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BTR Automatic Shift Differences 

 

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 Post subject: BTR Automatic Shift Differences
Posted: Tue Apr 19, 2011 12:21 pm 
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Ride: EF XR6 Wagon, AU2 XR6 VCT

Power: 148 rwkw

Location: Auckland
New Zealand

I have EF1 and AU2 XR6s, both with BTR autos and 3.45 diffs, but they shift very differently.

The EF up-shifts quite loose at full throttle, while the AU (with ESS) shifts smooth at low-mid throttle, but hits hard (very nice :twisted: ) at full throttle - really gotta be careful in the wet.

The EF manually up-shifts and down-shifts almost instantly at mild throttle, but the AU can take up to 4 seconds to make up its mind.

When manually down-shifting under engine braking, the EF is tight, almost banging into lower gear. The AU takes forever, then gradually slides into the lower gear - like slipping the clutch on a manual.

Is all this normal for the two models? The shift programs must be radically different. Any way I can speed up the manual changes on the AU?

There's 215ks on the AU and 290ks on the EF. The EF has been high-stalled, but that didn't really affect the things I've mentioned above.

Thanks.

 

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95 EF XR6 wagon, 17" FTRs, DBA, QFM, KYB/Koni, AU block, ported EF head, SS Inductions, Territory intake, MLS gasket, milled, Franklin RH24B cam, Coby headers, no cat, Tickford 2.5", 2800rpm stall, J3 chip

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 Post subject: Re: BTR Automatic Shift Differences
Posted: Tue Apr 19, 2011 1:20 pm 
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Hey,

I recently had the gearbox in my AU fairlane die, and the only other box i could find (was assured it was an AU, but i know it was an EF because of dipstick) was fitted.

I have noticed that the new box is soooooo much smoother changing gears. But if i am giving it the beans in second it SLAMS into 3rd. I dont know if its cause it is slightly older or not, but there was a noticable difference.

 

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 Post subject: Re: BTR Automatic Shift Differences
Posted: Tue Apr 19, 2011 2:21 pm 
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EF-MattyB wrote:
I recently had the gearbox in my AU fairlane die, and the only other box i could find (was assured it was an AU, but i know it was an EF because of dipstick) was fitted.


Sure it was an EF.

Alot of people added dipsticks to EL and AU boxes... I did.. And many taxi drivers did when their boxes went in for reco.

Its only a 10mm hole in the side of the box.
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 Post subject: Re: BTR Automatic Shift Differences
Posted: Tue Apr 19, 2011 4:44 pm 
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Well to be honest it looks too old to be a AU box. Plus the guy seemed pretty dodgy. Not only that but the auto guys looked at it and said straight away that it looked like it was out of an EF or earlier.

 

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 Post subject: Re: BTR Automatic Shift Differences
Posted: Tue Apr 19, 2011 6:57 pm 
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If the au box is graduly sliding in and takes forever have you bern servicing it lately, they seem to do that if you dont service them at all

 

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 Post subject: Re: BTR Automatic Shift Differences
Posted: Tue Apr 19, 2011 9:01 pm 
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Ride: EF XR6 Wagon, AU2 XR6 VCT

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Can't speak for the history of the trans - just bought the AU off a yard in September. But the car looked generally maintained by the book - lots of near new bits, so the previous owner had spent considerable money on it. The first thing I did was a full trans service and flush anyway. The upshifts at WOT are awesomely fast but not harsh, so I doubt that the clutches are stuffed. Feels more like the way the trans is modulating line pressure. I guess I could control that with a chip, now that the trans table definitions are getting unlocked. I was really just wondering if it's operating normally for an AU - especially the delayed changes (1-4 seconds) when shifting manually at light throttle.

 

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 Post subject: Re: BTR Automatic Shift Differences
Posted: Tue Apr 19, 2011 9:07 pm 
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from what ive heard the au xr series auto boxs are the hardest shifting from factory out of all the btrs made.
i dunno how true or whats different on em but thats what ive heard.

 

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 Post subject: Re: BTR Automatic Shift Differences
Posted: Tue Apr 19, 2011 10:02 pm 
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Is the AU adaptive shift ? that would explain everything... much more computer orientated compared to the earlier models.

 

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 Post subject: Re: BTR Automatic Shift Differences
Posted: Tue Apr 19, 2011 10:09 pm 
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afaik the only au's to have the adaptive shifts were models without the power econo switch..
its mentioned in the factory hand book...
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 Post subject: Re: BTR Automatic Shift Differences
Posted: Tue Apr 19, 2011 10:13 pm 
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yes that's about right. my XR never had the switch, I never found out it was adaptive till a few weeks after I bought it, as much as I hate autos, it was one of fords best controlled 4 speeds.

I also found out you could set the minimum performance value for the auto after I installed the T5.... lol

 

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 Post subject: Re: BTR Automatic Shift Differences
Posted: Tue Apr 19, 2011 10:17 pm 
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Ride: EF XR6 Wagon, AU2 XR6 VCT

Power: 148 rwkw

Location: Auckland
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Yep, it's adaptive shift. Sorry, I called it ESS, which is probably a technical term for it. So, I guess it means the computer does a lot more thinking than normal - thus, the delay.

 

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 Post subject: Re: BTR Automatic Shift Differences
Posted: Wed Apr 20, 2011 12:24 am 
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Not so much thinking causing a delay, more of its watching how you drive and shifting depending on your style.

So if your in say stop start traffic on light throttle, its going to shift and behave like a little girly. You need to teach it to be a man.

I really hate that adaptive shift crap. Hate not knowing what mind the box is in. And it only gets worse as the cars get newer. I miss simple a power and econ button.
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 Post subject: Re: BTR Automatic Shift Differences
Posted: Wed Apr 20, 2011 12:42 am 
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I have an au v8 auto with econo and pwr button, recently fitted an adjustable shift kit, makes a hell of a difference when upshifting and downshifting, much much more responsive.

 

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 Post subject: Re: BTR Automatic Shift Differences
Posted: Wed Apr 20, 2011 6:11 pm 
Getting Side Ways
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Ride: EF XR6 Wagon, AU2 XR6 VCT

Power: 148 rwkw

Location: Auckland
New Zealand

Tragically, most of my driving (in time, not distance) is in stop and go rush hour traffic. So, the computer must think I drive like a nanna, and shift accordingly. I will have to drive the EF to work and keep the AU for weekends, so I can train it with some WOT and redline :twisted:

There is a way you can force it permanently into power mode, so I might give that a try. Cheers for the help, guys.

 

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95 EF XR6 wagon, 17" FTRs, DBA, QFM, KYB/Koni, AU block, ported EF head, SS Inductions, Territory intake, MLS gasket, milled, Franklin RH24B cam, Coby headers, no cat, Tickford 2.5", 2800rpm stall, J3 chip

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 Post subject: Re: BTR Automatic Shift Differences
Posted: Wed Apr 20, 2011 6:34 pm 
Fordmods Junkie
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Its not so much long term training, its more there and then.

The ZF's in a BF learn long term, so they vary their behavior over time. Plus they have a kick down switch on the accelerator pedal so they go from nana to full performance when you need it.

Whereas those boxes only have fixed 5 strategies built in.

So you might spend 90% of your time in traffic, but you need to move quickly. So you do a WOT, but chances are the box will shift well short of redline and shift slowly. Then you go back to traffic driving and it still thinks your driving like a granny. So it doesnt actually give you what you want.

But get out on a windy road and hit WOT say 5 times, then the box says "hey, he wants to drive fast, time to change strategy to semi performance"... Then you hit WOT another 5 times, so the box moves into full performance strategy. Then it stays there until you start slacking off.

So it might be worth forcing it into a mode and see how that tickles your nuts. :lol:
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