are you running again?
thats odd/interesting. i run ~30psi & I dont recall there being a boost level change / duty swing to maintain my desired boost target... i will have to review my logs on my pc @ home. i will get back to you.
why dont you just make the adjustment to find out? the time it took for you to type this is about the time it takes to make the adjustment.....or so it is on my evo 8. im not certain of the orientation of your bov in your car, so it maybe a PITA.
yeah, i really think i need to place that spring order....what turbo are you running?
thats odd/interesting. i run ~30psi & I dont recall there being a boost level change / duty swing to maintain my desired boost target... i will have to review my logs on my pc @ home. i will get back to you.
why dont you just make the adjustment to find out? the time it took for you to type this is about the time it takes to make the adjustment.....or so it is on my evo 8. im not certain of the orientation of your bov in your car, so it maybe a PITA.
yeah, i really think i need to place that spring order....what turbo are you running?
I really dont drive my car anymore since the winter season is here and since we got snow last weekend.
Wednesday looks like it might be nice (60s) and i might take the car for a spin to try adjust the dv preload spring.
Nov 23, 2011, 05:52 AM
#26
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Got irritated about it and now I wanna install the spring, but I left it at home. Just asked my cuzin to send it to me
can't wait to install it.
Nov 26, 2011, 02:47 PM
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Not sure if this will help anyone at all because this is my experience with the old synapse bov, not the newer DV.
A+B ports used: Car works great, no flutter ever in any gear. Slightly less boost than using B only.
B only: Only flutter in 5th when letting off with like 1-2psi. Strangely my car will hold more boost in this config.
A only: flutters all the time even during light acceleration where i was in vacuum the entire time.
So, maybe you guys with fluttering issues should try a different port setup? Again, this is with the old Synapse Bov, not the DV so this may not apply. Also, all my observations were without adjusting the preload.
A+B ports used: Car works great, no flutter ever in any gear. Slightly less boost than using B only.
B only: Only flutter in 5th when letting off with like 1-2psi. Strangely my car will hold more boost in this config.
A only: flutters all the time even during light acceleration where i was in vacuum the entire time.
So, maybe you guys with fluttering issues should try a different port setup? Again, this is with the old Synapse Bov, not the DV so this may not apply. Also, all my observations were without adjusting the preload.
