6MT.net Infiniti G35/G37/GTR Community

WS · 03-01-2004, 10:47 PM

well i found a very interesting site on this and i know the G35 has variable valve timing, but im not sure if the version in the vq35de has variable lift as well. I think it is only on the intake cam as well which is ok, but would be cooler for both cams to be variable.

anyway i found this site on explaining most systems like hondas vtec and toyotas vvti. they have some nissan info but not much
http://www.mr2sc.com/websites/articles/vvt.htm
if someone knows specifically the way the G35 variable valve timing works i would love to know. I know with the Motec standalone engine management you can control variable valve timing, but im not sure how the g35 triggers the change in the timing. I just think it would be cool to change the timing so that you have a very rough idle sometimes just for sound purposes, but i do not know if this is possible with just variably intake timing. someone please fill in the missing details on nissans variable valve timing and what u may know about motec or other engine management systems.

Fwabs · 03-02-2004, 01:19 AM

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by WS

...but im not sure if the version in the vq35de has variable lift as well. I think it is only on the intake cam as well which is ok, but would be cooler for both cams to be variable.<hr height="1" noshade id="quote"></blockquote id="quote">
I am pretty sure the VQ engine does not have variable lift, but it does ahve the variable timing. So the reason for not having it on both cams is for the fact that one of them is moving while the other needs to remain stationary.

<blockquote id="quote">quote:<hr height="1" noshade id="quote">
if someone knows specifically the way the G35 variable valve timing works i would love to know.<hr height="1" noshade id="quote"></blockquote id="quote">
I believe it is done possibly by the wayt hey explained the second one with the gears rather than the chain. But im not sure.

<blockquote id="quote">quote:<hr height="1" noshade id="quote">I know with the Motec standalone engine management you can control variable valve timing, but im not sure how the g35 triggers the change in the timing. I just think it would be cool to change the timing so that you have a very rough idle sometimes just for sound purposes, but i do not know if this is possible with just variably intake timing. someone please fill in the missing details on nissans variable valve timing and what u may know about motec or other engine management systems.<hr height="1" noshade id="quote"></blockquote id="quote">
The G35 timing runs just like every other engine with VVT does and I believe that it does the timing according to the rpm that it is at. Also as far as changing the timing consistantly I am not to sure you can do that, I dont know alot about the MOTEC system and if that allows you to do that, but I dont see why you would want to do that. I think it would become more of an incovience. Could you see someone sitting in your car and your car starts making the same noises a 1960 car does, wont make it look to good. And if you want your car to make noises when you turn it on or when its at idle just rev your engine, duh. So i think that was what you were asking about nissans VVT system whether it is done by a chain or gears, since the rest of the information is int hat article. By the way great find on it!!

2003 G35C / 6mt / DG & Graphite / Nav / Premium / ETA April 6th

WS · 03-02-2004, 04:36 PM

hmm, maybe its just me, but i love a nice rough idle on a car. My buddy has a Trans Am WS6 with a very agressive cam in it and it sounds real cool at idle....not practical for a lot of driving, but real nice sound and real nice top end power. i also heard an eclipse with a rough idle....just sort of a warning not to mess with the car, lol

Fwabs · 03-02-2004, 06:49 PM

Are those cars able to pass smog though, that might be somethin to consider. If all they did was change the cams then Nismo sells cams for our car. I mean i guess the rough idle is purely preference, I would hate a rough idle i like it when it just purrs, but then comes alive once you break 3500-4000rpm, but to each his own. I will try to help you with what you are looking for.

2003 G35C / 6mt / DG & Graphite / Nav / Premium / ETA April 6th

WS · 03-02-2004, 09:09 PM

well i know they make nismo cams and a few others, and there is a cam that they have at sgp racing where it lopes at idle, but that is not really what you want for daily driving. i was sorta wondering if it is possible to use the computer to advance or delay the timing to make the cam lope at idle...just for show. and about the smog, my buddy registered his trans am in maryland so he has no emissions.