w58 swap questions

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w58 swap questions

Post by 86cressy on Tue Oct 28, 2014 10:56 pm

Hi there, I'm planning on swapping a w58 5 speed into my 86 cressida and just had a few questions.

First i was wondering if its possible to do the swap with the engine in the car? Mine has the 5m if it makes any difference.

My biggest concern though is the electrical side. Whats the most simplest thing to do so that i still have reverse lights and that it'll start and run? I'm not concerned about cruise control or anything, i just want it work with out being a mission as electrical is not my forte.

Im only 16 but fairly mechanically inclined, so the most basic information and terminology is appreciated.

thanks

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Re: w58 swap questions

Post by BoxyShazam on Wed Oct 29, 2014 5:18 pm

Yes you can do it without taking the engine out. If the plug for the reverse lights won't just plug in, splice the wires together. Then ground the wire for the park/neutral safety switch. Done.

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Re: w58 swap questions

Post by 86cressy on Thu Oct 30, 2014 1:13 am

Ok ill start with and let you know how it goes!
thanks

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Re: w58 swap questions

Post by heff on Tue Nov 11, 2014 5:07 pm

Can you elaborate on grounding the neutral safety switch? That's one thing I never did on my swap. Is it one of the wires from the tranny under the car or one from the pedal or to the pedal under the dash? Here's an old link I have about wiring the reverse lights.
http://www.supraforums.com/forum/showthread.php?164088-How-to-5spd-conversion...-wiring-%28reverse-ABS-clutch%29-info&s=
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Re: w58 swap questions

Post by BoxyShazam on Wed Nov 12, 2014 9:31 am

Found this on a supra forum. Should be similar
"Once the transmission is installed, you will have to trick the car into thinking it's in park or neutral so it will start. My method was to simply plug in the neutral start switch (which can be removed from the side of the auto-transmission) and dial it to the P (park) setting. My switch now lives in the engine bay, tucked by the cruise control module. It makes an effective (if unnecessary) method of immobilization, as turning the NSS to any setting other than P (park) or N (neutral) will not allow the car to start. If you wish to be more professional (and you do, don’t you?), take a peak at the related wiring diagrams for your year vehicle. A little work on your part can provide a very clean solution.

From what I’ve researched (you’re lucky I’m so nice), the reverse light plugs differ between transmissions, meaning that once you get your fancy new 5-speed transmission installed you’ll find that you can’t plug in your reverse-lights. Some simple wiring or harness modifications will alleviate this problem.

Cruise Control:

Using the above method (of tricking the car into thinking it’s in P or N) will break your cruise control, which is unfortunate. The suggestion below will require some analysis of wiring diagrams to make sure you put the right wires in the right place. This is another one of those things that requires intelligence on your part, good luck!

Wjanusz had this to say about retaining cruise control:

Find the neutral start switch wires and run them to the clutch pedal switch. You will have to push in the clutch to start but you will still have cruise control. If you leave the old switch in park or neutral or splice in a switch the car will permanently think it's in neutral and cruise will not work. BTW at speed with the cruise on, the cruise will disengage if you hit the clutch.

In another thread, Wjanusz further elaborated (what a nice guy):

Using the existing switch and putting it in the engine bay will work for getting it started but you will no longer have cruise control. If you take the neutral start switch wires and hook them up to the clutch switch you will have cruise. You will have to hold the clutch in to start but that should be normal behavior.

The reasoning behind this is that if you permanently connect the neutral start switch (splice them together, kill switch or using the old switch permanently in park) then the car always thinks it's in neutral or park and the cruise will not work. If you use the clutch switch then the car thinks it's in neutral or park with the clutch in and thinks it's in drive when the clutch is out. When you're at speed with the cruise on, the cruise will disengage if you hit the clutch. Sounds correct to me.

My neutral start switch wires were black and white and thicker than the rest of the wires. Not sure if it's the same for all years. And they were both in the plug with 3 wires. The 3rd wire seems to be the reverse wire by the way But check everything before cutting and splicing if possible."

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