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2Addicts | BMW 2-Series forum Technical Topics N55 (M235i) Engine, Transmission, Exhaust, Tuning Turbo dying

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      01-26-2019, 09:15 PM   #1
bryan_G01
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Turbo dying

I think my turbo is dead, or about to be...

Power seems like its lost substancial power although the meters do creep up to about 340hp it usually only shows 245 when im WOT... On a stage 2 tune i think it should show much higher.. but its an ots map so maybe thats what it is.

Im also getting this whining noise, its more of an electrical sound than a police siren, but i can hear it. Also it seems like i cant push more boost than 11 psi through most the power band.. power feels flat.
I think they are toast, and 45k of high abuse is a decent life expectancy.

Anyone had turbos go bad, or can comment on what to look for on n55?

Also anyone have a shop that has swapped n55 turbos in the tri state that you would recommend, lmk.
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      01-26-2019, 11:21 PM   #2
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Damn...
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      01-27-2019, 05:37 AM   #3
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Call Laura at Thompson in Doylestown - a bit of a ride for you but at least start with a phone convo. I think Matt left there but Laura is very good.
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      01-27-2019, 12:49 PM   #4
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      01-27-2019, 10:36 PM   #5
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are you still having issues with that harness from your other post as well?
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      01-28-2019, 08:10 AM   #6
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Post a log.
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      01-28-2019, 12:10 PM   #7
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same harness, i have to replace the main harness, no one wants to do it. Not even bmw...
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      01-28-2019, 12:10 PM   #8
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Failing diverter valve not holding boost maybe?
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      01-28-2019, 01:39 PM   #9
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Quote:
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Failing diverter valve not holding boost maybe?
Agreed. Did u upgrade to a GFB DV+?
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      01-28-2019, 08:25 PM   #10
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i have one. need to put it in.

im pretty sure acuators are stuck too, and from heat, wheels messed up rubbing making whistle sound.

saw some other videos online n54, n55, same sounds. pretty sure turbo is cooked or about to be.

Plan is new turbo & DV+ install. just need to find a good shop.
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      01-29-2019, 09:40 AM   #11
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Quote:
Originally Posted by bryan_f22 View Post
i have one. need to put it in.

im pretty sure acuators are stuck too, and from heat, wheels messed up rubbing making whistle sound.

saw some other videos online n54, n55, same sounds. pretty sure turbo is cooked or about to be.

Plan is new turbo & DV+ install. just need to find a good shop.
Are you going to upgrade the turbo? Or throw another stock in? Did you get your hands on that dinan one?
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      01-29-2019, 10:02 AM   #12
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the dinan one was sold, i woulda threw that one in.


ill probably throw a pure stage 2 in. If stock is going to be 2k, pure really isnt that much more for alot more power.
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      01-29-2019, 10:43 AM   #13
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who has ps2 cheapest right now?
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      01-29-2019, 10:47 AM   #14
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+1 on upgrading turbo if replacing, but sounds like you're just guessing. Why not log to verify your suspicion first?
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      01-29-2019, 10:57 AM   #15
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Id probably go with a smaller speedtech unit. Afterall the Pure stage two is still a hybrid. With how hard you work the car on the track the EGTs will get high with the stock manifold.
Also I would argue that the turbos speedtech uses are more reliable. Though it will cost more.
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      01-29-2019, 11:02 AM   #16
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Quote:
Originally Posted by arhoads335i View Post
Id probably go with a smaller speedtech unit. Afterall the Pure stage two is still a hybrid. With how hard you work the car on the track the EGTs will get high with the stock manifold.
Also I would argue that the turbos speedtech uses are more reliable. Though it will cost more.
honestly, not going for world speed records..

Im not even looking to add meth or PI, just need to replace my broken turbo. If i get some more power, all good.


Ill pull some logs so you can see next time i go out.



Just found this on another msg board and loled...

Well you would loose boost infact no boost at all.
every time you tryed to boost you would get a stupid weuuuuuuuuuuuuuuuuuu sound
you would eventually start to smoke badly out the back..

I blew my turbo a few months back and thats what happened to me.

yes you still have vaccum and it would be its norman 25 driving and 20 when idle.

with no dv your car would run like shit.. you need that dv to release the pressure.
with a broken dv you would get a hisss at higher boost and your car would just be flat out weak.

hope that can help.


that weeuuuu sound is exactly what im getting..

xtreme power house has the best price in ps2 right now it seems. mike if you online, pm me.
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      01-29-2019, 11:24 AM   #17
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so to answer my question, How to tell if your turbo is dying?
  • Weuuuuuu sound without power
  • Oil levels low, get the add oil msg in I-drive
  • Smell - a burning smell of oil, something not right
    • loss of power- hard to determine, but if you feel its not the same, have it checked out
    • White or blueish smoke
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      01-29-2019, 11:38 AM   #18
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      01-29-2019, 11:42 AM   #19
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Quote:
Originally Posted by bryan_f22 View Post
the dinan one was sold, i woulda threw that one in.


ill probably throw a pure stage 2 in. If stock is going to be 2k, pure really isnt that much more for alot more power.
https://f30.bimmerpost.com/forums/sh...ighlight=Turbo

Check


https://f30.bimmerpost.com/forums/sh...ighlight=Turbo
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      01-29-2019, 11:43 AM   #20
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      01-29-2019, 11:47 AM   #21
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looks like pure stage 2 fellas...

should have some good data soon.


btw x-ph was almost $500 cheaper and free shipping vs ordering from pure directly.
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      01-29-2019, 09:08 PM   #22
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congrats dude. Looking forward to a review!
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