Speedometer recalibration
 

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

Do you have aftermarket wheels?

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

What size tires are on it?

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

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

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

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

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

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)

:D

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

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.

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

Like digging. I have a job opening.