QX56 vs. Titan

[QShip]

The standard 5.6-liter DOHC Endurance V8 produces 315 horsepower and 390 lb-ft of torque in the QX56.

Why does the QX56 have more hp and torque? Is it just the ecu or are there mechanical reasons for the difference? If it's the ecu, would swapping a QX56 ecu with the Titan's give us those same numbers?

[Finnattic]

Originally Posted by QShip

The standard 5.6-liter DOHC Endurance V8 produces 315 horsepower and 390 lb-ft of torque in the QX56.

Why does the QX56 have more hp and torque? Is it just the ecu or are there mechanical reasons for the difference? If it's the ecu, would swapping a QX56 ecu with the Titan's give us those same numbers?

After most of the dyno's that I've seen I believe Nissan underrated the Titan anyways and those numbers are probably more on par.

[JS02]

The QX56 also requires premium fuel. There was a thread on this some time ago. It could be that the QX56 is tuned for premium fuel. Some peole feel that premium fuel gives the Titan more power. The performance numbers in tests seem to show that the Infinity may have more power than the Titan.

[MyOtherRideIsAHonda]

So is premium not required for the Titan?

I have been filling mine up with Premium just because anything high-powered and over 300hp just seems it would do better on premium? I know premium is a waste on anything that it is not required on but something like the Titan with this size motor and displacement seems like it would need premium...

[Stomper4x4]

Originally Posted by MyOtherRideIsAHonda

So is premium not required for the Titan?

I have been filling mine up with Premium just because anything high-powered and over 300hp just seems it would do better on premium? I know premium is a waste on anything that it is not required on but something like the Titan with this size motor and displacement seems like it would need premium...

Nope. It "seems" your wrong. Ok, ok.. you just flat out wrong. Do your home work. Premium isn't required or recommended and it runs 85 great at high alt.

[MyOtherRideIsAHonda]

Originally Posted by Stomper4x4

Nope. It "seems" your wrong. Ok, ok.. you just flat out wrong. Do your home work. Premium isn't required or recommended and it runs 85 great at high alt.

Premium is not recommended? This is where YOUR wrong...

No car company does not "recommend" premium, they may suggest using regular because a higher octane will not improve performance, but they would not recommend against it. All premium is is a higher cleaner burning octane, not harmful by anymeans.

Now, Im not saying its necessary to run premium on the Titan by any means, I do not run premium on my Honda (there is no point).

[Le_Titan]

Originally Posted by MyOtherRideIsAHonda

Premium is not recommended? This is where YOUR wrong...

No car company does not "recommend" premium, they may suggest using regular because a higher octane will not improve performance, but they would not recommend against it. All premium is is a higher cleaner burning octane, not harmful by anymeans.

Now, Im not saying its necessary to run premium on the Titan by any means, I do not run premium on my Honda (there is no point).

Much of the money you would spend on premium if you added it up you could get some new exhaust system to enhance fuel efficiency. Or at least buy one part of it.

[spitan_titan]

I was under the understanding that premium was required for high compression engines because of early/pre detonation. The higher octane fuels can withstand the compression without detonating prior to TDC.

If this is in fact true, and the engines are the same why would the compression on the Infinity engine be greater than the Titan 5.6L

Thanks.

[MyOtherRideIsAHonda]

Originally Posted by spitan_titan

I was under the understanding that premium was required for high compression engines because of early/pre detonation. The higher octane fuels can withstand the compression without detonating prior to TDC.

If this is in fact true, and the engines are the same why would the compression on the Infinity engine be greater than the Titan 5.6L

Thanks.

Im wondering the same thing.

[JMC]

If this is in fact true, and the engines are the same why would the compression on the Infinity engine be greater than the Titan 5.6L

Its not. Its probably just a different timing and fuel curve in the Computer that boosts the specs or Nissan had to show a power difference in the QX56 and the Armada just to make the Infinity buyers feel like they were getting something better for the extra 10k......so they just gave the Nissan Titan and Armada engine a real conservative hp and torque rating. But this is a good question because I have seen somewhere they have the Armada as having more torque than the Titan. Anyone seen this?

[QShip]

"Armada is powered by an impressive 305-horsepower, 5.6-liter aluminum-alloy V8. With an easy-breathing 32-valve double-overhead-cam design that utilizes lightweight aluminum components and a highly advanced variable intake, for instantaneous power at any rpm. Plus 385 lb-ft of torque".

Yep.

[spitan_titan]

This is a pretty good writeup in USA Today about premium fuels. http://www.usatoday.com/money/autos/...emiumgas_x.htm

[spitan_titan]

I was under the understanding that premium was required for high compression engines because of early/pre detonation. The higher octane fuels can withstand the compression without detonating prior to TDC.

I meant to say recommended, not required. Also the knock-sensors in today's engines allow to run a lower grade fuel.

[Truck41]

the reason that companies have upscale divisions, is because they tend to offer a little more lux, for people who want it. so with the higher price, comes more immenities, which may take the form of more lux, and that extry power, seperates it from the armada. most likely, it's in the ecu.

[SmokenTitan]

Be carefull if you've only been using premium...

I read somewhere a long time ago, that if you run more than 3 tanks of premium through your engine your stuck with using premium. If you switch back you'll have issues...

Not sure how true it is, but might be worth doing some homework on before you switch back to regular...