Speedometer reading questions

kenchan · 03-05-2010, 10:33 AM

i thought it was taken off the a/c blower speed.

370Zvetlana · 03-05-2010, 11:44 AM

Quote:

Originally Posted by KillerBee370

According to my GPS, my speedo is 1 mph fast.

I would trust my car's speed reading before i trust a GPS, thats for sure

Robert_Nash · 03-05-2010, 12:00 PM

Quote:

Originally Posted by KillerBee370

According to my GPS, my speedo is 1 mph fast.

In my vehicle, my GPS (I use my Passport as a "primary" spedo) indicates the exact same thing...per GPS I'm going 70 while my Z's spedo shows 71 or so.

Then again, those highway readout radar sets I occasionally will usually show something different than what my GPS or the car's spedo is showing!

kenchan · 03-05-2010, 12:05 PM

but then if your tires are over/under inflated...

oh wait, doesnt matter cause it's not connected to the tires...

Vegitto-kun · 03-06-2010, 01:17 AM

I am quite sure that it IS connected to the wheels since I had it happen in two cars.

speed flew up on the ice while i was pretty much standing still

Island_370 · 03-06-2010, 06:33 AM

Quote:

Originally Posted by vipor

I've never heard of a car that uses an individual wheel for the speedo sending unit. Not saying it doesn't exist, but I've never heard of it.

Any car with ABS has wheel spin sensors. It is very easy to use this source of the speedo. In fact, I believe it is Subaru that uses the wheel spin sensors as their "flat tire detection system". It monitors all the wheels and if one is spinning more than the others, then the tire is low on air...hence smaller.

If I were Nissan, I would use the front wheels for the speedo. The car is already monitoring the tire rotation, so why not feed the rotation into a calculator.

Island_370 · 03-06-2010, 06:36 AM

As a follow-up...In the service manuals. The Vehicle Speed Signal is in the Wheels and Tire section. So I would bet against the tranny.

DEpointfive0 · 07-20-2013, 03:32 AM

Bump from the dead

Any difinitive answer?

03-06-2010, 06:36 AM	#22 (permalink)
Island_370 Base Member Join Date: Jun 2009 Location: Puerto Rico Posts: 228 Drives: 09 Nissan 370Z SR M6 Rep Power: 15	As a follow-up...In the service manuals. The Vehicle Speed Signal is in the Wheels and Tire section. So I would bet against the tranny. __________________ Autobahn Country Club (North and South Tracks), Blackhawk Farms, Grattan, Gingerman, Mid-Ohio, Putnam Park, Road America, Sears Point, Thunderhill, VIR and "The Ring"

07-20-2013, 03:32 AM	#23 (permalink)
DEpointfive0 Premium Member Bitches Join Date: Jan 2012 Location: SoCal Posts: 14,824 Drives: a lot Rep Power: 17151	Bump from the dead Any difinitive answer? __________________ Do YOU want to know what/where I got my username from? ( Click to show/hide ) NSFW due to language:

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03-05-2010, 10:33 AM	#16 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141520	i thought it was taken off the a/c blower speed.

03-05-2010, 12:05 PM	#19 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141520	but then if your tires are over/under inflated... oh wait, doesnt matter cause it's not connected to the tires...

03-06-2010, 01:17 AM	#20 (permalink)
Vegitto-kun A True Z Fanatic Join Date: Feb 2010 Location: USA Posts: 2,011 Drives: 09 370Z Rep Power: 262	I am quite sure that it IS connected to the wheels since I had it happen in two cars. speed flew up on the ice while i was pretty much standing still