Cruising speed
Submitted: Monday, May 21, 2007 at 01:30
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Lawrence
What would be a good cruising speed for a TD42?
Mine is a 4 speed manual (yes they exist in the earlier gqs here) and i was wondering what would be a good cruising speed for it? i had a 5 speed in my old mk ute (which had a much higher axle ratio) and 4 speed seemed ok for most conditions and it cruised ok at 55mph to 60 in 5th speed (although a little more taxed after the change from 32s to 31s)
Reply By: Sea-Dog - Wednesday, May 23, 2007 at 12:09
Wednesday, May 23, 2007 at 12:09
I have found that most manufacturers aim the drivability to be best at around 80kph.. (50mph for
Lawrence :) ) i.e. motor not working too hard and getting good economy.
Each car is different though and there is nothing to say that your diff gear ratios haven't been played with etc.. even your tyre size will play a big role in the cruise speed of your car.
I would say it would come down to what you are comfortable driving at.. if the economy is best at 80kph but you never drive at less than 100kph (63mph) then there is no point is saying that 80 is the best cruise speed as you wil not drive there anyway..
listen to the revs and you can generally tell when the motor is working too hard.. the best cruise speed is a combination of when the motor is humming along nicely, the diff whine is bearable, the tyre noise is not drowning out the stereo, and the car handles
well enough to be considered safe.... if all these factors are ok and the fuel economy is good then I would say THAT is your best cruise speed!
I reckon is sounds pretty good where you are
Lawrence!!!! Geez 160mile from end to end though... that is not even a morning drive for us! sounds like you have some great off roading around you though..
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