Thanks to everyone for the input, much appreciated
I'm sorry @Turdo2
, but right now I've gotta disagree that EGS 52 TCU
knows no difference, I am 99.999999999999% certain it will throw a "Ratio Error" and go into limp mode if the Transmission Ratios don't match, same as it will throw limp errors if the Diff Ratio doesn't match it's coding, I don't know if earlier pre facelift / 4 cylinder TCU's are different
I am talking EGS 52 here, as fitted to R170 V6 Cars
Years, like many many years ago, when we were rebuilding 722.6's all day long, we initially tried swapping slightly different Gearsets and every time the Cars EGS 52 TCU went into limp mode and reported ratio errors.
What I will do just to treble check if I am wrong, if and when I fit a V8 Tranny in my Car, I'll test it first without re coding the TCU
Anyways back to todays research plot.............
I've run the part numbers...................
Here are the ones I'm concerned with for V6 to V8 Conversion ......................
R170 32 Kompressor Transmission is the same part number as W220 V8, as are the internal gearsets.
So with a 3.07 Diff Ratio, we can use either a standard factory SLK 32 TCU, (might be a bit thin on the ground good used), or with SDS we can Version Code the 320 V6 Cars EGS 52 with SLK32 Coding.
One of the W202 Diffs is the same as R170 SLK 32 , p/n A 202 350 97 14 , also easier to get (in UK) is from a C 250 TD , 3.07 ratio, p/n A 202 350 62 14 which looks to be the same casing, again, the R170 V6 Shafts should fit.
There is also the W203 C220 CDI Diff which I think will bolt into the R170 V6, use the same Shafts, this has the 2.87 Ratio, same ratio
as the W220 but the W220 diff Casing is huge and will not fit R170, I've already looked / measured my W220 to see if that was an option
I will examine the Diff in Mels C220 CDI, shape mounts etc, I can get them easy and cheapish in UK.
So the nuts of it is if you want to use the V6 Komp / V8 W220 Transmission for strength, then if using 3.07 Diff use SLK 32 Coding in V6 TCU, if using the 2.87 Diff then use W220 TCU or it's Coding. If using the 3.27 320 diff we'll have to see if that guy I know can do the custom coding for V8 Trans / 3.27 Diff Combo, or use the 320 V6 Trans, Diff and TCU.
When I install the V8 in my 320 I will initially be using the V6 Trans with the 3.27, later down the line I might do swapsies especially if it lunches the V6 Tranny.
I'll copy the info into my thread in Performance Modification
Cheers for now, Dave