samQ you're right about saying there is no telling engine position when triggered from the crank.. but this is why you also run a cam angle sensor in conjunction with the crank trigger. std 4age dizzy has both trigger wheels in the dizzy. all you're doing is moving them to a different spot. if they're both vr sensors then it makes it easy to source sensors for the job. hard part is getting the position of the sensor right and making adjustable mounts so timing can be adjusted if required. in theory you don't need to adjust once its positioned, since the crank position does not move. only possibly the cam position with belt wear. the only adjustment i could find on factory crank sensors was the gap between sensor and trigger wheel.

Many toyota waste spark engines run this setup. have seen it on a 4efe, 7afe, 3sfe etc. i have pullies from these to prove it.

 

and i have a rather simple answer to plugging the dizzy hole off. i was stripping a rwd 3sfe sr40 liteace noah engine the other day which is twin coil waste spark and no distributor at all. dizzy hole is still there but with a FROSTPLUG in it. duh. glad i thought of it :dance:

Edited December 27, 200916 yr by AE25

oh and when i was refering to a crank pulley trigger wheel.. i was meaning the lower cam belt pulley. so not modifying the factory harmonic balancer pulley at all. basically adding teeth to the back face of the cam pulley.

 

this is a pic of the custom 7afe/4age pulley required when using 7afe oil pump and crank trigger. rather than a full billet piece.. it'd probably be easier making a laser cut tooth plate to tack on the back of a std pulley. (if the weld will hold).

I believe there is enough material in a 7afe pulley to have the 4age teeth cut straight into it too.

i'll have a go at a billet pulley for my own engine. once i've proven it, i'll see what it'll cost to make. don't hold your breath.

samQ you're right about saying there is no telling engine position when triggered from the crank.. but this is why you also run a cam angle sensor in conjunction with the crank trigger.

 

ah clever I didn't think of that