Eprom 87C257 in very old MSA

[Fec001]

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]

No, not possible.

[Fec001]

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]

Hi, where is your ori file

[dean 21]

Did you made only one eprom? in the other you have same maps, check it.

[mexanico1971]

does you rise the voltage pump ?!

[Fec001]

Yes pump voltage raised, in the other eprom only turbo maps, totally different content. I'll upload ori dumps

EDIT: Dumps uploaded

[Fec001]

dumps uploaded

[bobolin4o]

Have you achieved the desired values (IQ) in VCDS?
Edit: I think, you modified DW wrong...
Cheers!

DW.jpg

[Fec001]

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]

No problem...
The map is right, but the axises must be mirrored.
Cheers!



Y axis.jpg X axis.jpg Map prop..jpg

[Fec001]

Thank you!
That is the problem for sure. I'll try

[bobolin4o]

I wish you victory!
Regards!

[dean 21]

All maps are mirrored, on the one sometimes on the both axes. I made this ecu but it was long time ago.