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Message: Durametric vs. BT-1 throttle readings on OBD port
Changed By: Trygve (San Francisco, CA)
Change Date: November 06, 2016 10:59PM
Durametric vx. vs. BT-1 throttle readings on OBD port
Change Date: November 06, 2016 10:59PM
Durametric vx. vs. BT-1 throttle readings on OBD port
I'm using two different tools for reading the throttle position sensor, and they are giving me two completely different answers. What?!
For a couple of races earlier this year I was disappointed in my performance. On a whim at the next event we decided to check the throttle cable, and found two problems. First there was something wrong at the linkage point under the car where the pedal cable meets the engine cable. Then I found further that the height adjustment on the Rennline pedal was preventing the pedal from going all the way to the floor! Using the Durametric, and checking both with the pedal on the floor and by manually pulling the lever on the throttle body (to achieve 100% throttle plate opening), we found the following using the Durametric cable and software:
Manual test at throttle body: 76 (presumably that is 100% but ... who knows?)
Starting point: pedal 50 -- NO WONDER I WAS SLOW!
After linkage fix: pedal 65
After pedal height adjustment: pedal 76
Back on track for the next session, the car was noticeably more responsive to mashing the gas pedal and I went faster immediately.
I knew I might need to take a closer look at the pedal and make some adjustments. Because the Durametric is kind of a pain especially when trying to read realtime values on a computer across with a tiny font and horrible charts several feet away, I researched and bought a GoPoint BT-1 which plugs into the OBD port and via Bluetooth displays values on your phone. Here's what it reads:
Manual test at throttle body: 100
Pedal: 98-100
Plug the Durametric back in and check it back-to-back:
Manual test at throttle body: 76
Pedal: 76
Why do the two devices display the data differently? Is it just a number coming through the OBD, or could the BT-1 app be saying "oh, an OBD value of 76 on the throttle means 100% so I will display 100". ? Are there two sensors and I'm looking at a different one on each device?
For a couple of races earlier this year I was disappointed in my performance. On a whim at the next event we decided to check the throttle cable, and found two problems. First there was something wrong at the linkage point under the car where the pedal cable meets the engine cable. Then I found further that the height adjustment on the Rennline pedal was preventing the pedal from going all the way to the floor! Using the Durametric, and checking both with the pedal on the floor and by manually pulling the lever on the throttle body (to achieve 100% throttle plate opening), we found the following using the Durametric cable and software:
Manual test at throttle body: 76 (presumably that is 100% but ... who knows?)
Starting point: pedal 50 -- NO WONDER I WAS SLOW!
After linkage fix: pedal 65
After pedal height adjustment: pedal 76
Back on track for the next session, the car was noticeably more responsive to mashing the gas pedal and I went faster immediately.
I knew I might need to take a closer look at the pedal and make some adjustments. Because the Durametric is kind of a pain especially when trying to read realtime values on a computer across with a tiny font and horrible charts several feet away, I researched and bought a GoPoint BT-1 which plugs into the OBD port and via Bluetooth displays values on your phone. Here's what it reads:
Manual test at throttle body: 100
Pedal: 98-100
Plug the Durametric back in and check it back-to-back:
Manual test at throttle body: 76
Pedal: 76
Why do the two devices display the data differently? Is it just a number coming through the OBD, or could the BT-1 app be saying "oh, an OBD value of 76 on the throttle means 100% so I will display 100". ? Are there two sensors and I'm looking at a different one on each device?
Original Message
Author: Trygve (San Francisco, CA)Date: November 06, 2016 10:58PM
Durametric vx. BT-1 throttle readings on OBD port
I'm using two different tools for reading the throttle position sensor, and they are giving me two completely different answers. What?!
For a couple of races earlier this year I was disappointed in my performance. On a whim at the next event we decided to check the throttle cable, and found two problems. First there was something wrong at the linkage point under the car where the pedal cable meets the engine cable. Then I found further that the height adjustment on the Rennline pedal was preventing the pedal from going all the way to the floor! Using the Durametric, and checking both with the pedal on the floor and by manually pulling the lever on the throttle body (to achieve 100% throttle plate opening), we found the following using the Durametric cable and software:
Manual test at throttle body: 76 (presumably that is 100% but ... who knows?)
Starting point: pedal 50 -- NO WONDER I WAS SLOW!
After linkage fix: pedal 65
After pedal height adjustment: pedal 76
Back on track for the next session, the car was noticeably more responsive to mashing the gas pedal and I went faster immediately.
I knew I might need to take a closer look at the pedal and make some adjustments. Because the Durametric is kind of a pain especially when trying to read realtime values on a computer across with a tiny font and horrible charts several feet away, I researched and bought a GoPoint BT-1 which plugs into the OBD port and via Bluetooth displays values on your phone. Here's what it reads:
Manual test at throttle body: 100
Pedal: 98-100
Plug the Durametric back in and check it back-to-back:
Manual test at throttle body: 76
Pedal: 76
Why do the two devices display the data differently? Is it just a number coming through the OBD, or could the BT-1 app be saying "oh, an OBD value of 76 on the throttle means 100% so I will display 100". ? Are there two sensors and I'm looking at a different one on each device?
For a couple of races earlier this year I was disappointed in my performance. On a whim at the next event we decided to check the throttle cable, and found two problems. First there was something wrong at the linkage point under the car where the pedal cable meets the engine cable. Then I found further that the height adjustment on the Rennline pedal was preventing the pedal from going all the way to the floor! Using the Durametric, and checking both with the pedal on the floor and by manually pulling the lever on the throttle body (to achieve 100% throttle plate opening), we found the following using the Durametric cable and software:
Manual test at throttle body: 76 (presumably that is 100% but ... who knows?)
Starting point: pedal 50 -- NO WONDER I WAS SLOW!
After linkage fix: pedal 65
After pedal height adjustment: pedal 76
Back on track for the next session, the car was noticeably more responsive to mashing the gas pedal and I went faster immediately.
I knew I might need to take a closer look at the pedal and make some adjustments. Because the Durametric is kind of a pain especially when trying to read realtime values on a computer across with a tiny font and horrible charts several feet away, I researched and bought a GoPoint BT-1 which plugs into the OBD port and via Bluetooth displays values on your phone. Here's what it reads:
Manual test at throttle body: 100
Pedal: 98-100
Plug the Durametric back in and check it back-to-back:
Manual test at throttle body: 76
Pedal: 76
Why do the two devices display the data differently? Is it just a number coming through the OBD, or could the BT-1 app be saying "oh, an OBD value of 76 on the throttle means 100% so I will display 100". ? Are there two sensors and I'm looking at a different one on each device?