Monday, Sep 23, 2013 at 20:51
I don't think to many of those supporting autos have roll started there cars recently.
I find the whole subject of differences between cars quite interesting and very hard to get to the real advantages and disadvantages of different setups.
This is mostly I believe because people often don't compare the same things with only the one variable like transmission for example, usually they compare something they once owned with something they now own and often its even a different make or model.
We have some 4.8 lt GU Patrols in manual & auto and the differences are real and one isn't necessarily better or worse - its more a matter of matching the vehicle to your requirements.
We have driven ours in all conditions.
In comparing the above GU patrols its obvious that the manual is easier to live with it the bush, its just simpler , less electronics , can be roll started , doesn't use as much
battery power if you have an alternator failure and need to drive on the battery alone.
You can even drive the car for 50m + just on the starter motor if you have a fault that prevents the engine starting (like faulty ignition key).
In short mechanically its easier to maintain and fix these Patrols in manual.
Water crossings -
well a breather hose broke once an water went into gearbox - but it can be drained and filled on side of the road - try that in the auto !
Really deep water crossings - pity they mounted the autos trasmission computer in the engine bay !
Fuel Consumption for my driving pattern is about the same - the auto uses a lot more in say a Simpson crossing , but uses less cruising on the long journeys to the outback so this variable is basically neutral.
Power to the ground -
well manuals are 5-10% more efficent by design but this is only good if you can realise this.
I.E. The auto and its inefficent torque converter but faster gear changes will get the auto Patrol to 100kmh in about 1 second less than the manual , however if towing a van and you need to overtake from say 80-110kmh then it the manual you select the right gear and you will overtake in almost 2 seconds less time.
Slow going like crossing a dessert -
well in the manual you can idle along at 20 kmh forever whereas in the auto it will be swapping gears all the time and uses a lot more fuel.
Getting up big sand dunes - an interesting one , conventional wisdom puts the auto in front but my experience has not been this and I'd call it equal.
While recently we put our auto up Big Red a few times and it performed brillantly we also had the embrassing incident of twice bogging down on smaller dunes - keeping this short, essentially what happens on marginal hills is that the auto can change down really fast and deliver the torque but unfortunately this sudden torque tranfer can break traction and cause the car to dig in and a driver has little control.
In the manual ,
well you have to pick just the right gear as changing it can stop you just as quickly.
Downhills - a traditional winner for manuals - but we had our autos valve body upgraded and drive ratios changed and
well these is no real difference.
Caught Out -
Well this is a winner for the auto so what do I mean. An example is
when say someone tries to cut you off or your half asleep and need to react fast
well the manual requires a gear change , but auto will deliver the power faster and is unlikely to stall in an emergency.
Towing -
Well apart from speed advantages above for the manual the auto does get a heavy load moving more easily but at the price of a lot more transmission heat.
In the cars I'm referring to above they both have a large amount of low down torque
and so getting off the line isn't an issue with either transmission.
So I don't pick a winner - rather just outline some real on the ground differences.
My wife would however pick the auto every time and doesn't car how much more I have to pay for the around town increased fuel use.
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