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I am Anthony with 9XX Research, and we specialize in uncharted territories. If many others have tried and cannot complete something perfectly, we will finish the job. This time around, we are introducing:
Matrix LED Full Activation for 992, 718, Cayenne, Macan, Panamera $700
Matrix LED Full Activation for 992, 718, Cayenne, Macan, Panamera $500 for first 5 from Rennlist
Taycan $900 (coming in September)
Free gift for all: Comfort windows and sunroof w/Matrix LED activation
Recoding (if needed after a dealer visit) $200 for all models
9XX Research is an Official Porsche Partner, ID# DDA2197. We strictly follow Porsche protocol on equipment standards, and therefore no remote sessions will be offered for Matrix LED Activation. We will visit you during our USA touring schedule, and we are fully equipped to recover your car from damaged codes done by others.
Recovery of full function $2000
Required if erroneously programmed by a non-Porsche partner prior.
(e.g., Homelink damage by erroneous Matrix LED coding by third party other than 9XX or Porsche Service Center)
What do you know. The speed calibration is different between US and Canadian cars. I checked two Canadian cars and they have the same as yours. Then I checked mine and a GT4 and they show 100%. That is the best way to avoid a ticket in Canada
Finally got around to calibrating my speedo. Turns out the inaccuracy was not linear, that is to say it was less accurate at lower speeds. I only needed to change the value of Y1 from 100% to 97% to make my speedo match the GPS speeds of WAZE and the SPEED App on my phone. My speedo now also matches the radar signs posted along the roadside in my area.
Finally got around to calibrating my speedo. Turns out the inaccuracy was not linear, that is to say it was less accurate at lower speeds. I only needed to change the value of Y1 from 100% to 97% to make my speedo match the GPS speeds of WAZE and the SPEED App on my phone. My speedo now also matches the radar signs posted along the roadside in my area.
So I would have thought that 100% was to give a true reading and 97% was to alter it... But you say it match's the radar sign speed better now? Are we sure those signs are calibrated, and just how accurate is GPS speed?
So I would have thought that 100% was to give a true reading and 97% was to alter it... But you say it match's the radar sign speed better now? Are we sure those signs are calibrated, and just how accurate is GPS speed?
Since the GPS speed and the radar signs tend to agree I guess I have a greater confidence in their accuracy than my car's speedo. Yes 97% alters the speedo readout. At slower speeds my speedo would read 2-4 kph high. After experimenting changing Y1 to 97% pretty much eliminates the deviation and tilts the correction from 0 (Y1) to 250 (Y2). I'm not too concerned about Y3 400kph since I don't have a Bugatti Chiron. lol!
Since the GPS speed and the radar signs tend to agree I guess I have a greater confidence in their accuracy than my car's speedo. Yes 97% alters the speedo readout. At slower speeds my speedo would read 2-4 kph high. After experimenting changing Y1 to 97% pretty much eliminates the deviation and tilts the correction from 0 (Y1) to 250 (Y2). I'm not too concerned about Y3 400kph since I don't have a Bugatti Chiron. lol!
Interesting so the 'X' values would appear to be the speed around which the correction 'Y' takes place, So if there was an error at a particular speed 'X' you could compensate by adjusting the 'Y' factor. Cool!
Interesting so the 'X' values would appear to be the speed around which the correction 'Y' takes place, So if there was an error at a particular speed 'X' you could compensate by adjusting the 'Y' factor. Cool!
similar to coolant temperature gauge calibration. where x = coolant temp and y = temp displayed in cluster.
I've tested the fix in PIWIS to adjust for smaller tire sizes (I'm using a 265/35/19 and 305/30/19). To get the correct value I plugged in a 25Hz GPS, ODBII speed reader and set the cruise control to 30mph. Higher speeds would probably be more accurate but there is traffic on the freeway right now.
When at 30mph per cruise control, I observed the speed logged by the GPS and by the ODBII monitor. In this case, they were 28.3 and 28.6 respectively.
I wasn't sure how the "Kennlinie Geschwindigkeitskorrektur: Korrektufaktor Yx" multiplier worked, so I tried 106% initially but that made my speedo faster. (hit 20mph pulling out the driveway) so used 94.33% (28.3mph / 30mph = 0.9433) which resulted in a almost aligned GPS/ODBII/Speedometer reading.
In PIWIS the values you want to change are "Kennlinie Geschwindigkeitskorrektur: Korrektufaktor Yx". I don't know if you have to change Y1, 2 and 3, I tried all 3 and things seem to be fine now but I may update if I run into problems.
*and now I see Socal was just posting about this. I confirm his findings.
06-10-2023, 12:35 PM
