all MANUAL transmission Z's for 06 have the 300hp/260tq rev up engine. automatic 06 Z's retain the 287hp/274tq engine from previous years

 

Increase in hp is via:

1) changes to the camshaft profiles
2) adoption of stronger valve springs
3) variable exhaust-valve timing
4) installation of upgraded pistons, rods, and crank pulley

[ see: http://www.caranddriver.com/article....rticle_id=9269 ]

p.s. isn't this an old topic?

 

Nothing MRev V2 wont be able to fix for the 287hp Z's!!

G

 

 

In context I agree aboslutely, but figuring in weight plays a big roll too. My '04 base model has a stock lbs:hp ratio of 11.10, better than any of the '06's with 300hp. But like you said, it's the area under the curve, not the peak numbers that matter.

 

All I gotta say is my 06 base is stupid quick for a stock ride that is gonna get mods here pretty soon...

 

that car and driver article rated the 06 300HP Z as 5.8 0-60 and 14.3 quater mile....whats up with that?..slower times than the 287hp

 

The 287hp models have a lot less weight, so just because the '06's have 13 more hp doesn't mean they accelerate faster, or even as fast. Read my above post. Not to mention the heavier the car is, the harder it is to get off the line.

Don't take magazine racing seriously, either.

 

Track conditions came into play as well as engine differences. C&D tested that car after it was raining. Poor grip.

In reality, the test numbers are essentially the same between the 2 engine types.

 

I see, cool cool....so what was the point of nissan gaining HP and losing TQ. if its virtually the same times?

 

^ ...because the times wouldn't be so close if they didn't add 13 horsepower to make up for all the added weight.

 

...and that too

 

Likewise, i had an 287 motor just like some people here still a great engine, and the stock exhaust on the 300hp motor is just louder, especially when u start the engine...they even hooked up the base with the 18's, HID, LED....the 05 base didnt have HID's correct?

 

i'm gonna go out on a limb and say the 06 motor might be more open to tuning w/ variable exhaust-valve timing????
*
and it sounds like they made the whole set up stronger.

 

Like mc350z said, 300hp is more marketable, even if the differences are negligible.

There are some who say that the increased redline limit (7000 rpm) allows you to more fully take advantage of the engine's potential and that it does in fact respond better to modifications.

Lastly, if you want the 13hp bump without the weight increase, you can always go for an '05 Track or a 35th A.E. I did read somewhere, however, that the new weights were over-estimated, and that when the '06's were weighed, they weren't that much different than the '03-'05's.

 

The 300hp engine has more torque between 4,500 and 7,000rpm than the 287hp engine.

So even if peak torque is less, over all it has more torque.

 

you are saying the 300hp has more torque above 4500 rpms, yet the peak torque at 4800 is lower? if 287hp engine peak torque is higher at 4800 it probably is higher before 4800rpm, and also well after 4800rpm.

I'll keep saying it, there were even the 2 dynos on nissan.co.jp website, the 300hp engine produces more torque at more than 6000rpm(close to 6200rpm), bellow that rpm the 287hp engine produce more torque AND hp.

change cam profile and intake on the 287hp engine and it will be within 99% of the 300hp engine(you can have intake cam give exact same lift and duration as the vvted cam). Personally I think it's not worth the money for the mods. The fact 300hp engine do the MREV mod, sacrificing high end power for mid range says a lot...

 

Whatever are the exact rpm/torque. Fact is, divide the 287hp/peak rpm and do the same with the 300hp engine, the 300hp engine produces more torque. The rpm alone don't make up the difference.

Just plug the numbers in the power equation...

Ah, and its not because "people do it" that a mod is valid. It's just ignorance for the most part, and plassebo effect from the engine feel and sound.

I find it interresting that lots of people say that the 300hp engine is not that good 'cuz you can mod the 287hp and make the same power for a couple of thousand dollards...