Is there any reason, why i can't use the std S2 dizzy as a crank position sensor? Ie, use it to trigger an ecu, which then fires a coilpack?

 

No reason but u would need a trigger on it like the cam/crank so whats the point.

 

Suppose it depends on the signal the ecu requires ?? The rst dizzy may have too many or not enough pulses for each revolution of the cam shaft ???

 

The dizzy is connected to the cam, not the crank. Therefore rotating at 0.5 times that of the crank.

It's the phase sensor that goes on the camshaft, for use with sequential injection.

Steve

 

I've seen it done a couple of times. Just looks a bit odd, but works ok. You will need another trigger naturally too or modify the distributor as the ecu has to know which two plugs has to be fired at a specific time.

 

some new hondas dont run a crank sensor,, i think they have two sensors in the phase unit,, one for crank position (so if you was doing this on a cossie ecu'ed rst you would need 8 pickups) and one for phase (again on a cossies ecu'ed rst you would need 2 pickups 90degrees appart)

 

Although I'm sure some people will disagree, I don't advise using the camshaft as an accurate point to base ignition timing on.

It is fine to be used as an RPM pick up (which is how the std ERST works) but the only accurate way to control an ECU for igntion timing is from the crankshaft.

This is because the cam timing relative to the crankshaft will drift at high rpm due to belt lift. This invariably means that an ignition system that bases its reference position on the camshaft will drift from the setting at idle with rpm.

 

Cheers people, logic told me it was possible, just not seen it done. It's for an intemeidate step, just to try something