I need help with math
Laughing Gas
Joined: Nov 2001
Posts: 1,062
Likes: 78
From: Edmonton, Alberta
Those signs they put up that show your MPH, in my experience, all read low, so don't take their readouts seriously.
I gave you the formula, all you have to do is plug in the numbers.....
Or, if math is that painful, here is an online calculator, but be forewarned, you still have to plug the numbers in
**for the last numeric value (transmission ratio), enter 1 for direct drive, or the decimal number if in overdrive
https://spicerparts.com/calculators/...rpm-calculator
I gave you the formula, all you have to do is plug in the numbers.....
Or, if math is that painful, here is an online calculator, but be forewarned, you still have to plug the numbers in
**for the last numeric value (transmission ratio), enter 1 for direct drive, or the decimal number if in overdrive
https://spicerparts.com/calculators/...rpm-calculator
Thread Starter
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Fleet Mechanic
Joined: Jun 2019
Posts: 1,899
Likes: 236
From: Southern California
Those signs they put up that show your MPH, in my experience, all read low, so don't take their readouts seriously.
I gave you the formula, all you have to do is plug in the numbers.....
Or, if math is that painful, here is an online calculator, but be forewarned, you still have to plug the numbers in
**for the last numeric value (transmission ratio), enter 1 for direct drive, or the decimal number if in overdrive
https://spicerparts.com/calculators/...rpm-calculator
I gave you the formula, all you have to do is plug in the numbers.....
Or, if math is that painful, here is an online calculator, but be forewarned, you still have to plug the numbers in
**for the last numeric value (transmission ratio), enter 1 for direct drive, or the decimal number if in overdrive
https://spicerparts.com/calculators/...rpm-calculator
BTW, I have confirmed the 80 @ 70 with a couple of GPS speedos. Thanks again!
Cargo Master
Joined: Sep 2005
Posts: 2,954
Likes: 64
Most areas have a measured mile on the high way or a side road that the towns use to calibrate Taxi meters, ask your local weights and measures where it is and check your odometer against the measured mile.
simple math.
simple math.
Cargo Master
Joined: Apr 2003
Posts: 2,389
Likes: 58
Basically what you are wanting to do is compare mpg with a ratio of 1:1 to the overdrive ratio. This is easy. After the trans swap is complete take a trip, only going into 4th gear, calculate mpg then take a trip with overdrive, calculate mpg, and that is your comparison. This eliminates any other variable, providing the most accurate comparison since it will be the exact same drivetrain.
Thread Starter
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Fleet Mechanic
Joined: Jun 2019
Posts: 1,899
Likes: 236
From: Southern California
Basically what you are wanting to do is compare mpg with a ratio of 1:1 to the overdrive ratio. This is easy. After the trans swap is complete take a trip, only going into 4th gear, calculate mpg then take a trip with overdrive, calculate mpg, and that is your comparison. This eliminates any other variable, providing the most accurate comparison since it will be the exact same drivetrain.
Thread Starter
|
Fleet Mechanic
Joined: Jun 2019
Posts: 1,899
Likes: 236
From: Southern California
First tank full with the overdrive is looking like 10.5 MPG. My reciepts from the 4 speed blew out of the window so I'll have to make a run without using the OD.
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gtex
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
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Dec 23, 2004 09:52 PM
