Quick Answer

Question How much horsepower does a 2004 6.6 Duramax have?

300 Horsepower @ 3,100 Rpm

Year(s) Horsepower: Torque:
2001-2003 235 Horsepower @ 2,700 Rpm 500 LB/FT @ 1,600 Rpm
2004 300 Horsepower @ 3,100 Rpm 520 Lb/Ft @ 1,800 Rpm

What is so special about the LB7 Duramax?

The LB7 Duramax diesel is a direct-injected, turbocharged, intercooled, four-valve-per-cylinder V-8 that produces 300 hp and 560 lb-ft of torque. Starting from a blank sheet of paper, the 6.6L Duramax is recognized to date as the fastest diesel development program in the world.

Why is the Duramax exhaust tip vented?

Registered. If your are still emissions compliant then get the vented one. It does help reduce the gas temperature that exits the tailpipe. The truck itself won’t know the difference, but anything around you when the truck goes into regen will absolutely know the difference.

What year Duramax has exhaust brake?

What Year Duramax Has Exhaust Brake? For the 2011 model year, GM and Ford have added exhaust brakes.

Which is better LB7 or lly?

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.

What does LLY stand for on Duramax?

LLY doesnt stand for anything specific, its just the RPO (regular production order) code that means “Duramax diesel engine”.

How much horsepower can a LB7 handle?

Couple that with a weaker connecting rod and you can draw a pretty strong conclusion as to why the LB7 rods fail in the 550 to 600 hp (1,100 to 1,200 lb-ft.) range. While we tend to talk in terms of horsepower, it’s the torque of these engines that does all the damage.

How long will LB7 last?

As we said earlier, the LB7 powered HD Sierras and Silverado’s are very reliable, and many you’ll find on the market have well over 300,000 miles on the original engine.

What Turbo does the LB7 have?

With these modifications taken care of, the real performance-limiting factor with the LB7 Duramax is the factory IHI turbocharger. While the stock turbocharger can support up to 530 horsepower relatively safely, EGTs can get quite hot, and the stock compressor wheel will start pushing past its efficiency range.

Why do diesels have weird exhaust tips?

Registered. It’s for trucks with a DPF diesel particulate filter. In order to empty the filter, which is filled with soot, it burns at 1000 degrees, so you can imagine the exhaust temps get hot, and as the exhaust passes by those holes, it sucks cold air in and mixes with the hot air to cool it down.

Why do exhaust tips have holes in them?

Drilling holes in your exhaust will definitely make it sound louder. This is because some of the sound waves will be able to escape to the atmosphere before they could be silenced by the muffler. This will cause your car not just sound louder but it will also sound more aggressive.

Is Duramax a Japanese engine?

Duramax is a family of 6.6L diesel engines designed by General Motors. They are produced by the Ohio-located diesel manufacturer DMAX, which itself is a joint venture between GMC and Isuzu, a Japanese vehicle and diesel engine company.

Do exhaust brakes hurt the engine?

The answer is yes – exhaust brake is not harmful to the engine at all. It is even recommended for truckers to have an exhaust brake. Mostly because trucks are heavy and need a lot of stopping power to make a full stop – especially during downhill.

How does exhaust brake work on 6.6 Duramax?

Hence, the device is called an “exhaust brake”. Such a device almost completely closes the engine’s exhaust when the foot throttle is fully released, creating a pumping restriction to generate engine braking. It does this by placing a shut-off valve, called a “butterfly valve”, in the exhaust system.

What’s better LBZ or LB7?

The LB7 – stronger internals, injector issues, and 5 speed trans. The LLY – stronger internals, headgasket/overheating issues, but no injector issues, and 5 speed trans. The LBZ – weaker internals (pistons are weaker), but no injector/overheating/headgasket issues. Also get the 6 speed.

How do I get more power out of my LB7?

If you want to improve performance, an aftermarket cold air intake can provide pretty solid gains for a cheap price. Aftermarket cold air intakes like the LB7 Duramax Banks Power Ram Air System provide the engine with cooler, denser air which results in more power.

What year was LB7?

Duramax LB7 (2001-2004 Chevrolet Silverado HD and GMC Sierra HD)

Why is LBZ better than lly?

However, the LBZ generated 360 horsepower over the LLY’s 310 horsepower. Torque increased as well, going from 605 pound-feet with the LLY to 650 with the LBZ. The LBZ employed a thicker engine block casting, meatier connecting rods, and a higher pressure common-rail fuel system.

How long will LLY Duramax last?

The Duramax engine should last up to 300,000 miles before needing major repairs if you are wondering how long it will last. The number of miles an engine can run depends on how well it was maintained and driven over its lifetime.

How long do LLY injectors last?

Redesigned Injectors

Most well-maintained LLY injectors last between 150,000 to 200,000 miles.

Are lb7s fast?

Motor work it is a very fast truck the lb7 is the fastest motor of all the duramax motors.

How much boost does a stock lb7 Duramax make?

Depending on stock wastegate condition, with a boost valve it will allow 32-33.

How much HP can a 2.8 Duramax handle?


Engine 2.5L I4 2.8L Duramax® Turbo-Diesel
Horsepower 200 HP 181 HP
Torque 191 lb.-ft. 369 lb.-ft.
MPG 20 city/26 highway 30 highway
Payload Capacity 1,710 lbs. 1,506 lbs.

What goes wrong with LB7 injectors?

When an LB7 injector fails, it can dump an enormous amount of excess fuel into the engine, often at very low speeds (such as idle, for example). When this happens, the extra fuel isn’t burned
it seeps into the oiling system and thus starts filling the engine with diesel fuel.

What problems do LB7 Duramax have?

The fuel injectors in the LB7 engine have a design flaw that causes them to fail. Signs you’re truck is suffering from this flaw include a misfiring engine, rough idling, acceleration and performance issues, and error codes that indicate the fuel mixture is too rich or too lean.

Is the 3 liter Duramax good?

Efficient and Capable. Offering up to an EPA estimated 30 MPG highway, the Duramax 3.0L Turbo-Diesel not only gives you a highly efficient truck, but it is also perfectly suited for off-road adventurers with its powerful 460 lb-ft of torque and best-in-class 277 diesel horsepower.

How can I make my LB7 turbo louder?

Registered. A intake, resonator being removed may make It a little louder. If the lb7 has a silencer ring in it like the Cummins turbos you can remove it also. You have a fixed vane turbo on your truck so it won’t whistle at idle like the llys and up.

Can you put a lly turbo on a LB7?

The LB7 ECM has no way to control the LLY turbo.

Can you put a LBZ turbo on a LB7?

You cant put a VGT turbo on an LB7 truck without some sort of controller. The turbo brake is not the same thing as a stand alone VGT controller. The turbo will work, but the vanes will be stuck in one position.