Speedometer Calibration - Adjust for Bigger Tires - Accurate Shifting & Fuel Economy
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- เผยแพร่เมื่อ 30 ม.ค. 2020
- Calibrating the speedometer on a 2016 Ram 1500 with 35" tires using a Hypertech Speedometer Calibrator.
I decided to do this calibration after noticing a significant decrease in performance from my truck with the larger tires, mainly how it required more throttle to achieve the same acceleration as before. I attributed this to the truck assuming it is travelling faster than it actually was and deciding not to downshift at certain speeds with smaller amounts of throttle. This was especially noticeable when driving up steep hills.
Link to the calibrator I used on my Ram: amzn.to/2YrplHO - ยานยนต์และพาหนะ
Put a good number of km's on the truck today and I can confirm that it is driving much smoother, especially rolling on the throttle I can feel the torque converter lockup releasing and gaining a few extra revs to aid in acceleration with less throttle than before.
How did the truck shift before adjusting the speedometer?
The biggest difference I noticed after installing the bigger tires was when I'd roll on the throttle to accelerate a little that the truck would sometimes stay in the same gear instead of downshifting, because the speed to throttle ratio at certain speeds wouldn't trigger the downshift, similar in theory to changing axle ratios (though not as extreme). Combine this with with the MCD eco mode and it made the truck feel pretty sluggish. After the Calibration throttle response and downshifts were much better.
I should also mention that although it's called speedometer calibration, you're actually setting the tire size for the ecu/tcm to use for speedo, odometer and any other calculations such as upshifts, downshifts, eco mode, etc.
Thanks for the info. The reason I ask is because I have had a shudder when the truck shifts. Mostly lower gears.
When I originally lifted the Truck I had 35" tires put on it. I went to ram and had them program the truck as close as they could get to 35" tires. I had no issues for quite a while. I put a new set of tires on it and shortly after I noticed the shutter began. I purchased a rough country speedometer calibration device. I program my truck for 35" tires but the shutter was still there. I then noticed my speed was approximately 4 miles per hour faster on the speedometer then what my actual speed was. I was driving 70 miles per hour on the GPS but my speedometer showed 66. I did some research and noticed a lot of guys just slowly decrease the tire size on their speedometer calibrated or and till the speeds match on the gps and a dashboard. I started that process today at 35" and worked my way down to 33.25" and that got the speed on the dashboard the same as a speed on the gps. I haven't felt the shudder since I did this but I've only driven it a few miles of on my way to work today. Originally I thought I was having torque converter issues with the shutter. Now I believe it was just the speedometer off so far like you said it messes with the shifting.
@@Johnsplots I had to adjust mine lower as well, this is because the lower radius of the tire is much less from the flat foot print where it contacts the road. So if you were to double this new radius you'd have the size that matched the gps. (hope I explained that well enough). Not sure what the shutter you're feeling is but hope it doesn't come back!
I used this on my 2015 silverado. And it fixed my speedo.. also gave me better gas mileage.. thanks for the video!
Awesome, glad to hear!
Did you know that with oversize tires and no speedo calibration the distance traveled between oil changes is also incorrect meaning you could be 200km or more overdue for each oil change. Keep that in mind as your engine gets older. @hypertechperformanceofficial
200 km is nothing!Even 2000 km more is never a problem!
I agree it isn't a huge issue. But depending on engine condition, grade of oil used and change interval it is something to keep in mind. I have a fairly new engine, use synthetic but change every 10,000km... If I overrun a change a little now it isn't a big deal but with an older engine or lower grade oil it wouldn't be a good idea.
Actually the engine won't see any extra miles it actually sees less...the tires being bigger travel the greater distance...meaning miles driven are a hypothetical 1:1 tire rotation to engine rotation ratio with the stock tires 3000 tire rotations =3000 miles traveled..larger tires means a greater ratio hypothetically 1.5 :1 if the tire is 50% larger than stock 2000 tire rotations = 3000 miles traveled
This is correct. I think the point I was making was that we measure the useful life of an engine by the number of miles it has driven, so if it says fewer miles driven it could be mistakenly assumed the engine is less worn.
That tool is WAY more expensive than I thought it would be
Yeah, way too expensive for what it is. Plus build quality and technical ability, it's a $30 tool xD
It is alot of money for a tool you use once then tuck away in a drawer. I just came across it this week while organizing my tool box.
It’s something a shop uses, and something an ordinary Joe rents to use once.
Thank for addressing this topic, but Did you post the part # for this unit?
I used Hypertech part # 752501 for my 2016 Ram
Great video!!!
But will using this device void warranty?
That I'm not sure of. The unit saves the factory settings before Calibrating and the manufacturer recommends reverting back to the factory settings before going for any warranty work.
In my opinion the dealer will look for any excuse to avoid paying for warranty work so I would do my best from letting them know about it.
I got a ram 1500 2023. The dealer had 35 Firestones on it and using WASE I find when doing 60 by the car it's 66 gps, 75 is add 7 for 82. I was going to get obdalfa but it requires a cable to bypass the obd security! And the cable goes WWAAYY up the panel below the steering wheel. So I just subtract. 4 for anything in the 40s, and 6 for 60s. The dealer said they couldn't calibrate the speedometer.
I'm curious to know if this calibrator would work with the 2018+ models
Hey bud how big did you go on your tires ? I have a 2017 ram 1500 and want to put 35s by 11.5 on a 6112 bilstein height adj. Leveling coilover kit... now am i going to need to recalibrate lile you did? Im going to be going up about 2" and will be putting nittos Ridge grapplers, would i have to do this as well? And or would the dealership do it for me? Also would this void warranty?
I have 35s on my truck. It really threw the Speedometer off when I put them on. I recommend doing the Calibration if you go that big. The dealer can only set the ECU to larger sizes available as options from the factory. Many people (me included) get this done to minimize how much the Speedometer is off but is not enough beyond 34". As far as warranty is concerned the Calibrator saves your factory settings on it and can return the truck to original settings if necessary then can switch it back when needed. This is handy when you need to go for warranty repair work.
@@nothandsomebuthandy gotcha! So say i did 34.5s lol would i have the same stupid problem with the speedometer? Or like 34s by 11.5s ? Just with the suspension im putting on it and the tires dude im running out of money here lol and idk how much this calibrate tool cost looks a little complicated but your vid deff helped alot
Same problem but if you get the dealer to select the biggest tire size in the ECU it's only off by a few mph which you can probably live with. That cost me about $50 at my dealer. The calibrator can do any tire size, as many times as you want on the same vehicle for $170usd on Amazon.
@@nothandsomebuthandy gotcha ok bro cool thanks alot for all the help man!
Good luck!
Do you know if this would work on the 5th generation Rams? I have a 2019.
There might be a different model number, check out the hypertech site and punch in your year and model.
If you need any help let me know.
I wonder if this would work when you change you rear gear ratio?
Yes it will, you can enter the axle ratio during setup.
@@nothandsomebuthandy thats good thanks for the info👍
Does it adjust the shifting speeds also
It doesn't allow you to adjust the shift points manually but by adjusting the tire size the tcm will take into consideration the vehicle speed, engine speed, engine load, throttle position, tow/haul option and shift for best performance or fuel economy. A fully featured tuner may let you adjust more settings.
i have a hypertech calibrator and i tried to use to on my 2013 ram 1500 and it kept saying error so i tried to pull some fuses because i saw on the internet that u had to disconnect all the power running to my truck like subs and radio but i could never find out how to turn the radio off (since it turned on every time i turned it to run) so it never worked and i gave up but looking for help i have 35/13.50/24
What model Calibrator do you have?
@@nothandsomebuthandy #752501 it says it’s got a 03 and up chrysler/dodge
Just looking quickly on he hypertech site the 752501 is only available for 2006+, perhaps there was an Ecu upgrade that year? I might dig a little deeper after work.
@@nothandsomebuthandy it erases all of my codes but when i go to the next section it just says error. i was think it was because i had power drawn from the battery or it needed to be unlocked idk, but thanks just let me know
Do you have a check engine light on or a permanent code that might need to be cleared? I remember something in the manual about that.
Is this possible to do with a really good obd scan tool?
No scan tools that I'm aware of but I've only used cheap ones. Many engine tuner modules will do it though.
@@nothandsomebuthandy I was just wondering because it plugs into the obd port so figured they are both talking to the ecu so why not? We just bought a really good one for work so I'll check it out on Monday, otherwise our mechanic has an even better one.
Let me know how you make out!
Did your MPG change at all? I have same issue and only realized when I passed a construction area going what I thought was 80 and it read 85... My MPG was terrible I was going faster that I thought sometimes I was setting it to 82 mph and was in reality going 87-88. Set to 75 which was 80 and truck gained over 2 mpg. Pay attention if you put 35's on!
Fuel economy definitely drops off fast with these big rigs after 80kmh they're not the most aerodynamic. Add to that the fact that most vehicles are geared for best fuel economy at 55mph (88kmh) once we put bigger tires on were are essentially changing those gear ratios. The Calibrator lets the vehicle adjust the shift points to compensate.
What apps speedometer do you use?
In this video I'm using one for android called SpeedView.
How many miles more did you get per gallon after you did this
It's hard to say if it made any difference on mileage since the bigger tires and lift kit added so much rolling resistance and drag. What I did notice is that the truck feels like it's in the correct gear based on the load compared to before.
@NotHandsomeButHandy 1: nice name of ur TH-cam channel
2: I need this device. I have a 2015 lifted Scion xB, with 215/70/16 so that’s 27” or 27.5” tire size. I get 2-3 mph off and 2 mpg loss. Which I’m use to it. Not a huge deal.
But what it caught my attention, is that u can re-gain the mpg? Now I’m interested. Because it’s 15.5 mpg on my xB. Yeah I’m in a 4Runner territory 🤣🤣🤣
So did it regain ur mpg?
It's hard to say if you'll regain mpg as lifting the vehicle creates more wind resistance and no tuner can fix that. But since the larger tires have thrown off the vehicle speed to the ECU it's possible the transmission shift points are not optimal (if it is automatic). A tuner could allow you to adjust this setting (tire revolutions per mile), but I'm not sure what is available for the xB or what settings can be modified.
@@nothandsomebuthandy thanks for the response. Yeah and it is a 4 speed AT.
And what do u mean by create more wind resistance? Does it mean I get more wind noise or reduce it?
When it comes to fuel economy the easier your car moves through air the less power is required to move it, so cars are designed with better aerodynamics than others. The xB is kind of a box, like a jeep, and not very aerodynamic. But little things like being close to the ground, side skirts, elements and diffusers on the bumpers, etc all help to channel the air and reduce drag. Typically by raising the vehicle you allow more air to flow under the car theoretically creating more turbulence and drag.
@@nothandsomebuthandy man that’s pretty informative man. The only way I can get my mpg back up a bit, is 1: upgrade my CAI/SAI. Or get a custom intake pipe and hook up a snorkel I want
2: get those windbooster device, for those that have modern cars with electronic gas pedals. Just connect between the wires that’s being control, to the pedal. And u can setup few things. Normal, economy, sport, sport+, and race mode. With race mode. The throttle body kicks in full fledge as an instant power. Not increasing hp. Setup economy mode will reduce that pose and create lag of the throttle body. Making it a bit harder to full throttle, but more beneficial of create better gas mileage.
That sounds pretty interesting! I'm not familiar with that at all but might be worth looking into.
I have the same problem because I put different tires on my Honda CRV and now my speedometer is 10% off but so far my research says there's nothing I can do
It doesn't seem like there is a end user option like the hypertech calibrator but it is possible that the dealer or a shop with a high end scan tool may be able to adjust the revolutions per mile. The reason I think this is possible is the CRV's from 2012 onward came with different wheel and tire options with different sizes ranging from 692 to 747 revs per mile. This suggests to me that there are options in the ecu to select the correct wheel size for the car. Might be worth looking into.
Also don't be discouraged if a dealer tells you it's not possible, try calling a different one or try to catch a tech-savvy technician. I had my Ram adjusted at the dealer before I bought the calibrator to do it myself as they had only limited options. The first time I went they told me they could not do it, once I returned with the mopar instructions they did it for me.
Will this vold your factory warranty?
Yes, no, maybe. The calibrator saves the factory settings and you can just plug it back in and go back to factory if you ever need to go in for service. But the settings it changes are the same that the dealer can do for you as well, so most may not even know that a change has been made. That said if you get a picky dealer then maybe.
Can I use this device in my 2001 landcruiser 100 series V8
No it won't sorry. But I did a quick google search and found that a company called Lutz Auto make a calibrator for that model. PART # LTZ-80SCD
Is it work Lutz. Are you sure 😊
@rktipsbyshaheen9537 I have no idea, I have never heard of the brand or know how it works. From the description it seems like a fairly easy setup. The price seems pretty reasonable to try.
Someone changed the transmission on a chevy and now the vehicle has to go 61 to go 50. I don't own it but it would be helpful.
Depending on the year a Calibrator like this may fix that issue, or maybe the dealer could program a change. If it is older they have little plastic gears that you can swap out to match the gearing.
Watching this bc I was going 70 in a 60 and the mf said I was going 85 :/
Yeah that can happen 😬
3:50 LMAO!
Haha
Can someone explain to me. I’m sorry if I’m lost.. so bigger tires (perhaps a lift) will cause the mileage to document slower????
Tires yes, lift no. Your truck calculates your speed based on how many rotations the axles make in a given time. A factory sized tire say 31" tall would have about a 97" circumference so for each rotation you would have traveled 97". If you install a bigger tire say 35", then for each rotation you'll have traveled 110", but the truck still assumes you traveled only 97". Speed is calculated as distance traveled over time so if you are traveling a further distance then you are moving faster than the vehicle is displaying.
And if the distance traveled is actually more than what is being calculated then the distance displayed on the odometer will be less than what was actually traveled as well.
Sorry if that response is a little confusing, I'm a robot.
Why are you in Km/Hr sir??
I'm in Canada
My bad about the speed my dude . My eyes 👀 still tell me that’s snow on the sides of the road or nah ? lol
Oh yes that is snow in the ditches, that usually stays long into spring despite warm temperatures and clear roads. Do you have snow on your area? Here with winter or snow/mud tires the speed limit is typically met or slightly exceeded in all but the worst snow/ice weather.
@@nothandsomebuthandy I’m from Mississippi. 3” of snow closes school . lol
Haha that makes sense. If you grow up with blizzards and freezing rain you learn to drive in poor conditions (most of us do anyway 😂). Also many of us have metal studs on our tires for ice. Check out my DuraTrac review video.
Got a ticket from this issue
Oh wow, from bigger tires and incorrect speed?
@@nothandsomebuthandy yes.. was going 70 in a 55 but my speedometer was saying 60
Sorry to hear that. Have you installed a Calibrator, or are you thinking about it?
@@nothandsomebuthandy yea I am.. might have to take it to a shop to do it
I recommend doing it yourself or finding a friend who is a little tech savvy to help you. The reason why is that if you notice on the video I had the dealer program my tire size but were limited in options in the ecu, and when I did it myself the first time the tire size I entered threw the speedo off in the other direction. The best way I found was to choose a tire size close to the actual size then go for a drive with a gps speed app on your phone (trying to maintain a steady speed) and compare. Then adjust the tire size in the programmer until you find the size that is the closest to the actual speed. I feel like not all shops would be this thorough.
Why play music barely here and understand
Hi Martin, sorry the volume levels aren't great and you're finding it hard to hear me. Maybe the Closed Captions option might be helpful for you? If not, feel free to ask any questions you may have and I'll try my best to answer them.
Why would you round up and not put the exact tire size and that’s just idiotic. you go through the whole process and then don’t put in the measurements correctly?!
The exact size wouldn't give the exact speed.
Another piece of digital JUNK in foreign measurements. I have mechanical odometer in my 95 f250 that the speedo runs about 5 mph high. I have 16" street tires on.
Hey if it works for others, it’d not really junk. So relax lol
Are you looking to make the Speedometer match the actual vehicle speed?
Not smart either. Turn that stupid music off and enhance the sound.