Speedometer recalibration

Guyfromthere · 07-12-2016, 01:59 PM

Hey guys! Is it possible to DIY speedometer recalibration somehow? Mine is showing ~9% more speed than all of my gps devices.

cooltoy · 07-12-2016, 02:18 PM

Do you have aftermarket wheels?

Guyfromthere · 07-13-2016, 04:36 PM

I have stock 18s, i bought car 2nd hand ant it looks like it was originally sport package. Might have been with 19s from factory

jchammond · 07-13-2016, 04:48 PM

What size tires are on it?

cooltoy · 07-13-2016, 05:05 PM

We are trying to see whether it is the wheels throwing your speedo off.

Guyfromthere · 07-13-2016, 05:45 PM

stock 18 wheels 225/50/18 front 245/45/18 rear advan sports

BGTV8 · 07-13-2016, 06:07 PM

My speeedo has been 9% off since I purchased the car in 2009.

I have a $45 GPS speedo that projects onto the windscreen, runs off a mini USB charger.

Nissan is deliberately conservative with speed calibration and calibration is not owner modifiable that I have been able to discover

cooltoy · 07-13-2016, 07:54 PM

Ya, I use my Passport 9500ix if I want to know true speed.

cooltoy · 07-13-2016, 07:56 PM

Quote:

Originally Posted by Guyfromthere

stock 18 wheels 225/50/18 front 245/45/18 rear advan sports

Those are stock numbers, so it's not the wheels.

jchammond · 07-13-2016, 07:58 PM

Mine has 26.6" diameter tires on rear & is slow about 3%,,, a 27" would put it on spot (27.2"-like a 345/30/19MPSS)

Rusty · 07-13-2016, 10:38 PM

Quote:

Originally Posted by jchammond

Mine has 26.6" diameter tires on rear & is slow about 3%,,, a 27" would put it on spot (27.2"-like a 345/30/19MPSS)

Guyfromthere · 07-15-2016, 05:34 AM

Ye i use waze and yav1 on 2 phones and both show that im going slower

Mothra108 · 09-22-2024, 11:20 AM

Quote:

Originally Posted by Guyfromthere

Hey guys! Is it possible to DIY speedometer recalibration somehow? Mine is showing ~9% more speed than all of my gps devices.

This is typical of what car manufacturers do, supposedly to 'protect' you from inadvertently speeding. I believe that they're allowed to go as high as 10%, for the indicated speed to be above the actual speed. Maybe I'm weird but I'd rather the speedometer be accurate and I make the choice as to how fast I'm going, don't need a car nanny to protect me from myself.

cooltoy · 09-22-2024, 12:33 PM

Good point, but OP has not been here since 2017. He does not care anymore about an eight year old thread.

Rusty · 09-22-2024, 12:47 PM

Like digging. I have a job opening.

07-12-2016, 01:59 PM	#1 (permalink)
Guyfromthere Base Member Join Date: Jun 2016 Location: latvia Posts: 90 Drives: 370z 2012 mt Rep Power: 9	Speedometer recalibration Hey guys! Is it possible to DIY speedometer recalibration somehow? Mine is showing ~9% more speed than all of my gps devices.

07-12-2016, 02:18 PM	#2 (permalink)
cooltoy Elite Member Join Date: Jun 2012 Location: Calgary Posts: 13,978 Drives: 14 PW 370Z S/T MT Rep Power: 243722	Do you have aftermarket wheels? __________________ Member of kenchan's "photoshopped mods" and "proper offsets" gang.

07-13-2016, 04:48 PM	#4 (permalink)
jchammond A True Z Fanatic Join Date: Nov 2014 Location: South Carolina Age: 58 Posts: 15,204 Drives: 13’ 370Z TS 7A/T Rep Power: 2684395	What size tires are on it? __________________ MazWorx built long block \| FI-TT-100 Stage 2.75 \| IPT built 7A/T http://www.the370z.com/members-370z-...s-musings.html

07-13-2016, 05:05 PM	#5 (permalink)
cooltoy Elite Member Join Date: Jun 2012 Location: Calgary Posts: 13,978 Drives: 14 PW 370Z S/T MT Rep Power: 243722	We are trying to see whether it is the wheels throwing your speedo off. __________________ Member of kenchan's "photoshopped mods" and "proper offsets" gang.

07-13-2016, 07:54 PM	#8 (permalink)
cooltoy Elite Member Join Date: Jun 2012 Location: Calgary Posts: 13,978 Drives: 14 PW 370Z S/T MT Rep Power: 243722	Ya, I use my Passport 9500ix if I want to know true speed. __________________ Member of kenchan's "photoshopped mods" and "proper offsets" gang.

07-13-2016, 04:36 PM	#3 (permalink)
Guyfromthere Base Member Join Date: Jun 2016 Location: latvia Posts: 90 Drives: 370z 2012 mt Rep Power: 9	I have stock 18s, i bought car 2nd hand ant it looks like it was originally sport package. Might have been with 19s from factory

07-13-2016, 05:45 PM	#6 (permalink)
Guyfromthere Base Member Join Date: Jun 2016 Location: latvia Posts: 90 Drives: 370z 2012 mt Rep Power: 9	stock 18 wheels 225/50/18 front 245/45/18 rear advan sports

07-13-2016, 06:07 PM	#7 (permalink)
BGTV8 A True Z Fanatic Join Date: Dec 2009 Location: 03350 Australia Posts: 1,515 Drives: 09 Nissan 370Z M6 Rep Power: 39974	My speeedo has been 9% off since I purchased the car in 2009. I have a $45 GPS speedo that projects onto the windscreen, runs off a mini USB charger. Nissan is deliberately conservative with speed calibration and calibration is not owner modifiable that I have been able to discover

07-13-2016, 07:58 PM	#10 (permalink)
jchammond A True Z Fanatic Join Date: Nov 2014 Location: South Carolina Age: 58 Posts: 15,204 Drives: 13’ 370Z TS 7A/T Rep Power: 2684395	Mine has 26.6" diameter tires on rear & is slow about 3%,,, a 27" would put it on spot (27.2"-like a 345/30/19MPSS) __________________ MazWorx built long block \| FI-TT-100 Stage 2.75 \| IPT built 7A/T http://www.the370z.com/members-370z-...s-musings.html

07-15-2016, 05:34 AM	#12 (permalink)
Guyfromthere Base Member Join Date: Jun 2016 Location: latvia Posts: 90 Drives: 370z 2012 mt Rep Power: 9	Ye i use waze and yav1 on 2 phones and both show that im going slower

09-22-2024, 12:33 PM	#14 (permalink)
cooltoy Elite Member Join Date: Jun 2012 Location: Calgary Posts: 13,978 Drives: 14 PW 370Z S/T MT Rep Power: 243722	Good point, but OP has not been here since 2017. He does not care anymore about an eight year old thread. Rusty and filip00 like this. __________________ Member of kenchan's "photoshopped mods" and "proper offsets" gang.

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