Miata engine management system

[tnord]

With the allowance of ECUs in the GCR, I was wondering if something like the Electromotive Tec-GT is legal for an 1.8L Miata in ITA. The GCR says you can only use a crankfire ignition system if the car was fitted with one from the factory. The Electromotive system uses its own crank sensor you install.

Does the 1.8L Miata have a crank sensor? Am I talking about the same things or am I confusing definitions?

My overall question, however: Would something like the Electromotive Tec-GT be legal on the 1.8L Miata?

1.8L miata does not have a factory equipped crank fire ignition system.

[Prof. Chaos]

Thanks. I think I was confusing a couple sections of the GCR...but regardless, if the car doesn't have a crank sensor then I can't add one. Thanks for the help.

[C. Ludwig]

The Electromotive systems only use the 60-2 trigger wheel. Since you can't add the wheel and sensor under the rules the Electromotive systems are out...you already figured that out.

There are a number of other systems that can work with the stock sensors. We're doing plug-in patch harnesses using the Haltech E8/Sport 1000 for the 1.6 and 1.8 cars now.

[Greg Amy]

Since you can't add the wheel and sensor under the rules the Electromotive systems are out...you already figured that out.

But...since the crank angle sensor is probably nothing more than a Hall Effect sensor...and the distributor innards are free...what keeps you from tricking the Electromotive into thinking that the distributor Hall Effect sensor ain't nothun' but a high-falutin' crank angle sensor...?

(Don't mind me, I'm jes brain-stormin'...besides, Tristan's supposed to be ignorin' me and all...)

[Prof. Chaos]

But...since the crank angle sensor is probably nothing more than a Hall Effect sensor...and the distributor innards are free...what keeps you from tricking the Electromotive into thinking that the distributor Hall Effect sensor ain't nothun' but a high-falutin' crank angle sensor...?

(Don't mind me, I'm jes brain-stormin'...besides, Tristan's supposed to be ignorin' me and all...)

This sounds all too smart to me...I'm having trouble just understanding the GCR.

[C. Ludwig]

If you can convince an Electromotive ECU that the 4+2 cam sensor is a 60-2 crank trigger and that the OE Hall sensor (read: square wave output) is a VR sensor (read: sine wave output) you're better than most.

[Greg Amy]

ANYTHING is possible, Chris. I don't know anything about the Electromotive system, buts bits is bits, and programming is programming.

Personally I'd buy a MegaSquirt and be done with it. But if you've got The Big Love for Electromotive, "if there's a will..."

GA





(P.S. - disregard the "edit" in Chris' post above; I accidentally hit the "edit" button instead of the reply button, and didn't notice it until it was too late. Fortunately, I was able to recover his response to me without any changes. Damn you, moderator superpowers!!!)

[shwah]

I thought DIYautotune.com had put together a plug and play package for the Miata already, based on megasquirt.