ok, so i have been convinced that the ECM i need to run for my swap is the 7730. the basic research i have done is that it is much faster, more tunable, and flexible than most the other ECM's that i could use. the motor that i am swapping is a bone stock 3.4 out of a 95 firebird. i hope to retain as much of the stock snsors and such as possible. the motor came with them, supposedly ran well, and its paid for. it also came with most of the stock harness, so i have the connectors for those sensors as well.

what im wondering is:
1. the 7730. will it be compatible with the sensors i have.
2. what all sensors, etc does the 7730 require? im planning on retaining the DIS, so the list of stuff i know i need to retain is: crank sensor and coil packs, TPS, IAC, water temp, IAT, injectors, O2 sensor. any others? emissions arent required.
3. what should i get a donor harness out of to make this easier? (its not going into a third gen, by the way)
4. does anyone have a list of what all the other service numbers for the 7730 replacements and the applications i can source this from? i havent found anything other than 3.1 camaros.

thanks
Michael

 

Well from the research i have come up with is the 7730 will work as well as a 165 ECM. Depending on your year of car your stock ECM will also work. I'm getting rid of teh 302 and doing the 165 swap as soon as my burner and chip arrive. Its a pretty straighforward swap though. The 3.4 just bolts right in. There is a wiring diagram somewhere on this forum about DIS wiring. The DIS module is looking for the same signal as the dizzy is. As for the harness, I would grab one out of any firebird or camaro of the year of your motor. If you have access to the donor car that the engine came out of just grab the rest of the harness from it. What are you putting this engine into? If its an S-10 truck it may already have the 165 ECM and you just need to burn a new chip for it.

 

We're going to need the year of your existing car as well, so we can tell you what to pick up in terms of parts. I'm going to assume you have a 302 ECM. Swapping to the 730 system will be easier when you get the old engine out, but there will still require some adjustments to the harness to make it work. You have 2 options there. You can either use an FWD MEMCAL and bin to keep your DIS on the 3.4, as it's already set up (and this will make things easier if you want to build a hybrid later), or you can keep your distributor and burn your own MEMCAL just to make it work (stock RWD 3.1 MEMCAL REQUIRES a VATS module and key to work unless you burn your own chip to delete VATS).

:edit: Donor harnesses are in 90-92 F-bodies, but still require modifications to 2 major connections to work.

 

the motor is actually going into an s10. i come to this site because the quality of the tech is much higher than any other site save for the 60degreev6 board. the motor in the S10 is a 2.8 TBI, so nothing is going to be retained. im actually rewiring the entire truck around the MPFI and DIS swap. theres enough hack jobs in the harness to justify it.

and does it count to call my truck part camaro as im running LS1 camaro front brakes, IROC rear, trans am seats, IROC wheels, and soon to be a camaro motor?

thanks for all the help over the years, guys.

Michael

 

You'll need to get your hands on some connector info for your truck, namely the bulkhead connector. You may have difficulties in the differences between the 2 harnesses. I hope that there is a 15-pin connector under the passenger's side of the dash, or there is going to be a TON of rewiring involved to either swap half of the power connections in the harness to the bulkhead connector (there is room for this but it's a pain), or installing the 15-pin C207 on the passenger's side of the dash somewhere near the glove compartment.

 

may not even wind up reusing a bulkhead connector. ive never liked them from my experiences with mopars. the GM ones are better than most, but if i can di away with it during the rewire, i will.

what im planning on doing, and want to do, is this:
get a 7730 ECM. find a donor harness for my motor, and get the thing wired up like a standalone harness. then ill fire it on the test stand to make sure everything is goo. ill start rewiring the truck around the standalone engine harness at that point.

thats why im looking for a suitable donor vehicle for a harness and ECM, as i have neither.

Michael

 

The C100 bulkhead connector has about 20-30 wires in it, so it would be a little difficult to get rid of. There isn't just stuff going TO the engine bay (most of which is in the C207 I mentioned)... all of the major power wires come INTO the fuse panel and ignition switch through it, as well as the sender wires for the instruments and dash lights. Don't forget your front end lighting harness comes through there as well (unless you won't be using the lights, of course).

:edit: Besides, I seriously believe Mopars were designed from the factory to fall apart...

 

This should get you in the right general direction for repinning the ecm. You'll need to get a pinout for your ecm and figure out the repin yourself. This kind of question should really be in the diy-prom board. I'm going to ask a mod to put it over there.

 

i had thought about that section, but sice it wasnt tuning specific, i thought it went better here/ id be more than happy to have it moved though.

and im looking forward to this project, once i get some more parts collected.

 

hmm..couldnt he leave the pre-existing wires alone? The ones for the lights,ignition switch and such that pass through the bulkhead connector and just drill and grommet a hole for the ECM harness to pass through? I think thats what I would do rather than try and rewire all that since those wires are not ECM specific or am i wrong? Even so, that particular ECM could be mounted under the hood anyway right? If so then no holes need be drilled. Just find a safe place underhood to mount the ECM, then run the harness from there making any critical electrical connections that need to be made into the cabin by splicing into the harness that is already attached to the bulkhead connector. Seems reasonable if you get yourself a good schematic.

 

My point exactly... But, why drill and grommet a hole when there is already another pass-through? It's not like that particular "connector" (passenger's side pass-through) is actually a connector at all... I've ripped mine apart and all it is is a pass-through for the ECM and engine wiring. He's still got a decent rewiring job ahead of him, so I guess we'll let him do what he's going to do.

 

well if his original wiring is hacked up, i could see taking a bit of time there. Didnt think about that pass through. Its been a while since i messed with an S-10. Ever since my buddy dropped a 383 in his(hes sick). But ya youre right about it. He could mount his ECM in the cab somewhere and just run the harness right through that.

 

I moved this thread to the DFI & ECM board, much better fit for the topic.

Some ideas on a standalone harness. Both the under hood '7727 and the interior '7730 ECMs where used on a bunch of cars. However, most of them are front wheel drive. So the harness isn't going to be quite right.

Best bet is to get a harness from a '90 - '92 Camaro or Firebird with the 3.1l engine. This would be for the interior '7730 ECM. If you could also get that ECM it would help. Or, at least get a '7730 from a V6 car, even if it is front wheel drive. This will provide the proper MEMCAL for your engine (as close as it gets).

The f-body harness will be set up for a longitudinally mounted engine. So the harness will be the easiest to use.

RBob.

 

well, couple of things.
1. thank you for moving this to the correct forum. and thank you all for eing willing to help an s10 guy thats doing something different than bags and bodydrops.
2. the harnesses: the factory harness in this thing is pretty hacked. i dont yet know how much i will be replacing, but i do know that the harness in the engine bay is made into one section. the computer passthrough on the pass side firewall also feeds things that conme in through the ulkhead, and vice versa. big wiring project on this swap.

3. i managed to score a free 7727 PCM that had been powering a 88 vette converted to SD. it also came with a wiring harness for a TPI setup. i have no idea who made the harness, but would like to use it as a start. i have also aquired all my programs and bins for this computer to make a v6 chip for it.
what i need yet is the pinout for th ECM, and maybe a clue on who made my harness so i can get a diagram from them so as to modify it for my V6.
id probably do just as wll starting out from scratch with a pinout diagram and a factory wiring diagram, though.

thanks for all th ehlp so far. please, keep it coming.
michael

 

165, 730, 727 pinouts: http://chevythunder.com/fuel%20injec...ecm%20#1227727)

Now, if only I could find one for either the 16196401 or the other one I plan on swapping to, I'd be all set.

 

cool. thanks.

looks like ive got a good start for when i get the rx7 out of my bay.

m life cinsists of wiring lately.... doing a full harness, 89 rx7 with 383 and tko600

michael