TB opens more than 100%
Race Director
Joined: May 2004
Posts: 16,667
Likes: 1,209
From: Raleigh, NC
St. Jude Donor '15
It's more of a confirmation than a calibration. The resistance through several (at least two) circuits on the throttle position sensor will change depending on the throttle position. Most have two circuits that go in opposite directions, so as throttle increases resistance will go up in one circuit and down in the other. The computer already knows what resistance it should be seeing from both circuits for a given throttle position.
If something doesn't match what it should then you get a reduced power message and you aren't going anywhere very fast
These throttle position to resistance points are set and not something that are re-learned
If something doesn't match what it should then you get a reduced power message and you aren't going anywhere very fast
These throttle position to resistance points are set and not something that are re-learned
Last edited by schpenxel; Apr 10, 2017 at 02:38 PM.
Thread Starter
Instructor
Joined: Sep 2016
Posts: 207
Likes: 34
It's more of a confirmation than a calibration. The resistance through several (at least two) circuits on the throttle position sensor will change depending on the throttle position. Most have two circuits that go in opposite directions, so as throttle increases resistance will go up in one circuit and down in the other. The computer already knows what resistance it should be seeing from both circuits for a given throttle position.
If something doesn't match what it should then you get a reduced power message and you aren't going anywhere very fast
These throttle position to resistance points are set and not something that are re-learned
If something doesn't match what it should then you get a reduced power message and you aren't going anywhere very fast
These throttle position to resistance points are set and not something that are re-learned
I can't see how a precise throttle position adjustment should take place, without a prior calibration to both positive stops.
But I might be wrong here.
It is also possible that the system is aware that the positive stop is at more than100% and calibrates accordingly.
When I have some spare time I will dive a bit deeper.
Regards
Götz
Race Director
Joined: May 2004
Posts: 16,667
Likes: 1,209
From: Raleigh, NC
St. Jude Donor '15
Where are you seeing a rough throttle position? There's quite a few PID'd for TPS, some are extremely fast and precise. A lot of the obd scanners aren't going to show you everything
