AUTO TO MANUAL

[twiztidkilla]

i have a 90 240sx thats automatic... im wanting to do a manual swap in my auto 240.... what im needing to know... is... is there any other things i need besides the transmission, slave, resivour, lines, pedals, ecu and such... will the auto engine work with a manual transmission???? ive been told the bearings might be diffrent and are there a diffrence in the length of the drive shaft??? and are there any holes i need to make for the fitment of things???? im just looking for some info and other parts i might need.... any help is greatly appriciated... thanks

[HomeCheese]

The driveshaft is different, it's a bit shorter. You need flywheel, clutch and all that good stuff. Master cylinder, gotta have that. There's also a few pieces of the interior that are different.

[justmerging]

SEARCH!

But here's the list that I know of:

DriveshaftTrannyThrow out BearingClutchPressure PlatePilot bushingFlywheelClutch slave CylinderClutch Flex lineClutch hardlineClutch master CylinderClutch pedal AssemblyAnd a little wiring know-how to get everything to work.

[twiztidkilla]

what kind of wiring am i looking at doing?????

[250sx]

you need flywheel bolts too.

[wickiewicked]

as for wiring only the reverse light sensor on transmission and bypass the neutral switch so you can start the car you do not need a manual ecu.

[twiztidkilla]

now... on the neutral switch... is that just jumping the 2 wires or do i need to get the switch and mount it also with the pedal?? it seams pretty strait forward on installing....also.. why is the manual ECU not needed??? and am i going to have to take the auto trannys wiring out of were the shifter comes threw the floor??? and what kind of interior pieces am i looking at having to change???? if any

[HomeCheese]

I didn't do the wiring for mine, my stepdad did that, so I don't know too much there. I do know that you also have to wire it so that you can get the key to release, since it has to be in "park".

[twiztidkilla]

does anyone know how to do the wiring for the conversions like for the reverse light, neutral switch, and park sensor??? are the neutral and park switches just jumping the 2 wires????

[twiztidkilla]

anyone did the wiring for the auto to manual conversion??? what kind of wiring is it??? just jumping the neutral and clutch switches and rewiring the reverse??? and also... why isnt a manual ECU needed???? thanks

[Battousai4884]

Also very interested in finding out. Can we have a write up on this very popular subject?

-Hitikori

[1991S13]

The wiring is really simple, all you NEED to do is bypass the park/neutral swtich, and wire up the reverse lights.

To do the park/neutral switch, there is a two wire connecter under the engine bay fuse box. It has a thick white wire, and a thick black wire going into it. Cut both of these, and permanently cross and connect them. Now the car thinks it is in park at all times, and will start.

To hook up the reverse lights, there are 3 plugs behind the engine bay fuse box (2 gray, 1 brown). The middle plug is the inhibitor switch, and has quite a few wires going into it. You need to cut the green/yellow striped wire, and the green/blue striped wire a couple of inches before the plug. Now run a wire (16 gauge?) from the green/yellow wire to one side of the reverse light sensor on the transmission. Now do the same with the green/blue wire, going to the other side of the sensor. It does not matter which side they go to.

As far as interior wiring, when you remove the shifter all the wiring goes with it. I had to cut the wire that goes up through the shifter to the Overdrive switch, but everything else unplugged and came right out. I will attach a pic showing how it looks after everything is removed.

You do not need any interior pieces, besides the shift knob/boot. The plastic piece that goes around the shifter, and up around the radio and heater controls has 4 screws in the bottom that hold in a round piece that goes around the shifter. Remove that, and the MT shifter and boot will fit in.

There are some very good writeups on this floating around NICO, search and you should find them. I used one and went step by step and have had no problems (so far).

If you have any more questions email me, IM me or whatever you want...Good Luck!

[twiztidkilla]

ok... i have got everything except the interior wiring.... do you just cut the connections off and tape the remaining wire to the rest of the harness or how should that be done???

[twiztidkilla]

and another question.... why dont i just take the wiring from the park/neutral switch from the auto that plugs to the shifter out run the wires back and wire it to the neutral switch on the pedals of the clutch??? that seams alot easyer than pullin the fuse box out and splicin those wires together.... and i dont really understand why i need to jump those 2 wires for the reverse lights shouldnt the manual come with the harness for that to just plug into the plug that sits on the back of the fuse box??? im just lookin for the easyest way to do things....

one more thing... how is the master cylinder sit in there for the clutch.. it seams that theres not gonna be to much room to fit that in there but i dunno.... havent seen a manual setup in the engine bay... i shall check it out...

[1991S13]

As far as interior wiring, I just left the plugs in there and tucked them under the carpet. Put the console on and no one will see them hanging.

Im not really sure about wiring the park/neutral switch to the clutch pedal, that sounds pretty complex and time consuming to me. I finished wiring the neutral switch in like 5 minutes the way I did it. Jumper the two wires together, and you're done. You dont have to pull the fusebox out, just unplug the 3 large plugs behind the fuse box so you can get to the small plug on the bottom (which is the park/neutral switch).

The reverse lights dont get jumpered together. When I took out my auto, I cut the 3 groups of wire that went to the transmission. When you do that, you unplug those 3 harnesses behind the fuse box and pull them out. All youre left with is the 3 plugs. You cut the blue/green and green/yellow wires coming out of the back of the middle plug. From the wires coming out of the fuse box, run a wire to each side of the reverse light sensor on the manual transmission. My transmission sensors were all cut with only about 6 inches of wire dangling, so I do not know, but I dont think they could just plug into the plug behind the fuse box. The plug it comes out of isnt just for the reverse light sensor, it has a group of like 6 other wires that run to the auto and I dont know what they do.

Sorry I can't answer your master cylinder question, I haven't mounted it yet. Look under the dash and you will see where it belongs, there is a large circle with two smaller circles on each side of it. This is where it mounts, so just look at where it is in the engine bay.

Im not trying to say my way is the best and only way, but it is the only way I could find to do everything. It was really simple, wiring took like 10 minutes, hardest part was unplugging the plugs behind the fuse box. Also, dont forget to plug the speed sensor back in. Its the little (brown I believe) plug that hangs down on the passenger side of the transmission. Plugs right into the manual, the long wire that goes from the back to the front of the transmission with the plug on the end. My cardomain page will have all the info (with a good amount of pics) when I am finished, which should be this weekend.

[twiztidkilla]

alright... i understand it better now.... one thing tho... on mine i can only find a blue and green wire and a green and white wire.... not a green and yellow wire... let me look a little more... i have a doner car that was an auto so im going off of that to look at the wiring....

[twiztidkilla]

are there 4 wires or 2??? that run for the reverse lights?

[1991S13]

Only two wires run to the reverse light sensor. Here is the link to tenkawa akito's write up on how to do the swap. It has pics of the back of the inhibitor switch and the wires you need and everything.

zerothread?id=77784

[twiztidkilla]

aright... that just confused me even more.... ill just find a manual car for a project ride and worry about this auto one later....

[1991S13]

You dont have to wire up the reverse lights, if thats all you are worried about. The only thing you absolutely have to do is jumper together the neutral wires so the car will start. I wouldn't let reverse lights come between me and a manual...

[twiztidkilla]

true.... ill look around for wiring diagrams and what not... possibly a already 5 speed vehicle that doesnt need a whole lot of extra work.... the other thing that concerns me is the clutch master cylinder.... will i have to remove the dash to get that drilled and bolted up???

[1991S13]

Email me, I will send you the wiring diagram, if you want it.

You do not have to remove the dash, just wiggle up underneath of it. I reclined the seat all the way and got my feet up on it and it was kinda comfy lol. There is a green box with some wires plugged into it you unplug that and remove it for now (but you will need to plug it back in later). The top of the clutch pedal bracket bolts into where the bolt was holding that green box in was. If you look, there is a circle with two smaller circles on opposite sides of it where the clutch pedal bracket would be mounted to the firewall, you need to cut the big one out with a hole saw or something of the like then drill the other two holes. If it sounds confusing now, stick your head down there and look and you will understand.

I had to pull some of the black plastic firewall cover off the make the pedal bracket sit in there right.

[twiztidkilla]

yeah... i looked on my 240sx body that i had sittin in the back befor i took it to the crush and it looks pretty easy to cut out but it looks tight to get too... im beginning to think about not even screwin with the reverse lights... i dont know of anyone that would ***** to much about em not on.... but ya never know.... .my emails............... [email protected] if ya would like to send me the wiring.... thanks

[1991S13]

No problem.

Yeah, I don't think the backup lights are that important either. Just might cause a headache if you forget about it and get an inspection ticket or something.