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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > so i had a discussion with a friend of mine about turbos...



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      04-22-2009, 08:36 PM   #1
dpwr
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so i had a discussion with a friend of mine about turbos...

about how in a long run around 100,000 miles 335 turbos might have some issues and might need to be rebuild or replaced (my point of view)... he's saying how turbos (turbo cars in general) are very reliable and nothing will go wrong with them and they will not fail or need rebuilding/replacing... who is right here ?
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      04-22-2009, 08:38 PM   #2
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depends on driving habits


1) floor it at all times never let the car rest

2) drive like grandma


any car can last over 200 grand if you treat it right
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      04-22-2009, 08:41 PM   #3
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Both of you are right!
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      04-22-2009, 08:43 PM   #4
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      04-22-2009, 08:46 PM   #5
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what is the logic behind you asking this question?
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      04-22-2009, 08:52 PM   #6
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it depends.
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      04-22-2009, 08:56 PM   #7
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I would say that a turbo's failure rate is somewhere between the tranny and AC compressor...i.e. for some people they never fail but for others they go out between 70-150K I would say...but how hard you are on the car plays a huge role
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      04-24-2009, 11:01 AM   #8
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Quote:
Originally Posted by dpwr View Post
about how in a long run around 100,000 miles 335 turbos might have some issues and might need to be rebuild or replaced (my point of view)... he's saying how turbos (turbo cars in general) are very reliable and nothing will go wrong with them and they will not fail or need rebuilding/replacing... who is right here ?
A large single that isn't ever boosting beyond peak efficiency, should be good for the life of the car.

things to look out for :

- if your oil pump goes out while you're boosting, you stand a good chance of damaging the turbos. If you're not BB, then you're practically guaranteed some damage.

- if you drive super hard, and immediately turn the car off (without giving it at least a small cool down period), you can bake the turbos in their oil.

- if you ingest crap into your intake, it stands a good chance of not just 'blowing through' like it would in an NA engine. foreign object damage is a real deal.

-scheherazade
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      04-24-2009, 11:05 AM   #9
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the oil pump still runs the oil through the turbos even when shut down. no need to wait before shutting down.
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      04-24-2009, 11:21 AM   #10
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Quote:
Originally Posted by enrita View Post
the oil pump still runs the oil through the turbos even when shut down. no need to wait before shutting down.
False. The COOLANT pump runs when shut down. Unless there's something I don't know.
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      04-24-2009, 11:24 AM   #11
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do you really think that BMW would make a turbo car that could run into this kind of troubles? These are new engines , not an Escort cosworth from the 90s...
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      04-24-2009, 11:33 AM   #12
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This is all true but the BMW engineers created the LIMP MODE which will take care of most of these contingencies and more.

If you have a little too much fun at the track you will get LIMP or reduced power either way before you put the engine in harms way.

Quote:
Originally Posted by scheherazade View Post
A large single that isn't ever boosting beyond peak efficiency, should be good for the life of the car.

things to look out for :

- if your oil pump goes out while you're boosting, you stand a good chance of damaging the turbos. If you're not BB, then you're practically guaranteed some damage.

- if you drive super hard, and immediately turn the car off (without giving it at least a small cool down period), you can bake the turbos in their oil.

- if you ingest crap into your intake, it stands a good chance of not just 'blowing through' like it would in an NA engine. foreign object damage is a real deal.

-scheherazade
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      04-24-2009, 12:15 PM   #13
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Quote:
Originally Posted by dpwr View Post
about how in a long run around 100,000 miles 335 turbos might have some issues and might need to be rebuild or replaced (my point of view)... he's saying how turbos (turbo cars in general) are very reliable and nothing will go wrong with them and they will not fail or need rebuilding/replacing... who is right here ?
A stock BMW 335 with the elec water pump run-on after engine off and using synthetic oil should last to 100k or beyond but since not many of these cars are likely close to that yet, we'll see.

With tunes spinning the turbos to their max RPM it's probably a safe bet that they'll at least be a little loose on bearing clearances by 100k if not worse. Depends on how hard you beat on them- I'm a little concerned about when cold and lubrication isn't optimal. Up here in CT during winter, it takes my car a good 15 minutes of easy driving for the oil temp to get past 200'F in my 335XI. Not much time to beat on it since my commute is only about 22min.

When I get a tune, the warm-up performance re the turbos is concern for me.
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      04-24-2009, 06:07 PM   #14
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Quote:
Originally Posted by enrita View Post
do you really think that BMW would make a turbo car that could run into this kind of troubles?
Yes (HPFP)
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      04-24-2009, 06:31 PM   #15
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Depends too if you've modded the engine to run at a higher boost. That will definately shorten the life of those little hair dryers.
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      04-24-2009, 07:08 PM   #16
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Read this thread: http://www.e90post.com/forums/showthread.php?t=202810

Any car, turbo or not, will fail if not maintained well. You'd be surprised how many cars out there are taken care of like crap. The biggest question isn't if the engine will last, it's if the person who owns it will take good enough care of it.

This is especially true if you're running higher boost. In my opinion, the turbos can handle the higher boost (to certain levels of course) but the longevity of the turbos doesn't depend on just the turbos themselves. You then have to compensate for the higher heat being produced by upgrading the intercooler and oil cooler etc. Stock boost is not the maximum level they can be taken to, car manufacturers will always keep it a few levels below what they can really handle to be on the safe side since they have to warranty their cars. Stock boost is the maximum level at which the manufacturer feels safe enough to release the car with and the level at which they feel safe enough that their parts can cool down fast enough.

Take computers for example: Sure, you can overclock your processor but it's going to last so much longer and be so much more reliable if you upgrade your cooling system as well. Heat is the biggest enemy of all things mechanical.
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      04-25-2009, 07:32 AM   #17
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If you don't overboost your turbo's all the time, and at thresholld levels your turbo seals should not fail for a long time. Could be for the life of the car. But changes are, these days, anyone that has a turbo car is going to do some kind of mods. Also - when you are overboosting, not only are you in danger of harming your turbos, but you also are in danger of detonating your engine, which could cost a lot more than just replacing turbo's.
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