Hmm..that sounds really weird at the beginning of the first video. Kind of sounds like compressor surge so you might be dealing with compressor surge and WG flutter.

What size turbo and boost are you running?

 

It's an ETS ball-bearing 5857 turbo with anti-surge housing, running 26 psi. Basically it's between a GT30 and GT35 in size, probably a little closer to the GT35.

This is the log from that first video (the third and fourth gear pull):




So I pulled my wastegate off today and found out some interesting things. First I thought I had a 38mm tial, but once I looked it up I have a 44mm since it's their MV-R wastegate. I pulled it open to check the spring rates, and it only has their .8 bar (11psi) springs in it. SOOO I'm wondering if the larger wastegate in conjunction with the low spring rate could be causing wastegate flutter, if that is what the sound actually is. I'm wondering if adding another spring will help.

When I run the car with 0 boost control from the ecu, it still will make 18-19psi, so I probably couldn't add a whole lot of spring pressure, maybe another 5psi.

 

I'm still learning so maybe some one else can help you out with that log. Doesn't make much sense to me. Does look weird though, is load suppose to drop like mid 3rd gear?

About the wastegate, I have herd swapping to stiffer spring helps the flutter. I have not checked to see what spring I have but I think it's the .8. I might try swap it for something stiffer and see if it helps any.

 

It's dropping cuz it's clipping. Right now I have evoscan only reading to 357load, and I'm hitting above that, so when I hit above that it drops down on the graph, thus the weird display

 

Makes sense

 

As a rule of thumb you should only try to double wastegate spring pressure in terms of your boost setting. So, if you have a .8bar spring you should target to run 23psi as a max. If you're going to run 30psi then you should target a base spring pressure of 20psi to be safe.

If you have a .8bar spring and you're truly just running on spring pressure then you may have boost creep issues if you hit 18psi. A true test is to run a boost source straight to the bottom port bypassing the boost controller. Even with a Tial 38mm you should not have creep issues unless you have restrictions in the manifold design. A sign of this will be hitting the target boost quickly and then boost ramps up with RPM.

I would also check the integrity of your vacuum hoses and definitely up the base pressure rating on your wastegate spring.

 

Have you tried just running off the wastegate spring, just bypassing the boost controller. That will answer your questions of whether the gate is functioning properly, at least for the most part. Also, I know you said you like the setup you have, but for $50 you could throw in a manual boost controller to see if you've got the same symptoms, that is if the gate doesn't flutter when just running off spring pressure. this way you can move up in 2-4psi increments to see if it's happening at a set boost level.

If it's still fluttering on just spring pressure, check the lines going to the gate and make sure there aren't any tears/holes/leaks, but I'm sure you've checked that.

Another common possibility is people forget to install the metal o-ring between the wastegate and manifold.

And lastly, your spring just might be too strong, but at 30psi, it's doubtful you'd be running into a spring-related issue.

Good luck.

 

I use to run a hallman at 28psi and it did not flutter. But I did a re-tune for e85 and enabled map switching so I had to install a 3 port. Thats when it started. I know my WG is functioning correctly and I dont have leaks. It has to be either the tune or how the 3 port works.

I received my new laptop, but there is another delay.
I purchased a different manifold to get rid of the short runner manifold Im currently using but this new manni has a tial44 flange so I need to upgrade to a 44mm. Once that comes in, which should be in a week or 2, ill start trying everyones advice.

If anyone else has any suggestions, Im all ears. Ill try everything to get rid of this annoying flutter haha.

 

Any updates on this? Im tuned for about 27 psi and i thought the flutter noise in boost from my new synapse. 2, 3, 4 gear my car sound like the videos when im in boost over 10psi and anything less the 100% throttle. Full throttle into full boost, it does it a little but not as bad as the ones in the video.

 

now im not too familiar with tial wastegates but on the stocky u can adjust the flapper arm for more preload... can you do that with yours...?? now did u double check and make sure that you dont have an exhaust leak around the mani or turbo...becuz if u do... then not all the exhaust gas is leavin correctly which could possibly have somethin to do with it...now ur bov is functioning properly too right...
just tryin to add my 0.02 to help
good luck

 

No updates. Soon though. I received the new manifold and wastegate. Just waiting on dump tube and gaskets. Should be here in the next few days and I'll start trying out possible solutions

 

So I have stronger springs in my wastegate now... no more flutter...

Of course I'm not currently having to use the BCS at all to hit the 26psi I'm going for, so I can't say if that can cause it, but I definitely know I don't have flutter now!

 

really? so you just got stiffer springs? although its just because you are running the the spring and dont have the grimmspeed controlling it. im assuing you got the .9 bar spring? I plan on putting a stiffer spring in my WG also but cant try anything out untill this damn dump pipe comes in from full-race. they have been making it for the past 3 weeks

once it comes in i can finally start fixing the flutter.
glad you figured it out. **** is annoying.

 

Right now I have 21.75psi of spring pressure. Having played with it more, I now hit right around 22-24psi instead of the 26-27psi I was hitting when I first installed it, so I will have some room to start bringing the BCS back into play and can report what I find.

This car seems to like boost a lot more than timing, so I may end up running 30psi We'll see how the tuning goes and what kind of returns I get.

But yes, at the very least the flutter is gone at the same boost pressure, and the turbo is actually seeming to spool faster.

I'll report back once I start kicking the BCS back online, hopefully tomorrow.

 

every grimmspeed EBCS i have ever seen tuned (3) have had the wastegate flutter.

One thing newcommer did, he used the smallest vaccum lines possible and he sai dthat gave him the most consistant boost control with the grimmspeed ebcs.