Originally Posted by saxman
it doesn't look that bad to me... yah, there's a dip in torque at 4kish that's less than ideal, but I've seen much worse.
the jaggedness of the graph could really be something as simple as what the smoothing was set to on the dyno output. A dyno output will never come out super smooth... there's always a certain amount of smoothing done in the software make the output "pretty".
There shouldn't be any jump in power at 7200rpm(which seems awfully high to me to have vtec set to, but that's just me) or wherever vtec is set to engage if the motor is tuned properly. A jump in power at vtec means the car is making less power than it should.
What really need to be done to show the quality of the tune is for you to show a before tuning dyno, the after, and an a/f printout, not a shot of sorta part of one graph.
Also, having a dyno show readings after peak redline isn't that rare... remember, you're spinning a big heavy drum, and accelerating it. It's going to continue to increase in rotational velocity after the clutch is disengaged... this is called physics.
