Ultra gauge way off

Did You get the Ultra Gauge setup correctly in the beginning?
Engine size, Tank Size, etc
Then Calibrate distance on the highway from mile marker to mile marker.
Sound like it thinks it's in a different vehicle


CC

 

I've been where you are since the instructions aren't real clear that you need to add the gallons up as you fill up. Such as first fill up you put in 10 gallons and record in the unit 10 gallons, second fill up you put in another 10 gallons and then record 20 in the unit.

 

you may be on to something. I thought about this last night. When i first got it i plugged it in to my wife's car to clear the check engine. Bet that is where my problem is. Thanks guys. stay tuned.

 

It didn't "learn" anything from her car, but if you never went through the vehicle setup, then that explains why your DTE is off.
It needs to know your engine size, fuel tank size, etc....

 

i went through the engine size/tank size calibration on the truck

 

.........................................And?



CC

 

when i first got it i went through the calibration steps, so a factory reset is all I can think of.

 

Yeah, start at square one
Mine's been accurate since first installed (Sept 2010)


CC

 

i reset everything and started fresh and all appears to be working properly. I went through the calibration the first time, so I have no idea what when wrong. thanks for the help guys.

 

Here is a link for the directions since the unit does not come with any. It took me a while to get mine calibrated, but finally done. I think it is page 29-30. It evens calibrates my speed since I have larger tires. I would do the distance calibration on a 50 mile stretch of highway to be sure. Mine is accurate now and no issues. The fuel level and DTE is spot on with my low fuel light.

http://ultra-gauge.com/ultragauge/support/ultragauge_user_manual.pdf

Speedo say 80

UG says actual

 

80 vs 87.5???????
The UG takes it's information from the same data source as the speedometer. Did you calibrate yours against a GPS or are you just assuming that the UG is "correct"?

Normally, at 80mph indicated, a stock Tacoma will normally be doing around 75.
To get the kind of error that you're reporting, you'd have to be running 35's.

 

I stopped at a mile marker 120 on the highway and reset the trip on the UG. I drove to mile marker 70 and stopped. When I was there I went into the calibration screen and adjusted the mileage to 50 which was the actual distance I traveled. It was off by 5 miles. The faster I go the greater the distance between the speedo and the UG. Cruising around 65 MPH the UG reads 70 which is correct, but the faster I go the more it is off. My MPG is actually very accurate since I calibrated it and has never worked better. THe only true test is to have a car along side of me and give them a fixed speed to travel and compare. I may do that in the near future

 

Odometer and speedometer do not have the same factory error.
Similar to my motorcycle... speedo is about 10% off, odo is about 5% off.

The taco is the same way.
Compared to the GPS, I'm running 70 when the speedo is showing 75 or 76, but the odometer only shows about a 2% error (2 miles off for 100 traveled).

You need to verify speed using a GPS.
Using mile markers works for distance, but 50 miles is not enough.
Even a 5% error is only going to show a 2.5 mile difference in 50 miles.
The higher the speed, or the greater the distance, the greater the number differential will be, and the more accurate your calculated percentage error will be.