Indicated Speed

DAPK · 07-22-2012, 07:51 AM

Guys and girls, I am wondering if anyone has access to a LIDAR unit? I am thinking that my speedo is reading at about 5k's below indicated, so 120kph is actually 115ks, just wondering if anyone has one, or knows where I can rent/buy one? I also fly model aircraft so wanting to get one to measure model aircraft speed runs too. Happy for you to PM me if you like.

DJDeez · 07-22-2012, 11:30 AM

The German traffic regulations (StVZO) states that the actual speed may not lie below the really driven ones. The actual speed may exceed real driven speed, however, only by max. 10% + 4 km/h above (§57 paragraph 2 StVZO, 75 / 443 / European Economic Community, ECE-R39). The speedometer may never register less then allowed speed limits.

Oxymoron · 07-26-2012, 01:55 AM

According to a QLD police Radar gun. My M3 is traveling at 136km/h when cruise control is set to 140.

Don't ask how I know this.

In general. All car speedos read a couple % higher than your actual speed.

fontana302 · 07-26-2012, 05:48 AM

You can code the digital speed to read true speed by changing BC_DIGITAL_V_KORREKTUR to “nicht_aktiv” in KOMBI ecu. That way you can see the difference exactly. Both Analog & digital read high when compared to true speed unless coded.

Alpine* · 07-31-2012, 09:17 PM

Dane, get a decent Avatar image will ya, c'mon I know who you work for and that doesn't look good

07-22-2012, 07:51 AM	#1
DAPK New Member 7 Rep 10 Posts Drives: M3 Coupe - Burnt Orange - DCT Join Date: Jul 2010 Location: Canberra iTrader: (0)	Indicated Speed Guys and girls, I am wondering if anyone has access to a LIDAR unit? I am thinking that my speedo is reading at about 5k's below indicated, so 120kph is actually 115ks, just wondering if anyone has one, or knows where I can rent/buy one? I also fly model aircraft so wanting to get one to measure model aircraft speed runs too. Happy for you to PM me if you like.
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07-22-2012, 11:30 AM	#2
DJDeez Got my license back! 14 Rep 205 Posts Drives: TransLink Join Date: Jul 2011 Location: YVR iTrader: (2)	Why does the actual speed differ from the speed shown on your cars speedometer? The German traffic regulations (StVZO) states that the actual speed may not lie below the really driven ones. The actual speed may exceed real driven speed, however, only by max. 10% + 4 km/h above (§57 paragraph 2 StVZO, 75 / 443 / European Economic Community, ECE-R39). The speedometer may never register less then allowed speed limits. __________________ aFe cold air intake system (stage 2) ▫ Agency Power cat delete/section 2 midpipes ▫ Agency Power exhaust system ▫ Beltronics STiR Plus ▫ BMW M style (ZHP) weighted short shift knob ▫ CIC iDrive ▫ Clutch pedal spring removal ▫ Coding ▫ Evolve-R tune ▫ Laser Interceptor ▫ LUX H8 V3 Angel Eyes ▫ pickyeater334 clutch stop ▫ Rear fog lights (2011 light control switch assembly) ▫ T3 Alpha laser gun protection ▫ Turner Motorsport power pulley kit
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07-26-2012, 01:55 AM	#3
Oxymoron Private First Class 88 Rep 196 Posts Drives: 2018 M2 LCI MGM Join Date: Dec 2009 Location: Brisbane Australia iTrader: (0)	According to a QLD police Radar gun. My M3 is traveling at 136km/h when cruise control is set to 140. Don't ask how I know this. In general. All car speedos read a couple % higher than your actual speed.
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07-26-2012, 05:48 AM	#4
fontana302 Private First Class 6 Rep 105 Posts Drives: 2012 E90 M3 Join Date: Aug 2007 Location: Brisbane, Australia iTrader: (0)	You can code the digital speed to read true speed by changing BC_DIGITAL_V_KORREKTUR to “nicht_aktiv” in KOMBI ecu. That way you can see the difference exactly. Both Analog & digital read high when compared to true speed unless coded.
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07-31-2012, 09:17 PM	#5
Alpine* Brigadier General 1281 Rep 4,093 Posts Drives: M2 G87 Join Date: May 2008 Location: Australia iTrader: (0)	Dane, get a decent Avatar image will ya, c'mon I know who you work for and that doesn't look good
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