| Jatco CVT picture, 3rd cooler visible. - Click HERE for Original Thread |
| Eric L. |
Found this on the JATCO site. Sorry had to shrink it down for posting. I still think its a cool pic of the CVT though.
In an article I've read the CVT has 3 separate coolers. We already know about the normal one beneath the radiator tank, and the finned transmission pan. However this picture shows us the third one. There appears to be a small fluid cooler in the rear of the CVT (the cube with the fluid tubes and heat fins).
Enjoy.
Edit: Just noticed I had to shrink it down so much, the fins on the rear cooling block are not visible. They are finned though. |
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| Eric L. |
| Rear fluid cooler closeup. |
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| jaak |
Wow, the difference between pics is amazing... I looked at the first one and thought, what the heck is Eric talking about, it looks like a holding tank or something... Then I scrolled down to the next pic. Totally different looking!
The other thing that caught my eye, is how polished the pulleys are... It's a thing of beauty. |
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| MightyMo |
| That looks like a fluid to fluid intercooler, like they pump radiator water through there or something. |
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| myMoo |
Eric,
I'd like to download the full picture, where do I go to get it? This is really really cool. I looked on the JATCO website and can't seem to be able to find it. Please post the URL. Thanks.
This just might be my next wallpaper! |
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| Gonzo |
Wow pretty neat picture. Can you say "cooling needed".
I pictured the belts to be thicker and fater that what they actually are... pretty thin. |
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| jaak |
Don't forget they run under compression, so the little plates lock together to form a solid rod to transfer the power.
Pretty cool design and a lot better than Audi's chain...
If you look close, the belt's probably wider than it appears at first glance. The plates have steel bands running along each side, keyed into the plates. |
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| hasaanbhutta |
| well here is some more detailed info for CVTs which i found really knowledgable.... hope it helps you guys ... |
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| Eric L. |
quote:
Originally posted by MightyMo
That looks like a fluid to fluid intercooler, like they pump radiator water through there or something.
I agree. Thats exactly what it looks like. I am glad to also know the CVT has computer controlled temperature safeties that limit performance if the fluid gets too hot. On a normal automatic, you wouldn't know until you've cooked the tranny. |
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| jaak |
| Yup, that's exactly what it does.. |
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| Eric L. |
jaak,
Very interesting. So in addition to the cooling tank beneath the radiator, the little cooling fin box in the picture runs in series in on the same circuit. I cannot imagine it makes much of a difference, but I guess its better than not having one.
If I ever do a CVT fluid change myself, I may consider installing a transmission fluid cooler. Had a B&M supercooler on the Maxima and it was wonderful - easy to install, no leaks, and very durable. |
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| jaak |
| I wonder if that would cool it too much? I seem to remember there were temperature requirements for the fluid to work at it's best. There's also at least one valve that controls it.... |
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| GMTURBO43 |
Interesting reading.
I'd be curious to see a temp gauge hooked to the CVT just for grins. I've read optimal trans temp should be between 140-180. But that is on a conventional automatic. |
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| MightyMo |
| Well, one thing that fluid intercooler will do is actually warm the tranny up if the radiator water temp rises faster than the tranny fluid temp (very likely, IMHO). |
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| Eric L. |
quote:
Originally posted by GMTURBO43
Interesting reading.
I'd be curious to see a temp gauge hooked to the CVT just for grins. I've read optimal trans temp should be between 140-180. But that is on a conventional automatic.
Operating temp for the CVT is 176F I believe. |
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| GMTURBO43 |
| Unless it has another radiator or have a transcooler built in to the radiator that is a seperate path from the engine radiator. |
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| Eric L. |
quote:
Originally posted by GMTURBO43
Unless it has another radiator or have a transcooler built in to the radiator that is a seperate path from the engine radiator.
The transcooler beneath the radiator is a separate path from the radiator. In other words, CVT fluid flows through it, not coolant. The tank runs below the main radiator coolant tank and cools by contact to the tank I think. Thats the setup of most automatics. |
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| Gonzo |
I have read vairous things... just where would you drain the CVT to do the fluid change yourself? Where does it get refilled?
Interesting reading about the Honda CVT.... no torque converter, they use a dual clutch. |
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| Eric L. |
quote:
Originally posted by Gonzo
I have read vairous things... just where would you drain the CVT to do the fluid change yourself? Where does it get refilled?
Interesting reading about the Honda CVT.... no torque converter, they use a dual clutch.
On the XTRONIC CVT, you can drain and refill the fluid via the drain plug on the pan and the filler tube under the hood.
The FSM procedure specifies draining the fluid from the CVT fluid return hose (from the radiator tank) and then refilling with the engine running until fluid comes out again. This would essentially be a complete flush of the system. |
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| cschmidt |
Dave,
I used to help my Father-in-Law plow snow in Buffalo in the 70's. He had a Chevy pickup with an automatic. He also installed a temp guage for the trans. In normal driving it would be around 160*. Plow 1 driveway in 4wd High range and the temp would shoot up 20*. Keep plowing like that and it would rise even more. He insisted we use 4wd Low range. The temp never moved above 160 in Low range. That trans lasted 7 years of plowing 70 driveways and parking lots a night. Others that used 4wd High range would be lucky to get 2-3 years out of them.
Chuck |
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| MightyMo |
| I disagree Eric, look closer at that second pic that Jaak posted, it's clearly marked as radiator water coming from the heater core hook-up on the firewall. |
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| Eric L. |
quote:
Originally posted by MightyMo
I disagree Eric, look closer at that second pic that Jaak posted, it's clearly marked as radiator water coming from the heater core hook-up on the firewall.
Oh I meant the lines leading out to the tank beneath the radiator, not the cube shaped finned cooler at the rear of the CVT. I agree with you completely that the cube shaped cooler is as you described.
Two different cooling circuits, it looks like! |
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| MightyMo |
| More the marrier! If there is excess cooling capacity in the CVT system it'll actually help keep the radiator system cool :4: |
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| Gonzo |
| Could someone circle or mark on these images where you drain the CVT and add fluid to the CVT? I'm just following where to it. |
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