My Experience Driving a Chevrolet Traverse

So under your theory, the automakers could be getting BETTER MPG results if they started the CVT at the very bottom end. Yet somehow they have never figured this out and are passing up that great opportunity to get better gas mileage because ALL the automotive engineers except you don't understand how things work.

You are free to believe whatever you choose. However I suggest you do some research before you choose to comment again on a subject of which you obviously have little or no knowledge

Why? Clearly you never do.

"Mike" wrote in news:ZaKdnRZ2vfL6ghTRnZ2dnUVZ snipped-for-privacy@ptd.net:

ya well I worked in a ford dealership that the enginers came to to find out how to really fix there screw ups. So don`t try to play the dam enginer card with me. the only thing max torque is is the most efficient part of the eng output. that does not translate into the most efficent accelerating of a specific load unless the eng is sized small enough to use the least fuel in the accel mode. Or a smaller slower accel is almost always more efficient, regardless of part throttle efficiency. KB

You answered you own question. Your response that "the only thing max torque is the most efficient part of the eng output," is WHY you use full throttle with a CVT you get to the desired speed, whatever that speed may be. Think about it, would you use third gear to go from a stop to 45 MPH, if the vehicle had a six speed manual tranny?

The most fuel efficient way to accelerate is almost always slowly. That is usually true with CVTs, including the ones that Ford uses. There is nothing special about CVTs that make stumping on the gas the most fuel efficient way to drive the cars.

Jeff

As an automotive engineer, you undoubtedly know that when you apply WOT, the PCM drops into open loop using preprogrammed fuel look up tables (AKA rich mixtures comparatively speaking). The PCM disregards O2 sensor input during this time.

Additionally, during wide open throttle events the EGR valve will open. This mixture dilution affects the efficiency of the engine, reducing fuel mileage even further.

Often, after a WOT event, the PCM will once again revert to open loop operation to help reduce catalyst temp.

In all of my years, I have never seen WOT offer any fuel savings... ever.

Your "experience" outranks nothing on usenet.

You should foloow your own advice in this case.

Ed

You are entitled to you own opinion, even if you want to believe that it is more efficient to START out in a higher gear. I suppose you start in third gear when you drive a manual tranny, as well? ;)

You are free to believe whatever you choose.

Ya right.

"Mike" wrote in news:npCdnY5Y84_5oxPRnZ2dnUVZ snipped-for-privacy@ptd.net:

this is correct, the slight efficiency gained with max torque throttle (not wot) is not offset by the time difference between a slower accel less torque intensive smaller throttle opening. A engineer should know this!!!!!!!!!! there have been many actual tests done to prove this over and over. (a "very" small eng could be the exception) KB

Ya right.