Neat thread on CVTs

Revving2Redline

Revving2Redline

Joined
Feb 25, 2014
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https://www.rumanza.com/cvt-transmission-oil-a-comprehensive-guide/

I've posted a picture of the data of both the high performance and the red line non-slip. I can't really wrap my head around the numbers but my feeling tells me the high performance might be better in the winter and the red line would be better for a summer application? Considerable amount of difference in the viscosity index from about two of the only fluids in a CVT I would choose. If somebody can help me out in a nutshell that would be great.

Screenshot_20250110_125020_Brave.webp


Screenshot_20250110_125113_Brave.webp
 
benjy said:
NO CVT for me + NEVER electric or HYBRID!!!
Click to expand...
I said that but I could not find an economy car without a cvt. The only one that I know of is the Honda civic hatch sport. But that's going to run over $30K. So not all that economy. That's all they manufacture now. Very few mt vehicles available at all. A couple two door sports cars.

Some multi speed automatics are still available but even they're getting fewer. Mostly in the larger vehicle segment.

As far as ev's or hybrids, seems like governments are mandating them more and more. Some US states are mandating all ev's in not too many years.
 
NibbanaBanana said:
I said that but I could not find an economy car without a cvt. The only one that I know of is the Honda civic hatch sport. But that's going to run over $30K. So not all that economy. That's all they manufacture now. Very few mt vehicles available at all. A couple two door sports cars.

Some multi speed automatics are still available but even they're getting fewer. Mostly in the larger vehicle segment.

As far as ev's or hybrids, seems like governments are mandating them more and more. Some US states are mandating all ev's in not too many years.
Click to expand...
The Chevy Trax are still multiple speed automatics-but the jury is out on the engine-2 wet timing belts, GDI, turbocharged 3 cylinder!
 
Yea, I looked at the Trax. There were already enough YT complaint videos about them. My guess is my cvt Mitsubishi Mirage is still going to be chugging along long after a Trax would be in the bone yard. And at a lower entry price. Mirage is 3 cylinder, normally aspirated multi port.
 
Revving2Redline said:
I've posted a picture of the data of both the high performance and the red line non-slip. I can't really wrap my head around the numbers but my feeling tells me the high performance might be better in the winter and the red line would be better for a summer application? Considerable amount of difference in the viscosity index from about two of the only fluids in a CVT I would choose. If somebody can help me out in a nutshell that would be great.

View attachment 258215
Click to expand...
I would choose the HPL CVT because of their boosted additive packages.
 
Revving2Redline said:
https://www.rumanza.com/cvt-transmission-oil-a-comprehensive-guide/

I've posted a picture of the data of both the high performance and the red line non-slip. I can't really wrap my head around the numbers but my feeling tells me the high performance might be better in the winter and the red line would be better for a summer application? Considerable amount of difference in the viscosity index from about two of the only fluids in a CVT I would choose. If somebody can help me out in a nutshell that would be great. ...
Click to expand...
The differences listed in viscosity performance won't really be important to a typical CVT. What's important is that you're using a proper fluid for the application, keep the temperatures under control and CLEAN the PAN and MAGNETS at regular intervals to monitor break-in and wear.
 
martinq said:
The differences listed in viscosity performance won't really be important to a typical CVT. What's important is that you're using a proper fluid for the application, keep the temperatures under control and CLEAN the PAN and MAGNETS at regular intervals to monitor break-in and wear.
Click to expand...
Almost 400,000 on original cvt transmission and engine
 
martinq said:
Have you had the transmission pan off before?
Click to expand...
Nope. I've always been meaning to as I already have the gasket and all the little filters and such but as much as I've changed the fluid and the fact that it hasn't even so much is given me a check light I just keep going on it. I probably should but like I said the maintenance is probably good enough I doubt much anything building up
 
I've don't even know what the measurement is for friction modifiers and the chemistry needed to make a fluid, that lube's bearings and gears, but then allows for grip between the pulleys and belt?
Its not new tech as conventional automatics, wet clutches, and wet brakes have needed this property for decades, but I don't think any fluid manufacturer publishes the tests and results that are needed for this? A static friction test at 100 Celcius and at -30C ?
In the absence of information I'm sticking with subaru's CVT fluid.
 
NibbanaBanana said:
I said that but I could not find an economy car without a cvt. The only one that I know of is the Honda civic hatch sport. But that's going to run over $30K. So not all that economy. That's all they manufacture now. Very few mt vehicles available at all. A couple two door sports cars.

Some multi speed automatics are still available but even they're getting fewer. Mostly in the larger vehicle segment.

As far as ev's or hybrids, seems like governments are mandating them more and more. Some US states are mandating all ev's in not too many years.
Click to expand...
Part of the proliferation of cvt's is due to the ridiculous fuel economy standards that are set. An automotive engineer from a major vehicle manufacturer was interviewed a few years ago and he mentioned that a 3 mile per gallon decrease could mean significant financial penalties across the board.
 
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