mlue1
New Member
Posts: 5 
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Post by mlue1 on May 27, 2017 23:20:09 GMT
My Golf speedometer is optimistic by a whopping 10km/h (over 6mph). When I'm actually going 120 km/h the speedometer will read 130 km/h. I read in the write up below, where you can use Ross Tech Vag.Com to select the Dashboard Module and use Long Coding to change Distance Impulse number using bits 0-3 in Block 271F00. See the link below. www.myturbodiesel.com/wiki/speedometer-fast-error-adjustment-and-correction-mk5-mk6/I'm unable to do this, was hoping that someone has done this in OBD11.  |
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mlue1
New Member
Posts: 5
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Post by mlue1 on May 30, 2017 13:35:25 GMT
No one ? Bloody Hell! 
They should add this to the Apps for all the cars. |
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mlue1
New Member
Posts: 5
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Post by mlue1 on Jun 13, 2017 13:11:25 GMT
My Golf speedometer is optimistic by a whopping 10km/h (over 6mph). When I'm actually going 120 km/h the speedometer will read 130 km/h. I read in the write up below, where you can use Ross Tech Vag.Com to select the Dashboard Module and use Long Coding to change Distance Impulse number using bits 0-3 in Block 271F00. See the link below. www.myturbodiesel.com/wiki/speedometer-fast-error-adjustment-and-correction-mk5-mk6/I'm unable to do this, was hoping that someone has done this in OBD11. I've being reading the Ross-Tech screen wrong(see below). I was trying to go to Byte 27 that's incorrect.
Long Coding - Byte 0 - Change Bits 0-3 (supposed to use a combination of Bits 0-3 to get the desired correction).
I have confirmed that I could change Bits 0-2 to get some correction for a pessimistic speedo but unfortunately on my car I am unable to change Bit 3(get a warning).
[img src="http://thumb.ibb.co/kuxidQ/Capture.jpg"]
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danm
Junior Member
Posts: 75
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Post by danm on Jul 13, 2020 23:25:54 GMT
I'm guessing that you are running the dealer wheels. 15inch with 195 55 15 tires. The law says the speedo MUST be accurate from 0 to +10/100. It must never under report. The factories want to sell the larger rim tire options. So they set the calculation for speed to the largest circumference that will fit . The speed is taken from the abs wheel pulsations.
The car doesn't know you have the little wheels . Result is that those little wheels spin fast and your speedo is over reporting.
Note that the distance is also over reporting. Your reported gas milage will appear go down, just by putting large circumference wheel/tires on the car.
Hey, you didn't really thing you were getting BETTER gas milage than advertised did you.
Just put a nice set of 18 inch rims/tires on the car . Give it a week for the computers to get used to how the new driver responses are ...AND YOUR ALL SET TO ROCK
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Post by Matthew on Jul 15, 2020 18:56:36 GMT
When I'm actually going 120 km/h the speedometer will read 130 km/h. This is intentional by design (not just to avoid speeding tickets). What method did you use to measure your TRUE speed? Have you changed from the factory tire combination? What size tyre do you have currently? What is the instrument cluster part number you have currently? You need to post the specifics so that we can help you. Your coding changes are going to be found in Byte 00. I'll look at what it is set for my car. |
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