Motec M8: connectors and info for re-wiring.

[ale.agos]

The detail drawings we have for ignition systems depend on the particular ignition system. Our ECUs can generally run any ignition system. You would really have ot be able to give me some idea about how the original system worked. Was it inductive or CDI.

The M8 was replaced by the M800 about 10 years ago so the latest softeware (version 6.0) is the last development for the M8. The M800 has Windows software and would probably be much easier to work with tham the M8.

Does the engine have a synchronization sensor on the cam or in the distributor?

Yes, engine has two sensors, one for rpm and one for sync... They was both connected to M8 in the original harness.

I have some photos of ignition system but i don't know how to paste here. If you have a mail I can send you directly.

[MarkMc]

Hi,
I doubt the Alternator needs to be connected to the ECU, the M8 does not have an Alternator Control function anyway.

Lambda sensors are always a good idea for a race engine for logging so you can keep an eye on how it is going. While the M8 does have a closed loop Lambda function this is only used after the engine has been properly tuned. You would NEVER try to run an engine like this completely of any closed loop control, you MUST get it tuned properly on a dyno by someone with good experience with these types of engine.

The M8 does not have any knock control function, only the M400, M600 and M800 have this. Realistically as long as you have it tuned properly and always make sure you have good fuel it is probably not essential to have knock control.

The M8 does have internal traction control which will work quite well although the M400/600/800 TC is much better.....remember the M8 was replaced more than 10 years ago.

[ale.agos]

Hi,
I doubt the Alternator needs to be connected to the ECU, the M8 does not have an Alternator Control function anyway.

Lambda sensors are always a good idea for a race engine for logging so you can keep an eye on how it is going. While the M8 does have a closed loop Lambda function this is only used after the engine has been properly tuned. You would NEVER try to run an engine like this completely of any closed loop control, you MUST get it tuned properly on a dyno by someone with good experience with these types of engine.

The M8 does not have any knock control function, only the M400, M600 and M800 have this. Realistically as long as you have it tuned properly and always make sure you have good fuel it is probably not essential to have knock control.

The M8 does have internal traction control which will work quite well although the M400/600/800 TC is much better.....remember the M8 was replaced more than 10 years ago.

Alternator is not connect to the ECU, it work alone with just a connection to the unit that recharge cars's battery.

About lambda sensors use I can say that the engine has been properly tuned with M8 on a dyno so it should be ready to accept lambda sensors.

I've read here that M8 will work just with lambda sensors made from Bosch model LSM 11 so I'm designing the new loom with the goal to connect 2 of them.

About Traction control setup it should be previously done in the ECU due to the fact that the car where the engine and the ecu was fitted before was equipped with 3 wheelspeed sensors. They were connected to pins 4A, 15A and 16A on M8 Ecu, I need to check they power supply connection because I don't remember if there were connected on +12 Vcc of the battery or on + 8 Vcc of the ECU. Maybe someone know how is the maximum voltage that I can dispatch to the above pins as sensor's output?

The only wrong thing that I've found in the oldest harness is that Injectors was not connected to the ECU in firing sequence... The guy how did the dyno test said me that is possible to change the order using the software so maybe the harness order was wrong but the software setup was correct... I don't know because I don't have again the cable to access to the ECU. Anyway I will make the new loom connecting Injectors in the right firing order.

I will tell you what will happen during next days...