Just installed an AMS intake on my evo x as well as UICP. I have had a couple problems.
First one was on the way home when i stopped at the gas station when i put the clutch in my RPM's stuck up at about 3k then slowly came down. It only happened once but im not sure why.
The second issue as the title says is fluttering. Im using the stock BOV and its on the correct way (shown on AMS website) But what is happening is when I accelerate you hear the air sucking noise which is a constant sound for the first bit but then starts to make a flutter sound when i keep accelerating under higher rpm's. This is only under acceleration, it then blows off with a normal sound after i let off the gas. Any suggestions? Is this maybe normal?

 

Thought i would add that my MAF sensor is the correct way as well.

 

the flutter is the turbo trying to regulate boost.
or its compressor surge, or both

 

Is that normal? or is that bad? if its bad, what do i need to do to correct it? Should i not be driving it?
Also, if you look at the AMS install pdf (the last picture) http://amsperformance.com/instructio...structions.pdf
you can see the blow off valve sitting the right way but angled a bit. Most other intakes ive looked at have it positioned straight up and down. Should i try to manipulate it to be up and down or should it not make a difference. Mine is sitting at the exact angle as the last picture in AMS's pdf. Sorry for all the questions but I am new to turbo cars and have been a sport bike guy up until now. Thanks for all the help in advance and thanks for bearing with me trying to learn.

 

The wastegate opening/closing rapidly?

 

this flutter sound only happens while accelerating and it doesnt start right away, only after i start gaining higher rpms. Its not a nasty abrupt flutter. its a slight pssh pssh pssh flutter. And i dont have to be accelerating quickly. I just accelerate at a normal pace when it starts fluttering as the rpms start climbing. I dont get any bucking when letting off the thorttle, it just blows off.

 

My wife's mr does the exact same thing. Real annoying so we put the stock intake back on to mask the sound. My gsr doesn't have this issue. I'm real interested in knowing why this happens on her car. Doesn't seem to have any impact on performance.

 

I have a GSR...and the AMS intake...my car does the exact same thing...when you're at partial throttle you hear it start to make that psssh sound. From what I've been told that is normal. But maybe some one will chime in and actually tell you the techincal specs behind why that happends. I wouldn't freak out if I were you, it's ok..

 

yeah its the intake whoosh sucking noise that sounds like it starts to stutter/hesitate. pssh pssh pssh pssh pssh as your accelerating, but the car isnt hesitating.

 

What you are hearing is, in fact, compressor surge. This is normal and happens to a lot of cars using fast spooling turbos.

At part throttle, the turbo will spool and build boost. As the RPMs climb, it wants to keep building boost, but since the throttle plate is only partially open, it's not letting in all the air the turbo is flowing, so the air backs up and surges the turbo a little.

Look at it like a faucet that flows too much water for the sink to drain. Since the water is coming in faster than it's going out, it eventually overflows.

It's normal and it's not really hurting anything, but you can change your driving style if you want to avoid the sound. If you have a boost gauge, keeping the needle at or below 5psi during part throttle acceleration and that should do away with the surge. If not, listen to the sucking sound of the turbo and modulate the throttle to keep it to a minimum. The louder the suck, the more air/boost it's pushing. If you do hear it start to surge, just back off on the pedal a little.

 

thanks alot for that, makes total sense. thats exactly whats happening.

 

woww i have the same problem with the ams intake !! With stock boost control system and bov have no any flutter sound.
But instal the grimspeed 3 port near the same boost level as with the stock boost control valve i have very bad fluttering sound or compressor surge ?!
With better bov like ssqv or synapse dv the sound is much quiter but I can not eliminate it !
I tried evertyhing just lowering the boost to flat 20psi... but on spool up around 3000rpm the sound is there.

What to do with that ? I dont think so it is right with for the turbo
Coud you solve this problem ?

 

that sound like compressor surge. not really sure how to fix it with a 3port, but I'd like to know

 

ohh so it is an understood thing that sound like compressor surge with the 3port and ams intake ? I will mad from it.. try every wgdc settings 4 bov and the sound is there. It is my friends car but he also want to kept the ams intake and the 3 port too..

 

Basically this happens because the force exerted by the compressed air working against the compressor wheel is greater than the force exerted by the exhaust gas driving the turbine wheel. This can be because of two things:

1. a faulty BOV - happens during throttle lift. no exhaust gas charging compressor, but high pressure in charge pipe
2. poor boost control - happens curing acceleration. too much pressure in charge pipe, and not enough exhaust gas working the turbine

Since its happening at low RPM when you're accelerating, it's obviously the 2nd case. Do some logging to see if you wastegate is open when this happens. If so, thats your problem You might also be able to get some more exhaust flow by playing with the MIVEC tables, but I don't know much about how all that works =/ If all else fails, try reducing the boost levels and see if the problem goes away. If it does, then that should validate the problem and indicated that you might have a fault WGA or a problem with your BCS vacuum lines.

I'm still pretty new at this myself, so you might to read around a bit to make sure you understand what I'm suggesting. Can any of the tuner gods confirm that I'm on track here? I don't want to steer anyone in the wrong direction