turn on 4wd high
Just a question when I'm towing on mountains roads uphill I slow down of course gas engine, just wondering when I drop to around 40 or less would it help to turn on the 4 wheel drive in high mode to h...
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brulaz wrote:Grit dog wrote:
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Oh and you can drive most all newer part time 4x4 trucks in 4 high on dry pavement without the driveline binding up. Turning sharp is obviously difficult though. Still not reccomended.
You and 4x4Ord are saying this, but I drove my 2009 Tacoma about 25km in 4x4 on a paved, secondary road 80km/hr. And the front transfer case (I think) was cooking good and smelly at the end of it. It wasn't a high speed road, but 80km/hr is the speed limit with no reductions for curves that I recall.
The road was white, but it was only a dusting of snow that fell around the crushed rock in the asphalt. So not slippery at all, as I discovered afterwards.
Try driving that Tacoma on dry pavement at 50 mph in 2 wheel drive. Measure your fuel economy over a few miles. Shift into 4 hi and measure your fuel economy. If do this several times and consistently measure an increase in fuel consumption then you you can figure there is a measurable power loss. So I doubt that you will measure more than a 3% increase in fuel consumption which equates to 3% power being wasted throughout the driveline and tire to road surfaces. So say your using 65 HP at 50 mph in 2wheel drive....so 3% more is 67 hp in 4 wheel drive. That extra 2 hp is divided up among a transmission, two differentials, a transfer case and four tires. It is going to make a negligible difference to the temperature that your transfer case oil is running at....dry pavement vs slippery.
