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Yes, it means the engine is turning at higher rpms, and more power is available. Not only is more power available, it is multiplied more.Originally Posted by Graymist
Thanks for explaining the concept so well, Allan. Does that mean, therefore, that the higher the gear ratio, the more power that is generated ? Is that why heavy haulers, like the Volvo I drive, have a gear ratio of 4.11, as it means more power ?
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As for the final gear, does a higher number result in a higher RPM at final gear ?
If everything else is the same, yes.As for the final gear, does a higher number result in a higher RPM at final gear ?
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My truck cruises at its final gear ( 18-speed ) at around 1450-1500 rpm, at 100 km/h. Does a high final gear lead to better pulling power on hills when in the final gear ?
Yes, a higher numerical gear contributes to better pulling power in ALL gears if everything else is the same. If two trucks have the same tranny, but different gears, the truck with the higher numerical gear ratio will outpull the other truck while its in the same gear as the other truck. However, the second truck can just downshift, and it will have more multiplication.My truck cruises at its final gear ( 18-speed ) at around 1450-1500 rpm, at 100 km/h. Does a high final gear lead to better pulling power on hills when in the final gear ?
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Also, is it possible to get the gear ratios and final gear lowered to save on fuel, or raised for more power output ?
Yes it is done all the time. Costs several thousand dollars to change the gear ratio in the differentials. Final gear in the transmission can be changed by swapping the transmission. This is probably never done, as it's easier to change the gear ratio in the diffs.Also, is it possible to get the gear ratios and final gear lowered to save on fuel, or raised for more power output ?
Gear ratios generally range from 2.64 to 4.30.
Also, some transmissions have a direct drive(1:1) final gear. Supposedly this is more efficient because it churns less oil in the transmission. Of course, the gear ratio has to be changed as well. 2.64, 2.79, or 2.93's are found in these trucks.
If you want to fiddle around with final ratios, gear ratios, tire height and such, download "cummins powerspec". Very nice piece of software.