Can you overcool PS fluid?

DEpointfive0 · 08-18-2013, 05:19 AM

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!

SouthArk370Z · 08-18-2013, 10:07 AM

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.

DEpointfive0 · 08-18-2013, 11:25 AM

^but at what temp?

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

gomer_110 · 08-18-2013, 12:01 PM

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.

SouthArk370Z · 08-18-2013, 12:07 PM

Quote:

Originally Posted by DEpointfive0

^but at what temp?

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

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.

DEpointfive0 · 08-18-2013, 12:15 PM

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?

SouthArk370Z · 08-18-2013, 12:36 PM

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

critical · 08-18-2013, 04:39 PM

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.

DEpointfive0 · 08-18-2013, 04:40 PM

Quote:

Originally Posted by 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.

I just texted you regarding something random

08-18-2013, 05:19 AM	#1 (permalink)
DEpointfive0 Premium Member Bitches Join Date: Jan 2012 Location: SoCal Posts: 14,824 Drives: a lot Rep Power: 17151	Can you overcool PS fluid? 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! __________________ Do YOU want to know what/where I got my username from? ( Click to show/hide ) NSFW due to language:

08-18-2013, 10:07 AM	#2 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324197	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. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

08-18-2013, 11:25 AM	#3 (permalink)
DEpointfive0 Premium Member Bitches Join Date: Jan 2012 Location: SoCal Posts: 14,824 Drives: a lot Rep Power: 17151	^but at what temp? I'm seeing online that the temp can get to 250 degrees, so what's the sweet spot? __________________ Do YOU want to know what/where I got my username from? ( Click to show/hide ) NSFW due to language:

08-18-2013, 12:01 PM	#4 (permalink)
gomer_110 A True Z Fanatic Join Date: Aug 2011 Location: Perrysburg, OH Posts: 17,992 Drives: '11 Nismo #528 GM Rep Power: 36940	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. __________________ '11 370Z Nismo #528 Fast Intentions \| Stillen \| Motordyne \| Uprev \| CSF \| Zspeed \| Z1 Motorsports \| AST \| Swift \| SPC \| SPL \| Whiteline \| Hotchkis \| Bride \| Schroth \| Robispec \| Cusco \| Nismo \| Volk \| Forgestar \| Hoosier \| RJM '17 Titan Bone Stock

08-18-2013, 12:15 PM	#6 (permalink)
DEpointfive0 Premium Member Bitches Join Date: Jan 2012 Location: SoCal Posts: 14,824 Drives: a lot Rep Power: 17151	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? __________________ Do YOU want to know what/where I got my username from? ( Click to show/hide ) NSFW due to language:

08-18-2013, 12:36 PM	#7 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324197	Look at the viscosity. It's quite high at 30-40 C. I'd try to keep it above 70 C. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

08-18-2013, 04:39 PM	#8 (permalink)
critical A True Z Fanatic Join Date: Oct 2012 Location: Washington Posts: 1,252 Drives: 09' 370z 7AT Rep Power: 15	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. luigi90210 likes this. __________________ Quaife w/ gears \|Stillen Gen 3\|SOLD FI Resonated Test Pipes \|SOLD FI 18'' \| 25row Stillen Race \| Progress 35mm/25mm sways \| Swifts/Koni\|Volk G25's\| Stoptech SS lines\|\|SPL Front/Rear Arms\|

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