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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY.

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Old 08-06-2019, 12:16 PM   #11 (permalink)
tork
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Yes the mileage increase is the real deal. I entered tire size in the PPE and my speedo is spot on according to my GPS. Last I checked I got 16.4mpg. Before the tire change I was at 13.3mpg. Certainly not a scientific mpg study (due to uncontrolled variables such as weather, terrain, etc.), but a legit increase nonetheless. I went from Nitto Grapplers to Michelin LTX Defenders.

I drive the LBZ easy, and keep my foot out of the throttle so I'm not concerned about the transmission or engine taking a dump, and I only have 77k miles on her.
And as far as the home equity loan... not necessary.

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Old 08-06-2019, 02:03 PM   #12 (permalink)
D_R_C
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Ok

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Old 08-06-2019, 09:53 PM   #13 (permalink)
Pure Diesel
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Quote:
Originally Posted by tork View Post
Just replace the oiled K&N with the new Amsoil paper filter, and leave the K and N box and tube, correct?

Well, I've got a bunch to learn! Not sure I understand...Are you saying the PPE is ineffective if there is no CAT? If I crank the PPE to the highest setting there seems to be a huge difference in power.

I read that running the PPE on the LBZ at setting 90hp will deliver better fuel economy than stock. That's what I've been running (not the lowest setting as I initially thought), but I'm not sure it really helped. The biggest difference in fuel economy happened when I dumped those 275-70-18 Nitto tires for 235-85-16. Yep, you read that right...skinny tires, but they are perfect for my application and I gained an easy 3mpg over the larger tires.
I will a test to the tires making a big difference. When I had the original LB7 motor in and the stock 245/75-16 tires, I would get 23 mpg HWY. I just did the same trip with the LBZ motor and 285/75-16 tires and I got 19 MPG. Give or take 65-70 MPH. Now I also know the LB7s do get better mileage.
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Old 08-12-2019, 11:37 AM   #14 (permalink)
steakman
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Hmm.. You're in alaska eh.?

Not quite on topic, but I might consider a trans fluid swap...to Transynd. Good to -61C
where if and I say "if", your current fluid is still what GM puts in the allsion- Dex 6.? Said fluid is only good to -35C. if it is, I would highly recommend changing it out over a couple of dumps/fills to at least get the overall up to say 75-85% Transynd.

Transynd is RECOMMENDED by Allison as one of a cpl of TSE295 type fluids for the Ally 1000. DEX VI is crap for those of us in Colder climates.

As for filters. I too ran an Afe...but read spicers report and went back to the Donaldson Paper type filter....back in ~2008. Have not regretted that decision. Where it me.?, I'd keep an eye open for a stock air box and go bk to using stock filters.

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Theo
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Last edited by steakman; 08-12-2019 at 11:41 AM.
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