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Old 04-22-2003, 23:21   #1 (permalink)
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AU auto mod to keep higher gears

I've spend about 2 days with multimeter and other tools working out solinoid activation time etc. and have found a way to keep the auto box revving right out until 3000rpm,(eg. usually take your foot off at 2000pm ish it'lll kick down gear) every gear. Switching then from to economy mode revvs out to 2 1/2(still a good improvement)I've found a lot more performace, taking over a piece of piss(no kick starting into higher gear). Still testing but will keep informed(updating to cruise control at the moment and installing momo at the same time).............................and a few beers too.........
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Old 04-23-2003, 05:29   #2 (permalink)
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I must be missing something in your post as my AU in power mode will rev up to 5600rpm off the line before hitting second
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Old 04-23-2003, 08:13   #3 (permalink)
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I think he's talking at half throttle, not full throttle? At least I hope so, or that's one sick AU.

It sounds like what you have done is to effectively program it the same as putting the adaptive shift transmission (on XRs) into performance mode.

What are the details of the mod. You have me interested!
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Old 04-23-2003, 14:53   #4 (permalink)
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Yep i'm talking half throttle, even 1/4 throttle. Revs into red line straight off the line. I switch back and forth and is so much better(fun) to drive.
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Old 04-23-2003, 17:33   #5 (permalink)
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Are you going to share?
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Old 04-29-2003, 15:36   #6 (permalink)
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The throttle position sensor has three wires, one of them is directly related to transmission gear selection, measured voltages from 0.6 to 4.5 volts(the higher voltage selecting the higher gear). Now if I disconnect that wire, the ECU changes gears only from tacho and speed inputs so the car acts like a manual, while its great to drive not excatly disirable. I'm looking at making a varible push button voltage supply that will input the specific voltage relating to each gear, making the gear selection fully selectable.
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Old 04-29-2003, 20:24   #7 (permalink)
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very very interesting making a note of that one for the future
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Old 04-29-2003, 21:20   #8 (permalink)
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If you are trying this on an I6 witht the auto integrated ecu, you will run into problems, as the TPS also controls accel enrichment and fuelling of the engine.
You will end up with 'flat spots' and possibly lose power from the engine.

With the v8's running the seperate ecu for the auto it may be possible,

The only way for the auto to hold gears longer, is by doing it manually.
Alternatively you can have the program on the ecu modified, however i dont think the AU program has been 'cracked' yet.

You may want to consider asking XR9Ute (Pete) for more info on what problems can be caused by d/c the tps input, and also he may have found mem locations to modify the shift strategy on EB-ED's.

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Old 04-29-2003, 21:30   #9 (permalink)
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There's 3 wires, the other 2 do that, the third is to kick the transmission to a higher gear when you plant your foot and to kick it down when no throttle. I've tested all of this.
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Old 04-30-2003, 01:36   #10 (permalink)
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am_bad

Yes theres 3 wires,

One is +5v
One is 0v or ground
the other is the signal to the ecu which varies between 5v and 0v depending on the position of the throttle butterfly.
At idle it should be around 0.6v at wot around 4.8ish

Take a look at the schematic in the gregorys manual.....

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