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03-29-2005, 10:48 AM
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Senior Club Cobra Member
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Join Date: Mar 2005
Location: Manchester,
NH
Cobra Make, Engine: AK1085 (302), HTM111 (427 Comp), CSX2375R (289 Comp) and Scratch 427 S/C
Posts: 18,750
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Not Ranked
Speedo
Help?
Any ideas how I can make my speedometer more accurate. At 70 my speedo measures high by ~20mph. Smiths 180mph gauge with TopLoader.
Thanks
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03-29-2005, 12:04 PM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
Your speedometer is actually a voltmeter. It simply reads the voltage generated from the small generator inside it that the cable is driving. There is a calibration screw on the back (it might be touched with a dob of paint). You have the right idea already, if you can get an accurate difference at highway speed, lets say your number was 90 and supposed to read 70. You can remove the speedo and put it on a drive like a variable speed drill and bring it up to 90. You can use a universal speedo cable or the one from the car to drive it. Now turn the adjustment calibration screw on the back to make it read 70 and you will be pretty close. The other more expensive option is to have it calibrated on a machine like a dyno or rolling road machine that effectively does the same thing only by spinning the wheels through the drivetrain to get the speed and giving the same screw a tweak.
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03-29-2005, 12:13 PM
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CC Member
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Join Date: May 2000
Location: Northern VA,
VA
Cobra Make, Engine: Classic Roadsters
Posts: 2,765
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Not Ranked
You gotta be kidding!!!!?????
"It simply reads the voltage generated from the small generator inside it that the cable is driving."
A small generator inside the speedometer?????? Wha?????
My fuel gauge measures total fuel weight, and density relative to the barometric pressure for the day. It then factors in the coreolas effect as the fuel empties down the fuel line and calculates the remaining fuel in the tank which it posts to my old analog gauge.
Sorry, I had to do it!
Ed
__________________
LIFE IS TOO SHORT TO WORRY ABOUT GOOD GAS MILEAGE
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Utinam logica falsa tuam philosophiam totam suffodiant!
________
Last edited by CobraEd; 03-29-2005 at 12:21 PM..
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03-29-2005, 12:27 PM
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CC Member
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Join Date: Nov 2003
Location: New Britain,
CT
Cobra Make, Engine: Size 10 Feet
Posts: 2,993
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Not Ranked
Re: Speedo
Quote:
Originally posted by 1985 CCX
Help?
Any ideas how I can make my speedometer more accurate. At 70 my speedo measures high by ~20mph. Smiths 180mph gauge with TopLoader.
Thanks
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CCX? Is that a Contemporary? If so, you'll have to change the speedometer driven gear at the transmission end of the cable.
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03-29-2005, 12:50 PM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
Now there's an easy fix! Thanks Bob, and you know CCX is Contemporary. Nice looking car BTW.
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03-29-2005, 02:05 PM
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Senior Club Cobra Member
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Join Date: Mar 2005
Location: Manchester,
NH
Cobra Make, Engine: AK1085 (302), HTM111 (427 Comp), CSX2375R (289 Comp) and Scratch 427 S/C
Posts: 18,750
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Not Ranked
Thanks
Yes CCX does indicate Contemporary Classic. Thanks for the compliment mickmate! Any ideas where to get a gear replacement and procedure for determining the correct gear if there is no adjustment screw?
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03-29-2005, 04:14 PM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
David Kee is the toploader man on this site, his link is on the left of the page and he can advise on correct gear also I bet.
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03-30-2005, 09:17 AM
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Senior Club Cobra Member
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Join Date: Mar 2005
Location: Manchester,
NH
Cobra Make, Engine: AK1085 (302), HTM111 (427 Comp), CSX2375R (289 Comp) and Scratch 427 S/C
Posts: 18,750
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Not Ranked
Mickmate,
Looked last night and there is a screw on the backside lower portion of the speedo. It actually sets out ~1/8th" and has a green washer between it and the speedo housing. Would you agree that this may be an adjustment point? How much of a turn would it take, have you done this? Want to make sure I do not destroy the unit.
Thanks
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03-30-2005, 10:04 AM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
Yes I have done this and it worked quite well. Did you look into different gears? I'm guessing that would be a simple proportioning problem. 70/90 = .777. A 14 tooth gear X .777 = 10.88 so you'd use an 11 tooth gear if you could get one. Try turning the screw but make a note of where it started, both on screw position and needle reading. There are a few good articles from a google search on speedometer calibration and adjustments depending on the principle. Some of us aren't afraid of finding out how things work and tinkering with them a little, go for it (in a methodical way of course). Let us know how it works out.
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