What happens when an unstoppable force meets an immovable object ...? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 22 (permalink) Old 02-11-2010, 07:11 PM Thread Starter
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What happens when an unstoppable force meets an immovable object ...?

There is an article in the Chevy section about Chevy claiming 680 miles (city/hwy mix) on a 36 gallon tank that is now standard on lwb or swb duramaxes. That is 18.8 mph. They also claim that only 3.73's or 4.10's are axle ratio options. The point I'm getting at here is we are looking at a 6.6L V8 DI COMMON RAIL diesel with a VGT turbo and peizo injectors... I can't imagine ford got all that much more power out of the 6.7 Power Stroke if any at all over the new Duramax. So was Ford's choice of going with 3.55's a smart move in regards with towability? Unless they are expecting to get more than 18.8 mpg using the taller gears and really making it worth having less power to the ground I don't see how a 6.7L could tow up a hill better with 3.55's or higher than a Duramax with 4.10's or even 3.73's.

Chevy might be the new tow king... Ford on the other hand may have the fuel economy edge. Now if the CGI block, reverse heads, and twin scroll turbo really give the gains that they should Ford just might pull it off...

This is going to be the most interesting match up since diesel pickups came out. The truck testers/reviewers are going to have a field day. Especially now that the new Chevy has a FULLY BOXED FRAME, 14" BRAKES, EXHAUST BRAKE, 3" WIDE LEAFS, & TRAILER SWAY CONTROL!!!
2011 Chevrolet Duramax 6.6L vs 2011 Ford Power Stroke 6.7L

please don't turn this into a troll fest or a brand bash, just civil conversation between diesel enthusiasts... Either way with all this competition we all are the winners!!!

Last edited by Jeremiah; 02-11-2010 at 07:14 PM.
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post #2 of 22 (permalink) Old 02-11-2010, 08:34 PM
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I hear what you are saying, but I don't know if you can go just by the differential ratio when assessing towing capability. I actually do think the new 6.7 will pull a bit more power out anyway. So, even if all was equal in the drivetrain, truck weight, wheel height, trans gears, etc., an engine making 400HP would be able to turn 3.55's about the same as a 380HP engine turning 3.73's. It's only a 5% leverage difference.

But I also think there are differences in the trans gearing and the other factors I mentioned. When it is all said and done, I would not bet against the new Ford. I agree it will be interesting, but Ford has definitely set a new height for the bar. Let's see where the others end up.

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post #3 of 22 (permalink) Old 02-11-2010, 09:54 PM
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bottom line... consumer wins. IF he is willing to pay the money.

Closing in on 50K for the low end truck with a diesel.

Life changes, so roll with it, not against it.
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post #4 of 22 (permalink) Old 02-11-2010, 11:52 PM
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i see a lot of complaining about the new gear ratio selections in the rear end. you do realize, that w/ the new transmission, the 3.31 rear gear is [effectively] lower than the 4.10 rear and last years Torqueshift.... right?

the previous TS's have a 3.11 first gear. the new tranny has a 3.97 1st. so, compared to the previous first gears, the 3.31 is equivalent to a 4.23 rear and the 3.55 ratio is equivalent to a 4.53 gear.

so i've seen a lot of unfounded complaining when the whole picture isn't realized....

the math:

Effective ratio (compared to previous) = [ratio x new TS 1st] / old TS 1st

so, for 3.31 rear gear, effective ratio = [3.31 x 3.97] / 3.11 = 13.14/3.11 = 4.225
and for 3.55 rear gear, effective ratio = [3.55 x 3.97] / 3.11 = 14.09/3.11 = 4.532

this means you have fantastic towing power in lower gears and fuel sipping rpms in the higher gears. this new trans has me excited.....

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post #5 of 22 (permalink) Old 02-12-2010, 04:38 AM Thread Starter
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Quote:
Originally Posted by mudguppy View Post
i see a lot of complaining about the new gear ratio selections in the rear end. you do realize, that w/ the new transmission, the 3.31 rear gear is [effectively] lower than the 4.10 rear and last years Torqueshift.... right?

the previous TS's have a 3.11 first gear. the new tranny has a 3.97 1st. so, compared to the previous first gears, the 3.31 is equivalent to a 4.23 rear and the 3.55 ratio is equivalent to a 4.53 gear.

so i've seen a lot of unfounded complaining when the whole picture isn't realized....

the math:

Effective ratio (compared to previous) = [ratio x new TS 1st] / old TS 1st

so, for 3.31 rear gear, effective ratio = [3.31 x 3.97] / 3.11 = 13.14/3.11 = 4.225
and for 3.55 rear gear, effective ratio = [3.55 x 3.97] / 3.11 = 14.09/3.11 = 4.532

this means you have fantastic towing power in lower gears and fuel sipping rpms in the higher gears. this new trans has me excited.....

Excellent point of view and good info. Thanks for contributing.
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post #6 of 22 (permalink) Old 02-12-2010, 01:06 PM
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Thanks....that is what I said above re:trans gearing being different.

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post #7 of 22 (permalink) Old 02-12-2010, 02:53 PM
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I have heard from an inside source working on the 6.7L truck project that they are getting in the low 20's for mileage. If this is the case, just as I said about the DMAX it is excellent news. I just hope those numbers come to realizatio nwhen they hit the consumers.

I really am interested in the new 6.7L and the new Dmax, since I have a feeling it's one of those that I will be getting in the next couple years, although I have no plans on selling my LBZ.

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post #8 of 22 (permalink) Old 02-12-2010, 04:58 PM
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Does the 3.31 rear end with the new transmission gearing equal the 3.73 with the old the transmission for final out put ??
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post #9 of 22 (permalink) Old 02-12-2010, 10:28 PM
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The 3.31 is better (much better) leverage, as mudguppy laid out, it would be like a 4.23 in the 2010's and before.

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post #10 of 22 (permalink) Old 02-13-2010, 04:09 AM
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All those 3.53 and 3.31, gear ratios that is great, now with it having, I believe a .67 sixth gear and say LT 265 70R 17 tires, what RPM would you turn at say 70 mph or 110K. I have a duramax and those size tires and a 3.73 ratio and I am doing 1510 RPM at 110K, in sixth. 3.53 would give you 116K, and 3,31 would give you 124 K at the same RPM. It will be interesting! Both units sound like winners, and that would be great, In 2012 is when we will know who has the right combination.

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