Speedo Adjustment
#1
Speedo Adjustment
Now that I have 30x950x15 BFG ATs on my truck
where I USED to have 225/70/15
with the old tires, it could always run down the hiway at 72MPH
now the best it would do is about 68MPH
It's only a 4 wz a 5 spd, so it seems with the bigger tires I lost some speed, power and MPG
How can I tell what the real speed is on the sppedo since the change??
where I USED to have 225/70/15
with the old tires, it could always run down the hiway at 72MPH
now the best it would do is about 68MPH
It's only a 4 wz a 5 spd, so it seems with the bigger tires I lost some speed, power and MPG
How can I tell what the real speed is on the sppedo since the change??
#2
Convert Metric Tire Sizes to Inches:
http://therangerstation.com/tech_lib...nch_Tires.html
225/27R15 = 27.4 inches diameter
Checking your Speedometer After Changing Tire Sizes:
http://therangerstation.com/tech_lib...rom_Tires.html
Original Tire Diameter: 27.4 inches
New Tire Diameter: 30 inches
At 100mph actual speed is 109.5mph
109.5 / 100 = 1.095
Multiply whatever speed you are traveling by 1.095:
60mph * 1.095 = 65.7mph
Additionally for calculating gas mileage:
1. Fill tank completely
2. Reset Tripmeter
3. Drive until tank is close to empty
4. Fill tank at same pump
5. Take mileage on tripometer and multiply by 1.095
(ex: 200 miles * 1.095 = 219 miles actual distance traveled)
6. Take amount of gasoling required to fill your truck and divide actual distance traveled by amount of gasoline
(ex: 219 miles / 12 gallons = 18.25 mpg)
Taa Daa!
http://therangerstation.com/tech_lib...nch_Tires.html
225/27R15 = 27.4 inches diameter
Checking your Speedometer After Changing Tire Sizes:
http://therangerstation.com/tech_lib...rom_Tires.html
Original Tire Diameter: 27.4 inches
New Tire Diameter: 30 inches
At 100mph actual speed is 109.5mph
109.5 / 100 = 1.095
Multiply whatever speed you are traveling by 1.095:
60mph * 1.095 = 65.7mph
Additionally for calculating gas mileage:
1. Fill tank completely
2. Reset Tripmeter
3. Drive until tank is close to empty
4. Fill tank at same pump
5. Take mileage on tripometer and multiply by 1.095
(ex: 200 miles * 1.095 = 219 miles actual distance traveled)
6. Take amount of gasoling required to fill your truck and divide actual distance traveled by amount of gasoline
(ex: 219 miles / 12 gallons = 18.25 mpg)
Taa Daa!
#6
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Superchips programmer. It reprograms your computer to advance timing to accomidate for a higher octane fuel, which generates more power. It also can read diagnostic codes, firm shifting in auto transmissions, reprogram your speedometer for different tire sizes and or gear ratios, etc. Search google for "Bamachips" for more information.
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