RPM vs MPH
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Freshman User
Joined: Dec 2004
Posts: 31
Likes: 0
From: Georgetown, TX
RPM vs MPH
I have a 2002 Ford F650 SuperCrewzer with the Cat 3126B and 6 speed auto, at 1800 RPM it travels at 60 MPH. I think these engines should not be run over 1800 RPM and when I do the MPG goes down. I would like to get more SPEED (don't we all) with out loosing MPG, would it be wise to change the rearend gears? or does someone know what would be a good solution.
Thanks
Thanks
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
Larger diameter rear tires will give you more speed without more RPM, but your speedo will be off. A GPS can show you the exact speed your traveling, and you can make a cheat-sheet and tape it to the dash 
Other than that, rear gears are the only other thing that will bring up your speed. Or an overdrive unit.
Other than that, rear gears are the only other thing that will bring up your speed. Or an overdrive unit.
Junior User
Joined: Oct 2005
Posts: 74
Likes: 0
From: Bishop, CA
[quote=Tundra Pony;8930123]I don't think I like the cheat-sheet idea ...... I'll go with the gear change I think.
You do realize the gear change will throw the speedo off too?
Don't sweat the cheat sheet, not likely to get speeding tivkets in it.
You do realize the gear change will throw the speedo off too?
Don't sweat the cheat sheet, not likely to get speeding tivkets in it.
Tuned
Joined: Feb 2006
Posts: 487
Likes: 3
From: Lampasas,TX
I used to have a '98 Ranger that came with 225/75R14 tires and I switched to 235/75R15 tires. I found out that the speedometer was actually "driven" by the computer so I took it to the Ford dealer and he reprogrammed the computer for the larger tires. Easy enough.
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