North American Turbocoupe Organization



Custom 140mph speedo?
Chuck W Offline
Posting Freak
#1
Hey- I have a question about something that occurred to me as I was driving to SC last weekend and I was looking at my 85 mph speedo in the XR7 (84) and was thinking that I should be possible to have a new overlay made for the speedo (which might even match the factory background) and then have a speedo shop recalibrate it to the 140 max instead of 85. This should be able to be accomplished right? I know there was one available for the 85+ cars but nothing for the earlier ones (83-84). I know the XR7 has alot more in it than the speedo tells, and I know the Pseudo-Coupe will have even more....
It was just one of those thoughts you get while driving alone for hours on end.

Chuck

------------------
The Cat in the birdcage...
83 TC Clone, 80 Cougar XR-7, 85 Volvo 244 Turbo, AND 88 Scorpio
Reply

Dan E Offline
Posting Freak
#2
I wonder what effect changing the speedo cable drive gear ratio (in the T5) would do ?

I also wondered about taking a Mustang speedo and swapping out the guts ???

I wish there was a cheap alternative somebody could come up with !

Man Chuck...you went to SC and didn't stop by to see me on the way through !
Dan Eaves
88TC 5spd Vermillion Red, Polished...everything...
Reply

Walsted Offline
Posting Freak
#3
Quote:Originally posted by Dan E:
I wonder what effect changing the speedo cable drive gear ratio (in the T5) would do ?

Since the 6 tooth is already the lowest, the 17 tooth would need to be changed to the 28 tooth. (140/85=1.647, 17*1.647=28). That is assuming most TCs come with the 6/17 combo, and the tires are close to the stock diameter. A 23 tooth gear could get the speedo to 115, and the 21 tooth to 105.

------------------
Mike Walsted
1986 5-speed TurboCoupe .

[This message has been edited by Walsted (edited 07-24-2001).]
Mike Walsted - Sold my 1986 5-speed TurboCoupe
Reply

Walsted Offline
Posting Freak
#4
Oops, bad math. My speedo has graduations to 95, so the math works out that a 25 tooth gear would be needed for an overlay to show 140. A 23 tooth gear would get the speedo to about 130, though.

------------------
Mike Walsted
1986 5-speed TurboCoupe .
Mike Walsted - Sold my 1986 5-speed TurboCoupe
Reply

Chuck W Offline
Posting Freak
#5
Well I think instead of replacing the gear just have the speedo itself recalibrated and leave the other gears alone aside from fine-tuning.
Dan- Well I was really only in NC for about an hour or so (Ashville area) on my way through. I will be back up there this weekend for a whitewater rafting trip. Where 'bout's in NC do you live? My favorite part of the trip is that section on I-40 labeled "Winding road next 16 miles"....It's like "get to the right and get out of my way! The Cat is comin' through!

As for the speedo, when I get home, I have a spare inst clutster that I can mess w/ and see what I can do...
Chuck



------------------
The Cat in the birdcage...
83 TC Clone, 80 Cougar XR-7, 85 Volvo 244 Turbo, AND 88 Scorpio
Reply

DennySweet Offline
Member
#6
Chuck Are you going down the Nanahala River? Some kick ass rafting there. Dan lives in the center part of the state, south of Raleigh I think. That right Dan! Chuck are you gonna have a speedo shop do the 140mph change? Like to hear how that works. I use to live in Hendersonville which is south of Trashville Opps! Asheville. for 11 years. Nice area. Where in SC do you go?

------------------
88TC,87TC,88Mustang,86S-10,82Toyota,2-88S-10Blazers,56 Merc
88TC,87TC,,86S-10,82Toyota 4WD,3-88S-10Blazers.
Reply

Dan E Offline
Posting Freak
#7
I live in Greensboro, NC 1.5hrs West of Raleigh/Durham and 20 minute East of Winston/Salem. 1 Hour south of the VA border. I-40 runs right by my house. It would be about 3 hours East of Ashville.
Dan Eaves
88TC 5spd Vermillion Red, Polished...everything...
Reply

Chuck W Offline
Posting Freak
#8
Denny- I'm not sure where we're going. I'm just along for the ride w/ the rest of the family. I'm not sure about the speedo yet, I think I need to psych out the faceplate first and then see of they can redo it.
Dan- Well, if I was on my own I would possibly swing that way, but I think there are going to be about 4-6 cars in our group.
Chuck

------------------
The Cat in the birdcage...
83 TC Clone, 80 Cougar XR-7, 85 Volvo 244 Turbo, AND 88 Scorpio
Reply





Users browsing this thread:
1 Guest(s)



Theme © iAndrew 2018 - Software MyBB