Using torque sensor to simulate dyno
Thread Starter
11 Second Club
iTrader: (14)
Joined: Nov 2004
Posts: 1,653
Likes: 1
From: Michigan (Macomb or Lansing)
Using torque sensor to simulate dyno I saw someone that had hptuners set up in a way to calculate torque @ rpms and hp @ rpms by using the transmission's torque sensing sensor.
Does this work on an m6 btw?
I know it can't be 100% accurate but itd be a fun thing to toy with.
Does this work on an m6 btw?
I know it can't be 100% accurate but itd be a fun thing to toy with.
I don't believe there is any sensor, there is a calculation of
Delivered Torque but it's only as good as the data it gets,
and some of that data is what you'd want to be messing
with (AFR, advance) or correcting (MAF, VE -> SD airflow
values).
You can get numbers, just don't place a whole lot of
belief in them (though they may be reasonably close).
Delivered Torque but it's only as good as the data it gets,
and some of that data is what you'd want to be messing
with (AFR, advance) or correcting (MAF, VE -> SD airflow
values).
You can get numbers, just don't place a whole lot of
belief in them (though they may be reasonably close).
For this to work, the ECM's method of calculating the Delivered Engine Torque, the airflow model needs to be properly tuned (wideband preferred) and as precise as possible. That means properly tuning the VE and the MAF, and not disabling either. I have tested this on A4s and M6s and it is very close to dyno or track (MPH) results on most scenarios. Although, and I emphasize this, it is not intended to be posted on the internet as the rwhp numbers of your vehicle. It is another tool to help you see gains in your tuning, by changin timing and/or the targeted fuel ratio. This is the torque model that the ECM actually uses for torque management and/or shift pressures (based on torque). Good luck and happy tuning! 
Thread Starter
11 Second Club
iTrader: (14)
Joined: Nov 2004
Posts: 1,653
Likes: 1
From: Michigan (Macomb or Lansing)
Yeah that's exactly what i wanted to use it for, a dyno for comparison reasons i guess. I realize it isn't numbers to brag about, now how exactly would i set this up?
You simply log Delivered Engine Torque, Engine Speed (RPM) and create a custom pid (Calculated Engine HP) using the formula to convert TQ/RPM to HP. The only issue is, for that to work the ECM needs to be able to properly know the actual airflow going into the engine. If the ECM has not been tuned properly, the results will not correlate. Good luck!
The only issue is, for that to work the ECM needs to be able to properly know the actual airflow going into the engine. If the ECM has not been tuned properly, the results will not correlate. Good luck! 
