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Post by frankenstang on Dec 20, 2009 12:07:41 GMT -5
First off i want to say hello as a new member and Stinger, you are the Man! now off to business... I have been using the site extensively piecing together my info and parts needed for my swap. my biggest question is with the wiring (i may have over read it). I am using a 87-88 TC computer (Auto trans), vam and pigtail. the project car is a 90lx mustang. on the Swap page i am only going to use the link for the 87-90 wiring? there is no pin swapping at the computer just swaping the maf pigtail for a vam pigtail? lastly i want to use my a4ld until i can get the money for a adapter plate and v8 t5 (this is going to be a stockish daily driver) the wiring for the a4ld i think i found on the performance how to link. it shows pin location (ex. Pin 37/57 (VPWR) provides power (+) to the 3/4 shift solenoid and the converter lockup solenoid.) does 37 identify the stock mustang computer location and mean it needs to be moved to 57 of the TC computer? just wanting to clear everything up before i jump into hot water.
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Post by oneowner88lx on Dec 20, 2009 19:17:08 GMT -5
If you go to this page and click on '85 How Tos scroll down and click on 2.3 Turbo Swap you will find lots of wiring diagrams and other info on the '88-'90 turbo swap: www.flemworld.com/ |
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Post by Stinger on Dec 20, 2009 23:46:52 GMT -5
Yes, the 87-90 swap is basically just 4 wires.
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Post by frankenstang on Dec 21, 2009 20:48:14 GMT -5
stinger. is the yes an answer to my assumption on the discription given on the a4ld wiring as far as swapping pins. im getting close to having all the pieces for my swap and just checking and re checking i don't want to be caught with my pants down in freezing Georgia weather.lol
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Post by frankenstang on Dec 21, 2009 20:52:51 GMT -5
i have no idea what happen with my spelling disagreeumption . what i was meaning my "assumption" on the pin location from the lx wiring to the tc computer when using an a4ld.
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Post by Stinger on Dec 21, 2009 23:28:18 GMT -5
My statement was only about the engine swap, not the trans.
Pin 34 controls the 3-4 shift on the auto trans in the 87-88 TC, as far as I can tell there is no wire in the pin 34 location in the 90 Mustang. This means that's at least one wire that needs to be moved or added. Pin 42 is the kick down solenoid so that's another pin you need to look at on the Mustang. Pin 53 is the converter lockup pin so you need to look at that one as well.
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Post by Stinger on Dec 29, 2009 21:51:21 GMT -5
Here you go, when doing a turbo swap with an 87-88 auto ecu and an A4LD trans, here is the additional wiring for the auto trans:
Pin 37/57 (VPWR) provides power (+) to the 3/4 shift solenoid and the converter lockup solenoid.
Pin 34 (3/4 shift) When the computer grounds this pin, the 3/4 shift is enabled provided that the transmission speed is sufficient to use overdrive.
Pin 53 (CCO) When the computer grounds this pin, torque converter clutch is allowed to lock up. To prevent a rough feel, the coverter lockup is inhibited at certain speed upshifts and downshifts, brake on, cold engine, etc.
The above three connections terminate at a single 3 contact connector mounted on the transmission.
Pin 3 (VSSDIF+) One terminal of the vehicle speed sensor.
Pin 6 (VSSDIF-) Other terminal of the vehicle speed sensor.
The two connections above terminate at the two terminal connector of the vehicle speed sensor mounted on the transmission at the conventional speedo cable location.
So, that should be pretty straightforward wiring it up. Looking at the Ford manual for the A4LD and the wiring diagrams, it appears that having all this unhooked would just result in a 3 speed automatic (no overdrived, no lockup clutch on the torque converter.) So unless the transmission has some preexisting problem I wouldn't think it would cause any problems to operate it disconnected. But for best fuel economy and to lower overall engine RPMs most of us would like to have it all fully functional as intended.
Furthermore, the service manual refers to the solenoids and computer as a means to override (via the computer) the otherwise mechanical 3/4 shift and converter lockup.
So, if you just grounded the two solenoid terminals on the transmission and hooked VPWR to the common terminal on the transmission you would get 3/4 shift all the time and converter lockup all the time. In other words, leaving the computer out of the picture would give you a purely mechanical 3/4 shift and a converter locked all the time. (That would be a pretty rough shifting transmission. The computer is needed to negotiate smooth 3/4 shifting and converter lockup.)
If you did want to "manually" control the 3/4 shift and lockup you could hookup the VPWR to the trans and then have two separate toggle switches to ground the solenoids leaving computer pins 34 and 53 disconnected. You could then manually control overdrive and converter lockup but it would take a lot of manual switch flipping to approach a smooth ride...
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Post by frankenstang on Jan 13, 2010 15:44:19 GMT -5
is there a difference between the a4ld in the mustang and the TC? im sorry if i wasnt clear on which i was using. im trying to use the mustangs transmission. looking at the diagram for the mustang doesn't show the 3/4 shift or kick down solenoid. but does have CCO. is the 3/4 manual controlled and so there isn't a kick down or shift solenoid?
thanks
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Post by oneowner88lx on Jan 13, 2010 18:13:55 GMT -5
The Mustang auto trans only has the CCO.
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Post by frankenstang on Jan 14, 2010 15:23:12 GMT -5
well pin 53 is the same on the TC computer. so i don't have to wire anything for my a4ld from the mustang and i t will function just like it did as my stock 1990 2.3 lx correct?
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