WOT question
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WOT question
When towing up a hill fo example and you have the truck at WOT. Does this put the engine under a great deal of stress? It only spinning 2800 rpm but the throttle is wide open. Should I just back off the throttle and take it easy or does it really matter. I know this is a stupid question and in think I know the answer to it, but I just wanted your input. Thanks
99 5.4 4x4 e40d 265,000
99 5.4 4x4 e40d 265,000
Hotshot
Joined: Dec 2012
Posts: 11,271
Likes: 1,654
From: Las Cruces New Mexico
These modern engines love reving up high, you can be at the rev limiter all day and no harm will be done. Ive been loaded way past the maximum tow rating at 4k rpm going up an 8% grade for 8 miles my truck had at the time 280k it now has 302k and still going strong. Just make sute your cooling system is working properly as well as the fan clutch and you will be alright. Also a large transmission cooler will keep your tranny happy.
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
The way I read your post, your loaded heavy, the hill is steep and the rpm is down to 2800 rpm in the only gear that will allow the motor to make enough Torque to pull the load.
At 2800 rpm your not yet to max torque around 3200 so it only gets worse.
If this is correct, guess what is taking punishment?
The transmission CONVERTER. Same as standing still with the brakes applied on full throttle...
Done to many times, the converter can Balloon, break up the Torrington bearing, pump the pieces through the trans then you need a complete rebuild including a new Converter.
If you have it rebuilt stock and go do it again, the same thing can happen all over again.
The stock converters are not very tough under this kind of loading.
Ask me how I know?
A stock 4.6L has enough torque to do this if running without any faults.
I run a custom rebuild.
If the above is not what your doing, disregard it.
At 2800 rpm your not yet to max torque around 3200 so it only gets worse.
If this is correct, guess what is taking punishment?
The transmission CONVERTER. Same as standing still with the brakes applied on full throttle...
Done to many times, the converter can Balloon, break up the Torrington bearing, pump the pieces through the trans then you need a complete rebuild including a new Converter.
If you have it rebuilt stock and go do it again, the same thing can happen all over again.
The stock converters are not very tough under this kind of loading.
Ask me how I know?
A stock 4.6L has enough torque to do this if running without any faults.
I run a custom rebuild.
If the above is not what your doing, disregard it.
Thread Starter
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Senior User
Joined: Jun 2017
Posts: 195
Likes: 0
The way I read your post, your loaded heavy, the hill is steep and the rpm is down to 2800 rpm in the only gear that will allow the motor to make enough Torque to pull the load.
At 2800 rpm your not yet to max torque around 3200 so it only gets worse.
If this is correct, guess what is taking punishment?
The transmission CONVERTER. Same as standing still with the brakes applied on full throttle...
Done to many times, the converter can Balloon, break up the Torrington bearing, pump the pieces through the trans then you need a complete rebuild including a new Converter.
If you have it rebuilt stock and go do it again, the same thing can happen all over again.
The stock converters are not very tough under this kind of loading.
Ask me how I know?
A stock 4.6L has enough torque to do this if running without any faults.
I run a custom rebuild.
If the above is not what your doing, disregard it.
At 2800 rpm your not yet to max torque around 3200 so it only gets worse.
If this is correct, guess what is taking punishment?
The transmission CONVERTER. Same as standing still with the brakes applied on full throttle...
Done to many times, the converter can Balloon, break up the Torrington bearing, pump the pieces through the trans then you need a complete rebuild including a new Converter.
If you have it rebuilt stock and go do it again, the same thing can happen all over again.
The stock converters are not very tough under this kind of loading.
Ask me how I know?
A stock 4.6L has enough torque to do this if running without any faults.
I run a custom rebuild.
If the above is not what your doing, disregard it.
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
With a 3.55 rear gear, 60 mph in third won't be 2800 rpm.
More like 2000 or less depending on the speedo accuracy.
Two things:
A. If you lock out OD, the trans will go into converter lockup, a good thing.
B. If a down shift occurs and you don't lock out the OD, the converter does not lock up and will heat the fluid more from converter fluid shearing due to slip and lose a little fuel mileage.
More like 2000 or less depending on the speedo accuracy.
Two things:
A. If you lock out OD, the trans will go into converter lockup, a good thing.
B. If a down shift occurs and you don't lock out the OD, the converter does not lock up and will heat the fluid more from converter fluid shearing due to slip and lose a little fuel mileage.
Thread Starter
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Senior User
Joined: Jun 2017
Posts: 195
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With a 3.55 rear gear, 60 mph in third won't be 2800 rpm.
More like 2000 or less depending on the speedo accuracy.
Two things:
A. If you lock out OD, the trans will go into converter lockup, a good thing.
B. If a down shift occurs and you don't lock out the OD, the converter does not lock up and will heat the fluid more from converter fluid shearing due to slip and lose a little fuel mileage.
More like 2000 or less depending on the speedo accuracy.
Two things:
A. If you lock out OD, the trans will go into converter lockup, a good thing.
B. If a down shift occurs and you don't lock out the OD, the converter does not lock up and will heat the fluid more from converter fluid shearing due to slip and lose a little fuel mileage.
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
Why are we playing this game and you not give all the info in the first post?
Calculate the engine rpm, the road speed using the info you already know.
In OD and third gear.
Consider tire diameter and whether the speedo is accurate if you changed rear gear ratio and not corrected the odometer reading.
All were doing is wasting time and can't offer any accuracy this way.
Calculate the engine rpm, the road speed using the info you already know.
In OD and third gear.
Consider tire diameter and whether the speedo is accurate if you changed rear gear ratio and not corrected the odometer reading.
All were doing is wasting time and can't offer any accuracy this way.
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