Quick Wiring Question

Im pretty sure this is a dumb question but from my understanding everything ive read about the wiring of swapping an Sr20det into your 240sx just requires you too litterally cut over 30 individual wires and add more wire(extend) and move it to the other side of the firewall to the passenger apartment. And then just remove and replug certain pins correct? If thats all there is to it how the hell is it so difficult? The two friends that I have with SR20's sent there harnesses off to someone else to extend and solder etc. for around 300$ and told me "No dude its real hard man and u need to understand wiring diagrams blah blah blah" If its just extending wires and etc sounds easy too me just time consuming. I guess what Im really asking is the part of the wireing harness you need to extend EVERY LITTLE WIRE MUST be cut and re wired right? And how many wires are there?

Anybody?

What you have to do is connect the engine harness to the chassis harness so you need to find out which wires to connect to which other wires with the wiring diagrams for the 240 and the S13.

ooooooooooooooooh I got yah, So youve gotta figure out that and extend the engine harness wires too connect to the ECU right? (Dude bare with me) So you take the SR20 engine harness and Splice it into your chassis harness and also extend it?

S13

As simple as cutting off all the power harness plugs on both engine harnesses (5 plugs total), and grafting the KA power plugs to the SR harness.

The power plugs have numerous wires each (~8 wires per plug or so), and a few of them are thicker gage (14 gage as opposed to 18 gage). The thicker wires are blue / red and black / red. You should notice also the A/C power wire blue / green, and a black / yellow wire as well on the connector (it will be grey, the other is brown, located by the battery).

Splice color to color, except on the blue / red and black / red wires you will need to take both wires and "Y-them" into the single black / red on the SR harness.

The sole brown wire is the 02 sensor power wire, I would suggest leaving this un-connected until you can source an IGN ON 12V live wire.

Extend the MAF wiring as needed, you will want to do this after the install. USE SHIELDED WIRE, slight variances in MAF voltage equate to alot of change, and the length of the wire makes it vulnerable to electric chatter. If you run the MAF wiring in front of the motor along with the CAS wiring you will shorten the length.

I have never had to extend the 02 sensor wiring, I simply ran it behind the engine and it plugged right up.

Once those connectors are wired you are done with what is required to make the engine run.

www.240faq.com ... I'm working on making an SR swap faq based off of my 89.

damn thanks dude I just copied and pasted that to notepad lol. any way I found nissanperformancemag.com and they have an entire illistration and step by step of the wiring you mentioned except the thing about the O2 sensor. So thanks alot man I appreciate it. But still though it really doesnt sound all that difficult. Ive wired up stereo systems and etc. before all through out the car it just doesnt seem like this wiring is a huge deal compared to what people have been saying. Yah just yah know cant fuck up.