Engine management on PJ0/Vac advance?
 

I've been through PGMFI.org forums and the wiki, but there's not really any help there.

There's no way to read the stock ECU in real time, and even if I could find a way to figure out what all the code on the rom means, there's no way to change things except trial and error due to lack of real time monitoring. I could convert to OBD1 and run Crome/Turboedit on a PM6, but that entails hacking up a 90-93 Accord distributor to get it to mount to the A20 head. Either that or megasquirt, and I don't feel like having that much downtime wiring it all into the car.

Do I have any other choices, other than FMU and hope the dizzy advance doesn't make my engine ping itself to death?

Re: Engine management on PJ0/Vac advance?
 

boost will un-advance what the vacuum advanced in the distributor. it's kinda like a plus, if you can get the dizzy to retard extra for boost over what the advance total amount is, you just need to keep the ecu thinking it's got no boost

Re: Engine management on PJ0/Vac advance?
 

Oh man, I didn't even think of that. Well, let's say I figure out how to get around the timing problem completely, is there any way to control fuel well (other than FMU) that would be reliable?

Re: Engine management on PJ0/Vac advance?
 

make a fmu.

Re: Engine management on PJ0/Vac advance?
 

Hmm.. Not the response I was hoping for.

Re: Engine management on PJ0/Vac advance?
 

larger injectors, or megasquirt?

Re: Engine management on PJ0/Vac advance?
 

Anyone else care to chip in?

Re: Engine management on PJ0/Vac advance?
 

sour cream and chives, dill, or bbq chips?

Re: Engine management on PJ0/Vac advance?
 

Just go OBD 1 its not that hard. I did it all in my garage with no special tools. The A20 runs well enough NA off of the P75 map to not have to worry about having the exact tune from the pjo ecu. The Obd 1 swap also cleans up the engine bay.

Re: Engine management on PJ0/Vac advance?
 

How did you end up modifying the F22 distrubutor to bolt up to the A20 head? And do you happen to have a pinout of what pins exactly need to be switched from a OBD0-OBD1 jumper harness to get things to work right? If it truly is easy enough I might as well.

Re: Engine management on PJ0/Vac advance?
 

I cut off the top of a spare(trashed) distributor and made an adapter plate between the stock base and the F22 distributor. I used the stock distributor shaft and cut it to the proper length and welded two washers on top and cut the offset notch in it to go between the cam and the f22 distributor. I ghetto balanced it by sticking it in a drill and using a file to knock down all the high spots until it hit evenly all the way around. I also used the bearing out of the old distributor to brace the shaft in the middle since it was easy enough to do. I had to cut off one leg on the F22 distributor to clear the thermostat housing. I lined every thing up using the tdc marks on the bottoms of the distributors, and tested it on a spare head had in the garage. I also had to get an 90deg bend and a coupler to add to the upper radiator hose to clear the distributor.

Here are some pics from when i was making it. The steel plate started out as a 7" x 7" piece of 1/4" thick and was trimed pretty much how the sharpie line is.
http://i110.photobucket.com/albums/n..._100_2080c.jpg
http://i110.photobucket.com/albums/n..._100_2077c.jpg
http://i110.photobucket.com/albums/n..._100_2074c.jpg
http://i110.photobucket.com/albums/n..._100_2072c.jpg


You can also do it the way guaynabo89 did and cut the legs off and mark the positions you need them rewelded on the distributor body and take it to some one to weld them back on where you need them, I think it took him two tries to get it centered exactly where he needed it.
http://www.imagestation.com/picture/...7/f515bd4e.jpg

from here http://www.3geez.com/forum/showpost....&postcount=281

As for the wiring you just have to get some shielded wire(I picked some up from home depot that was meant for home alarms) and run two wires to the new distributor, and another four(if you don't use the stock o2 wire) to the o2 sensor. I have a ------ sheet some where that has the whole pin out for the 86-87 to a p75 ecu, from when i repined a obd0 to obd1 harness. I can email it to you if you want it.