LB7 vs LLY ??s For people who have had both - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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Old 02-21-2008, 07:59 PM   #1 (permalink)
scrappy35
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LB7 vs LLY ??s For people who have had both

I just purchased a 2005 GMC 3500 and sold my 2002 2500. Right away I noticed a different sound to the engine. New one is quieter and I an hear the turbo more. I also noticed when it shifts the "diesel" engine sound is a little more pronounced and it seems to de-fuel a little more. Does that sound about right?

Runs strong just a different sound to it. I assume the variable turbo has something to do with that?

Anyone notice these differences and our others.... just curious.

Shane
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Old 02-21-2008, 09:16 PM   #2 (permalink)
Rttoys
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Between the 3 LB7s I have a work and my LLY, the LB7 seems to be more 'sluggish', a bit less power and louder, BUT seem to be more of a consistant increase in power through the RPMs. My LLY, is much quieter and smoother. The power is dormant right off idle until the turbo spools, then it takes off like a rocket. It'll 'pertect' itself in a split second, when needed, though.

Both still good, just a little different.
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Old 02-21-2008, 09:53 PM   #3 (permalink)
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my LLY all day long
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Old 02-21-2008, 10:00 PM   #4 (permalink)
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I have a hard time with telling the "sluggish" part going from a 2500 SRW to a dually. Once I get a trailer behind it I will be able to tell more. Don't get me wrong, I love the truck, just some differences I noticed. It is deffinitley quieter.

Thanks for the input.
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Old 02-21-2008, 10:24 PM   #5 (permalink)
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Ill take a late lb7 over lly any day
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Old 02-22-2008, 11:59 AM   #6 (permalink)
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lly no doubt
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Old 02-23-2008, 04:31 PM   #7 (permalink)
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I have a 2002 LB7 and am getting a newer duramax. what is the better, LB7 early 2004 model or the LLY late 2004? and why? Is the power alot better? I have heard they are less reliable than mine, quieter but less reliable. Also have heard that if chipped, the LB7 will take the cake. Any insight on this question?

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Old 02-25-2008, 10:11 PM   #8 (permalink)
05'Max
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LB7 vs LLY?

I had an 04' LB7 and it seemed to have more power than my 05' LLY. Spooled up faster and would smoke the tires from a dead stand still. The only problem I had with it was that it "ticked". Yup, just like a big timex. It was very annoying especially when it was out on the road and after running at 75 or 80 mph for some time pulling in to fuel up listening to the tick,tick became too much for me to deal with. I bought a new 05' LLY and no tick any more. It was like a slug until it spooled up. Would not lite up the tires at all. I installed the Predator and it was like a whole new truck. Almost 38K now and no problems at all and very happy with it. I think you just have to mess with your truck to get it to where you wanna be and you'll be happy.
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Old 02-25-2008, 10:34 PM   #9 (permalink)
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I have both. I love my LB7, wish I had two.

LB7 gets way better fuel economy, runs cooler. I do like the automatic high idle on the LLY(with the auto start), beats walking out in the cold and flipping a switch.
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Old 02-26-2008, 11:24 PM   #10 (permalink)
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I can't believe there are only 9 posts for this thread.
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