The_Pipefather

iTrader: (5)

Yes I did a search, and no, the answer is not clear.

I was wondering if you guys who are running COP with MS1 on an NA, run it in sequential mode, or in wasted-spark mode? I read this and its not clear whether this is possible with the CAS?

http://www.msextra.com/manuals/MS_Ex...l.htm#twotrigs

(scroll down to sequential COP).

Zabac

iTrader: (39)

I think everyone here runs wasted spark with dreams and hopes to be able to figure out how to run sequential.
If you figure it out, make sure you share asap

Matt Cramer

MS1/Extra can only run them in wasted spark mode with the stock CAS; you'd have to make some creative mods to the CAS to get them to fire sequentially. The MS2/Extra 2.0 beta code can fire them sequentially.

The_Pipefather

iTrader: (5)

or, maybe using a crank wheel with the existing 2nd trigger input?

y8s

iTrader: (8)

on the 1.8 magnetic CAS the mods should be easy enough. there's two sets of sensors. And the plates are both independent so you can just goof around with them until the pulses are in the right place. Unless of course the pulses from the two signal out wires are phased properly already.

Matt Cramer

However you set it up, for COP with the MS1/Extra code you'd have to get 1 and only 1 pulse on the 2nd trigger for each cam revolution.

The_Pipefather

iTrader: (5)

I havent seen the inside of a CAS but from the DIY website install article, the inner ring of holes has only one hole. So wouldnt that make it one CMP pulse per 720 deg. crank rotation?

Joe Perez

iTrader: (8)

On both the magnetic and optical NA CAS, the CMP signal is one pulse per crank rev, two per cam rev. The two CMP pulses are not of equal duration however, one is high during both the leading and falling edges of the corresponding CKP pulse, the other goes low before the falling edge of the corresponding CKP pulse. (or maybe it was the leading edges of CKP... I've got the printout at home.)

Either way, what you'd need to do is to modify the CAS wheel to eliminate one of the two CMP pulses. I believe you'd want to end up with the one that occurs just before #1 TDC. On the magnetic version, you could simply cut off one of the two teeth. On the optical version, you'd need to fill in one of the slits.

Here's what the inside of the optical CAS looks like:

y8s

iTrader: (8)

you can either cut off the teeth or build a circuit to "ignore" the second pulse. say with a T flip-flop.

The_Pipefather

iTrader: (5)

Since its an optical sensor on the 90-93 and it doesnt care about proximity, maybe there is enough space to solder or maybe glue a tiny piece of aluminum sheet on the backside of the existing plate?

I need to get a spare CAS and try this myself.

On the MS two additional outputs need to be brought out to the harness.

y8s

iTrader: (8)

you can get thin aluminum tape. home depot.

Matt Cramer

But the flip-flop had better know which pulse to ignore, or your coils will only fire correctly half the time you crank up the car.

Reverant

iTrader: (10)

My only concern with these mods is losing the balancing of the wheel. Either via adding weight (tape on the opto CAS) or losing weight (sawing off a flux shield on the magnetic CAS).

Jim

The_Pipefather

iTrader: (5)

I posted this on the Extra forum today:

http://www.msextra.com/viewtopic.php?t=28252

Maybe I should've asked here first.

I think sawing off the magnetic CAS seems like a more reliable option, PROVIDED 4 pulses are enough on the CKP signal.

If an escort GT distributor is similar to a 94-97 CAS I'm gonna find me one in the yard today.

The_Pipefather

iTrader: (5)

Ok I went to the yard and picked up a CAS. I have some interesting findings for you guys:

1) A Ford Festiva has the exact same optical CAS as the 90-93 miata, except that there is only one inner slot. It looks the same as the pic Joe posted, except that the inner lower slot isn't there. This would give the required 4 + 1 pulse.

2) I picked up a Ford GT distributor which is the exact same magnetic CAS as the 94-97 miata, except that there is only one inner "ear". This would give a 4 + 1 pulse as well.

So all those who're looking for a cheap CAS go to the yard and find yourself a Ford Festiva. Nobody wants parts off of those. Got the CAS for $20.

Sequential COP, here I come!!

mikeflys1

iTrader: (2)

escort gt distributor...

The_Pipefather

iTrader: (5)

There are two types of escort GT distributor, the one above and the magnetic type posted by y8s, except with one inner ear.

The point is, now that the requisite signal is in place, how to get 4 outputs out of the MS. I'll be researching and implementing this in the coming week.

The_Pipefather

iTrader: (5)

This is the distributor I have:





I plan to install it this weekend, run with the stock coils for now, and then upgrade to COP.

y8s

iTrader: (8)

that's pretty awesome. saves you having to mod anything!

Zabac

iTrader: (39)

Pipe, seriously...you think this will work?
I am very ignorant when it comes to electronics, but I do inderstand when someone explains something.
So, are you saying that, if I get an Escort GT CAS (I have a 94 1.8) that it will fit right in place of my CAS and i'll be able to run two extra wires (which you will explain I am sure) from my MS (standalone) to my coils and have sequential ignition?
Will this be possible on 94+ cars?
Will this work on parallel installs? I am asking for others...
Will this work on NBs? Also for others...

Thanks,
Dan