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I did a search but didn't turn anything up... So don't flame me yet [Image: biggrin.gif]
Is the LA3 only from the TC's? And do I need one when I switch to a 5 speed?
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Walsted
Joined:
Apr 2001
Fort Worth, TX
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The LA3 was only originally in the 88 TC, as far as I know.
As far as NEEDing one when you switch to a five speed, that depends on what you mean by NEED. I'm pretty sure you could get away with what you have now, but there may be a few codes thrown.
Hope this helps.
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Mike Walsted - NATO member
1986 5-speed TurboCoupe and 1985 5-speed XR7
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What computer was in the 1987 5 speed model? I really would like to have the right stuff as far as the 5 speed and computer are concerned.
Thanks for the help
-Ryan
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Walsted
Joined:
Apr 2001
Fort Worth, TX
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The LA was the first one for the 87/88, then came the LA2, and finally the LA3. They are all swappable with each other, just a few differences as far as internal tables and BCS operation. I would get an LA3 if you can find one reasonably, (try RDOG - if he doesn't have a spare, he probably knows where to get one,) or get an LA or LA2 if you are going to control boost without using the BCS and want to save a few bucks, since they are usually cheaper if you don't get it from the salvage yard yourself.
Hope this helps.
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Mike Walsted - NATO member
1986 5-speed TurboCoupe and 1985 5-speed XR7
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Keith Nubel
Joined:
Apr 2001
Liberty Township, OH
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I have been told that the fuel and timing tables are differnet in the 5 speed. The auto has less hp and less boost. Something had to limit the power between the auto and 5 speed, so it would make sense that it's in the computer.
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85.5 TC 5 speed, Ranger Roller cam, 3" exhaust system, manual boost valve, large VAM, SVO PE computer, front mount Motorsport intercooler & sport grille, ported upper and lower intakes,flow matched injectors, ported E6 manifold, 245/45/17 wheels & Tires,140 mph speedo,Motorsport lowering springs, under restoration
1985 TC
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Thats exactly what I thought, and my auto currently only boosts to 10 PSI... Garbage lol
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Oh and I saw somewhere that the auto has a lower HP cam which makes the difference in 150 and 190 HP. I think the computer only controls boost, I could be wrong though. Its probably a regulator valve somewhere or something. Just guessing.
Ryan
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Rodger
Joined:
Jan 2002
Palos Heights, IL.,USA
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My understanding is that the auto and 5 speed engines are the same, including the camshaft. The lower HP of the auto is because of lower boost and possibly less timing advance.
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Chuck W
Joined:
Apr 2001
Indpls, IN,USA
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The primary reason that the autos have less power than the 5spds is the 5 pounds less of boost. The ECU controls the BCS and limits it. The rumor is that the auto ECUs actually have a bit more aggressive timing curves than the manual ECUs.
First, dump the ECU-controlled boost and install a manual boost controller. Problem solved.
Next, after you swap to the 5spd, leave the auto ECU in there and deal with the fact it will throw a code for no auto tranny. You could go as far as to pull the wiring for those inputs as well.
The rest is the same between the two.
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83 TC Clone, 87 Ranger 2.3T, 84 XR7, 80 XR7, 86 XR4 AND 88 Scorpio
NATO Member
83 TC Clone, 85 Mercury LTS, 97 Volvo 850 T5 Turbo, 78 Volvo 240, 93 F150
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Thanks for the info [Image: smile.gif] I'm still curious as to what reduces the car to 150 HP? Does the auto just suck up the HP or something? lol
Ryan
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