Which speed signal is right?
06-22-2008, 02:01 PM
#1
Which speed signal is right?
The speed on my apex'i avc-r doesn't match my speedo and doesn't match my gps speed...
On speedo says 100, gps says 91 avc-r says 79
Any Ideas?
On speedo says 100, gps says 91 avc-r says 79
Any Ideas?
06-22-2008, 05:21 PM
#7
Drifting
Join Date: Feb 2003
Location: Akron, Ohio
Posts: 2,254
Likes: 0
Received 0 Likes
on
0 Posts
The GPS is the most accurate. Have you changed your tires/wheels on the car... That seems HUGE difference on the speedo for a stock set. That is 9% off. I was thinking they were more on the line of 4-5% off.
Trending Topics
06-22-2008, 05:24 PM
#8
Freshly done up stock phonies, 16/7 16/8 with 205 front and 225 rear
06-23-2008, 01:33 AM
#11
Drifting
Join Date: Feb 2003
Location: Akron, Ohio
Posts: 2,254
Likes: 0
Received 0 Likes
on
0 Posts
I think you can send out your speedo to get it calibrated. Really, I would just what you have as a reference. So if you know when your speedo says 100 = 91 actual just use that across the board. So at 50 speedo you would be going only 45.5 actual.
06-23-2008, 09:06 AM
#13
Rennlist Member
I have no idea what the AVC does and doesn't do, but if it's getting a speed signal from the wheel speed sensor, there is probably a calibration setup that's required.
Many data acquisition units use a magnetic sensor to measure axle or wheel rotation. Of course your speed will be determined by the circumfrence of the wheel (the linear distance it travels in 1 revolution), which can change dramatically, even for different brands of the same size tire.
Many data acquisition units use a magnetic sensor to measure axle or wheel rotation. Of course your speed will be determined by the circumfrence of the wheel (the linear distance it travels in 1 revolution), which can change dramatically, even for different brands of the same size tire.
06-23-2008, 10:58 AM
#14
I have no idea what the AVC does and doesn't do, but if it's getting a speed signal from the wheel speed sensor, there is probably a calibration setup that's required.
Many data acquisition units use a magnetic sensor to measure axle or wheel rotation. Of course your speed will be determined by the circumfrence of the wheel (the linear distance it travels in 1 revolution), which can change dramatically, even for different brands of the same size tire.
Many data acquisition units use a magnetic sensor to measure axle or wheel rotation. Of course your speed will be determined by the circumfrence of the wheel (the linear distance it travels in 1 revolution), which can change dramatically, even for different brands of the same size tire.
