Another Torque Management Question
Thread Starter
Launching!
Joined: Dec 2001
Posts: 250
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From: Albuquerque, New Mexico
Another Torque Management Question A friend of mine has a 2000 C5 which has had heads and cam package plus aircleaner and some other boltons. He used the HPP3 to set his PCM. He then dynoed at sea level and was getting 390 ft/lbs at the rear wheels. We looked at his flashfile with LS1-Edit under ignition, and the max torque is set to 350. How can that be? I thought the TM was supposed to limit it to this value.
TECH Senior Member
Joined: Nov 2001
Posts: 7,036
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From: Lake Zurich, IL
Re: Another Torque Management Question Torque Management only limits power during the shifts.
It will (or at least on my cars tables) lower timing advance from xx down to -10 degrees between shifts (-10 degrees is the lowest it will go, but it wont always go that low).
So example, my car would run 28 degrees of timing but during shifts would go down to -5 degrees, so it would drop 33 degrees of timing during the shift.
It will (or at least on my cars tables) lower timing advance from xx down to -10 degrees between shifts (-10 degrees is the lowest it will go, but it wont always go that low).
So example, my car would run 28 degrees of timing but during shifts would go down to -5 degrees, so it would drop 33 degrees of timing during the shift.
Thread Starter
Launching!
Joined: Dec 2001
Posts: 250
Likes: 0
From: Albuquerque, New Mexico
Re: Another Torque Management Question That's interesting. I have noticed that the big "tuners" set this value up to 550-650, even on the manual tranny cars. I wonder if there is some other use for this.
TECH Resident
Joined: Jan 2002
Posts: 754
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From: USA
Re: Another Torque Management Question The PCM for one has no way of knowing a manual trannie is being shifted
TM is also used for active handling, anything where one tire is seen rotating faster then another.
During a chassie dyno, front wheels are not turning at all so PCM pukes DTCs, shut down those functions and now higher torque is not acted on,
TM is time based, as on a dyno, you get to 2,000 RPMS, then go WOT so it is easing into higher Tq and not a sudden spin of the tires or hard launch at the drags, that would spike TM and trigger it.
Setting TM to some high number is unsafe, for now there could be valid reasons you want TM to kick in ( sand, ice, water, etc) and now those functions to help protect you will not kick in.
IMHO, See what the max avg Tq you have and set TM to just above it so that any sudden spin of a wheel will allow those functioms to operate.
Make a flash for racing purpose only that has YM totally turned off.
TM is also used for active handling, anything where one tire is seen rotating faster then another.
During a chassie dyno, front wheels are not turning at all so PCM pukes DTCs, shut down those functions and now higher torque is not acted on,
TM is time based, as on a dyno, you get to 2,000 RPMS, then go WOT so it is easing into higher Tq and not a sudden spin of the tires or hard launch at the drags, that would spike TM and trigger it.
Setting TM to some high number is unsafe, for now there could be valid reasons you want TM to kick in ( sand, ice, water, etc) and now those functions to help protect you will not kick in.
IMHO, See what the max avg Tq you have and set TM to just above it so that any sudden spin of a wheel will allow those functioms to operate.
Make a flash for racing purpose only that has YM totally turned off.
