Speedometer Error on 07 G35
#16
#18
Originally Posted by ElixXxeR
All cars are designed from the manufacturer to have a 3-5% overestimation to slow drivers down.
Thats not correct. I have never heard of anything like that. But i have heard of human error, so maybe our boys down in Osaka screwed things up??
Those are pretty bad figures if G35 is right
#19
#20
Originally Posted by G-Whizzer
Geesh - I'm not sure GPS is what you want to use to measure MPH.
Those local radar machines are +/- 2 MPH and are +/- 2 MPH with my speedo. (not the bathing suit).
A DYNO even at low speeds might answer the question...
Or maybe go 100 MPH and then ask the officer what you were doing !??
Those local radar machines are +/- 2 MPH and are +/- 2 MPH with my speedo. (not the bathing suit).
A DYNO even at low speeds might answer the question...
Or maybe go 100 MPH and then ask the officer what you were doing !??
#21
Do you guys have a place in your areas that specialize in Calibrating speedometers? In Calgary we have Mr. Speedometer, the guy has a deal with the local prosecutor and gets tons of customers from people looking to get out of some points. He told my dad, a chronic speeder, that most new cars aren't even close to properly calibrated often times they are off by as much as + or - 5MPH.
#24
Cars are NOT overestimated from the factory, unless you own a Honda.
Honda just settled a huge suit because their speedos were 3.75% off, causing warranties to expire 3.75% sooner, and excecssive mileage pentalities on leases.
For the record, the SAE requests that speedometers be within +/-4%, but there is no requirement.
There is supposedely a class action lawsuit against Nissan based on the Altima speedo, but I haven't heard anything about any other car.
There are a lot of different factors that could play in to speedo readings, and I'm guessing that the tires are the biggest factor in this case.
EDIT: The Honda information is about odometers, not speedometers. I would think that the two would be directly related, but I found some information that makes me think otherwise.
Honda just settled a huge suit because their speedos were 3.75% off, causing warranties to expire 3.75% sooner, and excecssive mileage pentalities on leases.
For the record, the SAE requests that speedometers be within +/-4%, but there is no requirement.
There is supposedely a class action lawsuit against Nissan based on the Altima speedo, but I haven't heard anything about any other car.
There are a lot of different factors that could play in to speedo readings, and I'm guessing that the tires are the biggest factor in this case.
EDIT: The Honda information is about odometers, not speedometers. I would think that the two would be directly related, but I found some information that makes me think otherwise.
Last edited by KPierson; 03-19-2007 at 02:12 PM.
#25
Originally Posted by mathur999
Well guys I have you all beat. I have the 07 sport 5AT with Blizzak WS-50's and appropriate rims that I bought from the Infiniti Dealership and I am always reading 9-11 km/h faster in the car than another car at the same speed or from my portable GPS.... Annoying. I have to get it serviced with the dealership. I also have the same problem with the summer tires...
C.
#26
#27
Originally Posted by G35Now!
Checked mine on the way to the airport (how do you figure tenths when looking at your speedo???). At a noted 75 on the speedo, right on the line, GPS read 74. Will have to do it with my other Garmin tho, this one doesn't show tenths.
Pretty close tho.
Pretty close tho.
The only reason I have my mph in tenths is because I used a conversion program to change from km/h. This one :Conversions
#28
This topic has turned into a GPS debate but the culprit is probably still the actual tire size. Just try your GPS in another car or two and you will see they are pretty accurate. I've had mine up to about 550 MPH accurately?.. oh wait, that was in a airliner.![Stick Out Tongue](https://g35driver.com/forums/images/smilies/tongue.gif)
PS: Mine shows tenths. My speedo was off about 1.4 MPH on average over several days at a constant speed.
![Stick Out Tongue](https://g35driver.com/forums/images/smilies/tongue.gif)
PS: Mine shows tenths. My speedo was off about 1.4 MPH on average over several days at a constant speed.
Last edited by EWG35; 03-19-2007 at 04:40 PM.