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22nd May 2012, 11:35 #15
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Yes. a diesel produces higher torque (and power) at lower revs than a petrol engine. So as long as you are in the right rev band all is well. A diesel engines "sweet spot" is at lower revs than a petrol engine's.
The trouble is that sensors for the automatic transmission appear to work on revs (it may be on the negative presure in the inlet manifold, but the effect is the same). So, as the revs drop it changes down a gear. And the revs for the changes seemed to be optimised for a petrol engine. The car always felt it was in rthe wrong gear. It didn't matter around town or on a motorway but on twisty country roads it was a disaster.
Road tests I have read seem to say that the only manufacturer to get to grips with the issue and match an auto transmission to a diesel was Citroen a few years ago and they have since discontinued the model. I think, from a faint memory, that the "good" auto diesel was the BX.Duncan Rollo
The more you learn, the more you realise how little you know.
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