335i - Turbos Failing?
Discussion
Hi All,
I have an 07 e93 335i with 67k on the clock and what are the factory fit turbos, its also never been walnut blasted but all other maintenance has been done by the book at BMW.
I get the feeling that something isnt right with the turbos for two reasons, firstly I have heard a very feint chattering type noise between 2-3k when I am driving which makes me think its the famous wastegate issue albeit I cant reproduce the sound when the car is idling.
Secondly I have never ever managed to break traction with DTC completely off, launching it in 1st (its the zf auto) it just lazily comes to life and then takes off as I would expect around 2.5krpm onwards. This was on a private road and even brake boosting it couldnt break traction. I don't think its due to me having amazing tyres either. My friend in a 320i managed to break traction with minimal effort.
Does this sound like the turbos are on their way out?
Thanks!
I have an 07 e93 335i with 67k on the clock and what are the factory fit turbos, its also never been walnut blasted but all other maintenance has been done by the book at BMW.
I get the feeling that something isnt right with the turbos for two reasons, firstly I have heard a very feint chattering type noise between 2-3k when I am driving which makes me think its the famous wastegate issue albeit I cant reproduce the sound when the car is idling.
Secondly I have never ever managed to break traction with DTC completely off, launching it in 1st (its the zf auto) it just lazily comes to life and then takes off as I would expect around 2.5krpm onwards. This was on a private road and even brake boosting it couldnt break traction. I don't think its due to me having amazing tyres either. My friend in a 320i managed to break traction with minimal effort.
Does this sound like the turbos are on their way out?
Thanks!
Luckyone said:
I’m surprised your friend was able to easily break traction in a 320i, was it a manual? I assume you were trying on the very same bit of private road? As I said our E39 touring 530i goes very well but it doesn’t tend to break traction, not that I have tried that much really. Depends on definitions though the 530i will certainly trouble the tyres but my definition is huge 11s all the way up the road with masses of smoke if your really trying!
That my only issue with properly fast BMWs you have to intentionally disable the traction control to spin the wheels. The BIB have always been very good natured if they spot me braking traction in the 200sx or Cerb they are nearly all all petrol heads them selves & understand it’s easy to accidentally brake traction in those with no traction control.
We had a quite new 640d a while ago, that did easily brake traction gliding gracefully sideways out of junctions (with the TC off!) but you have to make sure it’s really is on a private road.
Back to your point, though I’ll try a bit harder to see if mine can brake traction when its back together. I would assume it should really.
In the meantime can you not plug in some hand held code scanner to see if it shows boost pressure? I think mine should, I’ll try that too when it’s working again.
Yep, same road and he does have a manual.That my only issue with properly fast BMWs you have to intentionally disable the traction control to spin the wheels. The BIB have always been very good natured if they spot me braking traction in the 200sx or Cerb they are nearly all all petrol heads them selves & understand it’s easy to accidentally brake traction in those with no traction control.
We had a quite new 640d a while ago, that did easily brake traction gliding gracefully sideways out of junctions (with the TC off!) but you have to make sure it’s really is on a private road.
Back to your point, though I’ll try a bit harder to see if mine can brake traction when its back together. I would assume it should really.
In the meantime can you not plug in some hand held code scanner to see if it shows boost pressure? I think mine should, I’ll try that too when it’s working again.
It just feels completely flat from standstill till about 3k where it comes to life.
I haven't got any fault codes or anything, however I do have a dcan cable so I could check boost pressure - Is there any particular app you recommend?
Luckyone said:
It is a lot easier to get a manual to spin the wheels as you have all the momentum of the flywheel to suddenly release but still I’d have thought a 335i auto still should be able to spin them really. I’m interested to see if mine will now!
I haven’t looked into the workings of the N54 very much yet. I would imagine the DME can see the boost pressure of each turbo, would make like much easier for you if it can. Assuming it has got a smaller turbo for lower RPMs it sounds like its not getting to pressure for some reason (possibly the rattle) If you can see the pressure of each turbo separately it should obvious if one isn’t making good pressure.
The DME may only be able to see a single MAP sensor that would make it harder.
Mine had a vacuum line hanging off when I got it & there were no error codes showing for that. I put new vacuum lines on it & it seemed to get progressively faster. I think it takes time for the adaptives to learn changes if it works like the M54s DME.
I assume you have checked all your vacuum lines & anything else obvious?
Sorry can’t help with what app to use but anything that can read boost really.
I have INPA but its only the cable for the older M54, I have got a hand held reader that shows live data that will work. That can show readouts on a graph, it can be easier than trying to look at readouts when flooring it!
Well I dropped the car off to BMW on Saturday and they phoned back to say they have tested the turbos and there is no issue there, all in working order but they agreed there is a massive flat spot below 3k.I haven’t looked into the workings of the N54 very much yet. I would imagine the DME can see the boost pressure of each turbo, would make like much easier for you if it can. Assuming it has got a smaller turbo for lower RPMs it sounds like its not getting to pressure for some reason (possibly the rattle) If you can see the pressure of each turbo separately it should obvious if one isn’t making good pressure.
The DME may only be able to see a single MAP sensor that would make it harder.
Mine had a vacuum line hanging off when I got it & there were no error codes showing for that. I put new vacuum lines on it & it seemed to get progressively faster. I think it takes time for the adaptives to learn changes if it works like the M54s DME.
I assume you have checked all your vacuum lines & anything else obvious?
Sorry can’t help with what app to use but anything that can read boost really.
I have INPA but its only the cable for the older M54, I have got a hand held reader that shows live data that will work. That can show readouts on a graph, it can be easier than trying to look at readouts when flooring it!
They will be checking the injectors next and updating me in due course.
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