Vvt?

upshift · 09-19-2006, 07:00 PM

Hi, i was just wondering if the titans from 04-06 have VVT? Thanks.

Sammy Sandbag · 09-19-2006, 07:10 PM

No..................

VShortt · 09-19-2006, 09:15 PM

Only the '07's with be available with variable valve timing.

baseballfanz · 09-19-2006, 09:29 PM

Quote:

Originally Posted by upshift

Hi, i was just wondering if the titans from 04-06 have VVT? Thanks.

Yes the 04-06 are Very Very Tough.

12glocks · 09-20-2006, 06:08 PM

I thought they had it as well being one of the ways they have all that power down low. I guess I was wrong about this.

VShortt · 09-20-2006, 07:07 PM

The power down low can be mostly attibuted to the fact that they are equipped with a five speed transmission.

ptgarcia · 09-21-2006, 04:10 PM

Quote:

Originally Posted by VShortt

The power down low can be mostly attibuted to the fact that they are equipped with a five speed transmission.

...and a powerful engine...

Armada · 09-22-2006, 01:52 PM

Quote:

Originally Posted by VShortt

Only the '07's with be available with variable valve timing.

Source of info, please?

baseballfanz · 09-22-2006, 02:00 PM

Quote:

Originally Posted by Armada

Source of info, please?

Info is all over the place, this link have a link to a video shot of the 07 engine.
We Get Some Hate>>>but What The Hell Is It???

technorev · 09-22-2006, 10:34 PM

I'm looking forward to driving one soon!

roystitantn · 10-05-2006, 11:13 AM

i can confirm the vvt on the '07. i work for Nissan and i am the process engineer over the vk56 cylinder head machining line in Decherd, TN.

miketan · 10-06-2006, 07:55 AM

Quote:

Originally Posted by VShortt

The power down low can be mostly attibuted to the fact that they are equipped with a five speed transmission.

Actually, that's not correct. The transmission really doesn't have anything to do with the total TQ output of a particular engine. The two most important factors in TQ output are attributed to the displacement size of the motor and the intake manifold runner design in naturally aspirated engines.

That's why the new Chevy Vortec 5.3L has 320hp but only a measly 335lb.ft of torque. VVT or VCT helps to keep the TQ level flatter which increases HP. However, the maximum amount of TQ that can be derived from 5.3 liters will always be less than a similar engine of larger displacement.

The intake manifold runner design is the second most important factor in torque output of a particular engine. Look at the old TPI engines from GM. Long runners that were almost 17" long. Good for TQ, but bad for HP. Those engines typically ran out of breath up top making for a rather low HP high TQ rated engine. Since the 5.6L Endurance has been designed with towing in mind, the intake manifold is probably designed with relatively long intake runners which move air faster at low rpms creating a higher TQ peak than a shorter intake runner would. Shorter intake runners would tend to stagnate the air flow at low rpms (less peak TQ) but would flow much better at higher rpms increasing peak HP.

Variable cam timing helps to bridge this gap by creating a much flatter TQ curve throughout the rpm range. More TQ and more HP. The best of both worlds. However, I'd like to see Nissan use VCT on the exhaust side as well to pump up the numbers on the Endurance even further.