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OK, I am going to forward this and see if they get the adjustment theu want for 2.87 gearing.
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Not really, but I detailed HOW you come up with one that works, in a post above. So you can start with my settings, and see if you need to adjust.Has we come to a consensus on the dip switch settings for the 2 high speed gear setting(3.07 and 2.87)?
"Simple" is not the same thing as "quick and easy". Lots of things are conceptually simple, but a pain to actually do.This should be very simple. Hook up a scope and find pulses per mile. Set up a benchtop pulse generator to the calculated PPM you want and start flipping to find the pattern of the switch settings.
you can use this calculator to determine true on the ground final gear ratio with different size tires. (3,07 upgrade and the 3,90 the OEM gear ratio, is with stock tires size) also, remember to double those ratios above, in the calculator (example 6.14 instead of 3.07) to account for the 2:1 reduction at the wheel ends.I thought the 3.07 setting was figured out?
Will have to figure out 3.07 with 48" tires...
Why do all that? You just take the percent change of the diameter and that will be your percent change in speed too.you can use this calculator to determine true on the ground final gear ratio with different size tires. (3,07 upgrade and the 3,90 the OEM gear ratio, is with stock tires size) also, remember to double those ratios above, in the calculator (example 6.14 instead of 3.07) to account for the 2:1 reduction at the wheel ends.
PS- ignore the "new ratio needed" calculated by this site. It is only the "effective ratio" your looking for.Gear Ratio Calculator
Easy to use gear ratio calculator. Use our gear ratio calculator to find the correct gear ratio to run when changing tire sizes to keep your stock gearing.tiresize.com
somewhere in here I put in a thread the calculations of 3:07 upgrade with the 14r20 size tire ... and speed at each gear in the tranny .. was good while back.
thought he was looking for overall effective ratio in this case..... not speeds. (btw the 14r20 at 49"-ish height; with 3.07 gear has an effective ratio nearly the same as having stock tires and the more rare other ratio available for these axles (2.87) )Why do all that? You just take the percent change of the diameter and that will be your percent change in speed too.
Stock tires are 46.4" tall. If you get 48" tires, divide 48" / 46.4" = 103.4%. So when your speedometer reads 58MPH, you'll actually be doing 58MPH * 103.4% = 60MPH
Probably not even worth adjusting it, for 2MPH.
there are 2 setting people have said in this thread for an A0 truck with 3.07I thought the 3.07 setting was figured out?
This is one of the things I wonder about in the discussions about fuel mileage. I have a suspicion that the LMTV odometer system (meaning it could be the fault of the odometer, the sender, or other parts in the system) is fairly inaccurate.Then I tried to see how the odometer was reading. Using the mile markes on the side of the highway the odometer was showing 1.1 miles for every mile marker I passes... so about 10% fast. I am tempted to try the first setting to see if the odometer reads correctly . Has anyone else tested their odometer?
Yes sir... It seems that people will only check the speed and not the distance. The strange thing is that the GPS speed and the speedometer is the same why is the odometer off? I am going to play around with a stop watch and mile markers and see if that agrees with GPS and speedometer. I have been wanting to make some videos for youtube. Maybe I'll start with this?This is one of the things I wonder about in the discussions about fuel mileage. I have a suspicion that the LMTV odometer system (meaning it could be the fault of the odometer, the sender, or other parts in the system) is fairly inaccurate.
People report mileage numbers that are just not possible, according to physics. There are a whole bunch of reasons they could be getting those numbers (e.g. just guesstimating optimistically / not calculating, speedometer settings have been messed with by GI mechanics, running different tire pressures changes tire diameter and thus actual distance traveled, etc.), but there are enough people who say they are actually trying hard to calculate MPG, and then get wildly different (and often physically impossible) numbers, that something else is going on too.
There are no other switches that are exposed. I've never tried taking it apart to see what's inside.Yes sir... It seems that people will only check the speed and not the distance. The strange thing is that the GPS speed and the speedometer is the same why is the odometer off? I am going to play around with a stop watch and mile markers and see if that agrees with GPS and speedometer. I have been wanting to make some videos for youtube. Maybe I'll start with this?
Is there any other settings/switches on the speedometer. The odometer is how the speedo should be set. That is a direct pluses to distance so you don't have to worry about how fast you are going... just a distance.
It isn't clear that it's that easy.I have 2 different apps that use GPS for speed and they don't always match, so I would have to use mile markers over a longer distance to get an accurate reference.
A 14x20 tire is 1.427 x the diameter of the 395/85 R20, or a 150.79" circumference vs a 105.68" circumference, or a 42.68% increase of travel per revolution.
This would be in addition to the 3.07 gear change....
My point of the post was to get an idea of the switch positions for that combination.
What I'm talking about with Little/Big Endian is which way the digits go.Code is beyond my level of electronic expertise
Is your speedometer an Ametek? All those I have are Medallion.I Googled Ametek 900 speedometer calibration