openecu.org

Hi!
Somebody has with the order anyone one stock ROM for ECU MMC MY00-05 on basis MAP-sensor ?
Can put here or in Private mess.
Thank.

I think all the modern factory ECUs are based on MAF.

It is most definitely possible to switch it over to MAP for load determination for a sort of messy speed-density solution, but no one has actively been making such modifications to ROMs. A real MAP based fueling and timing change would take more work.

Working the systems of the engines MMC "civil" performance MY05-06 4G13, 4G18, 4G63
it`s organized on MAP-sensor.
But altering MAF-system in MAP-system impossible.
A/D transformation and processing the signal of MAP-sensor it`s executed
(as a rule) in module of the angular synchronizing the program ECU and MAF-sensor
in module of the time synchronizing.
I more to like working the systems on MAP-sensor (more stable importances on high RPM).
Example fluctuations of evidences MAF-sensor (log-file 1,6L engine "civil" realization,
not turbo), step at time = 0,38 sec. :
RPM - Air Flow (g/sec.)
7160 - 111,1
7200 - 124,7
7280 - 127,8
7360 - 118,4
7400 - 132,4
7480 - 126,6
7560 - 127,1
7640 - 128,3
7680 - 140,3
7720 - 131,5
7760 - 136,9
7840 - 140,3
7880 - 143,5
7920 - 138,7
7960 - 127,8
8040 - 139,7
8120 - 142,7
8160 - 130,1

Amplitude fluctuations of evidences ~25 g/sec.
Amplitude fluctuations of evidences when functioning system on MAP-sensor =0,5-1,5g/sec.
on this engine and on this ECU.
But this subject of the separate talk.
I only got acquainted with MMC-systems.
Thank!

My car (UK FQ340 which is basically a JDM IX GSR with exhaust, hard pipes and leather/sat nav) has 3 bar MAP and inlet manifold temp sensor, although they seem unused.

I was wondering about replacing the load value with the MAP value and remapping to suit.

I have the ROM disassembly and the locations for load and MAP... but I haven't got around to doing it yet. The biggest need for remapping would be at idle where the VE is lower and MAP would make it too rich.

S54fan wrote:My car (UK FQ340 which is basically a JDM IX GSR with exhaust, hard pipes and leather/sat nav) has 3 bar MAP and inlet manifold temp sensor, although they seem unused.

I was wondering about replacing the load value with the MAP value and remapping to suit.

I have the ROM disassembly and the locations for load and MAP... but I haven't got around to doing it yet. The biggest need for remapping would be at idle where the VE is lower and MAP would make it too rich.

Algorithms of the programs modern ECUs Bosch (and others) permit application of both transmitters MAP or MAF.
The switching is carried out in a mask of a complete set.
In given moment in programs ECU MMC of a Evo-series I do not see an opportunity of application of a MAP-sensor.
Only use of the additional MAF->MAP Translator.

With enough effort we can rewrite the code to use MAP as the load source though. I haven't had sufficient motivation to do it for this car, but for my last Subaru to run ported shroud compressor housing on GT30R I made a microcontroller MAF simulator box to run speed density on MAF based ECU. However, the most elegant way is to reprogram the ECU, especially since the required sensors are installed on the JDM/UK Evo IX. Lots of work still though!