Quick Autobox Question

Datatek said:

Torque convertor lock up occurs at around 50mph in top gear on all models. Lock up in third occurs at around 40mph. I often hold the box in third to take advantage of the lower lock up speed

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quavey said:

On a gems and diesel it is around 50 mph I will agree, on the later thors it will do it around 35mph. The revisions to the intake manifold mean there is so much more torque at the bottom end its far happier to do it. Having driven a gems which wont lock up till 45/50 ish but the two thors I and a friend have both will happily lockup around 35mph in D and if your careful stay in it until 31mph or so much more pleasing to bimble around in that using the torque of the mighty RV8 rather than it revving its knackers of.

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Saint.V8 said:

You can manually select 1,2 or 3 and the box will make the appropriate downshifts at the most appropriate road speed... i.e. if you select 1 on the motorway, the box will NOT change down to first until such time as the vehicle speed is reduced to a point where 1st gear is safe to select...

if you are in D, you can select 3 and the box will downshift (if it is safe to do so) and then hold 3 until you select D again....basically this manual selection limits upshifts...so if you select 3, it limits shifts to 1,2 & 3 only....

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TCubed said:

Would it stop park or reverse engaging at speed too?

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Datatek said:

Park is purely mechanical so the ECU cannot stop that, it should stop reverse as although the reverse clutch is mechanically selected, the next stage is electronic. It would be a foolish thing to try though, one bad connection and it's fecked.

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TCubed said:

Park would presumably just snap with that amount of force on it. If the torque converter wasn't locked when R was selected (assuming the ECU let it) would it be able to absorb enough to avoid ruining the box, or at least the gear?

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