Flutter
Flutter
Hello everyone. I have a 2006 IX MR SE I am running an injen Intake with upper and lower IC pipe, Perrin 3" down pipe, no cat, Greddy T-IC cat back and is being tuned at the moment.
The car pulls damn strong from a standing start and through all the gears with no problems.
its when your in 5th or 6th gear crusing and then stand on it, it flutters. it still pulls like a mother but what the heck is the flutter from? My VIII never did this, with virtually the same mods. Is it the MR blow off valve doing it, does it needs some modification? i am currently running at 22.5 pounds boost with the HKS EVC 6.....
thoughts?
The car pulls damn strong from a standing start and through all the gears with no problems.
its when your in 5th or 6th gear crusing and then stand on it, it flutters. it still pulls like a mother but what the heck is the flutter from? My VIII never did this, with virtually the same mods. Is it the MR blow off valve doing it, does it needs some modification? i am currently running at 22.5 pounds boost with the HKS EVC 6.....
thoughts?
If it is the BOV, you can look to get a TiAL reroute valve.. or a VTA BOV if you want. That'll get rid of it. You may want to figure out which way you're going (reroute or VTA) pre-tune to maximize potential.
The flutter that you are hearing is the BOV which is slightly opening because of the maount of boost you are running.
Can we assume you tuned to 22.5psi in 3rd gear? If so your higher gears will actually see higher boost at lower RPMS. For example if you are at say 2500rpms in 6th gear and mash the gas you may actually boost to 23-24 or 25psi, thus causing the BOV to open slightly.
I highly doubt that it is compressor surge since that would only really happen when you completely let off the gas while in boost. The surge happens when the compressed air does not get let out by the BOV and therefore gets sent backward toward the turbo, thus surging and stopping the turbo altogether.
If your BOV is adjustable you can just make it a tiny bit stiffer that way it will not open. You could also turn your 3rd gear boost down slightly which will in turn lower the higher gear boost. Personally I would not mess with it a whole lot since it still pulls hard and your BOV does not stay wide open.
Can we assume you tuned to 22.5psi in 3rd gear? If so your higher gears will actually see higher boost at lower RPMS. For example if you are at say 2500rpms in 6th gear and mash the gas you may actually boost to 23-24 or 25psi, thus causing the BOV to open slightly.
I highly doubt that it is compressor surge since that would only really happen when you completely let off the gas while in boost. The surge happens when the compressed air does not get let out by the BOV and therefore gets sent backward toward the turbo, thus surging and stopping the turbo altogether.
If your BOV is adjustable you can just make it a tiny bit stiffer that way it will not open. You could also turn your 3rd gear boost down slightly which will in turn lower the higher gear boost. Personally I would not mess with it a whole lot since it still pulls hard and your BOV does not stay wide open.
The flutter that you are hearing is the BOV which is slightly opening because of the maount of boost you are running.
Can we assume you tuned to 22.5psi in 3rd gear? If so your higher gears will actually see higher boost at lower RPMS. For example if you are at say 2500rpms in 6th gear and mash the gas you may actually boost to 23-24 or 25psi, thus causing the BOV to open slightly.
I highly doubt that it is compressor surge since that would only really happen when you completely let off the gas while in boost. The surge happens when the compressed air does not get let out by the BOV and therefore gets sent backward toward the turbo, thus surging and stopping the turbo altogether.
If your BOV is adjustable you can just make it a tiny bit stiffer that way it will not open. You could also turn your 3rd gear boost down slightly which will in turn lower the higher gear boost. Personally I would not mess with it a whole lot since it still pulls hard and your BOV does not stay wide open.
Can we assume you tuned to 22.5psi in 3rd gear? If so your higher gears will actually see higher boost at lower RPMS. For example if you are at say 2500rpms in 6th gear and mash the gas you may actually boost to 23-24 or 25psi, thus causing the BOV to open slightly.
I highly doubt that it is compressor surge since that would only really happen when you completely let off the gas while in boost. The surge happens when the compressed air does not get let out by the BOV and therefore gets sent backward toward the turbo, thus surging and stopping the turbo altogether.
If your BOV is adjustable you can just make it a tiny bit stiffer that way it will not open. You could also turn your 3rd gear boost down slightly which will in turn lower the higher gear boost. Personally I would not mess with it a whole lot since it still pulls hard and your BOV does not stay wide open.
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Here is some paperwork directly from FORGE for their RS BOV which I have. As you can see toward the bottom of the page it describes "Flutter".
Just thought this might help.
Just thought this might help.
It should not happen at WOT - it should only be happening when trying to accelerate at part-throttle/partial boost. It's caused by the BOV being strong and not going WOT. If you're getting flutter at WOT, then something is wrong.
Jason
Im going to take a stab & say its not he Bov at all. Does the flutter "only" happen at below 3k at WOT in gears 4-6? If you keep it at WOT when the RPM's pass 3200 does it stop & boost normal? If so its not your BOV.
