75 3.0L Vs Potenziata

Started by Beatle, February 24, 2012, 11:25:37 PM

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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 ;D
(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

Quote from: festy on September 20, 2012, 11:00:30 AM
Quote from: oz3litre on September 20, 2012, 10:48:23 AM
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

Quote from: brook308 on August 02, 2014, 03:06:04 PM
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

Quote from: festy on September 21, 2012, 09:42:12 AM
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 ;D
(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".