Sure you got the diff right? My x3 always got it wrong, even if it's set right to the diff you know you have, try another setting, mine suddenly great at all speeds.

 

In the form for the tune I put that it had factory 3.73s. I guess I could manually put that in to make sure it's correct.

I played with the tires again today, I went down in revs and it brought it closer. When I got home I went down another 5 revs pre mils. Hopefully I'm still closer.

I'll also throw in the diff next time just to make sure they tuner didn't leave some other setting in there.

 

Just got a lift kit for my baby, and installed the new spindles.

 

As i said, mine was off, despite having the tune set it - i played with the revs/miles but it was never accurate at all speeds and was certainly not the right way/solution for the issue.
I can't remember now if my tune had either, the wrong ratio in it, the right ratio, but needed a 'wrong' ratio to read right, or defaulted to something equally as stupid.

Either way, i set either my diff again correctly, or told it that there was a different diff in there, and it went perfectly, annoying 'bug' but it worked.

 

Great info. I'll play with the rear diff info and see how far it makes everything, or if it makes it closer.

I think the tires are roughly 657 revs per mile. I have it on 650 or 645 now and it was a little closer. I adjusted it again when I last got home, down another 5 revs. We'll see if it's any closer. I was still about 3mph off at 45mph.

Who did your tunes? I wonder if they could have screwed something up when typing in parameters.

I had issues with email tunes in my Mustang. Even with several datalogs they couldn't get it right so I ended up with a dyno tune that helped a lot!

 

why guess on revs. Just put a mark on the tire and corresponding mark on the ground. Have someone move the truck so it makes three full revolutions. Measure the distance. Divide by 3. Divide 5280 by that distance. That's your revs per mile.

I finally checked my air pressure. Ds front 17, ps front 30, ds rear 32, ps rear 33. I bumped them all 35. I'm coming the truck up today, so I'll refill it tomorrow and check mileage.

 

Here is my fuel mileage to show the drop.

The first photo is most current, with each photo getting older. The columns are miles, gallons, mpgs.

I almost exclusively drive my truck too work. It's the same commute daily. And about 80-90% Highway. Round trip is 110 miles.

 

I guess you could do that. If you wanted to be accurate about it and get it right the first time without guessing. But who would want to do that?

 

It was for my Mustang i used to have, was a few years ago now, but yes it was an email tune.
If you're trying diff options, go ahead and reset everything else back to the tune settings/default first.

 

Well today's tank was 18.4. Back to normal

 

It's amazing what tyre pressures can do over a tank, everyone forgets them as the temps drop.

 

I went online and looked at revs for my particular tire and size.

So my tune had a default setting for the rear diff that says something like "Axle ratio: Stock" I went into it and made it reflect 3.73. After driving down the street the speedo was actually reading a few mph lower than it should so I readjusted the tire revs to where it should be. Haven't driven it since then but I think I'll be golden now.

Weird how the axle ratio changed all that, especially since it was supposed to be tuned for 3.73 already.

Anyway, thanks for the help guys. I think between the axle ration and the tire revs I should have it hashed out in my trip.

 

You will find your speedo reading a few mph lower is normal, that's how they came from the factory, you can correct if you wish though, obviously

 

I'd like it be as close as possible. For speedo purposes and for odometer mileage. I don't want to rack up more miles that I'm actually driving causing my Ranger to list higher mileage if ever I get ride of it.

 

still guessing. Rim width, vehicle weight, air pressure all effect that.

 

Snow's a coming...... time to put the pontiac away and bring out the ranger

 

I should try and do a few doughnuts with it if we get enough snow, the tires aren't very good.

 

I doubt I'll see any snow here in south Georgia. Though I hear a few hours north in Atlanta they're getting some snow.

 

We got 2-3 inches and all of the salt garbage is on the roads now :( :(

 

Nooo! My Ranger came from Canada. Luckily they sprayed that tar crap all over the underside so most of it is rust free. It does have some rust in certain areas though.

I've never lived in snow and I've only been in it a few times during my travels. It looks pretty but that's where my appreciation for it ends. I hate the cold! ! ! !

 

Its been i PA all its life... but it was taken care of and only has a little rust in certain area's. I hear a good way to get the salt out from under is get a lawn sprinkler and pull it under the car slowly and will spray a lot of that junk off.....

 

Lawn sprinkler sounds like a smart idea. Hopefully I'll never be in snow though, haha.

 

Changed the oil. Rotated the tires. Pretty sure ones got a slow leak. They're a bit checked and cracked so if it is leaking, i'll replace them.

Pulled the bumper to try and fix the lower valence, no dice. Put the bumper back on.

 

More snow on the way, fun to play in with the truck but dread the darn salt junk...... Also the truck just passed inspection and didn't need anything.

 

In Northern Ohio up here been getting steadily annoying bit of snow, just enough to slush the roads and have to snap the wipers to knock off the ice. Didn't do to bad for a days driving, just no fast acceleration, due to slippage, but found putting a heavy duty hydaulic jack over each wheel helps a lot and this way I don't have sand in the bed if the tubes break.