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Old Aug 12, 2008 | 10:28 PM
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Default Transmisison cooler lines

87 S4 auto

Are the transmission lines that come off either side of the tranny and lead to and from the cooler in the front low pressure?. Pretty sure they are but just want to check.

Thanks
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Old Aug 13, 2008 | 01:16 AM
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Is "low pressure" a techinical term? Being serious here because I don't know what the threshold would be. I just took my lines to the local hyrdraulic hose place and I'm pretty sure the guy said he would be using high pressure hose. In addition to having the hoses replaced and extended a half inch, I'm having the crimped hosed end replaced with AN fittings so I have a place to tap into to run a trans cooler in back when the time comes. What kind of PSI would be deemed low pressure Tony?
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Old Aug 13, 2008 | 02:41 AM
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Originally Posted by atb
Is "low pressure" a techinical term? Being serious here because I don't know what the threshold would be. I just took my lines to the local hyrdraulic hose place and I'm pretty sure the guy said he would be using high pressure hose. In addition to having the hoses replaced and extended a half inch, I'm having the crimped hosed end replaced with AN fittings so I have a place to tap into to run a trans cooler in back when the time comes. What kind of PSI would be deemed low pressure Tony?

"Hose clamp" low pressure adam

considering the condition of one of my hoses i cant imagine they are too high. Ive got some fuel injection hose that is the correct ID and fits very snuggly over the barbs. Im hoping that this and a good set of clamps will work for me. I took the whole assembly, before i took it all apart, to my regular hose shop that has done everything for me in the past. He said he cant do this kind of crimp on the fitting because the crimper they have is too big? and the type of pipe or something?

Im heading back up there again tomorrow with it all taken apart to see what they say.

I ask because In a nut shell my HP fuel injection hose and some good hose clamps is my last resort. a 25 dollar fix for both lines.

Ive been running with an external cooler in addition to the stock one for 4 yrs now with hose i had made and crimped...just rig it up in series with the stock cooler on the radiator...mine sits in front of the radiator area by about 3 inches. I have MORE than enough cooling and airflow. Very easy to do. Im also putting a tranny temp sensor in the pan this time around.
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Old Aug 13, 2008 | 11:51 AM
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It should hold up fine with oilresistant hose rated with a workingpressure of 10 bars. This can also be easily used along with some hoseclamps.



I´ve tried this on a Camaro in the past and it shouldn´t be any problem. Just take a look on the crimped part and you can see that it´s thin steel. Not as a true hydraulic shell that is made from about 2 mm thick steel.

And when it comes to hoses, cut your existing ones and you can see that it´s just textile and rubber in them. Hoses like that often is rated about 5, 10 and at the most 20 bars.

Your local hydraulic store should carry these oilresistent hoses.


/T
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Old Aug 13, 2008 | 02:46 PM
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Originally Posted by Tony
Im also putting a tranny temp sensor in the pan this time around.
Definitely post the details on that.

For now, I'm going to run the stock Euro/32v S external cooler in line with the rad cooler, but it looks pretty small. No hose mods though.
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Old Aug 13, 2008 | 04:01 PM
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Originally Posted by atb
Definitely post the details on that.

For now, I'm going to run the stock Euro/32v S external cooler in line with the rad cooler, but it looks pretty small. No hose mods though.
Im assuming the pan would be the most logical place as this where the fluid is picked up from isnt it?..and where it is returned from the coolers? Thus you would get the temp of the fluid after it is cooled and prior to entering the tranny internals.
if anyone knows different, let me know.
Im basically going to drill a hole on the side of the tranny pan and have a bung welded in that wil receive the sensor that came with my autometer gauge. I did the same thing for engine oil temp, works fantastic!

If I get carried away i can add another one for a T-couple...and i could log the temps on my TC4/LM1 via the laptop.
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