Please explain torque management
TECH Senior Member
Joined: Apr 2002
Posts: 6,080
Likes: 17
From: So.Cal.
Re: Please explain torque management Briefly, if you got an A4, the PCM pulls some timing just as an upshift occurs; this is done to prevent knock (which would otherwise be induced by the higher gear instantaneously increasing the load on the engine);
there may be other aspects to this that I don't know of.
there may be other aspects to this that I don't know of.
TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
Re: Please explain torque management TQ management in an A4 also serves to prolong the life of the tranny by reducing the power on the shifts. M6s have TQ management too. Oftentimes when powershifting to 2nd gear you will feel a bog. That's TM.
Re: Please explain torque management
TQ management in an A4 also serves to prolong the life of the tranny by reducing the power on the shifts. M6s have TQ management too. Oftentimes when powershifting to 2nd gear you will feel a bog. That's TM.
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TECH Senior Member
Joined: Nov 2001
Posts: 9,246
Likes: 3
From: Troy, AL
Re: Please explain torque management
the only thing I feel when hitting second like that is the *** end come out from under me! 
Do it fast enough (as in, don't lift the throttle and never let the nose even THINK about diving) and the TM will rear it's ugly head. LS1 Tech Stories
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Re: Please explain torque management I got this from Joseph a long time ago:
Torque management is a function of the PCM that reduces engine power
under certain conditions. Torque Management is performed for the
following reasons:
To prevent overstressing the powertrain components.
To prevent damage to the vehicle during certain abusive maneuvers.
To reduce engine speed when the IAC is out of the normal operating
range.
The PCM monitors the following sensors and engine parameters to
calculate engine output torque:
Air/Fuel ratio
Mass Air Flow
Manifold Asolute Pressure
Intake Air Temperature
Spark Advance
Engine Speed
Engine Coolant Temperature
A/C Clutch Status
The PCM monitors the torque converter status, the transmission gear
ratio, and the engine speed in order to determine if torque reduction
is required. The PCM retards the spark as appropriate to reduce
engine torque if torque reduction is required. The PCM also shuts
off the fuel to certain injectors to reduce the engine power in the
case of an abusive manuever.
The following are instances when engine power reduction is likely to
be experienced:
During transmission upshifts and downshifts.
Heavy acceleration from a standing start.
The IAC is out of the normal operating range.
When the driver is performing harsh or abusive manuevers such as
shifting into gear at high throttle angles or shifting the
transmission from reverse to drive to create a rocking motion.
The driver is unlikely to notice the torque management actions in the
first two instances. The engine power output will be moderate at
full throttle in the other two cases.
The PCM calculates the amount of spark retard necessary to reduce
engine power by the desired amount. The PCM disables the fuel
injectors for cylinders 1, 4, 6, and 7 in the case of an abusive
manuever.
Torque management is a function of the PCM that reduces engine power
under certain conditions. Torque Management is performed for the
following reasons:
To prevent overstressing the powertrain components.
To prevent damage to the vehicle during certain abusive maneuvers.
To reduce engine speed when the IAC is out of the normal operating
range.
The PCM monitors the following sensors and engine parameters to
calculate engine output torque:
Air/Fuel ratio
Mass Air Flow
Manifold Asolute Pressure
Intake Air Temperature
Spark Advance
Engine Speed
Engine Coolant Temperature
A/C Clutch Status
The PCM monitors the torque converter status, the transmission gear
ratio, and the engine speed in order to determine if torque reduction
is required. The PCM retards the spark as appropriate to reduce
engine torque if torque reduction is required. The PCM also shuts
off the fuel to certain injectors to reduce the engine power in the
case of an abusive manuever.
The following are instances when engine power reduction is likely to
be experienced:
During transmission upshifts and downshifts.
Heavy acceleration from a standing start.
The IAC is out of the normal operating range.
When the driver is performing harsh or abusive manuevers such as
shifting into gear at high throttle angles or shifting the
transmission from reverse to drive to create a rocking motion.
The driver is unlikely to notice the torque management actions in the
first two instances. The engine power output will be moderate at
full throttle in the other two cases.
The PCM calculates the amount of spark retard necessary to reduce
engine power by the desired amount. The PCM disables the fuel
injectors for cylinders 1, 4, 6, and 7 in the case of an abusive
manuever.
Launching!
Joined: Aug 2003
Posts: 216
Likes: 0
From: Phoenix, AZ
Re: Please explain torque management Would this be more noticable on a A4 car when manually trying to shift the car because when I first got my car I used to try to shift it manually when I raced but when I would go to shift manually it would not shift immediately, the motor would sound like it hit a rev limiter, and would kind of die before it would shift (sounds kind of like my old Big Block did when I'd hit the rev limiter on my MSD box). I thought the first owner of my car might have messed with the computer settings and that is why it does that but maybe it's this instead. It shifts fine in drive.
Thread Starter
On The Tree
Joined: Aug 2003
Posts: 117
Likes: 0
From: Cincinnati
Re: Please explain torque management
Would this be more noticable on a A4 car when manually trying to shift the car because when I first got my car I used to try to shift it manually when I raced but when I would go to shift manually it would not shift immediately, the motor would sound like it hit a rev limiter, and would kind of die before it would shift (sounds kind of like my old Big Block did when I'd hit the rev limiter on my MSD box). I thought the first owner of my car might have messed with the computer settings and that is why it does that but maybe it's this instead. It shifts fine in drive.
