not to be rude.....

[pilmpd]

but does any one really truely, actually know how to wire up and rb20det into an 91? my problem is that i have and uncut engine harnes but i dont have the harness to that runs off of the battery back to the dash area to get power to the ecu..... Wha the hell do i need to do to get this thing running. And please, what ever you do, dont tell me to search. I have read all of the faq to be found on numerous web cites. none of which appear to bo 100% correct by any means. Please help me out, im running out of time.

[Joe]

welcome to the world of a RB swap dudeinformation is scattered throughout the internet and none of it works 100% on every swap

my advice is get a service manual and all the diagrams you can find and just make it work. its very simple to wire.

[skillzilla]

i dont have the harness to that runs off of the battery back to the dash area to get power to the ecu..... Wha the hell do i need to do to get this thing running.

Im not sure what harness you are talking about. There is the EFI (aka upper) harness, which connects at various points on the engine and goes through the firewall to the ECU, and there is the chassis (aka lower) harness that connects the starter alternator, and battery and also has a few wires from the transmission on it.

I dont think you have an uncut harness if you dont have a harness connected at the ECU, thats the eseence of uncut

[pilmpd]

its uncut.....just tell me where you got your power for the ecu and where did you get power for the fuel pump. those are the only two things that i need to know.

[Bluefire]

For the RB25 there is white plug next to the ecu plug. If the rb20 is similar, the ecu will get power through one of the wires on that plug. As for the fuel pump, it is powered through the engine bay fuse box, which holds the relay and fuse for it. The ecu grounds the relay to turn the fuel pump on. Get yourself a 91' 240sx Factory Service Manual, and search for an RB20 wiring diagram. Whenever I start on a new project car, I always get the FSM for it first. 99% of the time it will have the answer your looking for

-Bluefire

[JonPowell]

I know....and for $250 I will handle it for ya. Just send me the upper RB and upper KA harnesses, let simmer 2 weeks and install.

[Carl H]

if you really have no idea how to wire in the rb20 into a s13 then aim me at psykodragoon and i will send you the wiring guide i did.it comes complete with pictures so even the most sexua.....er wiring inept can figure it out.

[JonPowell]

I posted your guide on my Yahoo site but if he cant figure out how to find that he cant wire it... HA HA HA

[BoostFab]

its uncut.....just tell me where you got your power for the ecu and where did you get power for the fuel pump. those are the only two things that i need to know.

look like you have no clue....send it to JON !?!

[JonPowell]

Go to the link in my sig....go to the files section....look for the file "So you wanna....." and if you STILL cant figure it out its time to open the wallet.