Project, 4g Distributor / Ecu ( Obd-1 )

[bobafett]

muahahah .... NO

we are pre-obd / obd-0

if we convert to obd-1 or obd-2 (not sure why we would bother to go to obd2) we could run socketed obd1 ecu's which have tunable electronic spark control. ;-) which means we arent limited by vacuum advancing distributors. this is especially useful for guys who are booosting, because they need a lot more control over their fuel and spark maps. and theres several free programs out there with great tuning capabilities and great support.

[SteveDX89]

um... our cars are obd-1.

Hahahaha.

[hot-87-hatch]

I know a lot of theory. But I don't yet fully understand electronics for this car. From what I understand, from the posts below is I can get a p75 cpu and should be able to fit it to the harness for the a20a with a slightly modified adapter harness.

I am replacing with a newer jdm a20. I will be using a b18 mani, tb, injectors and fuel rail. (hopefully) I would also like to eliminate the black mystery box as many vacuum lines as possible.

Would this affect how the p75 operates?

Would it be easier or even possible to run the motor with the whole teg harness, provided I switch out the sensors to match?

Will switching the injectors cause a problem?

How easy is it to tune and change fuel maps with this ecu?

I'm also switching to a manual transmission. And a turbo is being planned for much later on. Sorry if I sound naive on the subject but I am. What I want for now is a reliable n/a car with a moderate increase in power. But this desired result is second in priority. I really want to get into tuning and working fuel maps and all that shit. Which is why this whole thing with the obd1 conversion is so alluring. Thanks for your help.

One more question, Exactly what kind of modification is needed to fit f22 "dizzy".

[Justin86]

he he he he rice shops and fab shops.......... NIGHT AND DAY difference, and regular mechanics hate to see modded cars(engine wise)

[Ichiban]

heeheehee!

I can't wait to take my 2.0 fuel injected 82 hatch to the local honda dealer for a tuneup.

btw my distributer on my a20 is smashed, anyone got one for cheap?

[bobafett]

when i finish my swap ill sell u mine... but who knows when that will be!

[guaynabo89]

I know a lot of theory. But I don't yet fully understand electronics for this car. From what I understand, from the posts below is I can get a p75 cpu and should be able to fit it to the harness for the a20a with a slightly modified adapter harness.

I am replacing with a newer jdm a20. I will be using a b18 mani, tb, injectors and fuel rail. (hopefully) I would also like to eliminate the black mystery box as many vacuum lines as possible.

Would this affect how the p75 operates?

Would it be easier or even possible to run the motor with the whole teg harness, provided I switch out the sensors to match?

Will switching the injectors cause a problem?

How easy is it to tune and change fuel maps with this ecu?

I'm also switching to a manual transmission. And a turbo is being planned for much later on. Sorry if I sound naive on the subject but I am. What I want for now is a reliable n/a car with a moderate increase in power. But this desired result is second in priority. I really want to get into tuning and working fuel maps and all that shit. Which is why this whole thing with the obd1 conversion is so alluring. Thanks for your help.

One more question, Exactly what kind of modification is needed to fit f22 "dizzy".

The black box and vacuum line removal depend on whet ecu you run. some ecus still use constant vacum chambers and such, like the 4th gen cords.


the injectors have to have the correct resistor. you can use the stock efi injectors. they flow the same as the b16-18. (240)

If you can look at wiring diagrams for both cars you plan on using parts from(in ur case 87 accord and 94-95ls teg) then you should have no problem with wiring. If they look like a jumbled mess , study up until you feel comfortable.

[hot-87-hatch]

I've been in contact with chris harris at xenocron and to run an obd1 ecu he says I must change from dpfi to mpfi. I know what these acronyms but what is involved in the switch? thanks for your reply.

The black box and vacuum line removal depend on whet ecu you run. some ecus still use constant vacum chambers and such, like the 4th gen cords.


the injectors have to have the correct resistor. you can use the stock efi injectors. they flow the same as the b16-18. (240)

If you can look at wiring diagrams for both cars you plan on using parts from(in ur case 87 accord and 94-95ls teg) then you should have no problem with wiring. If they look like a jumbled mess , study up until you feel comfortable.

[guaynabo89]

I've been in contact with chris harris at xenocron and to run an obd1 ecu he says I must change from dpfi to mpfi. I know what these acronyms but what is involved in the switch? thanks for your reply.

ur car is already mpfi

[hot-87-hatch]

sweet!!!! that's good news. Anybody know what the difference is?

[guaynabo89]

sweet!!!! that's good news. Anybody know what the difference is?

dpfi is setup like a carb basicly with only one injector usually

[gfrg88]

[QUOTE][a little FYI - i've been talking to these guys http://www.jkobd.com/ who are currently working on an OBD1 conversion harness for the 3g's. I'll let you know if/when i hear they have the kit made and ready to ship/QUOTE]

any updates one the harness or anything else....

[Justin86]

ok here's the scoop on coversion harness............

yea I'm going to be working with Jason K to make a harness for us 3G's and possiblly for 2g lude, will see how it goes.

[Accordtheory]

I have that, from rywire and jkobd's little tag team effort..
The rest of it is still in progress though..

[bobafett]

now are you going to make sure they make one that will fit an 86 AND and 88+ or will they just have to make 2 different parts?

[Accordtheory]

Jason supposedly has the 89 pinout, but it doesn't have the pin to the solenoid valve for the 2 stage intake manifold, a key difference between 86/87 and 88/89. I went over the entire pinout on the phone with ryan from rywire, and all the other pins match with my 87 though. I suspect he actually has the 86-87 pinout.

Me and legend master are the only people I know of that have this setup, and neither one of us has tested it out. My engine harness isn't finished yet either. I'm going to have to send it back, I guess..

[Kabuki]

I thought I might pipe up here and state that I am experienced with ECU chipping and programming. I'm also a Moderator over at PGMFI.org and the AccordWagonClub.com. I also figured that I would extend my offer of chipping services for OBD1 (and some OBD0) ECUs for $50 (including return shipping), that I had made to the AWC folks.

[bobafett]

just FYI ur being a prick about this.. but im feeling 'very' nice today!

AFAIK there is no ecu that will be easier to wire in than the other... its just a matter of converting your wiring to obd1. for distrubutor, yes you will have to swap to an obd1 distributor, it has been decided that 4g external coil dizzy is probably the best bet. i a brand new one for sale, 100 shipped if u are interested.

but there is no 'best ecu for 200whp' u will have to retune the ecu to run boost. dont count on just wiring it up and driving off.

obd1 swap:
OBD1 Distributor
OBD0 > OBD1 Wiring harness
OBD1 Socketable ECU
4 wire o2 sensor
also might be easy if u have obd1 intake manifold with appropriate sensors, map tps etc
also there is a VSS issue to work out, i think carotman or moonscryer figured out a solution.

also u will need appropriate tools to TUNE your socketed chipped ECU. i will let you figure that one out on your own.

ps, there is SOOO MUCH about this topic already on the forum, i shouldnt have even posted this. seriously, you need to search a little bit for this info, it has already been discussed in depth.

[newaccorddriver]

im close enough to being able to convert to OBD1 soon. i just picked up a D series distributor for cheap. the only problem is it didnt come with the igniter or the coil. if i were to get those 2 items, how would i wire them into my car, or would i just splice the connectors from the old coil and ignitier?

[thegreatdane]

The D series distributors I've seen all had internal coil and igniter.
You'll still have to wire the igniter to the ecu along with the extra sensor in the distributor.

What D engine is that distributor from?

[newaccorddriver]

i believe its from a 92-95 civic(guy told me it was an OBD1 distributor).

i was only wondering if i got them cause i think the hondaautomotivepart picture showed me an external coil/igniter

EDIT: what extra sensor is in there anyways?

[Swap_File]

From this ( https://www.3geez.com/showpost.php?p=434014&postcount=8 ) information, I knew that I needed either a TD-31U (internal coil) or TD-52U (external coil) distributor for my OBD-1 swap.

When I looked online for a TD-52U, TD-59U was listed as an alternate part number many places, or places listed them together, or used the names interchangeably.

I recently got a used TD-59U distributor, but could not get it to fit. It seems to always hit the thermostat housing. Am I doing something wrong, or is the TD-59U just not a direct replacement for the TD-52U?

[bobafett]

hahah thats the point. they dont fit without serious modding. i have determined that i would have to cut off all the legs from the 4g accord dizzy, and build new mounting points. i am considering just doing a megasquirt ecu setup.

[A20A1]

Awe, did you hurt your hand swap?

I thought someone said they cut and welded the arms/legs...

[newaccorddriver]

hahah thats the point. they dont fit without serious modding. i have determined that i would have to cut off all the legs from the 4g accord dizzy, and build new mounting points. i am considering just doing a megasquirt ecu setup.

if i can get ahold of a spare head, im gonna try and modify my D series distributor by grinding down some of the metal but keeping the legs in tact so i can still bolt them on. i can picture it in my head, but i need another 3g distributor to compare them. once i modified it enough to bolt it on properly, then ill start on the wiring. until then, all i can do is the research and parts gathering