It looks like cars today operate at higher transmission fluid temperatures. Has anyone else noticed this? I am using Torque Pro app. I suppose this must have something to do with the cooler bypass valve.

 

It's not that they necessarily operating at higher temperatures, but it's the fact that most modern engines put out 2x to 3x the HP and torque compared to older cars. So of course they are going to run a bit hotter.

Also the manufacturing tolerances allow for this.

 

Today's transmissions are designed to operate at those temperatures.

 

Thanks guys. Good insight. I have to step out of the dinosaur era. I'm still looking at all of those old charts showing 175 F as an ideal operating temperature. OEM thermostats open at 190 F. Is it safe to assume that the OEM cooler bypass valve closes at 190 F?

 

185 to 200 is normal, it's safe to 230. Make sure you use Mercon LV.

 

Okay. I believe you. Just wanted to say that my 6F35 is paired with a little 2.5L inline 4 cylinder engine, which doesn't have much HP or torque. But it's still probably more powerful than a 4 cylinder from 30 years ago.

 

most assuredly it does have more HP and tq than most of the v-8's 30+ yrs ago...
BTW what gear were you in....2nd?....lol 2900 rpm @ 64 mph

 

Small engines rev high to keep up with freeway traffic.

 

The little Duratec engine and 6 speed transmission has gone into quite a few Fords in the past few years. They seem to be okay, for the most part, except for the ones where the "lifetime fluid" did not get changed. I suppose on more than a few occasions, they were also overloaded with too much weight. But they have been okay in the little passenger cars.