Funker

1999 24 valve, 150,000km, auto tran.. stock. No performance parts
I pull 24' Jyaco 5th wheel with double slide about 4 times a year.
tanks in camper are all empty on way their and way home..
Same terrain their and back


Bin noticing changes in pulling everytime I hook up. This past Friday I hooked up got on highway hit 4th gear, going a 100kmph and cruised for an hour without any loss of power...
Hooked up Monday got on highway hit 4th gear and had trouble staying at 100kmph. weather was raining on Monday and didn't seem like their was much wind. On Friday it was sunny and no wind...
Just wondering if any experienced this problem or is their something wrong with my truck




any ides

Fiftygrit

You might have picked up some crap fuel, check fuel filter, I tow a 36 ft 5th wheel, and even a little wind will change things, my truck likes cooler weather when towing, check air filter, let it breath, I clean air filter and change the fuel filter every oil change, a little over board I know, but cheap to do.

j_martin

Drag (wind resistance) is dependent on air density, and speed. The speed value is a squared function in the calculation.

Heavy wet air as opposed to dry air will increase your drag. Without knowing the temp and atmospheric air pressure, it's impossible to calculate the precise amount, but it is significant. (likely in the 10% - 15% range)

At 100 kph, a 3 kph headwind will increase your drag by 7%.

Most of your power loss on the flat pulling a fiver is drag. I'm willing to bet your truck is running fine.