Ford Powerstroke Diesel Forum banner

03 turbo going quiet??

5K views 13 replies 7 participants last post by  kinnisoj 
#1 ·
What would cause a turbo that is producing great boost (25 @ 6000') dosnt seem to have any leaks but, it just dosnt sound as loud as when I first installed it. Ecspecially at idle. Is this possible? What would cause this?
 
#2 ·
Maybe you are getting used to it? maybe load the stock tune and switch back?
 
#4 ·
:scared: :Shocked: What's that like? :D
 
#6 ·
I wont argue that Im getting old... but the turbo at idle just dosnt sing like it did.
 
#7 ·
Maybe the vanes are stuck so it's not cycling while idling. Mine will cycle between 15% and 85% most of the time and sometimes it will just sit at 67% and be happy there.
 
#8 ·
The turbo could be stuck in the perfect spot. Believe me, it happens. I recently cleaned a turbo in a 6-speed truck that definitely had a negative affect on performance. It's really hard to explain to a customer that their truck runs worse now after I "fixed" it.


The whistle at idle is caused by the vanes being all the way closed creating the most backpressure and it needs the highest VGT duty cycle to do that.
 
#10 ·
Ok if I remember correctly I saw the vgt% on my Edge CTS. What should it read?
 
#11 ·
It may read between 60-85% at idle. When it reads high the PCM is trying to warm the vehicle up faster.


I definitely noticed my 03 turbo wasn't much louder at idle than my 06, it was off idle that the thing started screaming. Eventually I did get used to the the 03 and it lost its appeal.
 
#12 ·
Okay at start up with engine somewhat warmed up it went to 85% very quickly. Then after warming up a bit and while reving it up it would drop to 35%.
 
#14 ·
Only "tune" I have is the atlas 40. I saw readings around 30% revin it up in the driveway. Dont know if I need to be actully running down the road and do a WOT.
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top