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As I metioned in another post, I am new to Diesels. What are the major differences between the 2006 LLY versus the LBZ? I know about the extra 50 horses and torque, but what else? I'm haveing a problem finding this information.

The truck I want, feature wise, is down the street, and they are willing to deal below the new invoice price that came out today. The issue is it has the 06 LLY. All of the LBZs around me have $2,000 more in options, and I really don't want to fork $2,000 more in options + the extra $1,000 in rebate difference.

Thanks all!!!!!
 

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Can't go wrong with either. If it's what you want at the price you want, don't look back. Drive both, and make your decision. LLY still has a better rebate, too...
 

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I have an 06 LLY and I am very happy with it. It is my understanding that the LLY and LBZ have the same ecm and the bully dog programmer brings the LLY up to LBZ ratings + the intended hp increase. At least that is what has been reported on this forum from someone who called Bully Dog. In other words at any level with a programmer, they are running equal horse power. I am not sure if the LLY is exactly the same engine though - This might be worth more research if you are concerned.
 

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As I metioned in another post, I am new to Diesels. What are the major differences between the 2006 LLY versus the LBZ? I know about the extra 50 horses and torque, but what else? I'm haveing a problem finding this information.

The truck I want, feature wise, is down the street, and they are willing to deal below the new invoice price that came out today. The issue is it has the 06 LLY. All of the LBZs around me have $2,000 more in options, and I really don't want to fork $2,000 more in options + the extra $1,000 in rebate difference.

Thanks all!!!!!
The 2006 LLY and LBZ are the same engine with the same componants.
The part numbers for the engines are the same.
Only difference is the calibrations
 

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Lly Vs Lbz

OK FROM WHAT I JUST READ AT THE OTHER THREADS. SAME MOTOR. PROGRAMING IS DIFFERENT. IAM GETTING READY TO GO GET A NEW TRUCK. WHATS THE PRICE DIFFERANCE. LLY VS LBZ. ALL BET A CHIP IS CHEAPER. :eek:
 

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Different pistons?
 

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why would it be that same engine but the LLY has a detune that doesn't make sense to me because why not just make them all LBZ then if it is the same engine and everything, but i think it is the old LLY engine but just a different computer
 

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its not the same engine... read the posts from that link posted above and you'll find internal part changes, computer changes, compression changes, etc... the LLY and LBZ have the same block, same computer, similar programming, but have different block internals.
 

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that is what i thought so they are 2 different engines all together because it didn't seem right to have the same engine but witha deturn and if thet was the case people could find some way to just put the LBZ tune in the LLY computer and they would have the LBZ i dont think gm would like that to much just my 2 cents
 

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I had read that the blocked was beefed up also, for a stronger bottom end.
 

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Here is a good article on the change....

PONTIAC , MICH. – Later this year, GM Powertrain will introduce a new 6.6L Duramax 6600 turbodiesel V-8 (RPO LBZ) for the 2006 model year Chevy Silverado HD and GMC Sierra HD with class-leading horsepower – 360 (268 kw) at 3200 rpm and class-leading torque, at 650 lb.-ft. (881 Nm) at 1600 rpm. In addition to the power increase in the Silverado and Sierra, all 2006 Duramax engines have been significantly revised to deliver lower emissions and significantly improved quietness and smoothness in every application.

The 2006 Silverado HD and Sierra HD with the Allison 6-speed automatic transmission will be equipped with a significantly revised 310 horsepower Duramax 6600 (LLY) through the third quarter of 2005. It will be replaced in these applications in the fourth quarter of 2005, by the higher output, 360-horsepower Duramax (LBZ).

“The introduction of the Duramax diesel in 2001 represented a significant evolution in North American diesel pick-up truck market and propelled GM’s heavy duty diesel pick-up truck market share to over 25 percentage points,” said Charles Freese, GM Powertrain executive director, diesel engineering. “The introduction of the improved, 2006 Duramax turbo diesel once again sets a new benchmark to which all others will be measured.”

The Duramax 6600’s horsepower and torque increase and emissions reduction are enabled by a strengthened iron cylinder block and a lower compression ratio. The lower compression reduces stress on the engine by reducing the peak cylinder firing pressure. This, in turn, allows more fuel to be burned – more fuel means more power – while the lower compression helps reduce NOx emissions. Lower compression also helps reduce noise and vibration, making the all variants of the 6600 a quieter and smoother engine.

A revised variable-geometry turbocharger also enhances the driving experience of the Duramax 6600. Aerodynamic changes to the turbo’s vanes help tailor controlled application of turbo power for seamless and immediate response at full throttle. The turbo, which spins at up to 120,000 rpm, is high-speed-balanced, reducing vibration and resonance – and contributing to the engine’s overall smoothness and refinement. The revised turbo also helps reduce emissions, while maximum boost remains at 20 psi.

Another new feature of the Duramax 6600’s turbo system is the capability of the variable-geometry turbocharger to provide exhaust braking. This function is available on some medium-duty truck models and can replace add-on exhaust brake hardware. With the new system, braking is controlled by a signal from the engine controller and can be activated by the driver.

The Duramax 6600 also has a new intake air heater to reduce smoke and emissions during cold or light-load driving. The system features a 1000-watt grid heater located in the air intake duct, which is triggered automatically by the engine controller. It heats up the incoming air to speed warm-up of the engine.

In addition to 50 more horsepower and 45 more lb-ft of torque in the Silverado and Sierra, changes to the 2006 Duramax 6600 build on a host of improvements introduced for ’05 – improvements that bolstered an already strong foundation. The Duramax 6600 features a rigid cast iron cylinder block with induction-hardened cylinder bores; four-bolt, cross-drilled main bearing caps; forged steel, nitride-hardened crankshaft; aluminum pistons with jet-spray oil cooling; aluminum cylinder heads with four valves per cylinder; integrated oil cooler and a charge-cooled turbocharging system. Features, such as easy-access fuel filter and timing gears, reduce maintenance time and effort.

A new, 32-bit E35 engine controller monitors and adjusts the engine’s operation. Designed exclusively for the Duramax diesel engine, the controller helps the injectors precisely meter fuel to the cylinders and can compensate for the variability of the injectors and fuel flow. This sophisticated, more powerful controller also can support up to five injections per cylinder and eliminates the need for an engine-mounted drive unit to fire the fuel injectors.

The new Duramax 6600 in the Silverado and Sierra heavy-duty pick-ups will be available exclusively with the new Allison 1000 6-speed automatic transmission, featuring class-first features, like tap-shift range selection mode.
 

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The '06 LLY and the '06 LBZ are NOT the same. Although, '06 LLY owners try to make people believe that the '06 LLY is just a detuned '06 LBZ. NOT TRUE!! Two different engines!!
 

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'06 LLY is totally different from '05 LLY, that is true.

'06 LLY has more in common with '06 LBZ than '05 LLY.

It has the new intake design (not just the airbox, the whole intake from turbo to head was redesigned).
It has the higher injector rail pressure.
The '06 LLY is much quieter than the '05.
The '06 LLY and LBZ have the same turbo (ask McRat, he put one on his '05 LLY).
It has the reduced compression, meaning that it has the LBZ pistons.
If the LBZ piston has an increased wristpin diameter, then it stands to reason that the '06 LLY also has the LBZ rods.

This brings us down to two things.... programming, and block machining.
Programming is a given.... it's obvious that the factory programming is different. Yes, the same Bullydog downloader works on the '06 LLY and LBZ.... I have one and it works fine. The computers and electroncis are identical.

The BLOCK is the same part. A new block casting is a major investment (millions). The differences in machining CAN be very simple. For one example, if a clearance hole is needed and in one engine it is 0.500, but the actual REQUIRED clearance is only 0.250, if block "B" is drilled to 0.300, then the strength of the block in that area has been increased.

I'm not saying that this definitely IS what was done on the LBZ, but it is a good possibility.
 

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The Duramax 6600’s horsepower and torque increase and emissions reduction are enabled by a strengthened iron cylinder block and a lower compression ratio. The lower compression reduces stress on the engine by reducing the peak cylinder firing pressure. This, in turn, allows more fuel to be burned – more fuel means more power – while the lower compression helps reduce NOx emissions.


I read that as...the LBZ has higher hp and tq BECAUSE its different in THESE ways... I still dont understand it tho.
 

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I really want a CANdi module (too bad theyre 600 dollars)...Im curious to look at some things/parameters with the Tech 2 on a new LLY and LBZ...

--Ben
 

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Here we go:
http://media.gm.com/servlet/GatewayServlet?target=http://image.emerald.gm.com/gmnews/viewmonthlyreleasedetail.do?domain=3&docid=16955

Specifically, note that the compression is listed at 16.8:1, covering all of the models ranging from the LBZ all the way down to the 250hp LLY model used in the vans.

Also, from the thread cited above:
http://www.dieselplace.com/forum/showthread.php?t=55746&page=5
Eric has two blocks on his bench.... no difference that he can find.

The moral of the story, as I'm reading it.... don't be too overconfident in pushing the HP on either the LBZ or LLY, but no matter what you do, the stock Allison is still the weak link, especially now that we're pushing over 350hp stock with the LBZ.
 

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The '06 LLY and the '06 LBZ are NOT the same. Although, '06 LLY owners try to make people believe that the '06 LLY is just a detuned '06 LBZ. NOT TRUE!! Two different engines!!
Then why does GM, in every list of specifications I have read, show that the 06 LLY and LBZ both have 16.8:1 compression?
 

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Then why does GM, in every list of specifications I have read, show that the 06 LLY and LBZ both have 16.8:1 compression?
Because we like to think that our $50k bought more than it did last year, and the guys with LBZs like to think that their $52k bought more than we bought with our $50k ;)
 
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