Can you overcool PS fluid?

DEpointfive0

Well... Can you? I want to use a 19 row as a PS cooler, why? Because I have a few and it's essentially free for me.


And for the 7AT tracking guy(s)... Wstar... Or people who live in death hot climates...
What's more likely to boil first? The tranny fluid or PS fluid?




Thanks!

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SouthArk370Z

As with engine oil, you will probably want to use a thermostatic plate to bypass the cooler during warmup, but you should be fine in SoCal. May end up having to block part of the cooler; experiment.

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DEpointfive0

^but at what temp?

I'm seeing online that the temp can get to 250 degrees, so what's the sweet spot?

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gomer_110

Not exactly the same fluid but here's a chart I found for temperature vs. viscosity. I would think from an engineering standpoint as long as you stay on the lower, flatter part of the curve you'd be fine.

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SouthArk370Z

A temp vs viscosity graph should tell you what you need to know. I assume that it will be close (enough) to what is used for engine oil but don't know for sure. I'd shoot for 180-220 F operating temp unless I got a differing opinion from someone that knows what they are talking about.

Edit: I see gomer_110 posted a graph. Nice find.

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DEpointfive0

Welllll, using Gomer's graph, I would like to assume that it'd be hard to really overcool it, because 20-30 degrees C is the breaking point, and I can't imaging its hard for the car to keep it at 40+ degrees, especially when people boil it on tracks at 250


Am I wrong?

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SouthArk370Z

Look at the viscosity. It's quite high at 30-40 C. I'd try to keep it above 70 C.

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critical

Viscosity is just the fluid's resistance to flow. You don't need to get it to a certain point, unless you're talking under extreme conditions but we're not. The power steering works perfectly fine at ambient temps as it is a very viscous fluid-Redline D6 ATF has a viscosity index of 166 (110 is very high). I'm going to go on a limb and say there's no way you can overcool it.

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DEpointfive0

I just texted you regarding something random

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