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What controls the auto gear changes ? 

 

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 Post subject: What controls the auto gear changes ?
Posted: Wed Feb 29, 2012 6:11 pm 
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Hi, question , do the rpm's or kph govern the gear changes in the au autos. I have fitted a set of afr heads car runs great but where as beforehand the gears changed at 5200 rpm's now changes around 4700.

 

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 Post subject: Re: What controls the auto gear changes ?
Posted: Wed Feb 29, 2012 7:27 pm 
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Engine RPM, TPS, Shaft speed, engine load, a/c status, engine temp, trans temp.

 

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 Post subject: Re: What controls the auto gear changes ?
Posted: Wed Feb 29, 2012 9:05 pm 
Stock as a Rock
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Any ideas why the change in max rpm gear shift taking into consideration of various operating conditions all similar to pre fitting of the afr heads.

 

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 Post subject: Re: What controls the auto gear changes ?
Posted: Fri Mar 02, 2012 12:59 am 
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The performance mode shift schedule alone suggests TP vs Driveshaft speed is a determining factor of what speed it will shift at.
With the increased performance you'll be accelerating to the same shaft speed earlier and most likely with less TP % to do it so the shift rpm wil be less.
Did that make sense?
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 Post subject: Re: What controls the auto gear changes ?
Posted: Fri Mar 02, 2012 1:19 pm 
Stock as a Rock
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Yes I know what you are getting at, also had a tps fault code come up , will replace it and see if it is the problem, thanks

 

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 Post subject: Re: What controls the auto gear changes ?
Posted: Fri Mar 02, 2012 1:48 pm 
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Ok the TPS could have a large effect in that case. Of course there other factors involved. In the end it's basically a Load vs speed calculation.
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 Post subject: Re: What controls the auto gear changes ?
Posted: Thu Mar 08, 2012 1:21 pm 
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Replaced TPS still same result so that rules a faulty TPS out. Can the shift points be changed in a custom tune?

 

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 Post subject: Re: What controls the auto gear changes ?
Posted: Thu Mar 08, 2012 2:33 pm 
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Yep.
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