'08 Superduty recall

   / '08 Superduty recall #121  
A couple notes about the pickup truck shootout noted by Paul: having read this several times, it appears that the trucks tested are all very equal, particularly in diesel configurations. The acceleration numbers, both loaded and unloaded are virtually equal. I am not sure what the squat test really proves, especially when we look at the difference as a function of total height. I also do not see any of these trucks "squatting" enough to deleteriously affect the handling of the truck under load. The minute acceleration differences in the trucks relate largely to their sprung weight. The combined truck and trailer weight is uncorrected, as it should be to indicate a "real world" testing. But it can produce somewhat misleading results. We should consider, at least in my old street/drag racing days recollection, that 100 pounds of chassis weight equalled roughly 0.08 seconds in the quarter mile. This was in a smaller car with a lower curb weight. I cannot attest to whether this applies to 8000# pickups, but it may come close. One can correct for that and see what the acceleration numbers would be for vehicles of equal weight, assuming equal drivetrain friction and similar brick-like aerodynamics for each. (Irrespective of gearing, also). This finding would be exaggerated in any short steep hillclimb, also, by some factor beyond my physics knowledge (I might have been able to figure this at some time in my life--just not now). This gives a better assessment of how the powertrain handles the weight of not only the trailer, but the truck as well.

John M
 
   / '08 Superduty recall #122  
John, The physics isn't unfathomable.

F = MA Is a law of physics that hasn't been repealed.

Restated (solving for acceleration):

A = F/M To get more acceleration you must either apply more force or reduce the mass (or both.)

Sorry but your "rule of thumb" from your drag days is outside of its "region of applicability." A similar rule of thumb could be derived for the trucks in question. It would be a different number but of similar usefulness.

The above is the simple view. Then there are HP and torque curves, gearing in the axle and tranny, various slippages if auto tranny, coefficient of friction for the tires on the pavement and on and on. Still, the main thing is how much force can you apply to the road and how much mass does the vehicle have. "Aye, captain Kirk, I cannow violate the laws of physics!" (At least without suffering terrible punishment.)

Pat
 
   / '08 Superduty recall
  • Thread Starter
#123  
The Ford guys always cry foul on acceleration tests against GM because their Ford trucks weigh more, then they turn around and brag their trucks are heavier duty than GM because they're built heavier.

Guess you gotta take the bad with the good.

Fords have a lot more weight on their front axle because they have iron heads, and a solid front axle with an iron differential and usually bigger tires. That's where the weight penalty comes from.

There's some days when I'd like to have either truck. Guess you pay your money and take the bad and the good from each brand.
 
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   / '08 Superduty recall #125  
Here's another unhappy Ford owner, I'm a one truck contractor I don't know what I would do while I waited to get a new engine installed.
For me it has nothing to do with brand loyalty or bragging rights, I just need to get to the job and back!!!


bad batch of cranks!!! - The Diesel Garage Forums
 
   / '08 Superduty recall #126  
I never had a bad engine in a Ford but my GM experiences have not been good. New '82 GMC 2500 with a 6.2 diesel, two blown head gaskets and 1 cracked head before it was 3 months old. Traded it for a new '82 3500 dually with a 6.2 diesel and within a year it had blown two headgaskets and cracked two heads. Traded it for a new '85 Ford F-350 with a 6.9 diesel. This truck ran over 100,000 miles before it went back to the shop for a throwout bearing.

Bought a new '83 GMC Jimmy with the 6.2 diesel. No engine problems but at 50,000 miles the transmission commited suicide. Had to buy a factory re-manufactured trans.

Bought a new '96 Tahoe with a gas 5.7 engine. Engine had a knock at idle. Dealer had to pull the engine and replace the mainbearings because one of the mainbearing cap bolts had been tightened too much and stretched causing too much clearance.
 
   / '08 Superduty recall
  • Thread Starter
#127  
JB4310 said:
..............I'm a one truck contractor I don't know what I would do while I waited to get a new engine installed.
For me it has nothing to do with brand loyalty or bragging rights, I just need to get to the job and back!!!

That's the way I started looking at it a few years back. Give me the best truck at the time I buy. Who cares what brand.

Heck, I just bought my GMC truck and I'm already taking a liking to a Dodge 3500 chassis with an Aisin and an exhaust brake. ;)
 
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   / '08 Superduty recall #128  
ME...I'm actually product neutral...I buy what's the best deal at the time...:D

Current inventory of trucks...;)
Ford F-150....about to be retired
Ford F-350 Dump
Dodge Ram 3500
Chevrolet K2500
GMC 3500 Duramax....primary tow vehicle
 
   / '08 Superduty recall #129  
I'm also product neutral on the new trucks.


There is no way I can afford one so it matters not!
 

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