[CommitConfirm]

Lol. P3 gauge is just a OBD reader....

[Wharf Rat]

Originally Posted by CommitConfirm

This is very real and can be coded on or off. It's very useful for the old speed cameras & average speed traps here in Europe.

For example both my R55 and R56 MINIs have this enabled by default. When the speedo reads 55mph you're really closer to 50.

However with this disabled on the M2 50mph is as near as dammit 50.

Look up 'BC_V_KORREKTUR' & 'BC_DIGITAL_V_KORREKTUR' on the KOMBI module

Just not understanding the usefulness of a speedo that reads slightly lower than actual on purpose. Especially if one has to code in this bit of uselessness.

I'm a grown man. I can read both my speedometer & traffic signs. I'll choose how I drive. If I get caught exceeding the limit - it may have happened before - I'll accept responsibility for my actions. Bottom line: I would like my car's gauges to be accurate.

Now, if you could code what the speed cameras & radar/lidar guns received as my speed I'd be all over that.

[Hasan Shaikh]

There are some regions that actually get 100% accurate speedometers.

[CommitConfirm]

No. The speedo reads slights faster.

When it says 30 your doing closet to 28. When it says 55 you're closer to 50mph.

[Wharf Rat]

Originally Posted by CommitConfirm

No. The speedo reads slights faster.

When it says 30 your doing closet to 28. When it says 55 you're closer to 50mph.

We'll see, I guess. I've used portable GPS units to check previous cars & motorcycles speeds... I'll check my M2 once it gets here.

Anyway, displaying 'close to 28' instead of 30 isn't likely going to make a difference with a trooper, given the speed at which one may be in peril of getting pulled over. Doing 85 instead of 88 in a 65 zone probably gets you the same ticket.

[TomAce]

Originally Posted by CommitConfirm

No. The speedo reads slights faster.

When it says 30 your doing closet to 28. When it says 55 you're closer to 50mph.

Well, I tried it on the Autobahn and my M2 runs into the limiter at 266-267kph (about 165mph), GPS said 264kph. Without driver's package.

Speedo from the M2 is the most accurate I ever had. It only reads a little faster actually, 2-3kph in any speed range.

[David1]

Originally Posted by CommitConfirm

Lol. P3 gauge is just a OBD reader....

But it is mapped to true road speed and GPS verified. Much easier than coding.

[cookiesowns]

Originally Posted by David1

But it is mapped to true road speed and GPS verified. Much easier than coding.

Unless you’re telling me the P3 has its own GPS... it’s hard to say which can PId’s it’s reading for gps.

That said the speedo is fairly accurate for me on my car when cross referencing with my Max 360. I’ll verify with my aim solo DL which has a more accurate GPS when I have some more time

[David1]

Originally Posted by cookiesowns

Unless you’re telling me the P3 has its own GPS... it’s hard to say which can PId’s it’s reading for gps.

That said the speedo is fairly accurate for me on my car when cross referencing with my Max 360. I’ll verify with my aim solo DL which has a more accurate GPS when I have some more time

The P3 is reading true road speed through the OBD port. I have checked it with GPS and I am fully confident in its speed setting. I have been using P3 since 07 in many BMWs.

[CommitConfirm]

Originally Posted by TomAce

Well, I tried it on the Autobahn and my M2 runs into the limiter at 266-267kph (about 165mph), GPS said 264kph. Without driver's package.

Speedo from the M2 is the most accurate I ever had. It only reads a little faster actually, 2-3kph in any speed range.

Exactly my point. This feature is turned on on some cars but is off on the M2.

This all started because someone doubted my V max of 165. Hey claimed it was inaccurate and the car lied to me. My point was the M2 is as accurate as any car.

I've VBOX'd my car. If you think they are wrong then so will a lot of professional race teams.

[TT1351]

I think the built in discrepancy is like a DOT thing for the US. This has been the way its been for years, including motorcycles. It allows you to think you getting away with something, but it does offer a slight buffer. When you have a chance go by a stationary radar that some places place on the side of the road, or permanently installed near schools, when your speed is reading 30 the display on the unit will show a speed less than that. Sure different sized tires will affect the speedometer reading, but that too is a double edged sword, it can work against you by showing a lower speed than you are actually going. I'm sure an internet search can shed more light on this. Just my 2 cents worth.

[TT1351]

For example, read this https://beta.theglobeandmail.com/glo...beandmail.com&

[Artemis]

Originally Posted by David1

Or just get the P3 Vent Gauge and it will show true road speed.

Originally Posted by CommitConfirm

Lol. P3 gauge is just a OBD reader....

Originally Posted by David1

But it is mapped to true road speed and GPS verified. Much easier than coding.

Originally Posted by David1

The P3 is reading true road speed through the OBD port. I have checked it with GPS and I am fully confident in its speed setting. I have been using P3 since 07 in many BMWs.

During a spirited drive on the Autobahn the speedometer needle will keep moving towards ± 280 km/h (± 174 mph).

The P3 Multi-Gauge pulls data straight from the ECU: it reports the exact values logged by the ECU. Actual road speed value on the basis of the wheel/vehicle speed sensor (VSS), uncorrected (raw value), taken from the left rear wheel.

My car features the 'M Driver's Package' (unrestricted V-max). Strange enough, the speed indicated on my P3 gauge and the speed indicated on the OBC are as good as identical.

Furthermore, my P3 gauge stops at 266 km/h (always 'stalls': keeps showing that speed - never 267 km/h), likely because the device is limited to 165 mph, while the car continues to accelerate (speed needle, rev needle and OBC speed keep going). Didn't push it yet to find out when then car fully runs out of breath. Highest value seen so far indicated by OBC was 275 km/h (171 mph).

Also, you never know whether the road is perfectly flat. Needless to say that you can achieve a higher speed on downhill straights.

[gtaM2]

i have noticed on all my cars that the real speed is less than the cars speedometer reading... without doing any research or caring all that much i just assumed it was each manufacturers way of having your warranty run out quicker

[look585]

As long as the odometer is not reading fast.

[Aronis]

Simply drive past three or four mile markers at 60 mph (or what ever steady speed), time it, and do the math, calibrate your speedometer.

Mike