Duramax Question - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 10 (permalink) Old 11-30-2006, 01:45 AM Thread Starter
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Duramax Question

Hey guys, I have a quick question I know you Chevy guys can answer for me. How do you distinguish between the LLY and the LBZ? Is one just newer than the other, or is it an option? I don't work on many Duramaxs' and I am curious for future reference. Thanks for any help guys, Ryan.

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post #2 of 10 (permalink) Old 11-30-2006, 02:03 AM
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Look at he VIN for one. 8th digit is the engine ID.

1 - LB7
2 - LLY
D - LBZ

The engine year splits are thus:

2001 - 2004.5 - LB7
2004.5 - 2005 - LLY (1st Gen)
2006 - 2006.5 - LLY (2nd Gen)
2006.5 - 2007 - LBZ
2008 - ?????? - LMM

The 2006 LLY and the LBZ are pretty much the same engine. It is surmised that the only real difference between them is programming.
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post #3 of 10 (permalink) Old 11-30-2006, 04:19 AM Thread Starter
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Thanks for the detailed info, this really helps out.

2005 Dodge 3500 CC LB 5.9 48RE Smarty 5" Silverline Exhaust AFE Stage 2 305/70/17 Nitto Grapplers Tinted Windows
Putco light bar
1968 Corvette Coupe 5.9 cummins 47RH with Goerend parts assembled by Gilmore Performance 180 pump built by Smokem 12pt cage Ford 9" with spool 35 spline moser axles pro gears Quick Time DOT drag slicks tilt front end soon to get paint and more air.
1995 F-350 Crew Cab soon to be 6 door DRW Hauler project: 5.9 conversion in progress ZF5 speed destroked adaptor plate King pin D60 3.55 gears


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post #4 of 10 (permalink) Old 12-03-2006, 04:44 AM
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Some specs are

LLY: 310 HP 590 Tq

LBZ: 360HP 650 tq

I also think LBZs use different pistons, which are very popular among high performance guys. There are other things too. Very very quite too, I'd say under 70 db at idle.

2001 Chevy SB/CC Duramax LB7

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Engine is apart and in the garage
Goal is to have it done by the end of this summer.
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post #5 of 10 (permalink) Old 12-03-2006, 12:28 PM
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Dieselson...do you know of anyone whos torn apart a 2006 LLY? Since I'm one of those people that think the only diff between the LLY and LBZ in 2006 is the prgramming, I think it would be interesting to see if those pistons and rods were the same.
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post #6 of 10 (permalink) Old 12-06-2006, 01:03 AM
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Well, I'm not exactly sure about the pistons thing, they could be the same for all I know. All I know is that LBZ pistons are what all the high performance guys use, and I don't usually hear about LLY pistons being used.

2001 Chevy SB/CC Duramax LB7

Garrett GT4088R from PPE, PPE Duel fuelers, PPE Tuning, PPE stage 4 transmission w/suncoast 1056 converter, PPE Lift pump, Fabtech tie rods, Black Eagle alloys.
Engine is apart and in the garage
Goal is to have it done by the end of this summer.
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post #7 of 10 (permalink) Old 12-06-2006, 01:55 AM
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The engine for the 06 is the same regardless of how its labeled. The mechanicals are 100% identical. The ONLY diff is the tuning in the computer.

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post #8 of 10 (permalink) Old 12-06-2006, 04:01 PM
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Thanks eric, so if I used 06' LLY pistons, it would be the same as using LBZ pistons?

2001 Chevy SB/CC Duramax LB7

Garrett GT4088R from PPE, PPE Duel fuelers, PPE Tuning, PPE stage 4 transmission w/suncoast 1056 converter, PPE Lift pump, Fabtech tie rods, Black Eagle alloys.
Engine is apart and in the garage
Goal is to have it done by the end of this summer.
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post #9 of 10 (permalink) Old 12-07-2006, 01:36 AM
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Yessir

Eric Merchant
www.Merchant-Automotive.com
Zeeland, MI
1-866-399-7169
ASE/GM Master Certified
AC Delco Independent Repair Center
Authorized Suncoast dealer/installer
State of Michigan Licensed Repair Facility
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post #10 of 10 (permalink) Old 12-07-2006, 01:47 PM
 
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Quote:
Originally Posted by dmaxalliTech
The engine for the 06 is the same regardless of how its labeled. The mechanicals are 100% identical. The ONLY diff is the tuning in the computer.
Thanks:Thumbup: Learn something new everyday! Should make 06 LLY/LBZ tuning on EFI interesting.
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