Quote Originally Posted by krucial7integra
I don't know the big dif between the 04+ and previous but I have driven a '01 and I have to agree with julio, the power is really nothing, don't get me wrong, it runs but the redline sucks, you get full power around 5500rpm or so but redline at like 6500 or so. They use the same concept as vtec, vvt-i or something.
OK, you're way off. 01 Sentra might have been an SE, which is a SR20DE w/5spd. COMPLETELY DIFFERENT ENGINE. They have no variable valve timing, .5L less displacement, are heavier, etc, etc, etc.

And even if you're talking about the 02+ SE-R's engine (QR25DE), you're still off. It is NOTHING like VTEC. VTEC uses two sets of lobes on the camshaft...the engine stays on the smaller lobe until X rpms, then switches to the bigger lobe. The QR25DE uses continuously variable timing. Meaning it will advance or retard the timing on the intake cam depending on driving conditions and throttle position.

There is another "switchover," but that is merely the dual-stage intake runners opening up the short runners at 5000rpms.

Please do a little research before posting about something you know little about. Thanks.

Scott