So I'm trying to drop my Lexus to running solid mid 12's and to do that, I need to change the fuel and ignition system. It's Toyota OBD1 so no chips/programmers, and aftermarket ECU's are pricey. I'm running the twin turbo Japanese Toyota Aristo ECU (PCM in Ford talk) which doesn't use a distributor like my SC300 ECU. Anyway, I need to run 6 coils - or 3 with waste spark, but I didn't have anything laying around except the leftover coils from my V10 swap.





It got the car running, but I think the coils are too weak to handle more than 5 PSI of boost because the car falls on its face after the turbo spools. I have some proper coils on the way now, but I thought some may enjoy the GhettoSpark system.

Oh yeah, the 5.4 also donated a heated o2 to the Lexus project.

 

Are you sure it's the coils and not the plugs????gap and temperature range

 

Well... Those same plugs and wires worked great at higher boost levels than I can hit right now with my old distributor setup, so I don't think so. I think running them with wires too much resistance for the COP design. I should know more tomorrow. My new coils arrived this afternoon.

 

Thats right.....it could be the wires.....cops usually just are right on top of the plugs....

 

I bet your right. Huh, - seen quite a few flaky "yellow label" Motorcraft coils in the past. Might be just coincidence related tho. Yellow's are pretty dated now (old!) I believe the last time I've seen them was on a factory 04 engine. Green's are VERY old. Blacks/paint marked are the newest.

Anyway. The wires may definitely be affecting. Like you said, you may need different coils. The 508's are more less a resistance #. I believe that's a threshold number only, as resistance can vary through each individual coil bench testing and still be considered healthy. BUT,- with the added wire, I'm not sure how that would play out. You may need to make adjustments, just like your thinking. Either a coil with lower resistance number or a higher output to counter.

Design = low volt signal to pulse right... It's all about pulse

 

Didn't get a chance to install the new coils today. I bought a 67 Jeepster Commando for a flip car. Sure do love the way that V10 tows! I towed the Jeep on a 20' tandem axle flatbed behind the Ford for 100 miles or so. It never struggled up the hills - even managed to pass a few people on the inclines.

 

What year did you put the V10 in?

 

This year
It's in my 99 f150, formerly 5.4.

 

Do you have a write up on that swap by chance. Sounds quite interesting.

 

https://www.f150online.com/forums/19...9-f-150-a.html

 

Thanks!

 

Turns out the Ford coils work fine with plug wires attached to them. I had other issues.