1988montecarloss

iTrader: (6)

i plan on putting a 4.8/5.3 3rd gen motor with a turbo into my 71 monte and i know everything ill need regarding getting the motor in the car, mounted up and hooked up to the th350 but im not sure whats involved with the wiring having never messed with an EFI car before, i plan on getting a motor with a full harness and running it with an msd 6ls box and an MS1 or MS2. now my question is, if i have a motor with a full harness and buy the msd 6ls box/harness for that and a megasquirt what else will i have to buy, if anything to finish the wiring? and what exactly will have to be done to the wiring? thanks for any help you can offer

1988montecarloss

iTrader: (6)

anybody?

tryinggenIII

don't worry about the msd, ms1 or ms2. get a stock computer to match your engine parameters and a wiring harness ( set up for stand alone) and tune original ecm. the gm gen iii/VI are incredible and will take any tuning you'll need.

1988montecarloss

iTrader: (6)

can i buy a wiring harness set up for stand alone? or what would i have to do to the factory harness?

tryinggenIII

you can set the original harness up for stand alone or have someone do it for you. It takes 3-8 hours to accomplish depending on how involved you get. the first harness i did took me 3 hours, because i just cut the wires i didnt need and took the pins from the ecm. I wouldnt recommend doing it that way, but its an option. I would recommend getting a wiring diagram for the year harness that you end up with and mark the wires on the diagram that you arent going to use and take them all out and then label all wires that you do need (12v+key, 12v+konstant, grounds, vss, tach, mil, obd2, starter, fan, fuel pump, etc) there are many people that do it for a living, just search and you will find someone.

1988montecarloss

iTrader: (6)

alright, so modify the harness for stand alone, get the motor/turbo in the car, and tune the ecu and i should be all set? know of anywhere that can tune gm ecu's in the new england area?

tryinggenIII

Sorry, don't know anyone tuning in New England, but I'm sure there is someone

psiconversion

iTrader: (5)

You may be able to find a tuner through the HP Tuners or EFI Live boards. Also, if you plan on changing the truck intake for a car intake make sure you factor those connectors into the cost. If you decide you want to buy a standalone harness, give us a call.

Jon
PSI

BMF_Racing

iTrader: (6)

If you do your own harness this link below has alot of good info to walk you though what needs to be done.

http://lt1swap.com/2000harness.htm


Its really not that hard to work through the harness and get it all cleaned up, just need to be patient and take you time and it will be fine. Either way, good luck.