Does anyone know how the variable valve timing works in our VQ engine? I guess it's an advanced form of Honda's VTEC?
Is there anyway to control when it kicks in?

My sister's boy friend asked me if the G has something like VTEC cause he can fill something kick in. This reminded me that the VQ has some kind of valve technology. I didn't think anything kicked in, I just know that the car starts pulling a lot after 4k rpms. Is that the variable valve tech "kicking in"?

BS G35C 6spd navi/aero/prem

 

The VQs Valve Control is constant/continuous. This means its always on, there is no set RPM where it will kick in. From 100~7000+ RPMs, Nissan's Electronic Valve Control is doing its job.

As for Honda VTEC, it kicks in at a certain RPM. From what I remember it's at 5500RPM. Once it kicks in, it feels like a turbo kicking in.

That's why people who are used to driving Honda VTEC engines think the G35 feels winded at high RPMs. They are used to the VTEC kicking in at later RPMs, instead of having it on all the time.

- Don't argue with idiots. They will bring you down to their level and beat you with experience.=P-

 

Don't forget the new iVtec Honda engines use continuous variable timing too.

-Rick

 

also the G35 has a variable muffler, so around 4k the other exhaust tip opens up giving more exhaust gas flow, making it louder and giving more kick.

 

really BlackG? thats pretty cool, where did you hear that from?
I guess the best way to find out is to drive in cold weather so that you can see the exhaust gasses come out the pipes!

<font color=green>-Rambo</font color=green>
G35c 6MT DG/Willow

 

That variable capacity muffler is for real bro. Don't think one side is completely shut off at low revs, but very little flow. When you punch it, the opposite side quickly opens for freer flow. Slow down, and it closes down again.
Apparently, this system helps with low speed torque.

<font color=green>GSM</font color=green>

 

thanks, very cool to know. Ya I remember when the honda vtec kicked in it made this high pitch noise.

BS G35C 6spd navi/aero/prem

 

Seems pretty "off" to me. Start your car, let it idle, and walk around back. Feel the air coming out of the exhaust tips.. you'll note only the left one is active at idle.

If you want to feel the other one, you'll have to have a friend drive your car, and you need to run really, really fast....

2003.5 G35 Sedan Desert Platinum/Graphite Premium/Sport/Aero/Nav/Winter

 

Ahh, now I get it, the variable muffler only applies to the Sedan right?

-Rick

 

The I35, Q45 and M45 also have the variable capacity muffler and some other Nissans. The G35 coupe has the "free-flow" design.

 

Correct. The sedan has the variable capacity muffler, the coupe does not -- though it has dual exhaust.

The new '04 Maxima, I believe, combines dual exhaust and variable-capacity mufflers.

2003.5 G35 Sedan Desert Platinum/Graphite Premium/Sport/Aero/Nav/Winter

 

So has anyone seen any LOSS of performance when upgrading the exhaust?

It would seem Infiniti did this to maximize torque down low

Hypothesis: Would getting rid of the big resonator in the exhaust system help or would it thow off the tuning of the variable capacity muffler? I need to dyno this thing.

Better Life thru Chemistry