GPS vs. CAN
07-18-2018 | 12:54 AM
#1
Thread Starter
Rennlist Member
Joined: May 2005
Posts: 2,145
Likes: 178
GPS vs. CAN
When it comes to speed and accelerometer readings, is the a strong preference for GPS versus the values coming from the car directly?
I'm referring to a SoloDL if that makes any difference.
-Shawn
I'm referring to a SoloDL if that makes any difference.
-Shawn
07-18-2018 | 07:50 AM
#2
Rennlist Hoonigan
which cost no drachmas
Lifetime Rennlist
Member
Rennlist
Site Sponsor
which cost no drachmas
Lifetime Rennlist
Member
Rennlist
Site Sponsor
Joined: Dec 2001
Posts: 12,741
Likes: 1,037
From: Manchester, NH
I like GPS speed for general reference. I'll use wheel speeds when looking for brake lockup, diff function etc. GPS speed doesn't have wheel slip, tire growth, or diameter problems, so it's much more accurate.
Accelerometer depends on what I'm looking at. Sometimes is use the GPS, sometimes the device, sometimes the vehicle (if available). The practical difference is the GPS is usually a bit smoother.
Accelerometer depends on what I'm looking at. Sometimes is use the GPS, sometimes the device, sometimes the vehicle (if available). The practical difference is the GPS is usually a bit smoother.
07-18-2018 | 10:09 AM
#3
Rennlist
Basic Site Sponsor
Basic Site Sponsor
Joined: Jun 2008
Posts: 19,273
Likes: 3,470
From: Durham, NC and Virginia International Raceway
+1
In the SDL, I would rely on GPS calculated accelerometer readings if you are not religious about calibrating the unit IN PLACE properly. Yes, you can fix it later, but it’s a PITA.
As Matt says, most of the topical, expedited review can rely on the GPS calculated accelerometer channels, but GPS speed as reference, especially in a car with any tire/wheel/sizing mods, is a godsend.
In the SDL, I would rely on GPS calculated accelerometer readings if you are not religious about calibrating the unit IN PLACE properly. Yes, you can fix it later, but it’s a PITA.
As Matt says, most of the topical, expedited review can rely on the GPS calculated accelerometer channels, but GPS speed as reference, especially in a car with any tire/wheel/sizing mods, is a godsend.
07-18-2018 | 02:56 PM
#5
Rennlist
Basic Site Sponsor
Basic Site Sponsor
Joined: Jun 2008
Posts: 19,273
Likes: 3,470
From: Durham, NC and Virginia International Raceway
07-18-2018 | 03:02 PM
#6
Rennlist Hoonigan
which cost no drachmas
Lifetime Rennlist
Member
Rennlist
Site Sponsor
which cost no drachmas
Lifetime Rennlist
Member
Rennlist
Site Sponsor
Joined: Dec 2001
Posts: 12,741
Likes: 1,037
From: Manchester, NH
Trending Topics
09-06-2018 | 11:01 AM
#8
Rennlist
Basic Site Sponsor
Basic Site Sponsor
Joined: Jun 2008
Posts: 19,273
Likes: 3,470
From: Durham, NC and Virginia International Raceway
Unless you have 20 Hz RaceGrade or VBOX Pro 20 Hz GPs sampling and calculation...
Seriously, I agree, Jerry. As long as the logger isn’t hard mounted or flopping around in the car...