Hi, I'm working on my new project of supercharged Alfa Romeo GTV 3.0V6.
Currently I'm in stage of learning the petrol Bosch Motronic ME 2.1 ECU principles. Any help on ME 2.1 documentation or map identification would be very welcome. Thank you.

Original ECU file - alfa-romeo-gtv-3-0v6-24v-t1443

I found these axis descriptors (decimal):

030 132
065 132
067 132
250 132

126 133

023 247
024 247
025 247
027 247
039 247

053 247 - RPM *40+0
054 247 - load ? *1+0 ?

252 246
253 246 - coolant *0.75-48 ?
254 246


And following maps (sorted by size):


078DB - 16x16 (x rpm)
05E97 - 16x16 (rpm x load)
05D6F - 16x16 (rpm x load)
054DB - 16x16 (rpm x)
053B3 - 16x16 (rpm x)
06D58 - 15x15
06E5E - 15x15
07523 - 32x6
07611 - 32x6
0709D - 16x10 (x rpm)
04FCB - 16x10 (rpm x)
064CB - 12x13 (rpm x)
06C93 - 8x16 (x rpm)
0684F - 8x16 // unclear descriptors
067B3 - 16x8
06703 - 16x8
06990 - 16x7 // unclear descriptors
06A90 - 16x7 // unclear descriptors
052EB - 8x16 (rpm x)
0623D - 12x7 (rpm x)
06192 - 9x9 (x rpm)
059E3 - 8x10 (x rpm)
057D1 - 8x10 (x rpm)
0583B - 8x10 (x rpm)
058A5 - 8x10 (x rpm)
0590F - 8x10 (x rpm)
05979 - 8x10 (x rpm)
05FB3 - 16x5 (rpm x)
06F4F - 16x5 // unclear descriptors
06329 - 8x9 (rpm x)
05737 - 8x8 // unclear descriptors
05777 - 8x8 // unclear descriptors
06653 - 8x8 // unclear descriptors
073E5 - 8x8 // unclear descriptors
073A5 - 8x8 // unclear descriptors
07365 - 8x8 // unclear descriptors
04EFD - 8x8 (rpm x)
04F69 - 8x8 (rpm x)
05C67 - 8x8 (rpm x load)
0513F - 8x8
05197 - 8x8
066A3 - 8x8 // unclear descriptors
0714D - 8x8 // unclear descriptors
0528F - 8x8
05C0F - 8x8 (rpm x load)
055F7 - 16x4 (rpm x)
0564F - 10x6
06387 - 8x7 (rpm x)
06067 - 8x7 (rpm x)
06019 - 8x7 (rpm x)
063D5 - 8x7 (rpm x)
06423 - 8x7 (rpm x)
074BF - 6x9 (x rpm)
0780B - 6x8
05BCF - 8x5 (rpm x)
05B93 - 8x5 (rpm x)
07A1B - 6x6 (x rpm)
07791 - 6x6 (x rpm)
07759 - 6x6 (x rpm)
07721 - 6x6 (x rpm)
0788F - 6x6 (x rpm)
051EB - 4x9
05367 - 6x6 (rpm x)
07A53 - 6x6 (x rpm)
05D23 - 6x6
060B3 - 6x6
065D1 - 8x4 // unclear descriptors
050BB - 8x4
05087 - 8x4
0C57E - 19x1
0C554 - 19x1
0C52A - 19x1
04DA1 - 16x1
06589 - 8x2
06631 - 16x1 (rpm)
0660D - 16x1 (rpm)
07490 - 15x1 (rpm)
07059 - 10x1
04F49 - 8x1 (rpm)
076DD - 8x1 (rpm)
076F1 - 8x1 (rpm)
07705 - 8x1 (rpm)
0646F - 8x1 (rpm)
06483 - 8x1 (rpm)
06847 - 8x1 (rpm)
07431 - 8x1 (rpm)
05B2B - 8x1 (rpm)
056C6 - 7x1
056D8 - 7x1
04E38 - 7x1
04E7E - 7x1
07A81 - 6x1 (rpm)
07A91 - 6x1 (rpm)
06D2D - 6x1 (rpm)
062AB - 6x1 (rpm)
0629B - 6x1
04ED9 - 6x1 (rpm)
04EC9 - 6x1 (rpm)
06F49 - 6x1 (rpm)
07443 - 6x1
07453 - 6x1
04EB9 - 6x1
07865 - 6x1 (rpm)
07875 - 6x1
07855 - 6x1 (rpm)
07845 - 6x1 (rpm)
0746F - 6x1 (rpm)
07461 - 4x1 (rpm)
07149 - 2x2 (x rpm)
06649 - 4x1
06C2F - 2x2 (x rpm)
068EB - 2x2 (x rpm)
068DB - 2x2 (x rpm)
0612D - 2x2 (x rpm)
0521F - 4x1
056A7 - 2x2
05697 - 2x2 (rpm x)
06493 - 4x1 idle speed (coolant) *10
0649F - 4x1
060DE - 3x1 (rpm)
074A6 - 3x1
07A9D - 2x1
06D21 - 2x1
06D19 - 2x1

40DC - Mass Air Flow linearisation in kg/h 512x1 Factor 0.08

5D6F - First Sprak advance map. Factor -0.75 offset 78.

X = Internal engine load calculated by the ECU in %. factor 0.05 precision 1
Y = RPM factor 40

This ECU has checksum and checksum module for its correction is very hard to get. How do you plan to correct it after you mod the maps?

Thanks RPM freak!
Are you sure about that engine load factor? Raw values are from interval <16,120>, so I would say they are right without any factor.
Regarding checksumming, I don't know yet to be honest. I'm not at that stage yet. I'll probably try the checksum corrector. In the worst case will do it manually using hexeditor checksumming plugin.

Yes i am sure about the factors.

Anyone can share original bin for 2.5V6 ME 2.1 ?

At what address fuel map is stored in ME2.1 ? What offset and factor I need to use?