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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 07-12-2013, 02:22 AM
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New turbos need a break-in?

So I just got my turbos replaced under the extended warranty and I was wondering if there is a break-in period. Anyone know?
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  #2  
Old 07-12-2013, 04:56 AM
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  #3  
Old 07-12-2013, 07:15 AM
jburke4689 jburke4689 is offline
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There is no break-in.
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Old 07-12-2013, 07:22 AM
HPIA4v2 HPIA4v2 is online now
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Nope, but Mike Miller, BMW CCA tech-editor says warm-up and cool-down is a must for turbo engine. I never shut down my engine right of the bat on hot summer days. @51K-miles, tuned and hard driving my N54 never (or hasn't) develops waste-gate rattle. Knock-knock on woods.
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Old 07-12-2013, 11:19 AM
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Quote:
Originally Posted by angler View Post
Ask dealer
I asked, he said there should be, but he didn't know the process or for how long.

Quote:
Originally Posted by jburke4689 View Post
There is no break-in.
Can I ask where you heard that from? Just would rather be safe than sorry.

Quote:
Originally Posted by HPIA4v2 View Post
Nope, but Mike Miller, BMW CCA tech-editor says warm-up and cool-down is a must for turbo engine. I never shut down my engine right of the bat on hot summer days. @51K-miles, tuned and hard driving my N54 never (or hasn't) develops waste-gate rattle. Knock-knock on woods.
Oh I hear ya, I've been doing that for 4 years on this car. Usually keep it under 3k RPMS for the last 5-10 mins of the drive and vice versa when going out (also wait till temp is at least 240).
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Old 07-12-2013, 11:58 AM
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Any new rotating assembly should be broken in, just don't flog it for a few hundred miles.
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  #7  
Old 07-12-2013, 12:25 PM
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Originally Posted by bear-avhistory View Post
Any new rotating assembly should be broken in, just don't flog it for a few hundred miles.
This. Says as much in the owner's manual, too.
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Old 07-12-2013, 02:43 PM
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Any idea why your turbos failed?
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Old 07-12-2013, 02:50 PM
hondo402000 hondo402000 is offline
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my opinion is evey day you warm them up before you wind them up
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  #10  
Old 07-13-2013, 12:06 AM
sptt144 sptt144 is online now
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I thought you were supposed to wait until your oil temp kicks off the left hash mark. This way you know it is ready to lubricate those spinners properly. I always wait and keep it under 3k rpm. The JB4 also has an indicator option for this so you know when you can step on it so I have that activated as well.
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  #11  
Old 07-13-2013, 12:29 AM
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Quote:
Originally Posted by bear-avhistory View Post
Any new rotating assembly should be broken in, just don't flog it for a few hundred miles.
Thank you for the help! That's what I needed!

Quote:
Originally Posted by johnc_22 View Post
Any idea why your turbos failed?
Wastegate was staying slightly open and was not holding boost. I was covered under the extended warranty BMW put out (thank Jesus), otherwise It would have been a $5k repair with labor and parts.
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Old 07-13-2013, 05:27 AM
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Originally Posted by HPIA4v2 View Post
Mike Miller, BMW CCA tech-editor says warm-up and cool-down is a must for turbo engine.
This is correct. The problem with a hot shutdown is that the turbo is hot, but the oil flow ceases. So the oil left on the turbo's shaft begins to cook, leaving behind carbon deposits.

The usual solution is to take it easy for the last two minutes of your drive, putting along or idling, before shutting down.

The better solution is an after-oiler, which will keep oil moving through the turbo after the engine has shut down. This continued oil flow will carry the heat away from the turbo's center section, cooling it an preventing carbon buildup.

Frederic
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Last edited by TXFred; 07-13-2013 at 05:30 AM.
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  #13  
Old 07-13-2013, 07:04 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by Mk23 View Post
So I just got my turbos replaced under the extended warranty and I was wondering if there is a break-in period. Anyone know?

Engine break-in is, what, 600 mi? Don't go over 4500 rpm? I'd do that if I were you.

Wear surfaces....

What happened to your turbos?
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  #14  
Old 07-14-2013, 01:48 AM
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Quote:
Originally Posted by TXFred View Post
This is correct. The problem with a hot shutdown is that the turbo is hot, but the oil flow ceases. So the oil left on the turbo's shaft begins to cook, leaving behind carbon deposits.

The usual solution is to take it easy for the last two minutes of your drive, putting along or idling, before shutting down.

The better solution is an after-oiler, which will keep oil moving through the turbo after the engine has shut down. This continued oil flow will carry the heat away from the turbo's center section, cooling it an preventing carbon buildup.

Frederic

I already do the cool down/warm up period when driving home and heading out.

Any idea how much an after-oiler costs? Until just now I had no idea they even existed.

Quote:
Originally Posted by CALWATERBOY View Post
Engine break-in is, what, 600 mi? Don't go over 4500 rpm? I'd do that if I were you.

Wear surfaces....

What happened to your turbos?
I'm at 300 miles now and already flogged it a few times, hope that is okay... Figured 300 was enough since at the time I hadn't gotten an exact number. Also, see below.

Quote:
Originally Posted by Mk23 View Post
Wastegate was staying slightly open and was not holding boost. I was covered under the extended warranty BMW put out (thank Jesus), otherwise It would have been a $5k repair with labor and parts.
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  #15  
Old 07-14-2013, 06:44 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by Mk23 View Post
Wastegate was staying slightly open and was not holding boost. I was covered under the extended warranty BMW put out (thank Jesus), otherwise It would have been a $5k repair with labor and parts.

But why were they cracked?

OK, that's as outrageous as an IRS estimate o'taxes due. Guaranteed to strike fear in the very marrow of everyday citizens, IRS & its ilk have created and maintain the accounting profession. For that money they blueprint your engine.

Oh, and wastegate position can be manually adjusted; further adjusted in software. Without removing the engine.
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Old 07-14-2013, 07:58 AM
TXFred TXFred is offline
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Quote:
Originally Posted by Mk23 View Post
Any idea how much an after-oiler costs? Until just now I had no idea they even existed.
Here's one. Bear in mind, you would have to plumb it into your turbo's feed lines. And then you need an extra quart of oil at every change.

https://www.cantonracingproducts.com...O-AFTER-OILER/

Basically, it's a can with a single opening on the bottom, and it's full of air. When you start the car, oil fills up the can, leaving a bubble of compressed air at the top of the can. When you shut down again, the bubble forces the oil back out of the can and into the turbos. A check valve ensures that the oil doesn't flow backwards into the engine.

The one I linked to improves on the idea by using a bladder, so it can be mounted in any position. But if you can weld up an airtight container, you can build the simple version that I described.

I plan to build and install one at some point. I just have to decide how to plumb it into the car, and where to locate it. I'm thinking that I want to mount it someplace cool, so that when the car shuts down, the turbos get a shot of cool oil to help bring their temperatures down.

Frederic
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Old 07-14-2013, 10:30 AM
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You do know the car's electric coolant pump circulates coolant to the turbos after the engine shuts down (when necessary), right? For a street-driven car an after-oiler is pretty much overkill.
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  #18  
Old 07-14-2013, 12:23 PM
sptt144 sptt144 is online now
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Re: New turbos need a break-in?

Quote:
Originally Posted by Zeichen311 View Post
You do know the car's electric coolant pump circulates coolant to the turbos after the engine shuts down (when necessary), right? For a street-driven car an after-oiler is pretty much overkill.
The engine design explanation even says that it does this to prevent heat soak...I can hear it running sometimes after I shut down when its hot.

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Old 07-14-2013, 12:46 PM
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There is no break in needed for turbos.
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Old 07-14-2013, 01:46 PM
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Quote:
Originally Posted by Zeichen311 View Post
You do know the car's electric coolant pump circulates coolant to the turbos after the engine shuts down (when necessary), right? For a street-driven car an after-oiler is pretty much overkill.
This is true. The water cooling makes a big difference, especially when combined with the electric pump. Even without the pump, water should circulate by convection if the lines have been plumbed correctly.

Frederic
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