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      05-06-2019, 04:10 PM   #2145
rjahl
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Drives: Z4 35is
Join Date: Jun 2011
Location: Tampa

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2012 Z4 35is  [0.00]
Quote:
Originally Posted by Joester View Post
Quote:
Originally Posted by hassmaschine View Post
Ahh, yes in fact I bet it is your diff swap that's pissing it off. Since the current gear is calculated by using RPM and VSS.

It's possible to adjust the gear ratio in the tune of course to match your cruise control.
But then why would it not even work in 6th gear this morning? I'm fine with it not working in 5th gear. The only time I use cruise is in 6th gear anyways, but I'm still confused about the inconsistent behavior ive observed lol.
Does the cruise control even try to work in 5th gear? If coasting along at 50 MPH in fifth and you hit the stalk does it fail or will it try to hold a speed for a few seconds and then fail?

Try a few things like setting the cruise a speed above your current speed and below. Use resume.

Maybe it's an expected torque calculation within the cruise control subroutines. The DME is expecting certain load,speed conditions and the values are falling outside an expected range. Just think about the math involved to keep your car at a constant speed.
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