1) i am not sure i understood what you saidD1dad wrote: ↑Mon Aug 26, 2024 5:02 pmI just checked the fluid after vstar and myself found out that my 24 Altima cvt runs hot as hades. By design. I’ve got a scanguage 2, which I’m sure anything that measure trans temp will work. Anyways, I got the trans to 100 degrees, pulled the plug and there was a trickle. Dead nuts on. So the trans just runs hotter than cvts of old.
You’re not wrong. Precisely why the 24 is getting a ready diet of HPL motor oil and exactly why the FSM at Nissan told vstar to upsell cvt service. Common sense and experimenting has told us to get cvt temps down via a cooler for longevity. Nissan jumped the shark on at least the cvt used in the 24 Altima. I’d be interested in some data from the new rogues. There’s a bit of logic behind burning off condensation in a cvt but at what cost? We won’t know for a while unfortunately. I did run to northern Kentucky and back last week. Mild hills doing 80 in 90 degree temps. The cvt would get to 216, then a thermostat somewhere would open and the temp would drop to 208. This was constant and in no way related to letting off the throttle or hitting flat terrain.V6er wrote: ↑Tue Aug 27, 2024 6:40 amwell...
1) coolant circuit is connected to cvt fluid via heat exchanger.
2) "mighty" nissan engineers made engine hotter - to dismiss water from oil (so you can "enjoy" longer oil change intervals, damaging your engine in process), to help with emissions etc etc.
haven't heard anywhere that hotter thermostats helps longevity... ;(
My '04 can name that tune in zero notes.
They need to be way underfilled before you see any symptoms at all. We saw one Sentra that literally drove around a full quart low for at least 10K (we don't know exactly how long), but it didn't overheat or even get a headache. On the other hand, even a pint high will usually cause a measurable temp increase, and a quart over is usually a CVT death sentence. It's because overfilling causes the fluid to foam, and the foam creates "thin" spots in the fluid film which is supposed to prevent the belt from contacting the pulleys. That creates extra friction which spikes the temperature in a hurry, plus adding extra shear load onto the already-boiling fluid. They don't last long in that condition, we've seen them crap out in as little as 1000 miles.