Lutz Auto - Speedometer Correction Device (2 Viewers)
- Thread starter Lutz Auto
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- calibration speedometer
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Pumped to have this unit for my 80 finally reach Australia (not with me yet, mind you, but waiting to clear customs). Thing was stuck in CA for over a month before it left the USA. Been driving carefully in Aus over the holiday period because they’re super strict this time of year.
Hopefully clears customs quickly
Hopefully clears customs quickly
Wow man, mine pretty much came straight from Lutz, no delay in shipping.Pumped to have this unit for my 80 finally reach Australia (not with me yet, mind you, but waiting to clear customs). Thing was stuck in CA for over a month before it left the USA. Been driving carefully in Aus over the holiday period because they’re super strict this time of year.
Hopefully clears customs quickly
Yeah, pretty big delay but whatareyagunnado? Has now cleared customs so hoping it arrives this week.
Maybe I need to order a couple-dozen and on-sell them to locals
lumbee1
Native American
I've got a yellow box sitting in my parts drawer. I installed it once but it did not change the speedo. Not long after that I had battery problems (bad alternator) and removed the yellow box during troubleshooting.
I came across this thread the other day and immediately order the Lutz speedo correction. This seems incredibly simple and easy compared to the yellow box instructions.
I came across this thread the other day and immediately order the Lutz speedo correction. This seems incredibly simple and easy compared to the yellow box instructions.
lumbee1
Native American
Wow. The Lutz Auto speedo calibration is simple and easy.
Before I started I collected four data points (50mph, 60mph, 65mph, and 70mph) and calculated the results. I then averaged the four data points for a -.07% for my final calculation.
It took longer than expected to remove the connector off the TC due to the mud in the clip. However connecting the Lutz Auto speedo calibration was easy and programming was a breeze. I zip tied the control box to the fuel lines and took the Cruiser for a drive. The speedo was perfectly in sync with GPS data and I could not detect anything different from the way the speedo operated previously.
Unfortunately, now that my speedometer and odometer are correct, I was able to accurately calculate that I was only getting 12mpg on the highway
Before I started I collected four data points (50mph, 60mph, 65mph, and 70mph) and calculated the results. I then averaged the four data points for a -.07% for my final calculation.
It took longer than expected to remove the connector off the TC due to the mud in the clip. However connecting the Lutz Auto speedo calibration was easy and programming was a breeze. I zip tied the control box to the fuel lines and took the Cruiser for a drive. The speedo was perfectly in sync with GPS data and I could not detect anything different from the way the speedo operated previously.
Unfortunately, now that my speedometer and odometer are correct, I was able to accurately calculate that I was only getting 12mpg on the highway
Yes love the Lutz auto speedo correction.Wow. The Lutz Auto speedo calibration is simple and easy.
Before I started I collected four data points (50mph, 60mph, 65mph, and 70mph) and calculated the results. I then averaged the four data points for a -.07% for my final calculation.
It took longer than expected to remove the connector off the TC due to the mud in the clip. However connecting the Lutz Auto speedo calibration was easy and programming was a breeze. I zip tied the control box to the fuel lines and took the Cruiser for a drive. The speedo was perfectly in sync with GPS data and I could not detect anything different from the way the speedo operated previously.
Unfortunately, now that my speedometer and odometer are correct, I was able to accurately calculate that I was only getting 12mpg on the highway
Just ordered a Lutz speedometer correction kit. With 35s and 4.88s my speedo is off by a big margin. Only good thing is it makes it seem like I'm getting over 16mpgs... if only that were true.
Does anyone know if the speedo being off also affects when the transmission shifts? It seems like its shifting to 2nd pretty quick and kinda bogs sometimes. My thinking is if its speed related then the trans thinks the truck is already doing 15mph when its really only doing 10, and its shifting earlier than it should.
Does anyone know if the speedo being off also affects when the transmission shifts? It seems like its shifting to 2nd pretty quick and kinda bogs sometimes. My thinking is if its speed related then the trans thinks the truck is already doing 15mph when its really only doing 10, and its shifting earlier than it should.
lumbee1
Native American
16mpg? Wow. The 35's and 4.88's should make raw calculation of mileage actually worse. For instance 35's and OEM 4.10's made my fuel economy seem less but was actually 10% better. With 35's and 4.88's, you're fuel economy is 7% less than calculated.
Installed my Lutz Speedo Correction kit a week or so ago. When I was under the truck this evening I noticed this leak on the TC.
Looks like its coming from the seal between the harness and the TC. Not exactly sure what you call this harness, but does anyone know if this is a simple r/r of an o-ring or is it more involved?
Looks like its coming from the seal between the harness and the TC. Not exactly sure what you call this harness, but does anyone know if this is a simple r/r of an o-ring or is it more involved?
NorCalFJ100
SILVER Star
Haha, thanks! I used all sorts of search terms, but not "speedo", duh.
Trusty Rusty
SILVER Star
This is the way...one of the more satisfying (and cheap!) leak fixes on the 80. My t-case was soaked when I first got the truck and the little o-ring on the sensor did the trick.
Everyone still happy with the Lutz tool long-term? On 37's / factory gearing (gimme a break, I live in Houston where the biggest elevation gain is an entrance ramp onto the highway!) and the truck is off about ~10mph at cruising speeds.
Trusty Rusty
SILVER Star
Is there some super elegant method for calculating your margin of error on for your speedo? I'm running 37's and factory 4.11 gearing. Gathered a few data points yesterday back and forth to the office...figuring I'm approximately 15% low on the speedo vs. actual on GPS.
Planning to install next few days - thanks Mud!
Planning to install next few days - thanks Mud!
lumbee1
Native American
I can't say enough good things about the Lutz Auto Speedo correction. I love this thing. After dealing with an inaccurate speedo for more than 10 years, it makes me feel good that's the speed on the gauge is accurate and I don't have to do mental math.
Another happy customer.
With 285/75R16's on my 80 series with stock gearing, my calculations showed I was ~6.6% off. Previously I had added this correction to the UltraGauge I run but this did nothing for the stock cluster. Enter the Lutz device I've admired from afar the last couple years, that I finally pulled the trigger on.
Zip tied using both mounting ears to the fuel lines, and harness secured to the t-case ground strap.
Clicked the "up" button 14 times for a 7% correction and my cluster speed matches GPS. GPS is a little slow to update and doesn't show me 1/10s like the UG, but seems spot on to the ones digit.
Wish it were this easy to correct other vehicles I own!
With 285/75R16's on my 80 series with stock gearing, my calculations showed I was ~6.6% off. Previously I had added this correction to the UltraGauge I run but this did nothing for the stock cluster. Enter the Lutz device I've admired from afar the last couple years, that I finally pulled the trigger on.
Zip tied using both mounting ears to the fuel lines, and harness secured to the t-case ground strap.
Clicked the "up" button 14 times for a 7% correction and my cluster speed matches GPS. GPS is a little slow to update and doesn't show me 1/10s like the UG, but seems spot on to the ones digit.
Wish it were this easy to correct other vehicles I own!