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Old 02-24-2011, 12:19 PM   #41
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I bought my gears used of CL from a 2001 4 cylinder. And I did shop around a little, nothing crazy as there are a only a few shops around. If you go here:
http://www.tacomaterritory.com/forum...33#post2121733 there is a group buy on gears from Sierra Expeditions.
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Old 02-28-2011, 10:54 AM   #42
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To the OP...I have seen you in here before and noticed your mpgs that you posted in some other thread a while back, which brings me to my question....How exactly do you drive?? I have a regular cab Prerunner manual with 265/75r16 bfg all terrains with nothing but bilsteins in the front set at 1.75" and I have been calculating my mpg for almost two years now and the highest I ever got was 22mpg...my average mpg is 19.5...and here you are with the same engine as mine. but a spindle lift up front with bigger tires (I think right?) and you are getting A HUGE amount more mpgs than I
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Old 02-28-2011, 11:08 AM   #43
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Quote:
Originally Posted by tmat View Post
To the OP...I have seen you in here before and noticed your mpgs that you posted in some other thread a while back, which brings me to my question....How exactly do you drive?? I have a regular cab Prerunner manual with 265/75r16 bfg all terrains with nothing but bilsteins in the front set at 1.75" and I have been calculating my mpg for almost two years now and the highest I ever got was 22mpg...my average mpg is 19.5...and here you are with the same engine as mine. but a spindle lift up front with bigger tires (I think right?) and you are getting A HUGE amount more mpgs than I
Are you calculating taking into account the larger tires?
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Old 02-28-2011, 11:50 AM   #44
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I never get above 2k rpm in city driving. I drive the speed limit plus 5. I coast to reds in neutral and anticipate the red light. Accelerate with or slightly slower than traffic, no jack rabbit start. I hardly ever use a/c, if I do it stays on Lo. Clean my cabin and air filters regularly. I have all synthetic fluids lubrication my truck. Tires inflated to 35-40 psi. On the freeway I drive cc at 70.
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Old 02-28-2011, 12:17 PM   #45
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Quote:
Originally Posted by chris4x4 View Post
Are you calculating taking into account the larger tires?
My speedo was more accurate with the 265/75/16 than with the 245.
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Old 02-28-2011, 12:29 PM   #46
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Not your odometer though...
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Old 02-28-2011, 12:43 PM   #47
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Actually on the manual transmissions (at least on mine) the odo and speedo come off a gear in the transmission. I tested it one time by unplugging it and driving around my block. Neither the speedo or odo worked. I would've double checked this before posting but it rained today and there's a giant puddle under my truck right now.
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Old 02-28-2011, 12:46 PM   #48
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As far as I know, the ODO reads off a different sensor...
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Old 02-28-2011, 01:13 PM   #49
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I thought speedo and odo were directly correlated. If your drive at A speed which is B difference from actuality, C miles will be D difference? That's how I thought it went.
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Old 02-28-2011, 04:53 PM   #50
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Quote:
Originally Posted by 08pretaco View Post
I thought speedo and odo were directly correlated. If your drive at A speed which is B difference from actuality, C miles will be D difference? That's how I thought it went.

I was under this impression as well.. I have been calculating my MPGs by minusing 18% off my odo reading as my speedo is 18% off..
I would love for someone to prove otherwise thou, as I would gain alot of MPGs back that I thought i lost
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Old 02-28-2011, 06:43 PM   #51
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ODO is based off of revolutions per mile...speed is not.
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Old 02-28-2011, 07:44 PM   #52
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Quote:
Originally Posted by AndrewFalk View Post
ODO is based off of revolutions per mile...speed is not.
Ok so your telling me this is wrong:

Speedo says 70, I am going 66 according to my GPS, difference of 1.06.

When I calculate my mileage per a certain trip and compare it to my GPS trip mileage, I am at a difference of 1.06 (trip contains more than 50 miles to remove some error).

So you are telling me there is no correlation between the 2? I find that very hard to believe.

In no way I am saying you are wrong, but with my observations and record keeping the numbers go with a different theory than you are mentioning.
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Old 02-28-2011, 10:36 PM   #53
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hey oliver, any idea if the first gen front diff gears will fit the second gen? it would be sweet to find a set.
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Old 03-01-2011, 01:16 PM   #54
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Quote:
Originally Posted by 08pretaco View Post
Ok so your telling me this is wrong:

Speedo says 70, I am going 66 according to my GPS, difference of 1.06.

When I calculate my mileage per a certain trip and compare it to my GPS trip mileage, I am at a difference of 1.06 (trip contains more than 50 miles to remove some error).

So you are telling me there is no correlation between the 2? I find that very hard to believe.

In no way I am saying you are wrong, but with my observations and record keeping the numbers go with a different theory than you are mentioning.
The truck is calculating your ODO by measuring the number of revolutions of the tire it takes to cover one mile. It thinks your tires are size XXX, but in fact you changed the tires to size YYY...it is still using size XXX to calculate your mileage. So in actuality, your ODO is reporting less miles than you have really traveled.

In order to correct your mileage calculations you need to account for the difference in circumference of your old tires vs. your new tires. It will probably something like 6-8% off. So you will have to add 6-8% to your ODO reading and then divide by the gallons you used.
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Old 03-01-2011, 02:11 PM   #55
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This is interesting because as we speak I am driving and notice that the speed is not the same between my ultra gauge BUT the mileage is.....damn so I am actually getting freaking amazing mileage if in fact you are right.

398 x 1.075 correction factor then divided by about 17 gallons pits my mileage a little over 25. Hmm thanks for pointing this out I thought the speedily played a part in mileage correlation.

I must have no taken the exact same route that my gpa told me to take or the distance was not accurate.
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Old 03-01-2011, 02:43 PM   #56
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Ok now that I am home.

Here is a picture of my info:


So without taking gearing into account, such as Andrew mentioned, my mileage shall equal:

Miles= 285.3
Difference in diameter per TW tire calculator= 8.5%
Actual Miles = 285.3 x 1.085 = 309.551

Fuel per this trip= 11.2

MPG per this trip = 309.551/11.2 equals......
27.64 MPG

How the hell can that be right lol
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Old 03-01-2011, 07:46 PM   #57
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Are you taking into account the change in your gear ratio?

I know you're using an ultra guage but for reference the scanguage manual talks a little about how to adjust it to changes in gear ratios and tire sizes.

Quote:
The right and left upper buttons can be used to increase/decrease the
selected adjustment in 1% steps. The lower left number is the speed
reported by the vehicle. The lower right number is the speed which will
be shown by the ScanGaugeII by applying this correction. Positive
values of % will increase the displayed speed. Negative values of % will
decrease the displayed speed. The approximate % to use for a tire size
change can be computed by dividing the diameter of the original
equipment tire by the diameter of the new tire, subtract this from 1 and
multiply by 100. For instance, if the diameter of the original tires was 24
inches and the size of the new tire is 30 inches, 100x(1-(24/30)) = 20.
Setting the value to 20% will compensate for the tire size change.
For gear changes, the formula would be 100x(1-(new ratio/old ratio)).
For instance if the old ratio was 3.55 and the new ratio was 4.10,
100x(1-(4.10/3.55)) = -15%.
If you think you're speed is off then do both of the above calculations and then add the two numbers together to get your total deviation. You can always check your speed with a GPS.
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Old 03-01-2011, 08:37 PM   #58
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Quote:
Originally Posted by afd23a View Post
Are you taking into account the change in your gear ratio?

I know you're using an ultra guage but for reference the scanguage manual talks a little about how to adjust it to changes in gear ratios and tire sizes.



If you think you're speed is off then do both of the above calculations and then add the two numbers together to get your total deviation. You can always check your speed with a GPS.
Not to be rude but have you read the previous posts in this thread? I was taking into account the larger tire diameter and over gearing factor in my original posts and thoughts. The post above yours is in reference to what the Andrew person said that gearing plays no part.

It was more of a sarcastic post. There is no way in hell I am getting 27 mpg, which is why I posted that to maybe have him think a little about his approach.

In no way am I saying I am in the right, I am just presenting the facts and making ends meat of the numbers presented. My thoughts give me a real mpg that makes sense, the other way just doesnt seem real to me.
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Old 03-02-2011, 06:16 AM   #59
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Yea you have me a little confused. I'm not positive if/how the re-gear affects your ODO readings. But if you merely changed tire sizes, then yes, the method I mentioned would be correct.
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Old 03-02-2011, 06:51 AM   #60
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Quote:
Originally Posted by 08pretaco View Post
Not to be rude but have you read the previous posts in this thread? I was taking into account the larger tire diameter and over gearing factor in my original posts and thoughts. The post above yours is in reference to what the Andrew person said that gearing plays no part.

It was more of a sarcastic post. There is no way in hell I am getting 27 mpg, which is why I posted that to maybe have him think a little about his approach.

In no way am I saying I am in the right, I am just presenting the facts and making ends meat of the numbers presented. My thoughts give me a real mpg that makes sense, the other way just doesnt seem real to me.
Yeah I've read the other posts. It seemed like there is some dispute over if what you're getting is correct. I agree with you that 27 mpg seems outlandish and not considering the gear change will lead to incorrect numbers. I posted the scanguage formulas so that you (and others) could see how they account for both gear and tire changes. The % that comes out of the formula is used on the SG to calculate correct speed AND mileage. I don't know how the ultraguage works or how it allows you to adjust speed and mileage.

I guess I missed your point in the previous post that you were NOT taking into account the gear ratio change. I probably should've explained what I meant a little better.
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