A4 shift points / J1850 bus
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Joined: Sep 2000
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From: Erial NJ
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A4 shift points / J1850 bus
Hi,
While on a road course a few months back, I realized that the transmission shift alogorithm for the A4 is not great for the track. I found that the best results were when I left the transmission in '2'.
What suggestions do you guys have for improving the shifting for the track, but without affecting the shifting on the street. I would consider an impoved shift algorithm one where the transmission will always keep the engine in the power band. One where a momentary lift of the throttle at 5000 RPM in 2nd doesn't cause a shift to 3rd and then immediately back to 2nd, but rather leaves it in 2nd during the momentary lift.
I would like to be able to easliy switch between 'street' and 'track' modes. Is there any way to command which gear the transmission is in using the J1850 (diagnostic) bus? If so, I could probably set up a 'paddle' type shift system where I manually select which gear the transmission is in.
That brings me to my next question: Which devices are available for communicating over the J1850 bus? I am aware of the Motorola microcontrollers with the built in J1850 tranceivers. I am considering using the 68HC912B32. But, are there other components for connecting to the J1850 bus that will let me use some of the HC11's I have lying around?
Thanks
While on a road course a few months back, I realized that the transmission shift alogorithm for the A4 is not great for the track. I found that the best results were when I left the transmission in '2'.
What suggestions do you guys have for improving the shifting for the track, but without affecting the shifting on the street. I would consider an impoved shift algorithm one where the transmission will always keep the engine in the power band. One where a momentary lift of the throttle at 5000 RPM in 2nd doesn't cause a shift to 3rd and then immediately back to 2nd, but rather leaves it in 2nd during the momentary lift.
I would like to be able to easliy switch between 'street' and 'track' modes. Is there any way to command which gear the transmission is in using the J1850 (diagnostic) bus? If so, I could probably set up a 'paddle' type shift system where I manually select which gear the transmission is in.
That brings me to my next question: Which devices are available for communicating over the J1850 bus? I am aware of the Motorola microcontrollers with the built in J1850 tranceivers. I am considering using the 68HC912B32. But, are there other components for connecting to the J1850 bus that will let me use some of the HC11's I have lying around?
Thanks
