On the VTEC and CVTC debate, here are some interesting articles to clarify:

http://www.ukcar.com/sframe.htm?/fea...e/vv/vvt_1.htm
http://www.ukcar.com/sframe.htm?/fea...e/vv/vvt_2.htm
http://www.ukcar.com/sframe.htm?/fea...e/vv/vvt_3.htm
http://www.ukcar.com/sframe.htm?/fea...e/vv/vvt_4.htm

As you will read, the 2 technologies are different. They take different approaches to the problem and come to different results. They each have advantages and disadvantages: VTEC will get you more power but only within the upper RPM range whereas CVTC will get you less power but across the whole RPM range. An interesting note about VTEC is that it uses the momentum of the intake at high velocity to shove itself into the cylinder (pseudo force induction), which is why it is available only at higher RPMs. Another note is that Honda has already incorporated CVTC into the higher end sporty cars, eg. S2000, RSX TypeS, etc.

 

the information I got for the G is they are going to be doing something with the intake(not sure if it's the plenum or intake tube or both), variable cams on both the intake and exhaust, stronger rod bolts, and they are going to bump the rev-limiter up(6900-7100). And I was told the Z should be seeing the same changes but would be 300+hp.

and this is from an inside source not a salesman.

 

just wait and see guys.

and for the honda vs nissan crap:

higher u rev = less torque u get
lower redline = more torque u get

it's like 3l v10 F1 engine makes like 90flb of torque redline 17000

and a 1.3L jetta TDI diesel makes 190flb with 3000 redline

u can't have the best of both world.

 

thats not true....

the VW TDI engines here are 1.9L and 2.0L. The 1.9 makes 100hp and 177 lb/ft, and the 2.0 makes 134hp and 247 lb/ft of torque. The reason that diesel hp ratings are low is because this engine design cant rev very high, with a 5000 rpm redline (hp = torque * rpm / 5252).

Fun engines to drive though, for sure.

So when is nissan announcing the 2005 news? I'm about to order a 2005 350z this week, and I'd like to know.

 

nice avatar

 

vtec is much more intense when it kicks in, due to the fact that the powerband sucks so much *** juice direct from the source before that point.

and doesn't the z rev limiter kick in at 6800, not 6600?

 

How did a post about 2005 Zs, turn into a talk about jettas and civics???!!

 

Dyno's are subject to a lot of different conditions. With that said, my stock Z Dyno'd this weekend at 250.5 rwhp. 94 degrees, 85 percent humidity at sea level. We dyno'd 16 350Z that day, and the power range was anywhere from 242 rwhp to 260 rwhp. One outlyer was at 214 rwhp.

 

OK, some kid at a book store who knows me said he saw the new Z today. He said he didn't like it as much as mine (2003). He said it's smaller.... He also said he went right up to it and looked at it, that's how he knew it was a 350z. I still don't believe him. It just doesn't make sense. Any thoughts?

 

He was wrong. He was prob looking at a Tiburon or something!

It could have been a roadster; maybe it was a Z4 or a S2000 or maybe he was just BS'ing. He CAN'T have seen a 2005.

 

2005's are not out yet, and probably will not be delivered to dealers until mid august.

 

THAT'S IT! He must have been checking out a raodster. God i'm a moron. I know the 2005's arne't out yet, I was just trying to figure out what the hell he was talking about. haha. Thanks!

 

i can speak ilocano and pangasinan and tagalog so.......THERE! im a 5 foot 6 pinoy, can udig it?

 

You guys are kind of comparing apples to oranges. VTEC and VVT are fairly different. Do a search online if you want to get more into detail on the two...

But that "jump" you feel at certain rpms with VTEC is the cam profile changing over to the high lift profile. VTEC is variable time AND lift control... the VVT on our engines only varies the timing... not the amount of lift. The VTEC systems cams are like having two cams... at low rpm you have a low-lift profile, and at higher rpm when you want better breathing it switches over to a higher-lift.

As far as i've looked into our engines, we just have the variable valve timing... similar to installing adjustable cam gears, then manually setting them to the optimal timing on older cars... only our's is automatic and continuously variable depending on what's best. But we do not have variable lift control on our engines.

this link shows which nissan engines have valve timing and which has valve lift control.

 

I emailed Nissan to get some answers, not on the 2005 changes but for alternate purposes that cannot be discussed but may be talked about in the future. Anyway, I asked them about the 2005 Anniversary Edition, they said that Nissan has no plans in the near future to produce any Anniversary Edition 350Z, but that they do plan on the GTR going on sale in North America as early as 2007.

 

someone said vtec was only for fuel economy... maybe on one of the civics and accords that was the case, but... in an acura TL, Integra GSR, and Prelude (newer), I can vouch that you can hear and feel the switch over. Especially once you start doing mods. A friend had a 99 (i think) prelude... he had me drive it to race it a lot b/c I shifted quicker. he had intake, headers, exhaust, and some other bolt ons, and it was crazy, you could easily here it, and feel it. and with a fuel/air controller that also changed the vtec switch point, even more power could be realized. (probably wouldnt be a good idea to change the switchover point unless you've done mods). As for the variable timing on the Z, it is just like my TWELVE YEAR OLD Maxima SE... okay, maybe not "just like" but my understanding of what is on the Z, it is very similiar. My maxima has variable timing on the intake cams... it just shifts the gear basically.

 

Any confirmation on mods for 2005?

 

www.nissannews.com it has the changes for the 2005s

350Z Coupe
The high performance Nissan Z®, which comes with a standard 3.5-liter DOHC V6 engine, has sold over 70,000 units since its introduction to the U.S. market in August 2002. The stylish, 287-horsepower 350Z continues the Z heritage of design, performance and value that has remained unchallenged since the original Datsun 240Z was introduced 35 years ago as a 1970 model. In 2005, the 350Z adds only minor enhancements.


Enhancements to the 2005 350Z Coupe:
· Standard Tire Pressure Monitor System (TPMS)
· Clutch pedal effort has been reduced for easier operation
· 5-speed automatic transmission features downshift rev matching
· Standard driver’s seat front and rear lifter
· Heated outside mirrors
· Faster navigation system processor for improved route calculation times
· Newly available Ultra-Yellow exterior color (Liquid Aluminum exterior no longer available)


350Z Roadster
The 350Z Roadster offers sports car lovers high performance excitement and dynamic driving experience, but with an open top. Featuring a power-operated soft top with glass rear window, the Z® Roadster is designed to transform from top-up to top-down in 20 seconds. The fully automatic soft top stows compactly under a lightweight tonneau cover, completely hiding the top when down. The Z Roadster will continue to offer the powerful 3.5-liter DOHC V6 producing 287 horsepower and 274 lb-ft torque.


Enhancements to the 2005 350Z Roadster include:
· Standard Tire Pressure Monitor System (TPMS)
· Clutch pedal effort has been reduced for easier operation
· 5-speed automatic transmission features downshift rev matching
· Standard driver’s seat front and rear lifter (except for net seat design)
· Heated outside mirrors
· Faster navigation system processor for improved route calculation times
· Newly available Ultra-Yellow exterior color (Liquid Aluminum exterior no longer available)

Blue is STAYING!!!! lol Can't wait to get one in the spring.

 

What does it mean

5-speed automatic transmission features downshift rev matching

Engine will be revved up automatically for downshifts? At exactly what moment? When you put in lower gear or when you drop the clutch?

Won't it slowdown downshifts when ECU will interfere with drivers own actions (trying to help of course)?

 

Thanks!