how do I do ms2 wasted spark

metcap · Post by **metcap** » Fri Mar 30, 2007 7:01 am

Hi, I've had ms2 on v3board for 2 years now and done 2 setups but using the basic vr sensor and dizzy fire. I'm currently planning on a 3sge project which forces me to go with wasted spark. I'm currently researching how I can do this without resorting to getting a ms1 chip. There dun seem to be a well documented write up as the msns so I'm pretty confused as to how to do the ignition setup and the wiring. Please help to point me in the right direction. Do I copy pinouts and wiring mods from msns and run with the ms2 latest beta codes.

Matt Cramer · Post by **Matt Cramer** » Fri Mar 30, 2007 9:12 am

Here's the pinouts for MS2/Extra:

http://www.msextra.com/ms2extra/ms2portpins.html

Post by **jsmcortina** » Fri Mar 30, 2007 1:34 pm

metcap wrote:. Do I copy pinouts and wiring mods from msns and run with the ms2 latest beta codes.

For spark outputs A and B yes. They are taken from the connections leading to D14 and D16 just like in MS1/Extra.

We realise that the documentation is pretty weak at the present time.

James

rb26dett · Post by **rb26dett** » Fri Mar 30, 2007 3:53 pm

probably worth pointing out that there are b&g beta codes with wasted spark, and that he didnt specify extra, and that quite a few have ended up confused about which forum they are on (even me)

i cant help with the wiring though, i dont know about either, but i do know that the wiring for b&g wasted should match the microsquirt internal wiring, which may be easy or difficult. you could probably figure it out from that if thats what you meant.

fred.

Modly · Post by **Modly** » Fri Mar 30, 2007 5:32 pm

I'm curious if I can run wasted spark through the MS2 with a reluctor wheel other than 36-1. I'm having a hard time finding a wheel that will fit (I've got a large pulley) in 36-1, and can find them in 60-2.

Will the MS2 use any wheel?

Post by **muythaibxr** » Fri Mar 30, 2007 8:07 pm

MS2/extra's betas should be able to handle any evenly-spaced missing tooth wheel as it's a -1 or -2 wheel.

The upcoming alpha for ms2/extra 2.x will be able to handle just about any kind of wheel if we're given reasonable documentation for it.

Ken

Modly · Post by **Modly** » Fri Mar 30, 2007 9:56 pm

Good to know. I just heard about the MSII-Extra firmware a couple days ago and haven't had a whole lot of time to get more info about it just yet, but I'm liking it.

I suppose I can wait for a few more (possibly more stable) releases because I don't intend to impliment spark just yet, I just want to make one problem at a time for myself.

On the other hand, is there any advantage to the developers for me to run the extra firmware ASAP, and is there any way to log bugs?

Oh, and the other important question.

What software shall I use to connect to the MS box after updating the firmware?

Gokart · Post by **Gokart** » Fri Mar 30, 2007 9:56 pm

I hope that MS2 will be able to handle that Nissan CAS with 360 outer slots + 4 or 6 inner slots for SR20 and RB26 engines.

Post by **jsmcortina** » Sat Mar 31, 2007 3:37 am

You have a good understanding of how to install and configure a Megasquirt before considering test code.

The beta code is moving along nicely to a stable position, but at present the documentation is sketchy. For some users this will present no problem, but others may find it a very uphill struggle.

Anyone is welcome to try the beta (or alpha) codes and we welcome the feedback, but if you start to find it an impossible task then you would be advised to switch back to base MS2 or MS1.

James

metcap · Post by **metcap** » Sat Mar 31, 2007 7:06 am

l intend to make use of the stock 3sge dizzy as a cam sensor. It's got a 24 teeth wheel and I plan to grind off 2 to make a 12-1 cam angle sensor. What settings should I be using for this setup? I've read an archive article on Club 4ag forum started by muythaibxr, wish there was a sticky here on that. Here's some important info I got from there,

actually the missing teeth are both at 100 deg btdc for cyl1/4

You set up the MS as a 12-1 wheel, with a 70 degree trigger angle, and wheel decoder settings of:

Trig A: 1
Ret A: 3
Trig B: 7
Ret B: 9

So tooth 1 is at 70 deg BTDC for cyl1/4 (either compression or exhaust)
and tooth 7 is at 70 deg BTDC for cyl2/3 (either compression or exhaust).

You set up the megasquirt with 2 spark outputs (the two outside LED's).

If you wanted to do COP instead of wasted spark, you'd cut only 1 tooth from the wheel, and set it up as a 24 - 1 wheel with 4 spark outputs, a 70 degree trigger angle, and the following configuration for the wheel decoder:

Trig A: 1
Ret A: 3
Trig B: 7
Ret B: 9
Trig C: 13
Ret C: 15
Trig D: 19
Ret D: 21

And you'd have to make sure that the only tooth you cut is at 100 deg BTDC for cylinder 1.

Could I just copy over the settings here?

Post by **muythaibxr** » Sat Mar 31, 2007 7:52 am

those settings are for ms1/extra.

Perhaps you should get the ini for ms2/extra, and have a look around at the various settings before asking your questions. The configuration for the wheel decoder in ms2/extra is much different from ms1.

Ken

metcap · Post by **metcap** » Sun Apr 01, 2007 4:21 am

thanks for your advice, yea I know I'm stabbing in the dark but I'm just trying to plan ahead of this project and get some basic data before I start jumping in. Ok so obviously the settings won't be a direct copy, but would the steps for setting up the hardware side ie. the 24 teeth wheel be the same as the previous post?

Post by **jsmcortina** » Sun Apr 01, 2007 9:44 am

For VR signal in and spark A,B (and C if used) out the wiring will be identical between MS1/Extra and MS2/Extra.

For other installs, spark D and 2nd trigger input have moved unavoidably.

James

metcap · Post by **metcap** » Mon Apr 02, 2007 6:59 am

since I'll be running wasted spark how do I sort out tacho output on ms2extra, is there a pinout similar to as discussed on msns?

Post by **muythaibxr** » Mon Apr 02, 2007 8:17 am

Gokart wrote:I hope that MS2 will be able to handle that Nissan CAS with 360 outer slots + 4 or 6 inner slots for SR20 and RB26 engines.

I just noticed this comment.

Most likely, we will support the 4 or 6 inner slots no problem. I doubt that we'll be able to handle 360 slots though, the interrupt load will probably be too much for the processor.

Ken

rb26dett · Post by **rb26dett** » Mon Apr 02, 2007 12:06 pm

it doesnt take much free play etc in the drive to the CAS to make the ECU think drastic accel/decel/rpm changes are occuring. on a stock ECU this will wreak havoc with your idle. I'm off to the UK in a couple of months (dont wanna go) and while i'm there, i intend to collect as many escort 36-1 pulleys as i can and load up the suitcase for the return trip

i have the dsm miata CAS too, but have gone to the trouble of mounting up the 36-1 for accuracies sake.

fred.

Post by **jsmcortina** » Mon Apr 02, 2007 1:58 pm

Not sure you'll find any Escort pullies over here, only US spec Escorts have an external pulley - the UK ones use teeth cut into the back of the flywheel. For an external one you need a Sierra 1.8, but they've pretty much all gone from the scrappies now. The pressed steel one is available new from dealers though.

James

rb26dett · Post by **rb26dett** » Mon Apr 02, 2007 2:04 pm

thanks for the heads up

the one i have came from a scrappy there, about a year ago. i thought escort, but could be mistaken, could have been mondeo too. or something else.

it appears to be ferrit or something, and has what looks like a solder coating...

heres a pic :

http://i50.photobucket.com/albums/f323/ ... 0_3846.jpg

thought it was clearer, but that shows it ok (pulley is machined down to just a spigot on my pulley)

fred.

Post by **jsmcortina** » Mon Apr 02, 2007 2:09 pm

See the pix here:

http://www.msextra.com/manuals/MS_Extra ... l.htm#edis

Or steel one (not in that manual) http://megasquirt.sourceforge.net/extra ... 523986.jpg
although I welded a plate in the middle.

James

rb26dett · Post by **rb26dett** » Mon Apr 02, 2007 2:18 pm

ok, yes, sierra then

i'll admit my crazy step father in law drove all over the country (literally half of it) to get that pulley

but i'm that dedicated too!

i'll have to track you down and feed you warm beer when i get there.

cheers,

fred.

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how do I do ms2 wasted spark

how do I do ms2 wasted spark

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