How To Fix A Misreading Speedometer
HTML-код
- Опубликовано: 2 май 2017
- How To Correct A Speedometer - Honda S2000 - Speedo Corrector
RaceLogic VBox Sport - amzn.to/2nPBBwX
Subscribe for new videos every Wednesday! - goo.gl/VZstk7
Product Links:
Vbox Sport - amzn.to/2nPBBwX
Yellow Box - yellr.com/
Fixing the speedometer on my Honda S2000, which as you can see clearly reads too high. While traveling at a GPS verified speed of about 80 to 81 miles per hour, you can see the car’s speedometer is reading 87 miles per hour, significantly higher than the actual speed. This is a result of changing the final drive gearing in my S2000, but you could also have a speedometer reading incorrectly from putting on different tires or wheel sizes. To correct this, first you need to know how much your speedometer is off by. You want to travel at the highest legal speed you can near you, so that you can have an accurate percentage difference. In my case, driving at about 81 miles per hour shows a speed of 87 mph, so my car is reading about 7.4% high.
Next I’ve purchased a Yellow Box correction kit. These can be used for many different makes and models of vehicles, simply splicing into the speed signal wire, or by using a plug and play kit they provide, also available for many different brands. The first thing we need to do for the install is lift the front of the car up onto jack stands. The speed sensor for the speedometer is on the transmission for the S2000, so we’ll need access to it. Once underneath the car, unplug the sensor from the transmission, and plug in the new harness. There will be plenty of wire length for the Yellow Box to plug in, so at this point I pulled the connector out from under the vehicle to program it. Then plug in the Yellow Box.
Turn your ignition to accessory mode, and you should see some lights flashing on the Yellow Box. Once powered, the box will tell you what the current correction factor is, by flashing the red light. Short flashes represent a count of one each, and long flashes represent zero. In this case we have 1 flash, then four long flashes, meaning 1 0 0 0 0, or 100.00% correction factor.
My S2000 is reading about 7.4% high, so we want a correction factor of 107.40%. To program the box, hold both buttons for about 5 seconds, until both green and red lights flash. Now, by pressing the plus button, the correction factor will go up by 0.1 percent. Pressing the plus button 74 times will give us our 107.4% correction factor. You can also hold the button to speed this up.
After you’ve programmed it, wait for both lights to flash. This informs you the setting has been saved. Turn the car ignition off, and then turn it back on to check that the setting is correct. Once powered, the device automatically reads the current setting to you.
I’m simply choosing to zip-tie the Yellow Box for now, directly beside the transmission housing. The device comes with a 10 year warranty and is weatherproof, heatproof, and vibration proof, but make sure you don’t place it near your exhaust or extreme heat sources. With the device in place, it’s time for a test drive. As you can see the car now reads much closer to the actual speed, and is reading just slightly conservatively high, which I’m fine with. You could choose to fine tune at this point if you prefer.
Engineering Explained is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.
Don't forget to check out my other pages below!
Facebook: / engineeringexplained
Official Website: www.howdoesacarwork.com
Twitter: / jasonfenske13
Instagram: / engineeringexplained
Car Throttle: www.carthrottle.com/user/engi...
EE Extra: / @engineeringexplainede...
NEW VIDEO EVERY WEDNESDAY! 
Авто/Мото
"Highest legal speed near you..." Mate i live in germany.
Wir habens halt gut :D
no speed limit then
iSuchtel 155 mph it is! 😂
damn came too late. was about to write the same joke :/
Engineering Explained No, it s as fast as you want... in most case
How to fix a Speedo. Boy was I misled.
disappointed*
podgehog Its a joke lol
you're looking for a Cluster not a speedo
u stoopit, lol!
Brian C Same. lel
Oh thank God someone made a video about this. I was looking all over the internet for an easy fix but all I found was tuning and other expensive solutions. Thank you so much for bringing this product to my attention.
I often wondered if there was a way/device to correct this. Awesome! I'm really enjoying your channel, it's a perfect blend of education and entertainment. And helpful tidbits of info like this are GREAT
Every time I fire up an Engineering Explained video, and I hear Jason say "hello everyone and welcome," I truly feel welcome.
Thank you for following through on this. Good idea to use the GPS instead of doing the math on the old and new final drive ratios as that would have caused you to retain any built in OEM based speedometer error. For now you know your speedometer reads just slightly high at 80 MPH - should help you stay out of trouble. Great video, thanks again.
I just use the radar gun equipped speed limit sign cuz it tells me my speed when i drive past
Jason, you make really good content. Keep it up! Also, the reflection was just beautiful.
y dont he use white board and formulas
Cyril Matthew Why doesn't he use a whiteboard and formulas?
Amazes me the level of incompetent grammar.
Don't you people realize that people perceive your intellect level by your grammar of your posts?
Grammar as horrendous as this tells me you don't even have the iq level to tie your own socks
GET SMARTER !!!
Kristopher Klassen I love when people complain about someone's grammar but have grammatical errors in their own comment.
ohh yeah ... i dont care what people think about me ... and the so called intellects like you may not have the ability to understand the sense of sentence and boasts about the grammar LOL ...are u shakesphere, wordsworth or keats ... your comment tells me that you dont even have the commonsense of a baby so your IQ is beyond any thing in this reality can expalin ... oh sorry u dont know what common sense is ..ryt???
i wasn't insulting the show host ... jst posted a random comment coz i used to see him explaining things with boards and formulas ...
tie your socks or shoes, its not people, its you who perceives intellect with the level of grammar that too in an independent and informal platform like this ...
I prefer the plug into the OBD2 port and change the setting in the computer method. Might be worth a call to your local automotive shop as many of the common Snap On scan tools can make adjustments for tire size in the computer. Depends on the vehicle though. I know the Chrysler OE scan tool also has a similar adjustment capability.
Thanks for your videos! Always quick and easy and helpful.
This was so neat, I always wondered how to fix that!
Yup same here 😁
What a jank interface.
It's cheap, simple and works what more do you want?
I meant the design is cheap. The ludicrous price is another argument
I don't know why it costs that much, but if it had a GUI it would be far more expensive. Hell at that point seems like it would make more sense to just make a phone app and an adapter for the phone.
Actually that seems like a pretty good idea now that I think about it.
It doesn't need a GUI. It just needs a 7 element LED that displays a number, instead of some random ass blinking lights.
screwaccountnames agreed, but why bother putting time in effort, where in most cases it will be programmed once in its lifetime which takes 5 mins. That being said it should be $40 not $100!
Tunes it really low* Yeah, I could 0-60 in 1.15 sec. Watch me.
Quite different than the way I corrected my speedometer on my 65 Mustang after I installed 4:11 gears. I had to drive a measured mile and note how much mileage went on the odometer. There was a formula (don't remember what it was) used to determine which speedo gear to use to replace the stock one on the cable. Changing the gear to a different number of teeth brought the speedo down to a more accurate reading.
Hey Jason, I imagine you've probably seen it, but Jason Cammisa uses your observation that the P100D accelerates pretty much as fast as it brakes in the latest Head 2 Head. Kinda cool!
Finally a video that goes straight to the point and gives an easy fix. Other videos start rambling nonsense for 4 minutes at grandpa speed 🙄. Now got to go find such yellow box specific for my car 😀. Edit: i see the yellow box is 100$. I guess I'll just remember the offset which is free. Edit2: I just ordered a GPS speedo for 20$ from Ali, stick that on the dash, job done🙂
thanks for another practical and helpful video!
The more you know: It is illegal in Germany for a speedometer to display too low speed, but it *is* allowed for it to show up to 10 % (+ an additional 4 km/h) too much so that in the worst case you're never
driving too fast. So "correcting" it down might actually be illegal if you overdo it as tire pressure on warmer/colder days can invalidate your measurement.
My car can supposedly only do 183 km/h, but I easily got it to "200" ;-)
Do you intentionally sabotage/alter your car so you can make these tutorials? Because they're really good.
Khaled Hossam nah he bought that S2K used with the intention of fixing all the little things on it to show us how to he. the reason it was off was because he changed his Differential
Khaled Hossam Having a different sized wheels alters the speedometer. That was the case in my car, a Lumina SS if you're from the Middle East.
Damage42X you won't have to worry about your Lumina SS for too much longer. Holden cease production this year, so you won't be able to replace it. And being a Holden it will soon fall apart.
Damage42X cool, never heard of that car. Never seen it before either.
+75mattyd I think it'll get me going for about 5 more years or so. It's an LS1 engine so I can find numerous parts for it.
Hello. You will have problems with molex conector after few rainy daiys. Its just not made for out door use.
Try to seal the conector and protect it from water, watter salt etc.
usually you can also code in a correction factor into one of the ECUs as well. If you can get a OBD interface and the software that is.
Hi Jason, Thank you for sharing these information with us. I have a question about using Ethanol instead of Gas to run the car engine. When it is safe to use it? is it true it gives the car more torque only if it is equipped with a turbo? .... thank you.
Chris Fix sure sounds a lot like engineering explained here.....
Dan Sasala
That would be incorrect.
Dan Sasala Chris Fix would have laid out tools, and routed his yellow box somewhere completely hidden and safe from everything, and at the end of the video admire his work like a man. Haha
That's all well and good, however bear in mind that virtually all speedometers have a built-in deviation. In my car I can read out the speed via OBD-II and it will match up exactly with the GPS (+/- 1 km/h). However the actual display is always reading 10% higher. If I were to fit a yellow box in my car to fix the speedo's deviation, I'd be throwing off the ECU, speed-dependent power steering and most importantly the mileage by 10%. That would for example make me about 13k km / 8k mi late for my timing belt service interval.
So personally I'd set this yellow box to only compensate for what's changed (gearing or tire circumference), maintaining the factory default deviation on the speedometer.
Simple and effective. Thanks!
simpler than I was expecting. I've considered the idea of getting larger diameter tires, for better ground clearance and for reduced highway RPM so this could make that an option
What to do when a speedometer shows different misreadings depanding on speed? I.e. When I drive 50 km/h according to GPS, my speedometer shows around 56-57km/h, and this 5-7km/h stays the same from 30 to 140km/h, when I reach 160km/h, the measurement is spot on with GPS - straight up to 220km/h(max speed).
I never knew such a thing existed. Great info!
Sounds bueno, I was thinking about changing the gearing on my cbr600rr for more torque (probably not for a while though)
thanks for the video man, but can u show us how to correct an analog speedometer ?
cool tutorial man never knew how to do that, nice s2000 by the way
dont do it bro. adds weight bro. racecar bro. bro.
not sure if mentioned in comments already....
a lot of modern cars don't have gearbox speed sensors. they get the speed info off the abs sensors. some use the gearbox speed sensor as a back up should the abs system fail.
something to check before fitting any adjustment box.
Did you check the speed at the PCM? Sometimes the clusters are programmed to show the speed a bit fast, as is the case on my Golf. The PCM sees the speed exactly correct, yet my speedo reads about 3-5 km/h fast. Also, usually using some software, you should be able to change it in the cluster without a hacky piece of hardware in-between.
A post on Tuesday! It must be Christmas!!!!!!!!!!!!
Thanks, very cool. How times have you filmed yourself doing something, just to finish the project and it not turn out like intended, hence pretty much ruining the aspect of the video. Ever have that happen?
Can you make a video explaining how pneumatic gearboxes work and why they are so expensive?
Jason, do you think you can make an engine knock? I can't find any video where I'm absolutely certain that the noise shown is indeed knock.
What I fixed and believed to be knock was almost certainly caused by the lifters.
Some makes and models don't need a middleman device, with those it's possible to flash that adjustment factor to the ECU. I'm surprised Honda didn't have such a setup with this car.
I thought all cars over-read from the factory intentionally?
They do! In older cars it can be up to 10%. My unmodified VW golf mk6 overreads about 5-6%.
@Julian Schmidt I have a mk5 jetta that seems to be the same way lol. Just need to find someone with a VCDS....................
Tom Smith they do.
The factory don't want to be responsible for speeding fines.
factory does that for a number of reasons: it does give to the driver one unrealistic "feel" that the car is faster, acelleration is better because it hit the target early and also the fuel economy seems to be higher as you cover extra miles for your gallon, legally they can be up to 10 % off to up but not for down, so they do that to be in the safe side
They do. People need to take care when adjusting speedometer readings because the odometer will then be wrong.
wow, didn't know you had a second life as Chris fix lol
Awesome video
Reflection in iPhone is awesome, Jason! :-D
This is gotta be one handy dandy little yellow box. This will be perfect for when I get bigger tired and lift my xB.
1:27 I was like "what?? I didn't put anything in the microwave!"
And yea I'd be comfortable with the setting reading a little higher than I was going. Learned that from experience.
"It must be the larger diameter tires I put on my car, officer!" is apparently no longer an acceptable excuse. :-)
I've always wondered which is more accurate. I have an old school style needle speedometer and it seems to read 2 or 3 mph slower than what my phone app says and I don't know which one is more correct
I'm honestly surprised there isn't like a dial you could access by perhaps removing the speedo and turning it to the correct position or something. Seems way more intuitive than spending close to 100$ for a device to do it for you in a couple minutes and then that you'll probably never need again for the rest of your life...
will that work if you're speedometer is where if the needle is reading 60mph but you're really going slower
Is your sensor driven off of a gear? In the case of my Jeep, I just had to switch out the gear size for about $10.
Just love it!
How to do a burn out.
Now I need tires.
How to buy tires.
Now I need a differential..
How to do a differential.
Now I need to correct the speedo.
How to correct the speedo.
Now I need to correct my check light.
Now I need to help my wife understand the craziness.
Now I need a new life.
.....Keep the videos coming, I can't wait to see the end.
Now I'll pull a 40,000 pound trailer with my S2000....
Curious how this impacts the odometer. I'm always paranoid that with my car's speedometer reading high that the odometer is reading artificially high too. Makes a big difference for somebody leasing that needs to stick to a mileage cap.
That concern was popping up in my mind as well. I personally don't mind the odometer going up faster, but maybe the government sees it as tampering if they find out during the yearly checkup. If someone sets the correction to 1% then the odo meter wouldn't turn anymore (Extreme example).
A Bluetooth OBDII module + app will let you log the car's speedometer + GPS speed for download/comparison.
Related - what options do you see that exist to simply adjust the speedometer via the OBDII connector/the car's own computer?
Fixed it on my car. 120 kph on the speedo is now 120 kph on the gps. So awesome
Have you tried multiple speedometer apps, and if so, which one do you prefer?
Isn't there a way to do it through a tuning device? It had to do with finding the diameter of your... drive wheels? Idk, something like that, and programing it into a tuner of some sort and it'll do its thing through the OBD II port. Is this to fine tune it?
so does this mean when I put it to 200% then the speedometer shows only half of the speed. like 50kmh instead of 100kmh. And does this mean the km only counts half? So when I travel 100km my car shows 50km?
Hunter178 thus saving fuel?! 😂
Hunter178 thus being able to sell the car with less distance on the odometer.
Yes and no. your speedo will read your modification correctly, but depending on the make and age of the car, the odometer will likely record distance separately so as to prevent scamming the ownership and usage history.
LoL you should came to Poland. In Germany 5 year old BMW would have 150 000 km, but when the same BMW will ride (on tow truck) to Poland then the mileage will 'magically' drop to 40 000 km. We have 17 year old vehicles imported from Germany with the course of 150 000 - 200 000 km :D
does this mean that if you fit a different ratio differential and adjust the speed this way, since the ecu gets a separate reading the ecu will still be getting the incorrect speed for the odometer and you end up with 7% higher indicated mileage? :o
Actually, I have a different problem: My speedometer seems to be bang on up until about 70 kph, but starts to deviate if I exceed that, until it displays 160 kph but my GPS says 150. So it's not just a relative error, or else I would see about 5 kph difference at 70, not the exact match I'm actually seeing. Tips?
Is the GPS the most accurate form, should I believe what that says over what my dashboard says, at all times (except in tunnels)?
I am so glad my E39 525d with high-OBD has these secret functions for all kinds of stuff, one of them is digital speed read-out, both for the speedometer and GPS speed. I don't know how it does that, but it's correct with a GPS speed next to it. Perhaps showing 1 KM more than actual GPS speed, but I am okay with that.
It costs a few seconds to get into this hidden menu, but at least it's free.
Could one also be able to change something with a special software on a computer attached to the car's OBD port without the use of this yellowbox?
Does this correct the overall odometer reading as well?
On VW cars you can adjust the speedo just with the VCDS interface, its not possible to do this on an S2000 ?
i have a quick little question. if you were to change the differential on an all wheel drive to a bigger final drive gear, would you have to replace both or just the one??? saw the question on a forum but didn't see an answer and i was wondering the same.
How much adjustment do you think you could do before the ECU (which I assume is using speed as an input) goes into limp mode ? What would happen if you corrected by 99% so your car only records 1 mile on the odometer per 100 travelled ?
Depends on the specific car make and model i guess. Every car manufacturer will have their own thoughts on when to consider data faulty.
Good thing that you are driving a manual, because if it was an Automatic the ECU uses the Speed sensor to measure transmission slip, and this has a high possibility of throwing a code
The better way of doing this is by changing the programming in the ECU. For example, if you had something like a "HP tuner" you can change the programming of the ECU to set the speedometer. HP Tuner only works on Domestics I think
What was the GPS app you used?
in the first place, to even see how my spedo counts it.
And is there any web site that count speed difference by sizes of weels (I drive '99 Civic, with 165/65/14 winter and 195/50/15 summer tyres, and hignt is 1.6cm different!)
I drive a 1982 Mercedes 240D, I changed out the gearing in the rear end, but cars from this time frame were all mechanical speedo's, any thoughts ? As I'm ready to high as well, thanks for all the great videos you do, M
Talk to your Mercedes Dealership Service Mgr.
How to remove speed limiter on Mercedes Benz Actros 2640 6x2 hook lift?
My check engine light will triggers every time I hit a certain speed at certain RPM, mostly around 3000RPM or 120km/h. The error code says that the speed and RPM readings are out of range and not plausible. I'm guessing that using a slightly smaller tire is the cause. Will try changing back to bigger tires to see if it fixes the problem.
Jason, can you do a whiteboard explanation on this?
Like the video but at the $100 price point it's pretty close to what the dealership charges to calibrate your speedo as well and flashing it is a better solution than having another piece connected.
All I did was match my cars speed with another car that has a reliable speedometer, then I used sharpie to write in new guidelines for the velocity on the faulty speedometer :D
Hi, I think my problem is a bit different. When I connect with my OBD-2 reader in my 2008 Ford BF the speed is accurate, but my dial is still ~5 kmh over
is there any way to do this if your car has a mechanical speedo drive
I have the VW UPTSI 2016, and I need to correct the speedometer due the new tires. Does yellow box work with this car? In my case, the source of signal is on gearbox too or the UPTSI use signal from wheels (ABS sensor)? Will I have any problem with connector or the yellow Box matches with VW UPTSI ?
Could you do a tutorial on how to pull the perfect "Hello everyone aaand welcome"?
can you compare the vbox to a built in phone gps? how much off is it? should be pretty accurate for constant speeds even at 5hz.
my golf read about 8% high at 100 km/h. but from the little research I did, I think it gets its speed measurement from the ABS sensor. so I don't think this would work for me.
thanks, this is super helpful
What about old cars with manual things like speedometer cable?
Hi Jason, as you mentioned, the speedo can read incorrectly when different tyres or wheel sizes are used, instead of the original measures. This leads to my question, if my Wheel size is 17R205/45, and proceed to change the tyres to 17R205/50, what will happen? I get that the top speed will go up because it is like putting a higher gearing and that the speedo will read slower by about 5% if I'm not mistaken, but what about accelaration? Will it be faster, slower, and will it be because the tyre is heavier or is here anything more at play? Thanks and great work!
This website will accurately (assuming you know your actual speedometer reading) measure the speed differential when changed your tires and wheels setup:
www.willtheyfit.com/
Using the info you gave me and the website, your vehicle speed reading will be lower with the 50 sidewall by -3.22%.
Yeah I usually use tiresize.com/tyre-size-calculator/ for that, but what I want to know is the actual acceleration 0-100Km/h (the topspeed I can calculate myself I think)
Hmm, I don't know about that, but you can check out this other cool website that has similar info to what you're looking for:
www.enormouslysideways.net/calc.html
You need to know your transmission setup. Check out the gear ratios for you're specific vehicle.
What about a GPS analog powered speedometer that you put over your current speedometer.
Where did this version of the yellow box come from? On their website they only show a v3 and v4 version that both have dip switches for setting the correction factor. *edit* nevermind I see the v5 version on the purchase page. They need to update that website with the documentation and pics of the v5 version!
What about for speedometers that lag? So like from 0-60 my speedometer doesn't move from zero till I'm actually at like 5-10 mph
Is there anyway to adjust an analogue speedo like the ones in an early model Miata/Mx5?
my grand prix's analogue needle gauge is usually 2- 3 mph less than the digital read out on my HUD... which is more likely to be correct?
Any fix for old cable-driven speedo?
I have 2017 2.2 ford ranger wildtrak. I changed my stoch tires 165/65 r18 to 175/55 r20. How will i know the difference percentage of actual speed? And how can i adjust it?
this maybe my lucky day ? i have a VDO electronic speedometer with a hall effect sensor on a vw buggy, this is my second one from VDO , what happens very shortly or about 20k miles of use the pointer becomes eratic and does not stay on a even speed driving me nuts. i know ii need to check the inside of the hall effect but why are they f ailing so quick ? they are not cheap to buy at all . I wonder how much help ill get from vdo or international comp ? thanks for your vid nice
So when you use this does it automatically set the correct rpm with the speed?
Yeah, mine truck is not off by a percentage, it is off by 15 mph at 35, 55, and 75, so I don't know what is up with it, at really low speeds it's correct, but at around 20 it shoots up. It does have an injector out, so it's only got 7 cylinders at the moment.
Such simple kits doe not help in the non-linear misreadings which are in many GM cars.
And you may adjust the linear misreading by the OBD interface. it's something like "tire diametre" with several digits.
But then you still have the "2nd offset" kicking in at about 40mph, and then the 2nd additional factor kicking in at about 70mh, redering everything before completly useless.
I had the 30mph "spot on", but on 130mph was still reading 155... FSCK!
May i ask what app are you using on your phone that acts as a speedometer? Thank you.
its ~$120 for the yellow box, about ~$500 for the whole kit. lmfao, yeah no thanks.
The VBOX isn't really made for this kind of thing, but it's super accurate which is why I used it. You just need to be able to know your actual speed. Could use your phone just as easily.
Engineering Explained what is it made for then?
what "kit"? It's $93 for the splice harness, and $110 for the plug n play harness version.
The VBOX with GPS antenna. Try clicking on both links next time.
I had already looked at both products. They're separate products, each being used independently of the other. Even though the VBOX is probably what's being used to check speed via GPS, I'm sure there are phone apps that will do the same thing using the phone's own GPS antenna.
Honestly with all the tech inside phones today, I don't know why the VBOX unit is even needed.
Thank you, Fix It Felix!!
Why did you say that changing the final drive ratio (rear differential) is the result of the over reading speedo?
You. Are.. Awesome... Thanks for making!
I changed my car's tire from 205 65 R15 to 215 60 R17 and obviously there is a speedometer error of around 6%, I'm wondering if this 6 percent difference affects my odometer reading? If so, is it okay to use the speedometer calculator online to check the actual mileage of my car?
I Got the RKV 125 C version of this bike .. everything about the bike is fantastic except the speedo faster you go the less acurate it is start at around 1mph out but at 40 the speedo reads 45 and at around 62mph it says 71 mph .
Mine reads double in an E53 X5... it’s putting double the miles on it too
Question If you have a car with this problem when you are driving with over speed it means the car mileage get higher faster? I have a Toyota sienna and just drive locally and in in ten years the miles are over 200K
what if my car uses a magnetic speed sensor? i think the yellow box only works with hall effect sensors