There used to be a page on Megasquirt.info tied to one of the beta releases of MSII that explained in detail why 36-1 (or any other number). All I can remember right now is that it had something to do with being a multiple of 4 with a 4 cylinder engine.

Ideally, more teeth = more timing resolution and therefore better timing accuracy but many ECU's aren't powerful enough to count each tooth, only the missing one as a tach reference point. EDIS might be, though, since it's a specialized unit. Not sure.

 

It's for triggering the EDIS module. The EDIS is an external module that handles timing calculations. It is hard-coded for a 36-1 crank wheel.

 

What Matt said. I was having a forest-through-the-trees moment.

 

Where did you source that wheel from?

I will be using msII v3.0 on a 97 turbo 1.8L here shortly and am looking to do a similar crank wheel setup as you.

 

There are a bunch on eBay, and they are all over in the junkyards. I forget the exact engine, but many Escorts, Topaz, ect had them. The EDIS box is on the drivers strut tower next to the fuse box, coils are nearby, and the VR sensor and wheel are on the crank nose.

 

It is a 2 piece desgin that consists of the actual trigger wheel with teeth itself and the hub. the trigger wheel is off a 90's Ford Escort and the hub is a custom made aluminum hub. Im wondering if theres any interest in these and I may have them fabricated overseas....

 

I forgot to ask, but how did you connect the AL hub to the pulley itself?

 

Thats as much a video of me as it is his wife Been around as long as the internet.

Still she's hot though

 

You guys do realize MSIIextra can use the stock Miata CAS sensor?

 

It pressed onto the pulley

I had started the crank pulley trigger wheel project before MSIIextra became compatible with the CAS. I also wanted to set my project apart from other MS-II installs. I think installing a crank trigger wheel will open future doors for my Megasquirt system. It looks pretty too....