Finally solved the mystery of the Coil on Plug kit parts supplied by RacerX in the USA.
RacerX didn't supply any fitting instructions but how difficult could it be?
I naively assumed that the kit parts replaced the dizzy with a cam trigger sensor. When I couldn't work it out I emailed Jeff at RacerX and he sent me a link to his thread on the MR2OC forum. You need to be registered to view but sadly this is nowhere near as easy as our DC forum
....however with some help from JP I have found a wealth of info on the site. It appears that the original COP kit cam trigger has been replaced with a blanking plug to replace the entire distributor assembly. The fact they'd included an alloy dizzy cap in the kit led me astray. There is no need for this if you use the blanking plug.
The cam trigger Cherry Hall sensor in the updated kit is now mounted on the alloy bracket bolted to the drivers side engine mount and the slotted disc is mounted on the exhaust cam timing wheel. The only problem is the engine mount on the ST205 is completely different to the MR2 so you can't use the alloy bracket as supplied. The solution we have come up with is to fabricate a new bracket which will bolt on to the alternator bracket. This is rigidly bolted to the engine so won't flex or vibrate under load. The photos below should illustrate the situation.
Kit photos courtesy of RacerX (
www.racerxfabrication.com), others are mine
Cam trigger sensor, mounting plate and distributor plug
1ZZ-FE Coil in Plug
Coil on Plug Mounting Plate. This could be modified so that the orientation of the COP's is aligned. The RacerX kit assumes it has to make allowances for MR2 clearances but on my build we don't have these issues
As installed on Track Toy. The plugs and tails were also supplied in the kit. Plan is to fit a flexible rubber boot which will fit over the top of the standard Denso plugs and make it look more professional
Toyota 90080-19015 1Z-FE Coil on Plugs by Denso - Made in the USA! Good for up to 700bhp output 3S-GTE according to the guys on the MR2OC forum
Track Toy cam timing cover removed. I'm not sure if it will be possible to re-fit the cam timing cover with the sensor installed. I guess a slot could be cut for the bracket/sensor but it would look like a bit of a bodge. I'm sure a neater solution is possible.
RacerX MR2 cam sensor installation
RacerX 12 tooth crank sensor installation. I didn't buy this as I had cloned a crank trigger borrowed from JP. RacerX also sell a 36-1 and a 60-2 wheel for finer adjustment at high rpm. Just thought I'd include for completeness
Track Toy engine bay