Subaru Forester Owners Forum banner

1 - 7 of 7 Posts

·
Registered
2005 Forester XT 4eat
Joined
·
28 Posts
Discussion Starter #1
I have a new flutterying noise, very quiet, not quite the same noise as the turbo spooling up, there may be a decrease in power during the fluttering noise its hard to tell, it happens around 10-12psi if i had to guess, it may be the turbo and I making it all up in my head, but I am wondering if my internal wastegate is doing something it should'nt or is opening too early before the tuned 16.5 psi, also wondering if I should just reflash the current tune and have the ECU maybe unlearn whatever it may be. or maybe its just a sound I am hearing as I am listening to the car more clearly now that I have owned it for 8months and can understand some of what I am hearing more. If a relearn/reflash is not the answer what is, if anything is indeed wrong.

current build
2005 Forester XT
VF39
07 sti tmic
stp intake
cobb 3" down pipe
stage 3 pro tune
set for all the mods and 16.5 psi (except for the intake, but I have re-flashed since putting it on)
 

·
Premium Member
2006 FXT Lux
Joined
·
382 Posts
current build
2005 Forester XT
VF39
07 sti tmic
stp intake
cobb 3" down pipe
stage 3 pro tune
set for all the mods and 16.5 psi (except for the intake, but I have re-flashed since putting it on)
You haven't listed what you're using for boost control, so I'm assuming you're using the stock solenoid?

My 3 port controller (MAC) makes a noticeable fluttering noise with my VF48 as I get into higher boost/approaching target boost as it starts venting excess boost pressure. It's kind of an on-off-on-off-on-off scenario many times per second, so it gives you that ts-ts-ts-ts-ts-ts and much louder/more noticeable than the stock 2 port controller.

I was going to originally suggest your wastegate actuator but that really only applies to the stock TD04, the VF series turbo actuators are fine and non adjustable anyway.
 

·
Registered
2005 Forester XT 4eat
Joined
·
28 Posts
Discussion Starter #4
Its ecu and the stock vf39 internal wastegate, i beleive the normal spring from the stock vf39 as well, i did a quick data log this morning and at 16.61 psi i have 82.31% wastegate duty. My tune is supposed to be 16.5psi, does this mean Im "peaking", I was thinking it might be just a normal noise as I get close to max boost but wasnt sure it was normal. Furthermore ive only notice it when I hold the boost to around 10-13, again thats a guess but probably close.
 

·
Registered
2005 Forester XT 4eat
Joined
·
28 Posts
Discussion Starter #5
Ill check for an up pipe leak or just tighten things down, its possible. Thanks for the suggestion.
 

·
Registered
2005 Forester XT 4eat
Joined
·
28 Posts
Discussion Starter #6
Well if there is an up pipe leak it is super faint and hard to tell. Is there a easier to tell other than trying to see fumes from underneath and from above?
 
1 - 7 of 7 Posts
Top