Hey guys, long story short... I used to own a 2001 Celica GTS with the same 2zz engine and now I'm a recent owner of a 2005 Vibe GT with the same motor. When I accelerate, at exactly 4000 RPM I'm noticing a deeper pitch in my intake and a bit quicker acceleration. Then it's the usual lift at 6700 rpm to 8000. I was wondering if anyone could shed some light on what's happening with this motor at 4000 rpm as I've never noticed this on my 2001 Celica gts. Has the 2zz changed since then?
Thanks in advance!
Info I found on wiki:
Toyota commissioned Yamaha to design the 2ZZ-GE, based on Toyota's ZZ block, for high-RPM operation and producing a power peak near the top of the RPM range. The high-output cam profile is not activated until approximately 6,200 rpm, (lift set-points are between 6,000-6,700 rpm depending on the vehicle) and will not engage until the engine has reached at least 60° celsius (140° fahrenheit.) The Toyota PCM electronically limits RPM to about 8200 RPM via fuel and/or spark cut. The "lift" engagement and the engine redline vary by application.