Qx56 6.8 0-60

icthetitan · 06-02-2004, 08:17 AM

I was reading my new issuse of motortrend yesterday when I noticed a 6.8 sec. 0-60 mph time on the Infiniti QX56

(in a test of big luxo-utes). It was a loaded AWD model, weighing around 5600 lbs (all QX56's have the 3.36 gears).

I wonder how a loaded 4x4 crew cab titan (weighing around 5300 lbs and with the 3.36 gears) can only pull off a 7.6 sec 0-60 mph time (that is the average I have seen in most titan tests).

I know the Infiniti as 10 more hp and 11 more ft/lbs of torque, but I doubt that cuts nearly a second off a 0-60 time while carrying 300 more lbs. One thing that caught my eye though was the 6200 rpm redline. In the test stats sheet it showed a 6200 rpm redline, which I initially dismissed since the Titan and Armada have 5,600 rpm redlines (even though they can be manually shifted up to 6,200). But a photo of the dash showed the 6,200 rpm redline.

I am guessing Infiniti was able to tune in a little more high rpm power. There is a noticeable drop in power in the Titan after 5,000 rpm, and it seems to be deliberate. (I say this because aftermarket ECU tuners for my 2003 Maxima found that Nissan made the engine run rich in the last 1,000 rpm and actually doesn't allow the throttle plate to fully open at high rpm wide open throttle - all in the name of emissions and engine longevity but also kills top-end power).

Getting some more out of the endurance in the high end is the only way I can explain how the Infiniti did so well. That, or motortrend can't read their instruments, which I just can't believe because they are the most knowledgeable and qualified testers in the world.

Sorry for the long rant, I just wanna see a 4x4 crew cab titan pull off a 6.8 0-60

SupraTitan · 06-02-2004, 08:40 AM

I have no doubt the VK 56 should be able to handle 500-600 horse power at the wheels with the stock block. With the forged crank shaft and the over looked fact that this V8 has 6 main bearing caps vs. the industry standard of 5 on a V8 shows that Nissan engineered this engine to handle some serious h.p. Nissan has a history of doing this, just look at the RB26dett, 2.6L I6 that stock puts out 280h.p., tuned properly the stock block can handle over 800 rwhp.

AlexAtMyNismo · 06-02-2004, 08:56 AM

Either way, the Titan and the Armada/QX56 are all big lugs that move like compacts. I've driven the Performance Nissan Delivery Titan that has the Bank Power exhaust system on it...And WOW!!! that truck moves with such an aggessive and powerful force.

-Alex B.

TrojanDan · 06-02-2004, 08:57 AM

Quote:

Originally Posted by AlexAtMyNismo

Either way, the Titan and the Armada/QX56 are all big lugs that move like compacts. I've driven the Performance Nissan Delivery Titan that has the Bank Power exhaust system on it...And WOW!!! that truck moves with such an aggessive and powerful force.

-Alex B.

Alex, you work at performance nissan?

spartan · 06-02-2004, 01:17 PM

Quote:

I know the Infiniti as 10 more hp and 11 more ft/lbs of torque, but I doubt that cuts nearly a second off a 0-60 time while carrying 300 more lbs. One thing that caught my eye though was the 6200 rpm redline. In the test stats sheet it showed a 6200 rpm redline, which I initially dismissed since the Titan and Armada have 5,600 rpm redlines (even though they can be manually shifted up to 6,200). But a photo of the dash showed the 6,200 rpm redline.

FYI, I have a Armada built 1/20/04 and the tach has a redline of 6200, not 5600. Not sure why the titan would show a redline of 5600

Sammy Sandbag · 06-02-2004, 01:21 PM

Are you talking about the redline on the tach or the actual rev limit, the two are not always the same.

spartan · 06-02-2004, 01:45 PM

Quote:

Originally Posted by sammy sandbag

Are you talking about the redline on the tach or the actual rev limit, the two are not always the same.

I'm talking about the redline on my tach in the dash of my Armada is a 6200. FYI, when I floor it the first shift typically occurs at close to that redline I would say 6100 rpm. So I would say the redline would be 6200 and not 5600.

If the Titan shows a redline of 5600 rpm on the dash then that would be different. I would assume they would be the same as they both have the same motor.

icthetitan · 06-02-2004, 01:58 PM

Sorry, to clear things up I should have stated the 5600 rpm mark as the point where I see the transmission shift. It seems to knock off shifts around 5600 to 5800 at full throttle. Manually shifting I can hit around 6300 rpm.

Any ideas why the QX56 pulled that streetrod 0-60 time? (maybe a preproduction model?)

smoketitan · 06-02-2004, 02:00 PM

isnt that bad to go anywhere close to the redline in a truck??. when I manually shift ( man I wish the titans had a manual transmission) I only max out at 5000 rpm---opinions???

JS02 · 06-02-2004, 03:19 PM

The QX56 also is tuned for premium fuel. They may have tuned for substantially more power at the top rpm range. Maybe the 10 hp are really big horses!
Is the tuning the only difference in the engine and the Titan engine?

PA Titan · 06-02-2004, 05:26 PM

some magazine, I don't remember which one, posted 6.7 sec for the Titans 0-60 time

Quad T · 06-03-2004, 02:05 PM

Alex, great job - your avatar is very funny...

The 350 is a nice car, but you will never get me to like it more than my S2000.

Quad T · 06-03-2004, 02:09 PM

Quote:

Originally Posted by JS02

Is the tuning the only difference in the engine and the Titan engine?

I too have really wanted to understand this for a while. I know about the premium fuel, and I wonder about revised intake, exhaust manifold and muffler system. When you are talking over 300 hp even a 5% increase shows up as a nice number.

altima98 · 06-03-2004, 02:36 PM

Check out Car and Driver 0-60 in 6.9 secs

http://www.caranddriver.com/article....rticle_id=7272

Quote:

Originally Posted by icthetitan

I was reading my new issuse of motortrend yesterday when I noticed a 6.8 sec. 0-60 mph time on the Infiniti QX56

(in a test of big luxo-utes). It was a loaded AWD model, weighing around 5600 lbs (all QX56's have the 3.36 gears).

I wonder how a loaded 4x4 crew cab titan (weighing around 5300 lbs and with the 3.36 gears) can only pull off a 7.6 sec 0-60 mph time (that is the average I have seen in most titan tests).

I know the Infiniti as 10 more hp and 11 more ft/lbs of torque, but I doubt that cuts nearly a second off a 0-60 time while carrying 300 more lbs. One thing that caught my eye though was the 6200 rpm redline. In the test stats sheet it showed a 6200 rpm redline, which I initially dismissed since the Titan and Armada have 5,600 rpm redlines (even though they can be manually shifted up to 6,200). But a photo of the dash showed the 6,200 rpm redline.

I am guessing Infiniti was able to tune in a little more high rpm power. There is a noticeable drop in power in the Titan after 5,000 rpm, and it seems to be deliberate. (I say this because aftermarket ECU tuners for my 2003 Maxima found that Nissan made the engine run rich in the last 1,000 rpm and actually doesn't allow the throttle plate to fully open at high rpm wide open throttle - all in the name of emissions and engine longevity but also kills top-end power).

Getting some more out of the endurance in the high end is the only way I can explain how the Infiniti did so well. That, or motortrend can't read their instruments, which I just can't believe because they are the most knowledgeable and qualified testers in the world.

Sorry for the long rant, I just wanna see a 4x4 crew cab titan pull off a 6.8 0-60

icthetitan · 06-03-2004, 02:58 PM

Quote:

Originally Posted by altima98

Check out Car and Driver 0-60 in 6.9 secs

http://www.caranddriver.com/article....rticle_id=7272

That 6.9 0-60 is a great time for the Titan, but that is also a 2wd crew cab and it weighs 5000 lb. Infiniti did a 6.8 0-60 and it was 4wd and it weighed 5600 lb. See why I am confused?