Popeye

When I shift @ 8500 I stay in VTEC Maybe you guys need to get rid of your 22Lb bing wheels

afwfjustin

In first gear I have to shift at 7-8K so that I won't throw the back end sideways when I shift into 2nd.

vtecissexy

god I wish I had that problem =[

afwfjustin

ZDan

Q already answered, just throwin' in my 2c.

For max acceleration, you want maximum power at all times. Even though you're beyond power peak above 8300rpm, you're still making WAY more power than you would be at the same speed in the next higher gear, in or out of VTEC.

In the S2k, best performance comes shifting at redline in every gear. It is possible that for some cars optimum shift point will be below redline in the higher (closer) gears, but it is ALWAYS above peak power rpm.

sly2

Ok guys im a little confused, i know the AP1 can rev up to 9,000. but im here checking the specifics and it says 240 hp @ 8,300.... if our peak power is reached at 8,300 why do you guys take it all the way to 9000? wouldnt that just waste time?

No it's not a waste of time.

Most people believe that the maximum acceleration occurs at peak HP, when in actuality it occurs at peak torque. So your question may be why not shift at 7500 which is the peak torque.

The answer is transmission gearing. I'm ignoring rear axle gearing because it's a constant throughout the gears. So the torque applied to the drive wheels will vary depending upon the gear you are in. If you are in first gear the torque would be 3.1 X 153 at 7500 RPM. In 2nd gear the multiplier drops to 2.0. So you want to maintain lower gear ratios as long as possible to realize the benefits of the mechanical advantage of the lower numbered gears.

The other issue mentioned by others is that you want to keep your engine in its optimum power band. When shifting you are going to drop around a couple of thousand RPM, so you want to make certain that you don't fall too far below the RPM range where your engine provides maximum torque.

dead-bird

For maximum acceleration you want to shift at the moment when torque drops below what it will be in the next higher gear.

As others have said, maximize area under the curve. The torque curve.

GOS2K007

I hate that when they charge more for auto than manual.
With my GTO I had to pay more to get the manual 6 speed over the auto. It was an added option.

plokivos

I shift at 4000 rpm. It keeps me in the corolla like readiness.

9KADDCT

i always have that problem.. stupid 4.77s