Ok so I have been reading the sticky on this and have some Q's.
will any 411 pcm work ? will it run without major tuning?
what year harness is easiest to adapt? can I adapt my tpi harness?
is there serious wiring involved ? mostly plug in play? what about injectors?
my car is an 88 model with cable speedo how will I make my gauges function?
I ask these Q's because my trans is out and have a 4l60e and would like to use it as well as save some cash and make my car run better. parts are not an issue I can relatively get these parts easy.
any straight forward answers would help me out a lot. I was trying to email s10widside but no luck. would appreciate any pics on this to as the treads pics will not open. thanks guys

 

Read the sticky. The whole thing. After I read it I made the leap. I was gonna run a 96 computer but the lack of support sucks. Tuning required. Lol

 

Yes
Yes. However, you must load a 2001 or 2002 Express Van calibration into the PCM and change spark/fuel parameters to be better suited toward your engine combination.
A TPI harness does not have all necessary wires (it's missing a lot of wires) to do the conversion. Any LS-Series harness is too short to work with (unless you don't mind a lot of splicing). EFI Connection can build you a 99% plug and play harness for $750.00.
Your injectors are fine.
Speedometer function is unrelated to the conversion. Your tach *should* work, but if it does not, you can use a $100 Dakota Digital tach converter.
You must (must, must, must) have a 1996 or newer 4L60E...or update an early 4L60E to 1996-newer internals.
Hmmm...must not have seen your email. Sorry.

You may find my upcoming book to be helpful. It can be pre-ordered through Amazon.com or through eficonnection.com.

 

I have had trouble with info how to modify the earlier trans. Pwm solenoid and another?

 

Efi connection now doing harnesses? Is that for only the early years? I was told last month they were not for the later year thirdgens.

I am in the middle of my swap. What i did was buy a spare tpi harness to cut up, and a factory fbody ls1 harness and ecm. You really only need the coil pack connector pigtails if you are doin coil packs, everything else you really dont need unless you run ls1 maf sensor. With the efi connection 24x ring and crank sensor, and the vortec dizzy with cam sensor, they use their own pigtails. Ls1 pigtails do not fit. If i had known that, i would have just bought pigtails instead of a ls1 harness. Think it would have been easier.

You then would just need pins for the wires to plug into ecm connectors.

I took the spare thirdgen harness and trimmed out all the stuff i dont need. Basically keeping the c100 connector at firewall, and keeping only few strands for the stuff i have left like wiper motor, washer bottle, oil pressure, fuel pump relay, main ignition/starter feeds and sensors for gauges.

I happen to run ls1 tb on my sbc so i took ls1 harness injector wiring and tps/iac sensor pigs and thats about it. They seem to share same cooolant temp sensor feed. I have a universal gm iat sensor and 3 bar map with its own pigtails i plan to splice in, just how i did with factory tpi harness and ecm.

So there is alot of wiring but doesnt seem hard. Just time consuming unless i am missing something.

If you ignore emissions and ac and cooling fans, basic fuel and ignition control is simple enough. My fans are on separate switches. I have ls1 fans too so i could easily run them thru 411, if i feel like redoing it. Most of time however i gotta run my fans all the time in summer so easier to flip switches and forget about it.

As i make some more progress i will post up pics and information on how i did it.

 

1985-1988 F-Body only. $750.00 harness.

Occasionally the $400.00 rework service is offered for the 1989-1992 F-Body, but only when workload is light. During this time of year, workload is not light. To clarify, a 1989-1992 F-Body harness for LS1 PCM is a $750.00 harness plus $400.00 rework service for a plug and play install. It's a big job and pricey.

 

I am not sure what the difficulty is between 89-92 vs 85-88 as i go thru this process but you obviously know the process more than i do. Lol you basically created it. So now it makes me wonder what i am missing in my build or what i may have overlooked. Unless you mean timing consuming when you state its a big job? I will need to double check my works so far but my setup is more stand alone and other auxiliaries aka fans are completely separate. No emissions and ac must really make things less involved? I agree the soldering extensions in will take some time but thats not terribly difficult. I appreciate the help you have given me so far. Will keep you posted.

Quick side note, it appears the plastic vortec cover will seal up on dart shp block. Rtv edge engages plenty of block sealing surface. The seal around oil pan and timing cover with 1 piece gasket and rtv at the edges should do the trick but wont know until it is up and running.