Fast355

So the newest Titans now have the VK56VD engine in them from the Infiniti QX56. Rated about 390HP/400 TQ at the flywheel. I have yet to see any dyno numbers from them. The 1/2 ton model I saw tested by one of the magazines ran a 14.8 in the 1/4. For a stock small V8 it cranks out nice power.

I put my 100K mile M56 on the dyno that runs the same basic engine and trans today. My domestic car buddies are always giving me hell about having a "truck motor" in my car. The Infiniti is rated 420/418 because it runs a different intake manifold with dual throttle bodies, but a more restrictive exhaust setup (think luxury car quieter), and a more aggressive premium fuel only tune. For a mostly stock engine the HP and TQ actually surprised me. I know my M56 is desperately needing plugs changed as they are due at 105K and has a catalyst efficiency code popping up on bank 1 occasionally. Will have to drop the subframe to pull the engine to change the cats someday soon (hopefully adding long tubes and exhaust cams at the same time) but for now it runs strong. Only changes I have made are silicon intake tubes to replace the hardened, cracking OEM rubber ones, drop in k&ns and a 160°F thermostat.

It should be fun to see what a bolt-on Titan has in it in the next year or so. ARH already offers headers for the QX56 and Nissan Patrol with a full exhaust system. Untuned they gain 40 hp at the tire over stock. Kinda wish they would get on the ball and make a set of 1 7/8" headers for the M56/Q70s knowing they already make the flanges. That being said I have a feeling that despite the lower power rating and slightly larger driveline loss from the truck rear axle the new Titans will break 300 whp and 300 wtq in stock form. There is also already a twin screw supercharger setup made for the Nissan Patrol in Australia that adds more than 100 hp to the tires over stock.



The only real engine work that has ever been done on this car is intake valve carbon removal by walnut shell blasting I did back in December at 92K.

Before


After


Video of the run up to 6,000 rpm soon. Somehow did not catch the pull up to 7K on video but power peak ended up being about 6,000 and power fell off rapidly above 6,500 rpm. Probably not being helped by the 4 cats, the stock Y-pipe section that chokes down to single 2.5" or the restrictive factory resonators that neck down to 1 7/8" inside their cores.

Fast355

The pulls were made in 4th gear not 5th (5th is 1:1). With the 2.62:1 rear gear it would have been over 160 mph at the HP peak in 5th. As it was it actually broke 140 mph on the 7,000 rpm 4th gear pull. Neither the dyno operator or myself felt a full 5th gear pull was very safe. Not worth blowing a tire or launching a driveshaft for a few extra HP on paper. I figure the best automatic rwd setup probably loses 20% through the driveline. That puts this little 338 cube V8 with stock exhaust manifolds and cats over 440 HP!

ZO6Ted

Very nice! Tell me about the walnut blasting?

madmann26

iTrader: (7)

What site did you steal this from?

03sierraslt

iTrader: (22)

I was waiting for that.... lol

Fast355

Walnut blasting is using crushed walnut shell in a media blaster to clean the intake valves and ports on a direct injected engine. I used a combination of carb cleaner and walnut blasting to clean all the intake valves and ports. Car became much more responsove in the lower rpms and breathes better throughout the rpm range.

Fast355

Hahaha, nice try! I own this M56S.

Wolftrk99

iTrader: (5)

I had to install a replacement cat back on a 12 titan last sunday. If they are going to a higher output engine, hopefully they redesign the exhaust, cant see the 2" pipes helping the 5.6 breathe at all!!

Fast355

That system is actually larger than what comes on the M56s. The M56 knecks down to 2.5" single in the Y-pipe and the inside diameter of the resonator core is 1 7/8".

My 2012 Titan ran into the 13s at almost 100 mph with the stock exhaust piping. Just 2.5" mid-pipes without the rear cats and a magnaflow muffler.

Fast355

I finally saw a dyno video of one and it put down 310 at the tire bone stock and something like 340 ft/lbs of torque.

I just changed up the exhaust on the M56. Removed the secondary cats, factory Y, resonators, and rear mufflers. Dual 2.5" from the manifold cats, to a X pipe where the factory pipes split after the Y into the resonators, then magnaflow magnapaks where the resonators once were and 2.5" pipes to the factory exhaust tips I cut off the factory mufflers and opened up enough to fit the 2.5" pipes. Sounds VERY mean now and power is up across the whole rpm range. I have not even touched the tune yet but I got on it on an on-ramp that I usually can hit 70 mph by a specific marker in the road and was doing nearly 80 mph when I hit that point. It is up a good 40+ hp from exhaust work alone. Will get another dyno someday soon to know where it stands but it pulls very noticeably harder, especially in the 2,500-6,500 rpm range. Even part throttle kickdown at 70 with the tach at 2,500 rpm it pulls noticeably more responsively. This 11.5:1 5.6 loves to breathe and the factory straw like exhaust was just not cutting it. I left room at the rear where the factory mufflers were to add vibrant resonators or a pair of 14" large case magnaflows to tame it down even more but at this point I love the sound even if it is a bit loud and aggressive. I kept hearing how much low-end torque it would lose, but it knocks the back tires off practically at will through first gear and I am running taller/wider than stock P275/40R20s on the back.





https://www.youtube.com/watch?v=vIRBIR19A1o

https://www.youtube.com/watch?v=XUAP5UjgWxg