? Does anyone know why ?

[Thrust_Titan]

Does anyone know why the horsepower and torque are deferent?

USA

NISSAN TITAN

Engine type 5.6-liter (5,552cc) V8 VK56DE
Horsepower 305 hp @ 4,900 rpm
Torque 379 lb-ft @ 3,600 rpm


INFINITI QX

Engine type 5.6-liter (5,552cc) V8 VK56DE
Horsepower 315 hp @ 4,900 rpm
Torque 390 lb-ft @ 3,600 rpm

NISSAN ARMADA

Engine type 5.6-liter (5,552cc) V8 VK56DE
Horsepower 305 hp @ 4,900 rpm
Torque 385 lb-ft @ 3,600 rpm



MIDDLE EAST

INFINITI QX

Engine type 5.6-liter (5,552cc) V8 VK56DE
Horsepower 340 hp @ 4,900 rpm
Torque 57.1 kg-m @ 3,600 rpm
or
Torque 383.694 lb-ft@ 3,600 rpm


NISSAN ARMADA

Engine type 5.6-liter (5,552cc) V8 VK56DE
Horsepower 340 hp @ 4,900 rpm
Torque 57.1 kg-m @ 3,600 rpm
or
Torque 383.694 lb-ft@ 3,600 rpm

[goathead]

this has been brought up before, but i think the general concensus was that it was do to timing and premium fuel.

[gr8titan]

I'm just making an educated guess here where the bottom line is Money:
With less concern for emission standards and saving a couple hundred dollars per vehicle, I am guessing that the increased HP in those non-US vehicles are due to the elimination of power robbing emission equipments.

[92TripleBlack]

Originally Posted by Thrust_Titan

Does anyone know why the horsepower and torque are deferent?

USA

NISSAN TITAN

Engine type 5.6-liter (5,552cc) V8 VK56DE
Horsepower 305 hp @ 4,900 rpm
Torque 379 lb-ft @ 3,600 rpm


INFINITI QX

Engine type 5.6-liter (5,552cc) V8 VK56DE
Horsepower 315 hp @ 4,900 rpm
Torque 390 lb-ft @ 3,600 rpm

NISSAN ARMADA

Engine type 5.6-liter (5,552cc) V8 VK56DE
Horsepower 305 hp @ 4,900 rpm
Torque 385 lb-ft @ 3,600 rpm



MIDDLE EAST

INFINITI QX

Engine type 5.6-liter (5,552cc) V8 VK56DE
Horsepower 340 hp @ 4,900 rpm
Torque 57.1 kg-m @ 3,600 rpm
or
Torque 383.694 lb-ft@ 3,600 rpm


NISSAN ARMADA

Engine type 5.6-liter (5,552cc) V8 VK56DE
Horsepower 340 hp @ 4,900 rpm
Torque 57.1 kg-m @ 3,600 rpm
or
Torque 383.694 lb-ft@ 3,600 rpm

The Titan has different numbers from Armada due to different exhaust routing. The computer, motor, etc. are the same.
The Middle East ones use a different rating system. Power/Torque is the same.

There has been some debate on the QX56 vs Armada. One camp has said the computer has different mapping and programing.

The other camp says it is an intelligent computer that adjusts to octane ratings using knock sensors,etc. QX56 is rated using premium, Armada using regular. This gives the Infiniti guys a marketing edge.

The edge is offset by the additional weight of the QX and as a result they are rated the same speed wise.

I'm with the second camp but I'd love it if someone could give me definitive proof.

So bottomline, they are all virtually identical and the body style/rear, etc. will make the real difference.

[Sammy Sandbag]

I think I read somewhere a while ago that the QX56 has a slightly higher compression ratio, therefore it requires high octane and has higher HP/Torque numbers.

[Armada]

Thrust_Titan: Consider doing a search. There is a ton of stuff on this topic here. I'll summarize and ya'll correct me if I mess up.

1. The overseas models are not rated at SAE Net numbers, as we use here in the US. They use SAE gross. If you read the fine print on the specs you will see that. They work out to be the same when you use the correction factors.

2. Infiniti's QX-56 rates its numbers with premium fuel. There is a lot of pretty sophisticated data here from testing by some of our engineering savvy members, pointing out that if you run premium in your Titan (especially 93), our ECU's are of the new generation "smart" design which will continue to advance timing until knock is detected. This will produce 10 more horses and 10 more pounds of torque. You end up with the same numbers as the QX-56.

3. Run regular in the QX-56 (it is fine to do so), and you get our horsepower numbers.


4. Any differences in the exhaust systems between the Titan and the Armada/Infiniti are so minor in performance as to be within the range of testing errors. Both body styles, whether pick up or SUV are essentially producing identical 0-60 and quarter mile times.

5. At least one Nissan engine engineer who is a regular member of this site has confirmed anonymously to me that the Titan, Armada and Infiniti engines all go down the same assembly line at the Tennessee engine plant, all receive the same parts, the same machine work and the same assembly and use the same ECU. Compression ratios are all the same.

There is no difference in the engines and no meaningful difference in the exhaust systems, although the cat-back parts of the systems may vary slightly due to the different wheel-bases of the vehicles.