02silverpathy Posted November 1, 2007 Share Posted November 1, 2007 Anybody here with a VQ ever hear those powervalves shut after like 45oo rpm's?? Listen to your intake, during hard throttle, long rev you will hear the intake go from deep growl back to mild somewhere near 5k.....anybody have any good info here?? I have 1 theory but I want others thoughts first. Link to comment Share on other sites More sharing options...
Orangetang Posted November 1, 2007 Share Posted November 1, 2007 My guess would be Nissan's N-VCT, VVL/VVT or whatever our VQs have. Either the cam rotation, timing, or valve duration is shifting, similar to V-Tec in a Honda??I have noticed the 4500rpm note change since the first time I drove mine. Always assumed it was some sort of fuel economy/power related Nissan V-Tec. Link to comment Share on other sites More sharing options...
Trainman Posted November 1, 2007 Share Posted November 1, 2007 Ah, the variable valve timing sounds like the answer. Yes, I hear a change then too, and have always put it down to the VVT. Our Sienna also has VVT and it does the same thing. Link to comment Share on other sites More sharing options...
nissandoms47 Posted November 1, 2007 Share Posted November 1, 2007 Probably just those valves closing. Link to comment Share on other sites More sharing options...
asrautox Posted November 1, 2007 Share Posted November 1, 2007 LOL, you should hear it with a K&N CAI.. I always thought it was the intake manifold.. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now