Turbo boost issue with my 1m

[cosmick]

Hello friends,

I recently bought a 1M.


I have some recent problem with it

Here is the problem (when it happens):
In acceleration (kickdown)under 3500 rpm, the turbo boost in very low. I can see it because i have a Awron display and feel it because the power is low.
Above 3500rpm the boost arrives and it is too hight.
The car goes in limp mode and the stored errors are Boost too low and boost too high.

The problem occured for the first while i driving from spain to france and the weather was very hot.
I went to BMW, they change the 2 wastegate solenoids but it does not solve my problem.
During the 1600kms from spain to france, the problem occured many time. It always happens if I turned off/turn on the car, and after 30 minutes/1 hour the car worked again normally.

Since i'm back in france, i had the problem only one time and only during one acceleration.
The car seems to work normally, but sometime have a wastegate sound in idle.

Can i be a wategate issue (sometimes one of it does not totally close) ?

Any ideas ?

Thanks for your help.

[Dackelone]

I bet it's your wastegates actuator arms biding. They aren't moving(opening and closing) freely.


Maybe test your vacuum lines...

[cosmick]

I will check it, do you think that it can work sometime and sometime not ?

[Dackelone]

Originally Posted by cosmick

I will check it, do you think that it can work sometime and sometime not ?

Yes, IF it is the turbo's actuator arms(wastegate) arms that are binding(not opening and closing smoothly).

[cosmick]

So the solution is to change the turbos

[MDORPHN]

Does the car have an aftermarket tune?

Neil

[cosmick]

Yes of course
+ wagner intercooler and down pipe
+ and milltek cat back

[MDORPHN]

Originally Posted by cosmick

Yes of course
+ wagner intercooler and down pipe
+ and milltek cat back

So, what tune and have you logged any WOT runs?

Also, any codes?

Neil