Torque Limits?
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More Turbo
Joined: Jan 2011
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Torque Limits?
I keep hearing and reading about torque being limited in 1st and 2nd on the SRW and 1st on the DRW but haven't seen what it's limited to. What is the limit and is there a way to disable this?
Logistics Pro
Joined: Apr 2000
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From: Mills River
This article suggests the SRW diesel engine torque is derated in the first three gears.
HTH,
Jim / crewzer
HTH,
Jim / crewzer
Hotshot
Joined: Apr 2013
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From: NH
Nobody knows *what* the derating is, but is only affects torque, not horsepower.
Hotshot
Joined: Apr 2013
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From: NH
It's possible. Consider the Ford 3.5L EcoBoost - in the pickup, it put out 365HP and 420lb-ft (up to the second generation). This same engine, in all of its transverse applications (Ford Explorer, Taurus SHO, Lincoln MKS, etc) the exact same engine produced the same 365HP but torque was reduced to 350lb-ft. There are no differences between the engines internally.
Posting Guru
Joined: Nov 2016
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Do those gas motors have a variable valve train? Also what about timing differences possibly. I'd have to see it from Ford to believe that a reduction in torque doesn't equate to a reduction in horsepower. Only think that could change is fuel and air right? Maybe I'm wrong but I'm skeptical.
Logistics Pro
Joined: Apr 2000
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From: Mills River
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Tuned
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Really wish I had some of that derated torque in 1, 2, and 3. I guess I understand their reasoning...well, actually, no, no I do not. Are they trying to protect something in the drivetrain or are they worried about safety? Wish there was a way to turn this "feature" off from the factory.
--Nathan
--Nathan
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Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
You are wrong. They are talking about peak horsepower. Reducing torque at lower RPMs, which is usually what's done, doesn't affect the torque at max horsepower RPM, so the peak horsepower is unchanged. For example, if the engine makes peak torque at 1600 RPM and you limit torque at that RPM, and it makes peak horsepower at 3200 RPM, then peak horsepower is unaffected.
I didn't work on this truck, so all I have is an educated guess from doing this type of work at Ford.
The lower torque is probably due to a mechanical limitation somewhere in the drivetrain. It isn't done for fun, when I was there it was only done to keep from breaking parts. We found that customers really didn't like it when parts broke.
Really wish I had some of that derated torque in 1, 2, and 3. I guess I understand their reasoning...well, actually, no, no I do not. Are they trying to protect something in the drivetrain or are they worried about safety? Wish there was a way to turn this "feature" off from the factory.
--Nathan
--Nathan
The lower torque is probably due to a mechanical limitation somewhere in the drivetrain. It isn't done for fun, when I was there it was only done to keep from breaking parts. We found that customers really didn't like it when parts broke.
Posting Guru
Joined: Nov 2016
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You are wrong. They are talking about peak horsepower. Reducing torque at lower RPMs, which is usually what's done, doesn't affect the torque at max horsepower RPM, so the peak horsepower is unchanged. For example, if the engine makes peak torque at 1600 RPM and you limit torque at that RPM, and it makes peak horsepower at 3200 RPM, then peak horsepower is unaffected.
I didn't work on this truck, so all I have is an educated guess from doing this type of work at Ford.
The lower torque is probably due to a mechanical limitation somewhere in the drivetrain. It isn't done for fun, when I was there it was only done to keep from breaking parts. We found that customers really didn't like it when parts broke.
I didn't work on this truck, so all I have is an educated guess from doing this type of work at Ford.
The lower torque is probably due to a mechanical limitation somewhere in the drivetrain. It isn't done for fun, when I was there it was only done to keep from breaking parts. We found that customers really didn't like it when parts broke.
Super Moderator
Joined: Aug 2003
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From: Isanti, MN
You could rephrase that by saying torque is limited at 2,800 RPMs...because if it made 925 ft-lbs @ 2,800 RPMs you would have 493 peak horsepower. You can't have one without the other.
Posting Guru
Joined: Nov 2016
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Ding ding ding, we have a winner! It's very simple math, folks...horsepower is nothing but torque at speed.
You could rephrase that by saying torque is limited at 2,800 RPMs...because if it made 925 ft-lbs @ 2,800 RPMs you would have 493 peak horsepower. You can't have one without the other.
You could rephrase that by saying torque is limited at 2,800 RPMs...because if it made 925 ft-lbs @ 2,800 RPMs you would have 493 peak horsepower. You can't have one without the other.
