There's much more of a loss than just parasitic drag. These engines are 'torque managed' to keep from blowing the drivelines up. You rarely get anything close the figures quoted. All the manufacturers do this, and I think it's total B.S..

 

That's why I drive gas trucks. Not enough power to break stuff hahahaha

 

While this is true, it doesn't paint a complete picture. Having a nanny on a 800 ft/lb motor is < having a nanny on a 1000 ft/lb motor. So, while we may not be getting the full load at all times we are getting more than the last two generations of the 6.7 and that's what folks are excited about.

 

Why bother to engineer a massively powerful diesel engine if the transmission cannot handle it? Wouldn't it seem smart to upgrade the transmission to match?

The current 6.7L diesel supposedly puts down 860lb-ft @ 1600RPM. Why is it so hard to turn the tires by flooring the truck, then, even with traction control off? There is hardly any weight over those rear tires. Yet with our F-150, either the current 2.7L or the old 5.0L, you can effortlessly light up the rears with traction off! I would think 860lb-ft would utterly shred the tires!

Instead, you "feel" the torque surge in higher gears when already moving.

Whatever. Even though I had many reservations and second thoughts, I'm switching back to the gas truck...although even that is power-limited until a certain RPM is reached.

I have a buddy who drives a 2009 Duramax. That Allison must be one tough tranny because his truck is running a DPF and EGR delete, larger turbo, straight pipe 6" diameter, injector upgrade, and a performance tuner. He drives it hard; he lights up his rear tires almost every time he takes off, and that truck just sounds evil. The trans has not been modified and it seems to be holding up fine.

I'm not advocating driving like that, but once in awhile...

 

He is either really lucky or on borrowed time.

 

I outgrew my "burn the tires" phase many years ago. Dudes who do all that to their truck and burn up high dollar tires are compensating for insecurities.

I'm curious how many miles a year you put on a truck troverman. The list in your signature shows 4 trucks over a 6 year span? What's the story there?

 

I peel out once in awhile, just because I feel like it. But not often.

The trucks usually have about 25k when I trade. The truck I have ordered will be the last for at least 5 years. Money will not be as free flowing next year. I have been fortunate to have the other trucks.

 

Money has been pretty free flowing for me for the last 12 years, but I have bought one truck in that time, a 2005 F150. I can't imagine trading trucks after 25k miles. You must be getting amazing prices on new trucks.

 

My 15 powerstroke would spin on demand easily, very easily

 

I have both a 2004 duramax, and an 08 f-350 currently and I have to say I love that Allison! Never had a problem ever with it and I too am running a lot of upgrades to the duramax. My f350 is bone stock and the tranny shifts like crap and has half the miles as the duramax. I love the external filter on the Allison too. Servicing the ford trans sucks! You have to bring it to the dealer to flush, and my local dealer refuses to drop the pan and change the internal filter. He says ford doesn't require it. I change the spin on on my Allison every engine oil change. It's right next to the engine oil filter and is super easy, so why not!!

 

Wrong thread