aan eproms

[pasbogdan]

I played with my original fuel eprom and broked a pin.I downloaded the stock softwares for aan(a link was on this forum) and writed the fuel/ignition eprom with a willem.
The soft i writed is the ..aa.
There is another one with..a.
What is the difference between them?With the same boost eprom and with the"aa" software the car runs better than with the stock fuel eprom.
I'll replace the oe boost eprom with an"aa" boost file to see what happens.(there is an"a" and also an"aa" softwares for boost)
I can install a narrowband afr but i don't know if it worth it.It will stay at lean or rich if it's case or it will jump lean-rich?If it's near stoich i know it will jump from lean to rich and viceversa,but if it's far from stoich the gauge will stay on that side?This is strange,because if it is far from stoich in the rich side is not a tragedy,but if the gauge shows lean i'm afraid to experiment anything...

Regards,
Bogdan

[pasbogdan]

i can't uppload .bin.
So: http://webplaza.pt.lu/aklosen/index/...d/download.htm
There are bins a and aa for aan

[prj]

The fuel chip you can change to 551AA.
But the boost chip in 551A and 551AA is different.

In 551A it is 27C64, in 551AA it is 87C257.
Two very different chips.

So leave the boost chip like it is.
Or if you want I can send you a better boost chip
---
Narrowband is useless.
If you are handy with the soldering iron, you can get a controller+sensor here for only 200$

[pasbogdan]

THX!!
What about the difference between "aa" and "a" softwares both fuel and boost?What is different?

[prj]

The software is similar. Newer software just has some improvements compared to older.
That's why I run 551E software in my ECU
I have immo as well though. Without immo you are limited to running 551AA.

[pasbogdan]

i found "c" vesion of softwares.
So...we know there in"a"version,"aa","e"(prj has it) and i found "c".
How many there are?From "aa" version the immo is present?



Regards,
Bogdan

[pasbogdan]

prj already explaned on other topic

551A/551AA/551B = no immo
551C/551D/551E/551F = immo