GT40s.com - View Single Post - 1UZFE for Superlite Coupe

JohnC · 10-28-07, 06:56 PM

We've just been to the dyno with this motor and broken it in. It was not uneventful, however, as we spent nearly three days trying to figure out why the timing belt was so loose (causing it to jump time). In the end, we just fixed it by shimming the tensioner, and moved on.

After corresponding with a couple of ignition guru's at the MegaSquirt forum, I wasn't expecting the single EDIS8 module to be able to spark the 8 coils (2 sets of 4 connected in parallel waste spark mode), and sure enough, it didn't. Here's the way I had the EDIS connected initially:

Off came the 8 coils, and on went (2) Ford EDIS coilpacks and 8mm Mustang plug leads. Then the motor fired right up. Dennis Faerman (Faerman Racing Engines, and owner/operator of the dyno) was amazed how smooth the little 4.0 litre motor was. We did a couple of pulls to get the rings seated, then we shutdown and I put the COP's back on and rewired the ignition with (2) EDIS8's, so that they were sharing the VR pickup, and the SAW signal from the controller, but each output was sparking only a single coil. The engine fired right up this way, and we made a couple more pulls.

Here's the twin EDIS8 schematic:

And here's a link to the last pull we did where the motor made 240 lb-ft @ 3100 RPM, and 211 BHP @ 4900. That's Dennis running the dyno, and Dan DaVinci of DaVinci Carburetors riding shotgun. Many, many thanks to both these guys for their invaluable help as I was trying to get this motor running. Dan even let me use one of his 750 double pumper Holley's when my little 390 CFM eBay overhaul wouldn't even start the motor.

We didn't really push it, or try to tune for power because of the weird carb/manifold setup. My intention with this setup was only to break the motor in, not chase power, and we accomplished the breakin very well.

As the manifold is designed to have a supercharger up top, and injectors firing into the intake ports, it just wasn't performing with a carburetor squirting an air/fuel mixture into it. Too, I discovered after the fact that I'd forgotten to connect the signal wires between the ignition controller and the EDIS8's, so we were running the whole time in limp mode with only 10 degrees advance.......dohhh.

Next step is to put the supercharger and fuel injection on and dyno again, and chase some power this time

10-28-07, 06:56 PM	#77 (permalink)
JohnC cribbj Missing a few cylinders Join Date: Apr 2006 Location: Houston or Algeria GT40: Only the motor & G50, so far Posts: 227 Rep Power: 5	Re: 1UZFE for Superlite Coupe - Ideas? We've just been to the dyno with this motor and broken it in. It was not uneventful, however, as we spent nearly three days trying to figure out why the timing belt was so loose (causing it to jump time). In the end, we just fixed it by shimming the tensioner, and moved on. After corresponding with a couple of ignition guru's at the MegaSquirt forum, I wasn't expecting the single EDIS8 module to be able to spark the 8 coils (2 sets of 4 connected in parallel waste spark mode), and sure enough, it didn't. Here's the way I had the EDIS connected initially: Off came the 8 coils, and on went (2) Ford EDIS coilpacks and 8mm Mustang plug leads. Then the motor fired right up. Dennis Faerman (Faerman Racing Engines, and owner/operator of the dyno) was amazed how smooth the little 4.0 litre motor was. We did a couple of pulls to get the rings seated, then we shutdown and I put the COP's back on and rewired the ignition with (2) EDIS8's, so that they were sharing the VR pickup, and the SAW signal from the controller, but each output was sparking only a single coil. The engine fired right up this way, and we made a couple more pulls. Here's the twin EDIS8 schematic: And here's a link to the last pull we did where the motor made 240 lb-ft @ 3100 RPM, and 211 BHP @ 4900. That's Dennis running the dyno, and Dan DaVinci of DaVinci Carburetors riding shotgun. Many, many thanks to both these guys for their invaluable help as I was trying to get this motor running. Dan even let me use one of his 750 double pumper Holley's when my little 390 CFM eBay overhaul wouldn't even start the motor. We didn't really push it, or try to tune for power because of the weird carb/manifold setup. My intention with this setup was only to break the motor in, not chase power, and we accomplished the breakin very well. As the manifold is designed to have a supercharger up top, and injectors firing into the intake ports, it just wasn't performing with a carburetor squirting an air/fuel mixture into it. Too, I discovered after the fact that I'd forgotten to connect the signal wires between the ignition controller and the EDIS8's, so we were running the whole time in limp mode with only 10 degrees advance.......dohhh. Next step is to put the supercharger and fuel injection on and dyno again, and chase some power this time Last edited by cribbj; 10-28-07 at 07:01 PM.