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Old Fri, Oct-04-2013, 02:24:24 PM   #1
SliM3
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Default CSL SMG Engine Parameters (DME)

In conjunction with Obioban's thread New (awesome) DIY programmable option: CSL launch control and shifting (SMG), which includes terraphantm's DIY pdf, I wanted to share the other half of this awesome mod for all us SMG folks.

Just a little background for those that aren't too savvy with SMG functionality, the above SW re-flash is designed to take advantage of the more aggressive and faster CSL SMG controller shift logic.

Since gear shifts are a timed synchronous event between both DME and SMG controller, to really take advantage of true CSL shifting we need to address the engine controlled portion of the event. What we end up with is around 18 maps that need to be snatched from the CSL engine SW, overwriting your current maps.

First are the up-shift recognition maps that establish values based on driver demand torque (you pressing the gas) & engine speed for both Comfort and Sport modes. There's one each for regulated speed control, gear change, and full turn-on (torque ramp) for a total of six.

The next set of maps are for downshifting, with their values based on deceleration rate (fps) and engine speed. Total of six as well.



The next, more important set of maps, control the actual timing of engine speed regulation and torque ramp-up based on the recognition maps above. These also work in conjunction with the faster SMG controller logic to really shorten that timed synchronous shift event. To put it in perspective, shift logic '3' on this set-up feels more like shift logic '5' on normal ///M's.

Of note, eng. speed regulation is the same between normal ///M's and the CSL, however the torque ramp-up time is considerably shortened, nearly cut in half in some areas.
CSL


Normal Ramp-up



These maps took a bit of figuring out but they are the ever-so-popular rev-match parameters. They serve as an applied percentage to target engine speed based on deceleration rate (fps) and current rpm. As you can see the normal maps top out around 60% applied engine speed, while the CSL tops out @ 100% applied engine speed. Also, the target engine speed threshold is referenced via a 3x0 function map with 400, 500 & 1000 rpm values.

CSL
Note: My Sport map is modified but normally both these maps are identical.


Normal ///M


Driving Impressions:

I will try and get a video up this weekend, but for the most part the shift event is brutally fast and aggressive in logic '5' & '6'. It requires a bit of throttle finesse in the lower gears 1>2 and 2>3, but an engine screaming shift from 3rd to 4th feels incredible. There's no delay nor loss of torque so the car just pulls and pulls. Guys with SC's or turbo's will love this, and might even gain an edge on a head-up race between a comparable 6MT. My feeling is that, if you were ever unimpressed with the SMG's shift performance, this will quickly change your perspective.

I can assist anyone who might be interested in rolling with this upgrade, just shoot me a PM.



* * * * * U P D A T E * * * * *
April 8, 2014

I've got a little update that should help improve acceleration after gear changes and deal with high rpm/load clutch slip some folks are experiencing.

The subject parameter is KL_SMG_MOT_J_MOTOR:

What is it?
It's the Mass Moment of Inertia at various engine speeds, in newtons divided by meters per second squared.


Why do we need it?
It quantifies the required torque needed to change angular velocity of pretty much the entire drive line, from the flywheel to the rear wheels.


How is it used in calculation?
It is multiplied by the speed gradient (angular velocity) of the engine, which is rpm/sec -or- radians a second.

So for instance, let's say our speed gradient is 550 rpm/sec (31,625 degree's crank rotation; 87 revolutions per second; 5270rpm) When we apply a mass moment of 0.27 <--(S54 standard value) we come up with the following:
550 * 0.27 = 148.5 Nm required to change angular velocity. There are other values that are added as well that account for drag torque & consumer torque (AC compressor, alternator, H2O pump, etc.).


Sequential M-Gearbox II_MOTOR INERTIA



The above pic shows the difference between standard & euro ///M's, and the CSL. As you can see, after about 3200 rpm the value drops considerably while the CSL is still climbing.

So let's quantify the effects of the differences by using the math formula above.
CSL:
1520 = 17.38 Nm
3000 = 125.22 Nm
6000 = 313 Nm

Standard and Euro:
1520 = 3.17 Nm
3520 = 73.46 Nm
5000 = 62.61 Nm

To incorporate the CSL parameters search for the following hex string:
Code:
03 00 26
In 32 bit files it should fall right around 0x1C-- or thereabouts; For 64 bit it's around 0x2B--

Overwrite the existing hex with:
Code:
03 00 26 4B 96 01 33 40
Correct checksum and re-flash.
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- Checksum corrections for modified DME partial & full bin files

- CSL SMG Engine Parameters (DME) by Slim

- Fuel adaptations explained

- Checksum Verification

Last edited by SliM3; Tue, Apr-08-2014 at 03:53:48 PM.
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Old Fri, Oct-04-2013, 02:40:11 PM   #2
terraphantm
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Default Re: CSL SMG Engine Parameters (DME)

Amazing work!

Shouldn't be too difficult to make a program that automates those changes... let me get started on that.
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Old Fri, Oct-04-2013, 02:42:43 PM   #3
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Default Re: CSL SMG Engine Parameters (DME)

Quote:
Originally Posted by terraphantm View Post
Amazing work!

Shouldn't be too difficult to make a program that automates those changes... let me get started on that.
Sure thing terra. Ping me if you need any reference points or anything like that
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Old Fri, Oct-04-2013, 03:04:11 PM   #4
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Default Re: CSL SMG Engine Parameters (DME)

Fantastic work!! Having been running the CSL software for some time now, I can attest for the amazing transformation the smg makes, using these parameters!

to you sli!
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Old Fri, Oct-04-2013, 03:21:48 PM   #5
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Default Re: CSL SMG Engine Parameters (DME)

Great work. Although I'm a 6MT, I can appreciate the time and effort put into all of this.

BTW, is your name Sli M3, or 'slime'? Just curious
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Old Fri, Oct-04-2013, 03:33:36 PM   #6
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Default Re: CSL SMG Engine Parameters (DME)

Quote:
Originally Posted by gojcaj View Post
Great work. Although I'm a 6MT, I can appreciate the time and effort put into all of this.

BTW, is your name Sli M3, or 'slime'? Just curious
Thanks gojcaj & Abad46.

It's actually 'slim-three'; cause of my slender build. LOL

EDIT: Abad have you noticed any change to SMG pump duty cycles at all with your set-up? ie. pump turning on more often to keep accumulator charged.

Last edited by SliM3; Fri, Oct-04-2013 at 03:55:13 PM.
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Old Fri, Oct-04-2013, 03:53:04 PM   #7
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Default Re: CSL SMG Engine Parameters (DME)

Nicely done!
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Old Fri, Oct-04-2013, 04:39:10 PM   #8
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Default Re: CSL SMG Engine Parameters (DME)

Will any of these parameters change if you have 3.91 gears?
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Old Fri, Oct-04-2013, 05:00:54 PM   #9
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Default Re: CSL SMG Engine Parameters (DME)

Quote:
Originally Posted by x Spades x View Post
Will any of these parameters change if you have 3.91 gears?
That's a good question x Spades x, and I'm not absolutely sure about that. If anything I can see your 'coasting' decel rates (foot off gas; downshift) being a little higher because engine drag torque would have a greater effect on the higher ratio gear, same as acceleration. But, that's why we have this nice little constant to play around with

Rear Gear Ratio
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Old Fri, Oct-04-2013, 07:48:03 PM   #10
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Default Re: CSL SMG Engine Parameters (DME)

So you are saying I timed my SMG reflash perfectly to remove the ESS stuff.
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Discussing CSL SMG Engine Parameters (DME) in the Coding and Tuning Forum - Discuss all avenues of coding and tuning here! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)