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12-01-2014, 01:55 PM | #1 |
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Join Date: Jul 2012
Location: middletown, delaware
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speed and odometer readings
my 48 has 15 in. wheels. did the speedo and odometer readings change much? I got the coupe this way. I assume it has the original gear. Thanks.
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12-01-2014, 02:31 PM | #2 |
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Location: East Shore of LAKE HOUSTON
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Re: speed and odometer readings
Really has more to do with OUTER DIAMETER of tire than wheel diameter. DD
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12-01-2014, 03:02 PM | #3 |
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Location: Near Rising Sun, Maryland
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Re: speed and odometer readings
Are you talking about the ring and pinion gear or the turtle gear being original? What is the number on the turtle housing. What are the numbers on the bottom center web of the banjo housing?
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John "Never give up on what you really want to do. The person with big dreams is more powerful than one with all the facts". Albert Einstein |
12-01-2014, 03:57 PM | #4 |
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Location: Solihull, England.
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Re: speed and odometer readings
If you can state the exact size of the rear tyres as stated on the sidewall, It is possible to calculate the % difference between stock 6.00:16s and what you have.
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12-01-2014, 04:04 PM | #5 |
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Re: speed and odometer readings
I installed 3;54 gears in my Model A, I bought a turtle gear to match, installed the gear in the 3:78 turtle. SO, if someone looks at my turtle or reads the no. on the banjo there going to think it's 3:78 but accually my A has 3:54 gears. Walt
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12-01-2014, 04:50 PM | #6 |
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Re: speed and odometer readings
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I run 650x16 for better speed. |
12-01-2014, 06:59 PM | #7 |
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Location: Iowa
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Re: speed and odometer readings
Most old speedometers are not very accurate. Most are at least 5-10 percent off. The instrument may be in need of cleaning and lube, or the magnetic discs and spring may be weak. If the needle is jumpy, the input fitting may be worn and loose in the body. My NOS speedo with new cable and sheath is still about five mph off.
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12-01-2014, 08:24 PM | #8 |
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Re: speed and odometer readings
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12-01-2014, 09:35 PM | #9 |
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Re: speed and odometer readings
I have an app on my iphone. It tells speed and distance.....and when to pick up milk and eggs.....MARK
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12-01-2014, 09:42 PM | #10 |
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Re: speed and odometer readings
use a gps thet are very accurate.
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12-01-2014, 11:44 PM | #11 |
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Re: speed and odometer readings
I swapped a 9" with 3.50 gears into my truck, and am running 235/75-15's, so my speedo/odo ratio is off almost exactly 10%. On a long interstate trip I kept track of the odo readings against the mile markers, and the odo was indeed off 10%. But the speedo is off 10% up to about 50 mph (actual), by the time I get to 55 or 60 it is off 15%. The speedo is an NOS replacement with only 5k miles on it, new cable, etc. You're right, they just aren't designed to be real accurate. I use the tach if I'm worried about going a specific speed.
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