Programmable Motronic ML4.1 for 75/164

[Classic Alfa]

The story on the corods is correct , if you look at the pistons the small end is located about 3mm lower on the 155 TS version .
This give's you the possibillety to make High compression pistons from 155 2,0 TS 8V pistons for a 75 engine .
simply reduce the top of the piston to get the correct compression ( I know it make's the top thinner and I know it will not last that long and I know that it is not normal to do so ) But is't possible and it has been done before with suc6

Just for my information AFM is a single sensor placed in the inlet air stream wrigth ? all other earlier ones had an LMM ( Air mass messurement ) door type , like on the normal 75 TS ?

As you can probbaly recognise what I am trying to do is in stead off buying a MS unit finding something to remap for use with ITB's in combination with a MAP sensor

Thnxz Alpa

[Gabor K.]

Somewhere in there, there was a Marelli IAW, for the 155 Q4 which was a great machine!

Alfa Romeo 155 Models

Alfa chip tuning :

Chiptuning for Alfa Romeo

[Craig]

G'Day Alexei,

See the pic below for a rough overlay of 75TS (in green) and 155 8V TS heads, not shown is the 155 inlet manifold continues up at an angle to improve airflow while the 75 manifold come in horizontal.



AFM (Air Flow Meter) Vane/Flap type (LMM)

MAF (Mass Air Flow) Hot film or hot wire type



.

[alpa]

Ok, so a little difference. Not sure this makes much flow difference.

I think properly remapping an ML will take much more time than using MS or MSAVR.
There are bugs in the ML code. In the ignition timing (ECU sometimes misses 1 or even 2 reference teeth), in the map access procedure (you can not put any values in maps, there is an overflow because division code is wrong). Certainly a few more.
The code written for AFM (flap volume sensor) is very specific for this sensor.
The MAF (mass flow) code is likely easier to change into MAP, but you'd have to add the MAP/RPM -> MAF translation (or an additional ECU).
The ITB transients are much more fast than plenum based intakes, there are lots of oscillations and even MAP measures must be properly compensated if you want a clean mapping. TP/RPM could be better for pure track applications. Try to find a M3/M5 intake description to see how they did MAP measures and idle control.

Motronics usually have too much maps and you have to understand what's their purpose.
Old Motronics can not run high RPM. The 6300RPM comes from Motronic and not engines, it's the same limit on Alfa and BMW engines. M3/M5 had a special ECU from motorsport and was MAP/RPM (ITB).
That's why I changed the CPU and re-wrote the code. Actually my ML4.1 is close to the M1.7 (155/164). The next step is to put an ARM7 daughter board. Because ARM will exist forever now.

IAW code is much more easier, I disassembled the Maserati biturbo ignition and partially injection ECUs.

[Razzo rosso]

Hi Alexis

<<The code written for AFM (flap volume sensor) is very specific for this sensor.>>

So, is my attempt to convert an AFM to a MAF going to fail?
Should I go to MS?

Regards
Simon

[alpa]

Quote:

Originally Posted by Razzo rosso Hi Alexis <<The code written for AFM (flap volume sensor) is very specific for this sensor.>> So, is my attempt to convert an AFM to a MAF going to fail? Should I go to MS? Regards Simon

[Razzo rosso]

"it works well in steady state, transients are still rough but I'm going to work on that".

Yep, thats me
Thanks Alexis

[alpa]

BTW, I finished and mapped injection code 3 months ago. Phased injection (so there is a phase sensor), 2 big 450cc injectors (this is one of the A-series problems).

I have been using the car during almost 2 months as a daily driver, and then decided to install a very low boost 200-300mbar turbo setup, no intercooler, VNT15. Just to get more torque.
Finished today but did not test on the route.

[Duk]

Nice work alpa

Care to share any more information about what you're doing and how your project is coming along?

I encourage any available links to your work

I'm curious about using a reprogrammed Motronic computer with a low boost turbo set up and would be keen to see more information.
Are you prepared to share what lines of the ECU code do what? Specifically where the injector open times and ingnition timing information is kept in the
bin. file.

I would love to be able to modify the factory computer to work with bigger injectors, bigger air flow meter and revised ignition timing so I can add a turbo (or a Greg Gordon supercharger kit) without going to an aftermarket ECU.

[alpa]

Currently the system runs on a low boost Mini 1000 engine. Looks like the only existent turbo MPI series-A .

Note that it's not a Motronic reprogramming, it's a whole code re-write.
Nothing common with the Bosch code except some procedures. I guess you want to change Bosch parameters, it's another work. Check Chiptuning forum, ECU remapping, OBD, BDM, OBD-II software, chiptuning hardware forum.

I used a diesel VNT15 (from a VW 1.9L 110HP AFN engine) and have lots of pain to control the boost, the turbo is too efficient and spins like hell. Standard pneumatic controls does not work or react too slowly, I'm adapting an RC servo for that.

You can connect bigger injectors on ML4.1, it's a low impedance output.