What did you do to your TJ today? - Page 5778 - JeepForum.com
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post #86656 of 109692 Old 07-24-2013, 11:10 AM
BamaJeepman21
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Called MC Thursday or Friday to check on the status of my CA's. They said they were finishing up a batch and should have them shipped out soon. I really hope so because I move in 2 weeks and I really need those on for the interstate travel.

I did drive 180 miles down to Tuscaloosa and then another 50, all interstate, before I filled up again. Stopped when I had 1/4 of a tank left. 220 miles on roughly 14 gallons is pretty good. Especially since I was doing 70-75mph with 33's and 3.07's.


Question: If my speedo is off about 5-6mph, what percentage is that so I can figure out exactly how far I traveled?


-Jack
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post #86657 of 109692 Old 07-24-2013, 11:25 AM
SlackJaw
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Quote:
Originally Posted by BamaJeepman21 View Post
Question: If my speedo is off about 5-6mph, what percentage is that so I can figure out exactly how far I traveled?
off 5-6 mph AT WHAT SPEED? Then you can figure percentage.

Your speedo is always going to be off at a constant percent, rather than a constant mph...i.e. if it's off by 5mph at 50mph, then at 70mph it's going to be off by 7mph, but at 30mph it's going to be off by only 3mph. That is why to say it's "5-6 mph off" doesn't tell enough to answer the question your are asking.
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post #86658 of 109692 Old 07-24-2013, 11:31 AM
BamaJeepman21
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Originally Posted by SlackJaw View Post
off 5-6 mph AT WHAT SPEED? Then you can figure percentage.

Your speedo is always going to be off at a constant percent, rather than a constant mph...i.e. if it's off by 5mph at 50mph, then at 70mph it's going to be off by 7mph, but at 30mph it's going to be off by only 3mph. That is why to say it's "5-6 mph off" doesn't tell enough to answer the question your are asking.
So...I've been driving for 6 months thinking that it was always off 5mph everywhere.

If the speedo says I'm doing 60, I'm really doing 65-66.

-Jack
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post #86659 of 109692 Old 07-24-2013, 11:34 AM
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Quote:
Originally Posted by BamaJeepman21 View Post
So...I've been driving for 6 months thinking that it was always off 5mph everywhere.

If the speedo says I'm doing 60, I'm really doing 65-66.
So that means your ready to replace that $40 speedo gear in your transfer case to correct the speedometer?
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post #86660 of 109692 Old 07-24-2013, 11:35 AM
Navydoc1
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Originally Posted by MrDubbe
Yesterday shamed two buddies at a hill climb. Both friends have 01 f-150 3 inch lifts on 35's and think they are Robbie Gordon and have been dissing my jeep big time. Well these two clowns picked a hill and said go for it because it can't be done, first try in 4lo 2nd I crushed it. Well it took them 3 tries each to make it but then they cried about me running in 4x4 so I lined up in 2x4 and in 1st gear destroyed this pimple of a hill. After my last run these guys finally acknowledged that they were impressed, just thought I would share with people that understand.
Silly Fords! Lol
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post #86661 of 109692 Old 07-24-2013, 11:42 AM
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Quote:
Originally Posted by BamaJeepman21 View Post
So...I've been driving for 6 months thinking that it was always off 5mph everywhere.

If the speedo says I'm doing 60, I'm really doing 65-66.
then yes, you should be confident in an estimate close to 10%.
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post #86662 of 109692 Old 07-24-2013, 11:45 AM
BamaJeepman21
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Originally Posted by JBTJ View Post
So that means your ready to replace that $40 speedo gear in your transfer case to correct the speedometer?
A 26th tooth is hard to come by. I'll just wait until the 8.8 with 4.10's is in.

Quote:
Originally Posted by SlackJaw View Post
then yes, you should be confident in an estimate close to 10%.
Thanks.

So 230 miles on 14 gallons, is about 16.5mpg at 70-75mph. If climbing mountains didn't absolutely blow, I'd really keep the 3.07's for highway travel.

-Jack
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post #86663 of 109692 Old 07-24-2013, 11:49 AM
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Quote:
Originally Posted by BamaJeepman21 View Post
So 230 miles on 14 gallons, is about 16.5mpg at 70-75mph. If climbing mountains didn't absolutely blow, I'd really keep the 3.07's for highway travel.
this is where I might be getting hung up then...

230 miles on the odometer, +10% is 253 miles, divide by 14 gallons = 18mpg.

Someone check me on that, am I doing it backwards....if not, then I am incredibly jealous.
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post #86664 of 109692 Old 07-24-2013, 11:53 AM
BamaJeepman21
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Originally Posted by SlackJaw View Post
this is where I might be getting hung up then...

230 miles on the odometer, +10% is 253 miles, divide by 14 gallons = 18mpg.

Someone check me on that, am I doing it backwards....if not, then I am incredibly jealous.
230 is the odometer with the 10% factored in.

I was doing usually a constant 70-75mph with a little 80mph factored in there. 16.5mpg isn't bad at those speeds.

-Jack
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post #86665 of 109692 Old 07-24-2013, 11:53 AM
JBTJ
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Quote:
Originally Posted by BamaJeepman21 View Post
A 26th tooth is hard to come by. I'll just wait until the 8.8 with 4.10's is in.



Thanks.

So 230 miles on 14 gallons, is about 16.5mpg at 70-75mph. If climbing mountains didn't absolutely blow, I'd really keep the 3.07's for highway travel.
Not if you get it from these guys. My son just got one last week. It was also here in 2 days. http://www.transmissioncenter.org/sp...e_and_jeep.htm
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post #86666 of 109692 Old 07-24-2013, 11:54 AM
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Quote:
Originally Posted by BamaJeepman21 View Post
230 is the odometer with the 10% factored in.

I was doing usually a constant 70-75mph with a little 80mph factored in there. 16.5mpg isn't bad at those speeds.
I'm still jealous though.
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post #86667 of 109692 Old 07-24-2013, 11:55 AM
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if you see an extra. grab it and I will pay you to ship it haha.
If you're serious about this, I'm headed to te yard right now to grab one for my friend.
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post #86668 of 109692 Old 07-24-2013, 11:56 AM
BamaJeepman21
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Quote:
Originally Posted by SlackJaw View Post
I'm still jealous though.
It just goes to show you, if you do alot of highway or flat city driving, I see no need to regear and the 3.07's get me around fine.

But, I live in the mountains and it's a complete *****. So for me, a regear is necessary.


I just hope I can continue to see those numbers while running 3,200rpm.

-Jack
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post #86669 of 109692 Old 07-24-2013, 11:57 AM
BamaJeepman21
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Quote:
Originally Posted by JBTJ View Post
Not if you get it from these guys. My son just got one last week. It was also here in 2 days. http://www.transmissioncenter.org/sp...e_and_jeep.htm
Might have to look into that now. Thanks.

-Jack
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post #86670 of 109692 Old 07-24-2013, 12:00 PM
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Originally Posted by BamaJeepman21 View Post
Might have to look into that now. Thanks.
No problem, they are great guys. Have done allot of business with them over the years. They will have what you need.
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