Aidan, from your comments about hopeless drivers and speeding up/slowing down on 60mph limit roads causing lock up/lock down, I assume you are also from UK??
My D24TIC with ZF is exactly the same - locks up/down at 57mph exactly! Frustrating for 2 reasons:
- On light throttle driving (60mph roads just following others) it would be nice if it was locked or fuel economy, but no one actually does 60 - so it's always lock up/lock down/lock up/etc...
- When driving it hard in fourth you can be at the right revs for good boost so accelerating quite well, then at eactly 57mph it locks up, boost falls off because of lower revs, and the acceleration becomes embarassing... and if you're really unlucky the person you're overtaking on dual carriageway finds their power and pulls back past you.
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