TheDarkSideofWill wrote:
The 60 degree V6's retained the distributor port in the block and used a plug to drive the oil pump. How does the 4.0 deal with not having a distributor? Plug in the hole? Hole not there?
TheDarkSideofWill wrote:. The same ECM was used to control distributor and DIS engines. The only difference was the chip.
Not on the Jeep JTEC PCMs. They are more closed than the GM ECUs a well. On the Dis less system there are there separate leads from the PCM for each coil. I could possibly see them combined in to one to fire a single coil, but I don't see it working the pther away around. I.e. using an older PCM to run the coil rail.
TheDarkSideofWill wrote:. The same ECM was used to control distributor and DIS engines. The only difference was the chip.
Not on the Jeep JTEC PCMs. They are more closed than the GM ECUs a well. On the Dis less system there are there separate leads from the PCM for each coil. I could possibly see them combined in to one to fire a single coil, but I don't see it working the pther away around. I.e. using an older PCM to run the coil rail.
I guess that's basically what I wanted to know... are there enough smarts on the coil pack that it can do its own spark distribution or are the coils fired directly from the PCM... That makes it a lot harder to adapt. Thanks!
I'm a little unclear what your goal is here, and what vintage GM EFI you are looking at. You can get a HEI distributor with the proper reluctor and electronics for about $350.00 Or just but yone of the $100 ones they sell on Ebay and lock the Vacuum and cent. advance and change the module. If you want to go distributorless then you willhave to mount a trigger wheel and sensor on your harmonic ballancer. The jeep coil pcak should not be used, just keep it all GM.
You can make your own wiring harness, several sites on the internet sell the pigtails to go to the injectors ond sensors. Turbo tom used Megisquirt with a modified distributor on his 450 hp 4.0L
Peter Lechtanski
The worlds Fastest Comanche Prroject
If I were to use a trigger wheel setup, I'd drill the appropriate holes in the flywheel and mount a GM sensor in the sheet metal dust cover for the bellhousing and clutch. I don't think that would be too hard.
The GM DIS is higher performance than a single coil distributor. The stock GM DIS hardware is easily good to 15 psi of boost, for instance. I was just wondering if the Jeep coil pack was worth using. I knew nothing about it, so I needed more info. Since the Jeep doesn't have the smarts to do its own distribution, I can't use it with the GM ECM, which has a single ignition output to operate either distributor or DIS.
I'll be using the GM 7730 computer used on TPI Camarobirds, TPI Corvettes and DIS V6's in the early '90's.
If you really want to use a dis less system and want to swap out the stock PCM for a later one I believe a Ford multi coil pack would work. Accel does make upgrades for those. It was mentioned in an article on having to do with setting the cam sensor. If you search on here for toothpick I you should be able to find the article I am talking about.
I'm just deciding if I want to... That includes weighing benefit vs. difficulty vs. cool factor vs. pragmatism.
But in order to do that, I just need to know about it.
