Synapse Synchronic DV Fluttering?
May 5, 2011, 10:16 PM
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Synapse Synchronic DV Fluttering?
Hey all whats going on?
I recently had some parts installed on my evo and then had it tuned, one of the parts being Synapses new DV.
I noticed that sometimes when I get into boost gradually the blow off valve flutters like crazy at 20+ pounds, thats with me gradually pushing the gas peddal down. When I whomp on it and floor it quickly it acts normal, I spike to 30 and drop to about 28 pounds. I just wanted to know if this is normal or if I should go with a different setup on the Valve itself. There are "A" and "B" Slots for vacuum hoses to be hooked up too. I have the hose hooked to the "A" Slot which is the one on the top. Any ideas or thoughts? Thanks, also i can post pictures to be more specific about the setup.
I recently had some parts installed on my evo and then had it tuned, one of the parts being Synapses new DV.
I noticed that sometimes when I get into boost gradually the blow off valve flutters like crazy at 20+ pounds, thats with me gradually pushing the gas peddal down. When I whomp on it and floor it quickly it acts normal, I spike to 30 and drop to about 28 pounds. I just wanted to know if this is normal or if I should go with a different setup on the Valve itself. There are "A" and "B" Slots for vacuum hoses to be hooked up too. I have the hose hooked to the "A" Slot which is the one on the top. Any ideas or thoughts? Thanks, also i can post pictures to be more specific about the setup.
May 7, 2011, 02:10 AM
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You may be experiencing pure compressor surge. Since the SB/DVs don't leak at all, they allow the compressor to push full flow, maybe more than the compressor can load in part throttle conditions. The best way to verify this is to do some runs where the SB/DV is capped at the discharge so as to act like nothing is on the pipe. If it still flutters under load, on boost, gauge goes crazy, and AFRs are all over the place, then that is the type of surge that a BOV really can't do anything about.
You can try running it in push, with as little pre-load as possible on Port B, this will allow the DV to leak slightly at part throttle conditions where there is way more boost pre-throttle than post throttle. Once you go WOT, the DV the closes shut and seals all boost.
You can try running it in push, with as little pre-load as possible on Port B, this will allow the DV to leak slightly at part throttle conditions where there is way more boost pre-throttle than post throttle. Once you go WOT, the DV the closes shut and seals all boost.
May 7, 2011, 12:17 PM
#6
You may be experiencing pure compressor surge. Since the SB/DVs don't leak at all, they allow the compressor to push full flow, maybe more than the compressor can load in part throttle conditions. The best way to verify this is to do some runs where the SB/DV is capped at the discharge so as to act like nothing is on the pipe. If it still flutters under load, on boost, gauge goes crazy, and AFRs are all over the place, then that is the type of surge that a BOV really can't do anything about.
You can try running it in push, with as little pre-load as possible on Port B, this will allow the DV to leak slightly at part throttle conditions where there is way more boost pre-throttle than post throttle. Once you go WOT, the DV the closes shut and seals all boost.
You can try running it in push, with as little pre-load as possible on Port B, this will allow the DV to leak slightly at part throttle conditions where there is way more boost pre-throttle than post throttle. Once you go WOT, the DV the closes shut and seals all boost.
exactly!
what turbo is it?
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