Search results

Great article that destroys the BEV "5 cents per mile" nonsense. When you include everything, we are talking about 50 cents per mile for a Tesla. I get into the details here: https://www.uberpeople.net/threads/why-hybrids-beat-ice-and-bevs-hands-down.492097/ .

Ok let's assume you are right and ATFs shear up instead of down. Fine. Now the viscosity increases as you drive, so you might experience a change in the way the shifts happen. It might be better. Might be worse than what you prefer. Now you can see the value of the thread, because you might...

I again disagree and I don't know what you insist on (a) fighting (b) here of all places; IMO Dexron VIs also shears down as the very high molecular weight molecules are thermally destroyed and otherwise broken down into smaller molecules. Here's an measured example contradicting you of it going...

Perhaps but see and it's not on topic to the Q anyways.

bell_housing_torque is (engine rpm)/(rpm supplied to the rest of the transmission) as a function of ATF viscosity. Should be a straight line: assuming the densities held fixed since that's basically close to how viscosity is measured. But, I don't know. It's why I am asking. I am not sure you...

"Most all modern automatics are looking at shift slip time (via the speed sensors) and will adapt the solenoid pressures toward getting to the desired profile." Doesn't this mean that both valve_body_torque(viscosity) and fluid_pressure(viscosity) are one, so they have no effect?

Sorry if you are lost. The Q is asking about an end effect that is actually a function of several different components all operating in series. So, one has to look at all of the parts of the system to figure out what's going on but the Q itself is just about how to detect too low or too high of...

Well, it all depends upon how you look at it. Using a thinner oil in a machine is always 100% compatible if your real goal is to get it into a yard. And it will get you to where you need to go until it fails and you need to purchase a new unit. Sales are inverse of longevities.

So, in the spirit of maximizing the value of this thread, let's attempt to really nail what's going on in detail. Correct me if I am wrong, but what you are implying, including other contributions to this thread thus far, is that there are four factors in the torque "jerkiness" equation during...

Thanks Tkonrr! This was the kind of answer I was looking for. So, to summarize, at least for the older automatic transmissions (not dual clutch), with the planetary gears and the bell housing torque converter with lockup features (no clue about ZF's 8HP), for case (1), the viscosity is too low...

If you are driving a car with an automatic transmission and the ATF fluid has the wrong viscosity, what will you be able to notice from the driver's seat? Please reply for any cases you have knowledge of. Obviously, the two cases are in which the viscosity is (1) too low and (2) too high...

I just wanted to point out that this conversation has a lot of people claiming that Slick 50 is snake oil, when they didn't even state which Slick 50 they were talking about. This alone is why IMO nobody besides me in this thread has a clue what they are talking about. The version that is...

Wow! That's so low!!!! I am shocked! This is after it sheared down, of course. I wonder what the data sheet says. No wonder ZF had some issues with this fluid in my Audi A6.

I can't find it anywhere. The closest post I could find giving an answer was this one: https://f30.bimmerpost.com/forums/showpost.php?p=25089524&postcount=2 I tried to go to the zf website, but I wasn't able to find the data sheet for Lifeguard 8. Can anyone help me? The zf website is...