Ive looked at the schematics, and from what I can tell, I can easily trick my Auto computer into working with the T-5.
But sometimes I see postings on other sites that say "Only use the correct computer" or that the computer makes a big difference.
1. Can someone explain to me, aside from electrical, what differences there are in the computers?
2. As long as I wire up the starting circuit correctly, why does it matter if I use an auto or manual computer?
3. Why is the A9L so sought after?
Thanks,
-dz
I've used an A9P in my manual car for years, I did try a A9L and the a9p seemed to hold the rpms slightly while shifting gears, it had a very very small delay when the rpms came down. The A9L rpms always fell like a rock when off the throttle. Not sure if thats how they all are but the two EEC-IV I had behaved like that.
I'll speculate and say the A9P is setup like that to keep the car at a nice idle while in gear at a stop light?, or to make the car shift more smoothly with the AOD?
Also I think A9L are more popular among tuners of custom chips
That is exactly it. The Auto EEC's do that to keep the car from stalling when it comes to a stop.
I was told the A9p will work with auto and manual,and the Speed Density DA1 will work with both as well.I use an A9p as well.
I was always told that you can use an automatic ecm with a manual, but not vice-versa. It probably doesn't matter too much either way though. I have an A9L in mine cause it's a manual.
I really don't believe the comp. knows when your shifting.
The 9L can tollerate idle rpm better with "flucsuation"
I don't think thats a word! but whatever.
i thought it was the other way around? autos have all that rotating mass to keep the engine revved up and full of momentum during a shift. if you put that comupter in a manual and push in the clutch the revs should drop alot further then u want them to. so basically, the manual feeds the engine a little more fuel during shifts.
So,what's the bottom line?
I tried both in my 5 speed car. The auto computer seemed a little sluggish down low compared with the 5 speed computer. Fuel economy was unchanged and they both idled the same so I kept the L and sold the P. Might have turned out different if I had an auto tranny but I dont know.
There really isn't much difference in either... BOTH will hold the RPMs up when coming to a stop(assuming you have a working speed sensor)...
I my Bird the A9L gives far better driveability without the 1500 RPM bucking I get with a A9P or C3W1... According to a tuner guy I know, the manual transmission EEC has a slightly richer curse mode, to eliminate bucking in the manual cars(which my mostly stock 5speed Stang did with the A9P)...