Please excuse me for being thick but could you tell me which MyECU uses both the cam and crankshaft sensors?  Are there separate inputs for these?

From what I understand Cliff to say

as long as there is a camshaft input (or pulse) then that can be used to fix the position in the engine cycle.

Other input sensor values eg engine temperature can be used but MyECU can modify them to give appropriate correction

My15 and 16M can drive both spark coils and injectors without additional drivers

Finally if My15M or My16M ecu take only one engine speed and postion sensor input from the camshaft can 2 engine speed sensors (1 from the crank and 1 from the cam) be connected in such a way as to produce a signal that MyECU can properly use?

Sorry for my ignorance guys, if you could answer my questions in order I am very willing to learn 

john in leeds wrote on 08/17/09 at 22:30:25:

Yes, the old P8 works as described in efiman.pdf which you quoted yourself.

Luhbo wrote on 08/18/09 at 08:05:45:

Maybe it's patented but it's not too uncommon. Aprilia has done the same. SAAB Trionic does something similar but more complicated, do you remember that document on ion-sensing during running? It describes the engine starting running wasted spark.

Apparently Sagem tried a system that just takes a guess on which is compression stroke, then tries to save engine from dying if it was the wrong guess. As you would expect it did not work too well

_Cliff_ wrote on 08/18/09 at 11:45:39:

What? When I say P8 I mean a MyP8 of course. I thought that was obvious. That invalidates point 1-3 and point 4 is given as we want to avoid wasted spark. That is also why we ask these questions here. Can we use the crank shaft wheel as is and add a phase sensor? Or do we have to modify the crank shaft wheel?

Hi all!

It's me together with John in Leeds who are attempting to "remove" our stock ECU on the Highland.

Things to take into matter perhaps;

Why I want non wasted spark is that the charging time for the coils will be cut in half. The Highland uses separate COP:s, taken from some standard car. At 10000rpm each coil will ignite 10000times. Without wasted spark it'll be half. More charging time equals more energy to the spark, correct me if I'm wrong please. At compression ratios around 12:1 on some applications, I recon high energy in the spark is a key issue.

In order to determine if the engine is in compression or exhaust phase, a sensor for cam-position must be a must have? Can't see how to detect it otherwise, using only a crank trigger.  (If not doing as Saab, making an ion-read or as the stock Highland ECu using a flywheel acceleration measurement. Think either needs loads of coding/parts..)

Thanks for all your help!

There's nothing other than the casing and connector needed from a WM P8, is it?

I was thinking a mini-P8, maybe in a completely custom casing, and preferably with Centronics type connector or some other easily available type. He will have to modify the harness heavily anyway.

I have no objections to using a My15/16M and then adding means for detecting phase, except I assumed it will mean custom modifications to both hardware and software and that is not quite as good as a "standard" MyP8 for a couple of reasons. MyECU is rare enough as it is 

[quote author=6F40454A4A2C0 link=1250279113/41#41 date=1250633576]

Depending on the engine configuration, it may be possible with all those teeth on the crank to detect when it actually fires and not.

quote]

So how would that work Cliff?

john in leeds wrote on 08/19/09 at 18:39:41:

I expect the ecu would be able to detect an accelerating crank after a real firing.