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Old Mon, Jul-22-2019, 11:56:54 AM   #691
Olza
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Default Re: Comprehensive MSS50 DME information (Euro E36 M3 S50B32 321 PS)

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Originally Posted by VincentM3E36 View Post
Ok I will try to do some test soon.

I also try to calculate one of the input of the alpha N map (maybe aq_rel or tps I don't know). I've found this formula in the code :

aq_rel[k] = (((FFF71E[k] * FFC710[k])/512 (K_46304 + 3) * 4) * 87/64)/4

but I haven't found yet what are FFF71E and FFC710...
FFF71E - raw TPS AD data. FFC710 not sure, some kind of heat extension factor from engine temp .C_TPS_MAX_IS_byte_46304 - max idle throttle potentiometer adaptation threshold.
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Old Fri, Jul-26-2019, 08:38:48 PM   #692
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Default Re: Comprehensive MSS50 DME information (Euro E36 M3 S50B32 321 PS)

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Originally Posted by Olza View Post
FFF71E - raw TPS AD data. FFC710 not sure, some kind of heat extension factor from engine temp .C_TPS_MAX_IS_byte_46304 - max idle throttle potentiometer adaptation threshold.

Do you know on how many bits the potentiometer voltage (0-5V) is acquired by the dme ? Maybe 10 bits (0->1023 raw data) ?

Last edited by VincentM3E36; Fri, Jul-26-2019 at 10:36:45 PM.
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Old Fri, Jul-26-2019, 10:37:44 PM   #693
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Default Re: Comprehensive MSS50 DME information (Euro E36 M3 S50B32 321 PS)

MSS54 is 10-bit, I imagine imagine MSS50 is similar in that regard.
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Old Sat, Jul-27-2019, 02:40:02 PM   #694
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Default Re: Comprehensive MSS50 DME information (Euro E36 M3 S50B32 321 PS)

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Originally Posted by terraphantm View Post
MSS54 is 10-bit, I imagine imagine MSS50 is similar in that regard.
It is consistent with potentiometer voltage in the DIS which varies every approximately 5mV

Last edited by VincentM3E36; Sat, Jul-27-2019 at 03:26:06 PM.
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Old Sat, Jul-27-2019, 05:03:51 PM   #695
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Default Re: Comprehensive MSS50 DME information (Euro E36 M3 S50B32 321 PS)

I ploted the input of the alpha map when analogic TPS voltage varies from 0 to 5V acquired on 10 bits thanks to the formula I found in the program. I keep stock value of C_TPS_MAX_IS = 46 and no heating compensation : FFC710 = 512 (pic 1). It is very consistent with the input of the alpha N map when you let the input in raw data (pic 2). The only strange things is this C_TPS_MAX_IS value because the input of the map starts to become different from 0 only when TPS voltage is upper 1V. It is not possible to have load signal equal to 0ms under 1V (when maf is removed).

My maf is removed and DIS shows load values between 1 and 2ms under TPS = 1V
Attached Images
File Type: png Alpha N input.png (17.9 KB, 12 views)
File Type: png Alpha N map.png (14.3 KB, 16 views)
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Old Fri, Aug-09-2019, 03:51:19 PM   #696
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Default Re: Comprehensive MSS50 DME information (Euro E36 M3 S50B32 321 PS)

I am going to answer my own question : the right formula is :

aq_rel[k] = (((FFF71E[k] * FFC710[k])/512 – FFC692[k]/64) * 87/64)/4

where FFC692 must be the current idle throttle potentiometer adaptation and C_TPS_MAX_IS is the max idle throttle potentiometer adaptation that the DME allows.

So I think the idle throttle potentiometer adaptation can vary in the range 0-1V. My plot above corresponds to the maximum of the idle throttle potentiometer adaptation.

Last edited by VincentM3E36; Wed, Aug-14-2019 at 07:38:19 PM.
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Old Tue, Sep-10-2019, 01:10:31 AM   #697
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Default Re: Comprehensive MSS50 DME information (Euro E36 M3 S50B32 321 PS)

Hi All, just closing some posts and an update.
After much tinkering and looking for the problems with the LTFT - it appears that after all it was a faulty TPS! voltage from .6 through to 1.1 were reading incorrectly so part throttle was running super rich under medium load. with a new TPS LTFT values came back to about +1.2%

this still has not explained the high fuel consumption though (which is still present)

I also went down the path of a new Alpha-N tune that was provided to me by a very patient and awesome member on this forum. the tune is great and car feels very strong in the mid range now.

i may do some "back yard" tuning on Vanos and ignition but am still a little cautious on how far i can move the Vanos cam values. . .

So in short , LTFT values are sorted!

however car is still using lots of fuel in the city - consumption is about 390km to a full 60L on the highway i can get 580-600kM to 60L


Now moving on to my question. . .

Does anyone have any ideas or suggestions on how to get DTM style exhaust flames on decell.???

i was thinking of just adding more fuel in the 05 and 08 range on part throttle map in the high rpm and also retarding timing slightly ? would this get the flames or would i blow something up ?? haha
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Old Thu, Sep-19-2019, 07:50:59 AM   #698
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Default Re: Comprehensive MSS50 DME information (Euro E36 M3 S50B32 321 PS)

To get this flames you need three things:
1. Fuel when throttle nearly closed,
2. retard Ign. in specific area under specific conditions (mostly -16 up to -23 degress works well),
3. more air in this condition (can be done via icv).
(4. decat, better straight exhaust and hot enough engine).
Its nearly all time the same way for pop and bang, flames...
Problem often are rev hanging... can be adjust by other values for deceleration tables.

But why would you do this to a great engine like S50 be...
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Discussing Comprehensive MSS50 DME information (Euro E36 M3 S50B32 321 PS) 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)