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08-31-2014, 04:47 PM
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CC Member
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Join Date: Oct 2003
Posts: 4,078
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Not Ranked
Dan---
Leave the 'real, original' Smiths speedo for the DB's in the parking lot to ooh and ahhh over. Drive by the tach.
Do the formula for MPH inputting your rear gear, 1:1 trans (4th) and tire diameter. Do it for each 1000RPM. Then just look at the tach when you're in the school zone for your sedate MPH.
Also do it for near redline.
For instance, 6200 in 4th with my combination was 155MPH. Which I enjoyed whenever space allowed............
__________________
Chas.
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08-31-2014, 05:09 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Chas. is right. Because of this thread, I looked at my speedo this weekend for the first time in a long time (the Smiths speedo is in the middle of the dash). At 45MPH it was not holding perfectly steady, but was "wiggling" up and down about a half inch or so. I hardly ever look at it -- I've used the "tach" method forever. 7, 11, 17, 21, and 34 -- just do the quick math in your head. Cops tend to cut me more breaks in the Cobra than they do in my DD cars anyway.  |
08-31-2014, 05:41 PM
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CC Member
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Join Date: Oct 2003
Posts: 4,078
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Not Ranked
Quote:
Originally Posted by patrickt
Chas. is right.
Cops tend to cut me more breaks in the Cobra than they do in my DD cars anyway. |
I will cherish that first sentence forever......
Police are feeling great pity that someone forced you to ride in a foam- insulated and beige example of what was by legend, a raw-boned sports racer... 
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Chas.
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09-01-2014, 07:54 AM
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CC Member
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Join Date: Dec 2006
Location: Southbury,
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Cobra Make, Engine: ERA, 428, 4 speed Toploader, Jag rear, Red with White stripes
Posts: 954
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Not Ranked
Quote:
Originally Posted by patrickt
Chas. is right. Because of this thread, I looked at my speedo this weekend for the first time in a long time (the Smiths speedo is in the middle of the dash). At 45MPH it was not holding perfectly steady, but was "wiggling" up and down about a half inch or so. I hardly ever look at it -- I've used the "tach" method forever. 7, 11, 17, 21, and 34 -- just do the quick math in your head. Cops tend to cut me more breaks in the Cobra than they do in my DD cars anyway. |
Your wiggle issue sounds like the inside of the reverser is a little gummed up. Easily taken apart and lubed
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ERA#698 428, 4 speed Toploader, 3:31 Jag rear
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09-01-2014, 08:14 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Quote:
Originally Posted by davids2toys
Your wiggle issue sounds like the inside of the reverser is a little gummed up. Easily taken apart and lubed
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Naaah, I look at that dang speedo less than a minute a year in total. The next time I go under the dash, which is a PITA even on a good day, will be to wire this in to the four signal lights for emergency flashers. I plan to mount it in the glove box just like the 65/66 Mustang had it. I need to pick up some Schottky diodes and a flasher unit first though. I think I'll just Posi-Tap in to the lines for the front signals and dashboard light. The rear lights are easy to tap off of from the fast-blow fuse block on the steering column. I think even ol' Chas will like this:
Last edited by patrickt; 10-28-2016 at 08:51 AM..
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09-01-2014, 08:23 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Like this...
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09-02-2014, 04:25 PM
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CC Member
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Join Date: Dec 2006
Location: Southbury,
ct
Cobra Make, Engine: ERA, 428, 4 speed Toploader, Jag rear, Red with White stripes
Posts: 954
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Not Ranked
Quote:
Originally Posted by patrickt
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This would be awesome. i would definitely be interested in doing this job!!!
My Unique Cobra had flasher switch chunder the dash on the same panel as the heater controls.
Please post when and if you do it...maybe we could make it a group project, LOL
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ERA#698 428, 4 speed Toploader, 3:31 Jag rear
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09-02-2014, 05:29 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Quote:
Originally Posted by davids2toys
This would be awesome. i would definitely be interested in doing this job!!!
My Unique Cobra had flasher switch chunder the dash on the same panel as the heater controls.
Please post when and if you do it...maybe we could make it a group project, LOL
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I have the switch -- you can get them for about $30, and I just ordered the diodes off of Amazon for next to nothing (see link below). The Posi-Taps you can pick up at Pep-Boys, and the wiring taps are so simple even Chas could do it (if you could pull him away from Joan Rivers' bedside, that is...). Of course I'll post a detailed thread on it when I do it. This little job has an all-in cost of under $50.
[ame="http://www.amazon.com/Axial-Leaded-Rectifier-Schottky-Diodes/dp/B00KHTRBGU"]Amazon.com: 20 Pcs Axial Leaded SR540 Rectifier Schottky Diodes 5A 40V: Industrial & Scientific@@AMEPARAM@@http://ecx.images-amazon.com/images/I/51TOkuE7BDL.@@AMEPARAM@@51TOkuE7BDL[/ame] |
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