Torqushift breaking...
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Joined: Oct 2004
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From: Blanco, Texas
Dont get me wrong, I absolutely LOVE my new 05' 6.0 crew cab dually 4x4. It without a doubt is the BEST truck on the market. This is coming from a Die Hard cummins man. My wife has an 03 eddie bauer 4x4 excursion with the same power train, and we are COMPLETELY satisfied. However, when being PUSHED downhill by a big goosneck, NOTHING beats an exhaust brake. Thats why big rigs have them. Dodge a jacobs exhaust break as a factory option on their manual tranny only, so i'm sure ford has not approved it yet.
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Originally Posted by stanphil
Dont get me wrong, I absolutely LOVE my new 05' 6.0 crew cab dually 4x4. It without a doubt is the BEST truck on the market. This is coming from a Die Hard cummins man. My wife has an 03 eddie bauer 4x4 excursion with the same power train, and we are COMPLETELY satisfied. However, when being PUSHED downhill by a big goosneck, NOTHING beats an exhaust brake. Thats why big rigs have them. Dodge a jacobs exhaust break as a factory option on their manual tranny only, so i'm sure ford has not approved it yet.
Post Fiend
Joined: Aug 2002
Posts: 5,324
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From: Denton,TX
Although some companies sell exhaust brakes for the PSD (both 7.3 and 6.0), you are not supposed to use them on these engines because of the hydraulic valves. Actually, International asked Jacobs not to design a brake for these engines. Also, if you look in your warranty guide, damage from an exhuast brake (a real possibility on these engines for the above mentioned reason) will not be covered under warranty.
Post Fiend
Joined: Aug 2002
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From: Denton,TX
Originally Posted by stanphil
Great point John, I never thought of that. BTW, is there a valve adjustment required on this engine like the cummins needs every 135k miles?
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Originally Posted by johnsdiesel
Although some companies sell exhaust brakes for the PSD (both 7.3 and 6.0), you are not supposed to use them on these engines because of the hydraulic valves. Actually, International asked Jacobs not to design a brake for these engines. Also, if you look in your warranty guide, damage from an exhuast brake (a real possibility on these engines for the above mentioned reason) will not be covered under warranty.
From previous posts it looks like Torqushift is not enough on long grades if you pull heavy load (more than 12k). Exhaust brake may damage the hydraulic valves and should not be used. Is there any other option for PSD?
Post Fiend
Joined: Aug 2002
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From: Denton,TX
I think you guys are forgetting that an exhaust brake and the tow/haul mode of the torqshift are not designed to REPLACE braking, but to ASSIST braking. Certianly if you are towing within the limits of your vehicle and observing safe speeds there is more than enough braking ability to handle the load. Items like an exhaust brake are a luxery on a light duty truck IMO.
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Originally Posted by johnsdiesel
I think you guys are forgetting that an exhaust brake and the tow/haul mode of the torqshift are not designed to REPLACE braking, but to ASSIST braking. Certianly if you are towing within the limits of your vehicle and observing safe speeds there is more than enough braking ability to handle the load. Items like an exhaust brake are a luxery on a light duty truck IMO.
But I would like more than just yes: real experience (from people towing more than 12k) or the numbers such as Torqushift and 6.0l will provide 100 lb-ft (put right number) of braking torque at 3000RPM (or any other RPM). That may give us idea how much work (or energy) brakes need to absorb
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Originally Posted by Rick Braden
Would someone explain what a 6% grade relates to. Would that be 6 degrees slope? Thanks, Rick
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Joined: May 2004
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From: The Great White North
Originally Posted by milan
I agree with you. All data that I have seen are that ’05 (not ’04) 6.0 is the best choice for heavy towing. If I leave in place far from Rockies I would be probably perfectly happy. Going once or twice across the big hill will not be an issue. But that is not case and if Ford dealer says no to exhaust brake then I need to reconsider if it is worth to lose warranty and buy Ford.
Cargo Master
Joined: Jun 2003
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From: Carlsbad, California
Originally Posted by Rick Braden
Would someone explain what a 6% grade relates to. Would that be 6 degrees slope? Thanks, Rick
A 6% grade would have an angle of 3.434 deg. A 100% grade would have an angle of 45 degrees, i.e., arctan(5280/5280) = 45 deg.
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From: S.W. Michigan
Road Grade
100% grade is a 45° angle
The steepness of a road is generally measured in % grade, which in
mathematical terms is the slope, or TANGENT of the angle, measured
from the horizontal. This is the ratio of elevation change per
horizontal distance traveled, often called "rise over run". Typically
a road that rises 1-in-10, is otherwise called 10% grade.
But a 10% grade does not mean a 10° angle. The relationship is not linear. It is close to linear under 10° but then diverges after that. A 6% grade or 6 feet rise per 100 feet traveled is a 3.43° angle and a 20% grade is an 11.3° angle.
Edited to add: Dang, I need to type faster, sorry for the repeat info.
The steepness of a road is generally measured in % grade, which in
mathematical terms is the slope, or TANGENT of the angle, measured
from the horizontal. This is the ratio of elevation change per
horizontal distance traveled, often called "rise over run". Typically
a road that rises 1-in-10, is otherwise called 10% grade.
But a 10% grade does not mean a 10° angle. The relationship is not linear. It is close to linear under 10° but then diverges after that. A 6% grade or 6 feet rise per 100 feet traveled is a 3.43° angle and a 20% grade is an 11.3° angle.
Edited to add: Dang, I need to type faster, sorry for the repeat info.
Last edited by laredo7mma; Nov 2, 2004 at 10:34 AM.
