Max Speed in Each Gear for 5 speed man. Yaris with no tach??

[justjesus]

Originally Posted by 09TRD

I'd love to see you prove that empirically.

Peak HP occurs at 6,000 RPM. Redline occurs at 6,500 RPM.

You'll want to shift at or near red-line for peak performance, even though engine horsepower falls off after 6,000 RPM. Why? Because doing so will put the engine closer to its horsepower peak in the next gear (immediately after the up-shift) while ensuring peak obtainable drive-wheel torque at all vehicle speeds.

Precise shift points would be determined in the fashion discussed in this link:

http://www.allpar.com/eek/hp-vs-torque.html

Generally speaking, shifting at red-line is a good "rule of thumb" for maximizing acceleration. That tends to be especially true for higher revving, small displacement DOHC engines (e.g. Yaris engine).

I've been told that the Yaris's owner's manual recommends the following shift points for maximum acceleration:

1 to 2: 31 MPH
2 to 3: 59 MPH
3 to 4: 86 MPH

.

And I'd love to prove it as well. If i had easier access to a track, I'd do it. Would you settle for a measured distance (1/4 mile) vs time (stopwatch)?

It's nice to have peak HP so close to redline, as it makes your point that much easier to work with. And, for most people (as well as the common point of view), shifting at redline would be best.