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While I was driving mine on Sunday, I pulled out from a junction in a lazy, shark that's just eaten, not remotely in a hurry kinda way and accelerate slowly. For some reason the 'box decided to hold 1st until 4500 rpm. Had to knock it into tiptro mode and back again. The box does odd things sometimes, but that's a first for me.

I'm not worried, just wondering if anyone has had same or similar?

Obviously, this was in 'D'. I is not a <beep>.

How had you been driving in the few minutes prior to that? Been giving it some stick? Might have "learnt" you were in a hurry and rethunk its shift pattern, expecting a bit more of a gungho right foot?

Not even, I had just been punting around. Most of the time not going about 30. Prior to that a motorway run. No obvious reason why it would have done that.

Did MTM tweak your box or is it normal chocolate?

Box is standard, MTM breathed on the TCU. But they don't touch the 'D' part of the program, they told me. The only mods they make are to the tiptro bit.

Did you possibly touch one of the tiptro paddles by mistake? Sometimes I decide to down change using a paddle whilst in D and (obviously) it won't change out of gear (entering a temporary tiptro mode), I guess it assumes I've taken over shifting for a bit. It then resumes normal shifting duties after 10 secs or so. I'm very rarely in D mode though...

That's exactly what I thought had happened, but when I looked at the dash, I saw it was still in D. When you touch the switches / paddles in D it switches to tiptro briefly but also changes the dash display.

ISTR reading that the gearbox resists making gear changes if you're going round a bend, ie it factors in the steering wheel position. Perhaps because you were pulling out of a junction, it decided to stay in gear until you straightened? Sounds like it overdid it, if so.

Good Call! I am going to test that if I can find a large carpark to treat as my very own slowmotion skidpan!

Does sound like a GB brain snap. Can't wait until someone comes up with a way to marry the 26A gearbox with our C5s'.

bam_bam wrote:Does sound like a GB brain snap. Can't wait until someone comes up with a way to marry the 26A gearbox with our C5s'.

whats that one bam?

andyt wrote:ISTR reading that the gearbox resists making gear changes if you're going round a bend, ie it factors in the steering wheel position. Perhaps because you were pulling out of a junction, it decided to stay in gear until you straightened? Sounds like it overdid it, if so.

I like the sound of that. I was turning right, but had straightened up.

the 26A is the 6 speed box in the Bentley, I believe. Not sure what other W12 engines use it.

phaeton ?
A8 ?

I thought I also read that the C6 RS uses a modified 26A...