E90 M3 Dinan ECM Software & Over Revving

Powerlift17 · 06-28-2012, 05:25 PM

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.

THE TECH · 06-28-2012, 05:28 PM

This could have also been a mechanical over rev. No way to know.

Powerlift17 · 06-28-2012, 09:02 PM

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?

BPMSport · 06-29-2012, 02:38 AM

Quote:

Originally Posted by Powerlift17

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.

Singletrack · 06-29-2012, 10:37 AM

Quote:

Originally Posted by Mike Benvo

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.

positiveions · 06-29-2012, 12:17 PM

OP, i'm curious to why are you asking this question. Did you take the car in for routine service, or something abnormal occurred?

THE TECH · 06-29-2012, 12:23 PM

Quote:

Originally Posted by Mike Benvo

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

Powerlift17 · 06-30-2012, 06:51 AM

Quote:

Originally Posted by Mike Benvo

Quote:

Originally Posted by Powerlift17

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

Powerlift17 · 06-30-2012, 07:00 AM

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.

BPMSport · 06-30-2012, 10:31 AM

Quote:

Originally Posted by Powerlift17

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?

Soorena · 07-01-2012, 02:18 PM

0.13 seconds of over revving doesn't kill a valve-springs on these motors.

bigjae1976 · 07-01-2012, 03:02 PM

Wow...overrev with a DCT?

IFX · 07-01-2012, 08:37 PM

OP, did BMW cover it?

coelbenedict · 07-01-2012, 08:50 PM

i'm curious to why are you asking this question

edwinm3 · 07-01-2012, 09:20 PM

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

Mbauer · 07-01-2012, 10:29 PM

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.

Mbauer · 07-01-2012, 10:32 PM

Quote:

Originally Posted by Mike Benvo

Quote:

Originally Posted by Powerlift17

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?

BPMSport · 07-02-2012, 02:28 AM

Quote:

Originally Posted by Mbauer

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).

BIGW0RM · 09-06-2012, 12:55 PM

What happened here? Did BMW cover it?

06-28-2012, 05:25 PM	#1
Powerlift17 Private 6 Rep 58 Posts Drives: 2015 M4 Join Date: Apr 2012 Location: Phoenix, AZ iTrader: (0) Garage List 2015 BMW M4 [0.00]	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
THE TECH BimmerPost Supporting Vendor 307 Rep 13,093 Posts Drives: BPMsport 2012 E92 M3 Join Date: Jun 2011 Location: Kansas iTrader: (45) Garage List 2013 Nissan GTR [0.00] 2019 Sierra Denali ... [0.00] 1999 Nissan Silvia [0.00] 1999 Nissan Skyline ... [0.00] 1998 Toyota Supra [0.00]	This could have also been a mechanical over rev. No way to know.
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06-29-2012, 12:17 PM	#6
positiveions Lieutenant General 961 Rep 11,722 Posts Drives: 19 Tacoma, 16 Golf wagon Join Date: Sep 2007 Location: Upland, CA iTrader: (2) Garage List 2019 Toyota Tacoma [0.00] 2016 VW Golf Sports ... [0.00] 1998 BMW M3 [0.00] 1990 BMW 325is [0.00]	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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07-01-2012, 02:18 PM	#11
Soorena Captain 80 Rep 850 Posts Drives: M3 6MT Join Date: Dec 2011 Location: Paris iTrader: (0) Garage List 2013 BMW S1000RR [0.00] 2013 Ferrari 458 [9.66] 2012 Jaguar XJ SWB ... [10.00] 2011 E92 M3 [10.00]	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
bigjae1976 Major General 1570 Rep 8,075 Posts Drives: 11 E90 M3 Individual Join Date: Mar 2006 Location: Houston, TX iTrader: (22) Garage List 2004 BMW M3 [4.50] 2011 BMW E90 M3 [5.25] 2013 BMW 328i [5.00]	Wow...overrev with a DCT? __________________ 2018 F30 320iX Melbourne Red 2011 E90 M3 Monte Carlo Blue 2004 E46 M3 Imola Red 2000 E36/7 Z3 Steel Blue
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07-01-2012, 08:37 PM	#13
IFX Banned 67 Rep 2,536 Posts Drives: AW e46M/N54 Join Date: Jan 2009 Location: South Fla. iTrader: (1)	OP, did BMW cover it?
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07-01-2012, 08:50 PM	#14
coelbenedict New Member 0 Rep 6 Posts Drives: bmw Join Date: Jul 2012 Location: uo iTrader: (0)	i'm curious to why are you asking this question __________________
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07-01-2012, 09:20 PM	#15
edwinm3 Brigadier General 974 Rep 3,998 Posts Drives: F82 Join Date: Nov 2011 Location: Broward iTrader: (32)	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 __________________ Grigio Telesto M4, 6MT. Coyote 5.0 F-150 991 GT3
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07-01-2012, 10:29 PM	#16
Mbauer First Lieutenant 21 Rep 326 Posts Drives: E92 187outx3 Join Date: Dec 2011 Location: So Cal iTrader: (1)	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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09-06-2012, 12:55 PM	#19
BIGW0RM You got my money? 3090 Rep 4,630 Posts Drives: Ice Cream Truck Join Date: Jul 2011 Location: ///OC iTrader: (14) Garage List 2022 BMW M3 [9.50]	What happened here? Did BMW cover it?
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