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View Full Version : Eprom 87C257 in very old MSA



Fec001
25th February, 2014, 12:46 PM
Hello!
I have a question.
Is the 87C257 interchangeable with 27C256. I made a mod file for first eprom, car starts but it doesn't have idle (stops if don't press pedal) and very strong timing, no RPM needle working. I think mod is ok

Zmann
25th February, 2014, 01:07 PM
No, not possible.

Fec001
3rd March, 2014, 12:51 PM
Thanks Zmann. Erased original eprom write, mod and car runs fine. But not exactly how I want. There is no smoke (or just some).
I think something limiting the IQ but somke limiter, TL and DW are modded. If someone knows this type of ECU, please check my mod.
Car is Audi 80 1.9 tdi 90HP MY 92

dean 21
3rd March, 2014, 05:02 PM
Hi, where is your ori file

dean 21
3rd March, 2014, 06:17 PM
Did you made only one eprom? in the other you have same maps, check it.

mexanico1971
3rd March, 2014, 07:02 PM
does you rise the voltage pump ?!

Fec001
3rd March, 2014, 10:09 PM
Yes pump voltage raised, in the other eprom only turbo maps, totally different content. I'll upload ori dumps

EDIT: Dumps uploaded

Fec001
3rd March, 2014, 11:19 PM
dumps uploaded

bobolin4o
5th March, 2014, 08:15 AM
Have you achieved the desired values (IQ) in VCDS?
Edit: I think, you modified DW wrong...
Cheers!

248695

Fec001
5th March, 2014, 10:02 AM
I didn't check the desired IQ with diag yet. Next week I'll get the car not only the ECU and can try it.
You are right, I marked off DW wrong 07316. can you show me map properties of yours???

bobolin4o
5th March, 2014, 11:35 AM
No problem...
The map is right, but the axises must be mirrored.
Cheers!



248714 248715 248718

Fec001
5th March, 2014, 11:46 AM
Thank you!
That is the problem for sure. I'll try

bobolin4o
5th March, 2014, 11:58 AM
I wish you victory!
Regards!

dean 21
5th March, 2014, 04:59 PM
All maps are mirrored, on the one sometimes on the both axes. I made this ecu but it was long time ago.