M84- 4 CYLINDER, 4-STROKE, SETUP SEMI SEQUENTIAL

Discussion and support for MoTeC's previous generation of entry level ECUs

M84- 4 CYLINDER, 4-STROKE, SETUP SEMI SEQUENTIAL

Postby dr350 on Tue Jun 29, 2021 12:17 am

Hi

I use M84 on a 4-cyl 4-stroke engine, which has no camshaft signal.

SETUP:
Number of Cylinder: 24
crankshaft signal: 60-2
REF / SYNC Mode: 8 (2 Missing teeth once per cycle)
Firing order: 1-3-4-2
Number of coil: 2

Wiring Ignition:

IGNITION 1: (CYL: 1 AND 4)
IGNITION 2: (CYL: 2 AND 3)

WIRING FUEL INJECTOR:
INJECTOR 1: CYL 1
INJECTOR 2: CYL 3
INJECTOR 3: CYL 4
INJECTOR 4: CYL:2

I was reading in this post: viewtopic.php?f=47&t=2689

I understand that in this mode (8) works in group fire (SEMI-SEQUENTIAL)

The injectors fire 2 times every 360º.


Question:

In what order do the injectors fire: Group 1: CYLINDER 1 and 4 or 1 and 3?
Group 2: CYLINDER 2 and 3 or 2 and 4

The injector duty cycle correspond every 180º?

Thanks, regards!
dr350
 
Posts: 25
Joined: Sat Nov 23, 2013 4:35 am

Re: M84- 4 CYLINDER, 4-STROKE, SETUP SEMI SEQUENTIAL

Postby dr350 on Wed Jun 30, 2021 9:28 pm

Hi,

Excuse me for inciting, surely it is a very basic question, but I wanted to evacuate this doubt.

Thanks, Regards!
dr350
 
Posts: 25
Joined: Sat Nov 23, 2013 4:35 am

Re: M84- 4 CYLINDER, 4-STROKE, SETUP SEMI SEQUENTIAL

Postby SDean on Thu Jul 01, 2021 9:26 am

Hi,

In this mode it will fire the uneven Injector outputs in the first batch, and then the even injector outputs in the second batch 360 degrees later. This means that the injectors have to be wired in the correct firing order to the ECU so that the injectors are fired at their correct timings.
Stephen Dean
MoTeC Research Centre Melbourne, Australia
User avatar
SDean
Site Admin
 
Posts: 1162
Joined: Tue Dec 02, 2014 9:29 am
Location: Melbourne

Re: M84- 4 CYLINDER, 4-STROKE, SETUP SEMI SEQUENTIAL

Postby dr350 on Thu Jul 01, 2021 10:16 pm

Hi,

Thanks for Your reply.

Is mode 8 correct / optimal for a 4 cyl, 4 stroke engine without a sync sensor on the camshaft?

The injector duty cycle, how many degrees is it?

Thanks, Regards!


SDean wrote:Hi,

In this mode it will fire the uneven Injector outputs in the first batch, and then the even injector outputs in the second batch 360 degrees later. This means that the injectors have to be wired in the correct firing order to the ECU so that the injectors are fired at their correct timings.
dr350
 
Posts: 25
Joined: Sat Nov 23, 2013 4:35 am


Return to M84 ECUs

Who is online

Users browsing this forum: No registered users and 3 guests

cron