OBD II scan tool and dyno
01-01-2005, 11:54 PM
#1
Registered User
Thread Starter
Join Date: Dec 2004
Location: So Cal
Posts: 35
Likes: 0
Received 0 Likes
on
0 Posts
OBD II scan tool and dyno
I was just wondering if anyone has used one of these OBDII scan tools and dyno that connect to a palm pilot? I was on ebay and saw a couple for sale. They say they can check HP, torque, and gas milage, along with the normal code. Does anyone know how accurate the are?
01-02-2005, 06:53 AM
#2
Contributing Member
Originally Posted by Troymm
I was just wondering if anyone has used one of these OBDII scan tools and dyno that connect to a palm pilot? I was on ebay and saw a couple for sale. They say they can check HP, torque, and gas milage, along with the normal code. Does anyone know how accurate the are?
When you go to their website you will see all the features (they didn't miss much for sure).
Do a search for "Auterra" on here and you will see alot of info and who is using them.
If you don't mind paying a few bucks for it, I think they are an invaluable tool.
01-02-2005, 07:34 AM
#3
Guest
Join Date: Jun 2003
Location: North Pole
Posts: 1,615
Likes: 0
Received 0 Likes
on
0 Posts
I have the Auterra too, and as far as checking MPG, HP, Torque.... I’m not so sure. You must understand how it works. A generic formula is applied to the readings from the computer.
To get a HP reading if I recall right you specify weight, drag/frontal area, gearing and tire diameter. Then the Auterra probably uses an internal timer to figure out how long it took until the "speed sensor" in the computer returns say 60mph. It then just figures out how long it took to accelerate to 60mph and applies to it the figures you put in previously. The same can be easily accomplished with a stop watch and some paper.
Conclude on your own how accurate that is.
To get a HP reading if I recall right you specify weight, drag/frontal area, gearing and tire diameter. Then the Auterra probably uses an internal timer to figure out how long it took until the "speed sensor" in the computer returns say 60mph. It then just figures out how long it took to accelerate to 60mph and applies to it the figures you put in previously. The same can be easily accomplished with a stop watch and some paper.
Conclude on your own how accurate that is.
01-02-2005, 12:52 PM
#4
Contributing Member
Join Date: Feb 2004
Location: Morgan Hill, CA
Posts: 1,876
Likes: 0
Received 0 Likes
on
0 Posts
I am looking at getting this one to use with my small laptop.
http://www.autotap.com/autotap_for_windows.html
I carry the laptop with most times when going on a trail for extra GPS maps if needed, bigger display for the GPS (again if needed), but mostly just to download pictures at night and edit.
I think if you calibrate the true speed with a GPS vs the indicated speed (or speed the vehicle thinks it's doing) you should be able to get reasonably accurate 1/4 and 0-60 times. To conclude HP and TQ curves will be way more tricky as you need to know exact weight, etc, etc.
http://www.autotap.com/autotap_for_windows.html
I carry the laptop with most times when going on a trail for extra GPS maps if needed, bigger display for the GPS (again if needed), but mostly just to download pictures at night and edit.
I think if you calibrate the true speed with a GPS vs the indicated speed (or speed the vehicle thinks it's doing) you should be able to get reasonably accurate 1/4 and 0-60 times. To conclude HP and TQ curves will be way more tricky as you need to know exact weight, etc, etc.
01-02-2005, 01:13 PM
#5
Contributing Member
Originally Posted by 4RUNR
I have the Auterra too, and as far as checking MPG, HP, Torque.... I’m not so sure. You must understand how it works. A generic formula is applied to the readings from the computer.
To get a HP reading if I recall right you specify weight, drag/frontal area, gearing and tire diameter. Then the Auterra probably uses an internal timer to figure out how long it took until the "speed sensor" in the computer returns say 60mph. It then just figures out how long it took to accelerate to 60mph and applies to it the figures you put in previously. The same can be easily accomplished with a stop watch and some paper.
Conclude on your own how accurate that is.
To get a HP reading if I recall right you specify weight, drag/frontal area, gearing and tire diameter. Then the Auterra probably uses an internal timer to figure out how long it took until the "speed sensor" in the computer returns say 60mph. It then just figures out how long it took to accelerate to 60mph and applies to it the figures you put in previously. The same can be easily accomplished with a stop watch and some paper.
Conclude on your own how accurate that is.
As long as your speed and weight are acurate the calculation for HP will be too.
01-02-2005, 02:50 PM
#6
Guest
Join Date: Jun 2003
Location: North Pole
Posts: 1,615
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by MTL_4runner
Unless you have a dyno, that is the way HP is calculated (via the laws of physics).
As long as your speed and weight are acurate the calculation for HP will be too.
As long as your speed and weight are acurate the calculation for HP will be too.
And neither will it be consistent due to meteorological changes alone. The Auterra would not fare better than the G-Tech units as far as accuracy and consistency go. And we know how satisfied G-Tech buyers are
Auterra has many purposes, but little performance tuning value.
Thread
Thread Starter
Forum
Replies
Last Post
RobotMoose
93-98 T100s
13
02-22-2020 07:44 AM
