75 3.0L Vs Potenziata

[bteoh]

Thanks for the info. Will check out what I have in mine.

With regards to finding out which chip I have, do I have to remove the ecu housing to check the chip? Or should it be labelled somewhere on the outside?

[festy]

If you're lucky, your ECU might have the chip number or ID on it.
It will have the ECU hardware # (0.261.200.141) but the chip numbers/IDs would be one of:
1.267.356.097 or BF43
1.267.355.737 or 9AE3
(or it might just have something like "356-097" or "737" etc.

Failing that, you've got 3 options if you want to find out which chip you have.
1) Open up the ECU, or
2) A $15 ebay diagnostic cable and read the chip ID with a laptop (this cable will also let you read/clear error codes, datalog, read sensors etc) - or
3) Run a wire from ECU pin 11 to ground, go for a quick drive and see if there's a dramatic performance increase
(This switches the ECU to the "alternate car personality" which in the 097 chip is the SZ configuration - you'll know pretty quickly if you have this chip!)

[brook308]

My September 1990 Potenziata has the 097 chip. Do you know what the differences were in the two maps on those chips?

Here's an example of two fuel maps - one is the 75, the other is the SZ.
You can see that the SZ map is a good deal richer - and not very smooth which indicates the map probably didn't go through the same long-winded tuning development process as the more production orientated 75 version.

Featy just curious as to where you got this info from?

[festy]

Featy just curious as to where you got this info from?

I spent a year or three reverse-engineering the ML4.1 Motronic system - working out what they do, how and why they do it.
From there I was able to write some definition files for a program called Tuner Pro, which is what I was using to display those fuel maps.

[brook308]

If you're lucky, your ECU might have the chip number or ID on it.
It will have the ECU hardware # (0.261.200.141) but the chip numbers/IDs would be one of:
1.267.356.097 or BF43
1.267.355.737 or 9AE3
(or it might just have something like "356-097" or "737" etc.

Failing that, you've got 3 options if you want to find out which chip you have.
1) Open up the ECU, or
2) A $15 ebay diagnostic cable and read the chip ID with a laptop (this cable will also let you read/clear error codes, datalog, read sensors etc) - or
3) Run a wire from ECU pin 11 to ground, go for a quick drive and see if there's a dramatic performance increase
(This switches the ECU to the "alternate car personality" which in the 097 chip is the SZ configuration - you'll know pretty quickly if you have this chip!)

OK so I measured pin 11 of my potenziata ECU and it already has an earth on it.
I measured at the connector with the ecu disconnected.

So unless this potenziata loom was modified at some stage it  is always in "alternate personality mode".