Is There A Fix For Auto Trans Wont Shift Into 4th Until Warm?

[bronsin]

Originally Posted by SAV912

No, I'm smart and bought the proper transmission (manual) for my driving style. I'm not the one starting with one thing and trying to turn it into another.

You asked a question, and you got an answer. It's nobody else's problem but your own if you're not satisfied with it. For what it's worth, I'm not in 5th until 40+ MPH anyway. I don't see why you're pissing and moaning about an automatic doing what it's suppose to do at low speeds and low temp/op conditions. The quicker the engine reaches optimal temp, the quicker it gets to max efficiency. Modifying the programming to get into 4th as quick as possible under cold conditions will result in it taking LONGER to reach optimal temp, and thus burning more fuel anyway, defeating the entire purpose. You got 28 MPG for a variety of other reasons. Not because you can't get into 4th for one mile of your seven mile commute.

-C

Well maybe I can get YOU to put your money where your mouth is. Drive for a tank of gas in fourth gear of your manual trnasmission and tell us what mileage you get.
We trust you to tell the truth!

If this mod proves possible I will post my results also. Then we will see what is what.

[SAV912]

Dude, you're just not making too much sense. People with manuals such as myself CAN get into 5th gear right away with the cold lamp activated, but it is certainly not beneficial in regards to fuel economy. Since the ATX does the shifting for you, it automatically (imagine that?) figures the most optimal gear to be in under the given conditions. And in the conditions under a cold start, it is optimal to get to optimal temp as quick as possible, hence locking out overdrive.

Originally Posted by bronsin

Well maybe I can get YOU to put your money where your mouth is. Drive for a tank of gas in fourth gear of your manual trnasmission and tell us what mileage you get.
We trust you to tell the truth!

If this mod proves possible I will post my results also. Then we will see what is what.

I'll tell you the truth right now. That's not the same situation as what you're proposing. You don't take off from stops in 4th gear of your ATX, why should I do it with an MTX and post the findings? You also don't know my driving conditions or my commute. From what you posted, you'd actually be pretty alright cruising in 4th gear of the MTX at 40 MPH. If you had my commute which involves several miles down I-95 in 80 MPH flow, then I'd be first in line to tell you that you're silly for staying in 4th at that speed, but that wouldn't be applicable either as by the time you reach the highway from where I live, your ATX would've warmed up and you'd be fine. Drop to overdrive immediately from a cold start, and that may no longer be the case, thus keeping the engine colder longer and not optimally efficient thus robbing you of more fuel economy than if you let the transmission do it's job. I don't know what better way to explain it to you, but go ahead and for shits and giggles, do your mod. Report back the findings. You're already sitting right at the EPA City rating for the Yaris, so I don't know what more you expect to find given your commute, conditions, and driving style.

It's almost comical how some of the fuel economy guys think they know better than a corporation full of engineers.

-C