4age 24/4 dual trigger?

[jabran200]

Can I use MS1 with a dual trigger distributor as found on the bigport 4a-ge which has a 24 toothed wheel with no missing teeth and a second wheel with 4 teeth.

I have seen reference to 24/2 and 24/1 but npot 24/4, I think it could work or I may have to grind a tooth off the first wheel to make 24-1?

[jsmcortina]

Ignore the 24 tooth wheel and use the 4 tooth wheel as a distributor input "MSnS" mode.

James

[jabran200]

I need the 024s9 firmware to open the .msq file jamesl had or if someone could send send one for the latest msns extra? e-mail to jabran200@yahoo.co.uk

also are there any benefits with running 24-1 vs 4 tooth?

[t_cel_t]

well when you run 2 triggers or a missing tooth the ecu is able to determine where each cylinder is at and what cylinder will be fireing. this is needed if you want to run coil on plugs.

[jabran200]

So I have setup the megasquirt to work in MSnS mode and tested with the jim stim, I selected "even fire distributor" using the dip switches, 5v pullup, tach signal normal, square wave.

Everything seems to be working, inejctors, ignitions, all sensors etc and the rpms appear to be stable too.

Is "even fire distributor" the correct setting for jimstim for msns distibutor mode? I think it is but just incase I am wrong which one should I use?

thanks, I know these questions are basic but just want to double check, I want to plug it in tomorrow so going to wire up the ecu plug to the megasquirt db37 and have a try I guess.

[jabran200]

O.k So I plugged in the megasquirt and I am not getting spark as far as I am aware as In the trigger/tooth logger I am not getting anything at all. Fuel pump primes, tps works, water and air temp work, grounds work.

these are the settings I have:(pretty much the same as james l's article)

Ign input:

tachselect --> opto in
TSel --> opto out
xg1 --> xg2
12v pullup - 1k resistor from non banded side of d1--> banded end of d9

Ign iutput settings:
d14 to ign = output ign to pin 36
5v pullup to the wire going to pin 36 --> 1k resistor from 5v to IGN

NE is going to pin 24 on db37
IGT from pin36 on db37

Any help at all? please

[jsmcortina]

You have a VR sensor distributor but you have set the mainboard for hall sensor - that won't work. You need to set the mainboard up for a VR sensor, step 26 in the MS1 build manual.

James

[jabran200]

Ah, I thought it was a hall sensor. I shall try it now.

[jabran200]

O.k So i followed the steps BUT it didn't mention the 12v pullup from d2 to d9 and the 5v from proto area to ign? looking at the scematics the 12v kumper this is only required for the hall circuit? but the 5v pullup on the output is still required?

I did try it on the stim and could not get a signal, I then read the stim can't display a vr signal properly? I tried it in the car and the trigger logger did not pickp anything again?

I believe I am using an esa setup, I have checked that I have NE (4 toothed wheel) going to the megasquirt pin 24 etc.

Is there anything else I can check?

BTW Following the instructions in step 26 I jumper tsel to vroutinv and tachselect to vrin.

[jabran200]

ok the car sparks now but just at the wrong time.

I am reading 1400rpm on cranking.

I get a spark at the king lead when I turn the ign on and then goes away when pump is primed.

Also when I crank it behaves like it is seizing, wrong spark.

I have a feeling spark out is inverted due to vroutinv jumpered to tsel ?

[jabran200]

vrout to tsel and it cranks, runs if I hold throttle but very rough as the map is not set proper.

EXCITED lol

[jabran200]

O.k I have hooked it up etc and tried to get it started but as soon as I get it running in megasquirt it shows the car revving at 4000-6000 rpm with revs fluctauting and the car revving up and down but surely the engine can't reach those sort of revs with throttle closed?

I am going to get a timing light on it and see what it shows.

Any ideas guys? I think it truly is revving at 1500 or so rpm and dies at anything below 4000 rpm which it does after a 20-30 seconds but will last longer.

[Matt Cramer]

Any chance it's accidentally wired to the 24 tooth wheel?

[jabran200]

I guess nothing is impossible, although I did check a spare dizzy to make sure I had the right pin. I will double check and see.

I would have thought it would not have started with the 24 tooth wheel though?

Also I only have a 5v pullup on the ign pin using a 330 ohm resistor, NO 12v pull up from d2 ->d9. I removed it and found it made no difference.

[jabran200]

So I had a check and indeed it is wired to the wrong wheel although this is a mistake in the diagrams and pinouts I found online.

The 4 tooth wheel is th g signal and the 24tooth is ne, the diagrams show it as opposite. Anyway I will switch them around an dhave a go.

[jasaircraft]

So I had a check and indeed it is wired to the wrong wheel although this is a mistake in the diagrams and pinouts I found online.

The 4 tooth wheel is th g signal and the 24tooth is ne, the diagrams show it as opposite. Anyway I will switch them around an dhave a go.

So how did it go?