Post your Synapse DV config and results
#181
Evolved Member
iTrader: (41)
BOV flutter, Wastegate flutter, or compressor surge
So i got my Synapse installed tonight. I decided to try it in push mode first with the vac line hooked up to Port B and Port A VTA. The car seems to build boost faster and pulls really good in 1st and 2nd (only hitting aobut 22 psi in these gears). But in the 3rd-5th I get a flutter sound once I hit around 25 psi. What do you guys think is making the flutter- BOV, wastegate, or compressor surge?
I know I need to retune the car because I'm quite certain now that my old BOV was leaking. I just wanted to get some input on what could be causing the flutter before I tackle the retune.
I know I need to retune the car because I'm quite certain now that my old BOV was leaking. I just wanted to get some input on what could be causing the flutter before I tackle the retune.
#182
Evolved Member
iTrader: (90)
So i got my Synapse installed tonight. I decided to try it in push mode first with the vac line hooked up to Port B and Port A VTA. The car seems to build boost faster and pulls really good in 1st and 2nd (only hitting aobut 22 psi in these gears). But in the 3rd-5th I get a flutter sound once I hit around 25 psi. What do you guys think is making the flutter- BOV, wastegate, or compressor surge?
I know I need to retune the car because I'm quite certain now that my old BOV was leaking. I just wanted to get some input on what could be causing the flutter before I tackle the retune.
I know I need to retune the car because I'm quite certain now that my old BOV was leaking. I just wanted to get some input on what could be causing the flutter before I tackle the retune.
#184
Evolved Member
iTrader: (41)
So i got my Synapse installed tonight. I decided to try it in push mode first with the vac line hooked up to Port B and Port A VTA. The car seems to build boost faster and pulls really good in 1st and 2nd (only hitting aobut 22 psi in these gears). But in the 3rd-5th I get a flutter sound once I hit around 25 psi. What do you guys think is making the flutter- BOV, wastegate, or compressor surge?
I know I need to retune the car because I'm quite certain now that my old BOV was leaking. I just wanted to get some input on what could be causing the flutter before I tackle the retune.
I know I need to retune the car because I'm quite certain now that my old BOV was leaking. I just wanted to get some input on what could be causing the flutter before I tackle the retune.
#185
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Join Date: Feb 2007
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Installed the bov (synapse) a couple days ago, I must say its great. running pull mode with port b. One thing I can say is that when I go wot after around 17 PSI it flutters and jumps to around 22 psi, could it be because I reached my boost limit?. I'm tuned for 27 psi i had to turn it down due to fluttering issues with the old dv (forge). Tonight switch vacuum line to port A and B the throttle respond was amazing, how ever around 6 psi I would here like a leaking sound and it felt like I hit a wall. A couple of days ago I had it in push mode and did not experience the issue but fluttered at higher boost. So I guess I'm going to play with the adjusting screw to see if that helps. Anyone have the issues I'm having? I do love the bov though.
#186
Evolved Member
iTrader: (41)
Installed the bov (synapse) a couple days ago, I must say its great. running pull mode with port b. One thing I can say is that when I go wot after around 17 PSI it flutters and jumps to around 22 psi, could it be because I reached my boost limit?. I'm tuned for 27 psi i had to turn it down due to fluttering issues with the old dv (forge). Tonight switch vacuum line to port A and B the throttle respond was amazing, how ever around 6 psi I would here like a leaking sound and it felt like I hit a wall. A couple of days ago I had it in push mode and did not experience the issue but fluttered at higher boost. So I guess I'm going to play with the adjusting screw to see if that helps. Anyone have the issues I'm having? I do love the bov though.
#189
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One area that needs looking into is the MIVEC timing. We haven't had a chance to dig deep into it, but it may be something worth looking into.
If you're in San Diego, we have some new tools that can get the data we need to answer these questions. You can contact us to schedule a time, if you're interested in answering some of these questions.
#191
Evolved Member
iTrader: (90)
Synapse...What exactly are you referring to when you say mivec timing? Mild mivec map? Aggressive map? I have a pretty aggressive mivec map in my car that john Bradley posted a while ago that I made some slight changes to. I have had no issues with my DV...works great...
#192
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i just did the mod with the different nipples that synapse said to do and now the dv works great it drives like stock and holds boost so much better. i think this is the best dv on the market
#193
Evolved Member
iTrader: (41)
It all sounds like you guys are bouncing off the surge line. There are 2 ways to solve this on the same turbo, either unload the compressor by leaking some boost, or take some energy away from the turbine by opening up the wastegate. Either way, the turbo shaft speed just needs to get to the same number on the other side of the surge line. It is better to take a little energy away from the turbine by wastegating rather than leaking it out the compressor side. Compressor side control is pretty efficient, but you will likely make significantly more power taking it out of the turbine than out of the compressor.
One area that needs looking into is the MIVEC timing. We haven't had a chance to dig deep into it, but it may be something worth looking into.
If you're in San Diego, we have some new tools that can get the data we need to answer these questions. You can contact us to schedule a time, if you're interested in answering some of these questions.
One area that needs looking into is the MIVEC timing. We haven't had a chance to dig deep into it, but it may be something worth looking into.
If you're in San Diego, we have some new tools that can get the data we need to answer these questions. You can contact us to schedule a time, if you're interested in answering some of these questions.
#194
Evolved Member
iTrader: (72)
Finally got to track test the Synapse diverter valve in its multiple orientations over the weekend. In both, autox and road course, I find that the valve works much better in port B only. Running both ports gave me flutter, and alittle bucking. Furthermore, I find that running push mode was the best for my setup. Mind you, I have the TiAL flange setup, and the bov is mounted directly to the uicp, and not the intake pipe like most stock configurations. During the testing, I ran into the same partial throttle issues I did with the TiAL. However, I started playing with the preload adjust, and it started working better and better. I'm right at the halfway point of the adjustment, and works really well. The car feels absolutely amazing on and off throttle.
#195
Evolved Member
iTrader: (90)
Finally got to track test the Synapse diverter valve in its multiple orientations over the weekend. In both, autox and road course, I find that the valve works much better in port B only. Running both ports gave me flutter, and alittle bucking. Furthermore, I find that running push mode was the best for my setup. Mind you, I have the TiAL flange setup, and the bov is mounted directly to the uicp, and not the intake pipe like most stock configurations. During the testing, I ran into the same partial throttle issues I did with the TiAL. However, I started playing with the preload adjust, and it started working better and better. I'm right at the halfway point of the adjustment, and works really well. The car feels absolutely amazing on and off throttle.