hey im putting a oldschool 383 with a 700r4 in my 86 iroc, im wanting to get rid of the computer setup completely and do a wire hide on the remaining wires... there is a LOT i dont know about the wiring, any complications im going to run into?

 

Welcome aboard thirdgen.org.

What engine was in the car from the factory?

 

it had a 305 tpi not sure on the trany

 

If it is an automatic, it is a TH700R-4 (or TH700, or 700, or many other such abbreviations).

Reason I asked is it will have an in-tank electric fuel pump. The computer runs the pump. If you remove the computer, you will either have to supply another means of turning on the pump, or drop the fuel tank and remove the electric pump.

The computer also locks up the transmission torque converter clutch (TCC). If you run that transmission, you will need to provide means to lock up the TCC. You can buy a kit, set up a switch to lock it up manually, or wire it up (with a valve body switch change) to lock up when in 4th gear (overdrive).

The computer harness can be removed intact. Drop the computer and disconnect the harness connectors to it. The part that goes to the kick panel can be unclipped and pulled out through the fenderwell (removing the plastic fenderwell liner makes this much easier). Pull the harness up out of the fenderwell from the engine compartment, remove/disconnect everything connected to it, and you'll have it all out. You'll have to do something with the hole in the kick panel, but the rest of the wires you need will still be in there (the TCC lock-up harness is part of the computer harness).

Of course, removing the computer is emissions-illegal in all 50 states for street/highway use. . .

 

i decided to keep the electric fuel pump and just run a regulator on my return line, not sure how well it will work lol. i planned on wiring it up to my ignition so it kicks on when i turn my key, but at that, will i need a new ignition since it has that chip in the key? also i think most if not all of the instruments are computer ran, any way i can hook them up manualy or would it just be easier to replace them? and the manual lock up switch for the TCC, would i have to switch it every time i wanted it to engage, if so where can i find the valve body switch assembly? thank you for your time

 

The stock TPI pump with a return-style regulator will work, but will probably not keep up with a healthy 383 under sustained full power. A Walbro 255 reportedly will handle a good amount of HP.

Setting the fuel pump relay to engage when the ignition is "on" is the typical route.

"Chip in the key"? An '86 shouldn't have VATS. Are you sure about that?

None of the instruments go through the computer. They go through the C100 harness/connector (except the volt meter - that just gets accessory voltage in the dash circuit) in the back driver side corner of the engine compartment. Ditto ignition power. None of that should be disturbed when you remove the computer-related harness.

The TCC lock-up is pretty simple, the most difficult part would be identifying a normally-open single pole 4th gear pressure switch. The one in there now is normally-closed (if memory serves). I know other models used the normally-open single pole because I managed to get my hands on one in the transmission currently in Berlinetta #1, but I don't know what the transmission came out of. And, I recently divested myself of the transmission with which I swapped the switches & internal harness. I believe more details of this set-up can be found on the Transmission & Driveline forum.