Sr20det swap.....wiring!

[WestSlide240]

hey, so i have a question. I have a 89 240sx s13 sohc that im puttin a blacktop sr20det into. my question is which fuse boxes do i use and what harnesses do i use to complete this swap??? thanks

[blkvrtswp]

You will use all the car's fuse boxes.

Use the SR engine main engine harness (ECU, CAS, MAF, O2 sensor etc. - goes thru the firewall) and upper engine harness (injectors / coils etc. plugs into main engine harness).

If you have the SR lower engine bay harness (alternator, starter, reverse lights and speedometer etc.) you can use it but you can also easily adapt the SOHC KA or DOHC KA lower harness to work since almost all the plugs are the same.

For specific wiring, there are lots of forum threads just look in the stickies and search. If you are missing any big parts of the SR harness you can always buy a shiny new conversion harness from Wiring Specialties.

[WestSlide240]

Thanks! The main reason why i thought I had to use the fuse box is because on the sr fuse box theres the plugs for the wastegate solenoid control valve and etc... and i thought the ignitor chip was part of that wiring but its not. and i didnt know that you dont need the wastegate solenoid.....By chance do you know what happens exactly if i dont use it? like what does it do? i heard that it gives you less and more boost, possibly spikes in the boost? Thanks!

[blkvrtswp]

The OEM boost solenoid thing is useless. Nothing good comes from trying to use it. Trash pile!

[WestSlide240]

I have another question for ya.....the plugs that are on the ka24e fuse box, the box by the battery, I cut those plugs that go into the box and rewire them with the sr plugs so the sr wire harness plugs into it, right? Thanks!

[blkvrtswp]

Yes, for the ones near the nose of the car. 1 or 2 other plugs from the lower harness will plug directly into the lower engine side of the fusebox. There are step-by-step guides with pictures on FRsport.com and in the stickies at the top of the forum page.