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      06-28-2012, 05:25 PM   #1
Powerlift17
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E90 M3 Dinan ECM Software & Over Revving

I was recently shown by my dealer that my car hit 8715 RPM for 0.13 seconds a few months back. When I spoke with Dan at Dinan Technical Support he advised me that their software only controls over revving when the DCT is in neutral and that the DCT software controls me when in gear. Does anyone know if this is accurate and, if so, what does it mean in terms of the DCT software? Thank you all in advance.
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      06-28-2012, 05:28 PM   #2
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This could have also been a mechanical over rev. No way to know.
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      06-28-2012, 09:02 PM   #3
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Quote:
Originally Posted by THE TECH
This could have also been a mechanical over rev. No way to know.
I can understand a mechanical over rev on a manual transmission. How would it occur on a DCT?
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      06-29-2012, 02:38 AM   #4
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Quote:
Originally Posted by Powerlift17 View Post
I can understand a mechanical over rev on a manual transmission. How would it occur on a DCT?
It can't.

Dinan raises the redline to 8,600 RPM on DCT cars if I am not mistaken. The is also a byte that refers to a buffer for RPM intervention. It doesn't surprise me at all that with an 8,600 RPM set in the code, that you would be able to hit 8,715. My car has hit over that on a 6MT, and the DCT will be more prone to higher shifts over the factory set limit than a 6MT.

I have read stock DCT cars that have achieved over 8,450. I would by no means consider this an 'overrev' of any sort, but BMW will certainly blame anything they can on that.

It's not true that the DME software doesn't have any influence on where the DCT will shift.
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      06-29-2012, 10:37 AM   #5
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Quote:
Originally Posted by Mike Benvo View Post
It can't.

Dinan raises the redline to 8,600 RPM on DCT cars if I am not mistaken. The is also a byte that refers to a buffer for RPM intervention. It doesn't surprise me at all that with an 8,600 RPM set in the code, that you would be able to hit 8,715. My car has hit over that on a 6MT, and the DCT will be more prone to higher shifts over the factory set limit than a 6MT.

I have read stock DCT cars that have achieved over 8,450. I would by no means consider this an 'overrev' of any sort, but BMW will certainly blame anything they can on that.

It's not true that the DME software doesn't have any influence on where the DCT will shift.
Note to self - if BMW ever screws me; call Mike to be expert witness ; )

Great info.
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      06-29-2012, 12:17 PM   #6
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OP, i'm curious to why are you asking this question. Did you take the car in for routine service, or something abnormal occurred?
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      06-29-2012, 12:23 PM   #7
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Quote:
Originally Posted by Mike Benvo View Post
It can't.

Dinan raises the redline to 8,600 RPM on DCT cars if I am not mistaken. The is also a byte that refers to a buffer for RPM intervention. It doesn't surprise me at all that with an 8,600 RPM set in the code, that you would be able to hit 8,715. My car has hit over that on a 6MT, and the DCT will be more prone to higher shifts over the factory set limit than a 6MT.

I have read stock DCT cars that have achieved over 8,450. I would by no means consider this an 'overrev' of any sort, but BMW will certainly blame anything they can on that.

It's not true that the DME software doesn't have any influence on where the DCT will shift.
I have learned something new.

Looks like the DME will not allow a shift when it would go past the set redline. Guess that's a good thing when it comes to protecting the engine. Guess us 6MT guys just have to have some more skills
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      06-30-2012, 06:51 AM   #8
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Quote:
Originally Posted by Mike Benvo
Quote:
Originally Posted by Powerlift17 View Post
I can understand a mechanical over rev on a manual transmission. How would it occur on a DCT?
It can't.

Dinan raises the redline to 8,600 RPM on DCT cars if I am not mistaken. The is also a byte that refers to a buffer for RPM intervention. It doesn't surprise me at all that with an 8,600 RPM set in the code, that you would be able to hit 8,715. My car has hit over that on a 6MT, and the DCT will be more prone to higher shifts over the factory set limit than a 6MT.

I have read stock DCT cars that have achieved over 8,450. I would by no means consider this an 'overrev' of any sort, but BMW will certainly blame anything they can on that.

It's not true that the DME software doesn't have any influence on where the DCT will shift.
Mike,

Thank you for the detailed explanation. Much appreciated.

Rus Smith
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      06-30-2012, 07:00 AM   #9
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Quote:
Originally Posted by eatrach73
OP, i'm curious to why are you asking this question. Did you take the car in for routine service, or something abnormal occurred?
I got a beautiful display full of failure warnings when driving about 30 MPH on a side road. Car towed to BMW and after three days of trouble shooting it was determined that an exhaust valve spring on #1 cylinder had broken (at about 3,100 RPM). When I got the car back the report (50 pages, very detailed) indicated, amongst other things, that I had hit 8,715 RPM for 0.13 seconds.
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      06-30-2012, 10:31 AM   #10
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Quote:
Originally Posted by Powerlift17 View Post
I got a beautiful display full of failure warnings when driving about 30 MPH on a side road. Car towed to BMW and after three days of trouble shooting it was determined that an exhaust valve spring on #1 cylinder had broken (at about 3,100 RPM). When I got the car back the report (50 pages, very detailed) indicated, amongst other things, that I had hit 8,715 RPM for 0.13 seconds.
Wow... What ended up happening with this? Can you post the report?

These valve-springs should be good for a bit more than 8,700 RPM. My car has seen 8800 multiple times. How many miles were on the motor?
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      07-01-2012, 02:18 PM   #11
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0.13 seconds of over revving doesn't kill a valve-springs on these motors.
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      07-01-2012, 03:02 PM   #12
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Wow...overrev with a DCT?
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      07-01-2012, 08:37 PM   #13
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OP, did BMW cover it?
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      07-01-2012, 08:50 PM   #14
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i'm curious to why are you asking this question
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      07-01-2012, 09:20 PM   #15
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Could be that something broke here and BMW is blaming it on the s/w, looks like Dinan might have to pick up the tab on this one and that's not easy to achieve...this could end up in a battle. OP I hope you get taken care of
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      07-01-2012, 10:29 PM   #16
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I don't think a slight over rev would break a valve spring. If the rpm exceeded the limit of the spring it should just float. If it floats too long you have more problems. Sounds like just a weak spring from your story.

The electronics can slow the rpms, but they can't stop momentum. Which is most likely it just barely over revved.
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      07-01-2012, 10:32 PM   #17
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Quote:
Originally Posted by Mike Benvo
Quote:
Originally Posted by Powerlift17 View Post
I got a beautiful display full of failure warnings when driving about 30 MPH on a side road. Car towed to BMW and after three days of trouble shooting it was determined that an exhaust valve spring on #1 cylinder had broken (at about 3,100 RPM). When I got the car back the report (50 pages, very detailed) indicated, amongst other things, that I had hit 8,715 RPM for 0.13 seconds.
Wow... What ended up happening with this? Can you post the report?

These valve-springs should be good for a bit more than 8,700 RPM. My car has seen 8800 multiple times. How many miles were on the motor?
Mike,

I'm not 100% sure, but there's like 2 stages to the rev limiter in the software which you can see on INPA?
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      07-02-2012, 02:28 AM   #18
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Quote:
Originally Posted by Mbauer View Post
Mike,

I'm not 100% sure, but there's like 2 stages to the rev limiter in the software which you can see on INPA?
There are many different instances of RPM in the code - gear temp, oil temp, and coolant dependent limits and a couple other bytes that control ignition and injection cutoff.

Stock is limit is 8350 and 8450 hard cut (this is off the top of my head).
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      09-06-2012, 12:55 PM   #19
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What happened here? Did BMW cover it?
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