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Rhys Salmon
Tinkerer
NSW
Single T04

Posts: 18
Reg: 01-2010

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Tuesday, January 19, 2010 - 09:33 am, by:  Rhys Salmon (1jzt04) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hi Guys,

is it preferable to put the Trans Cooler prior to or after the Radiator for Auto?

cheers
Peter Nitschke
Junk Filterer
South Australia
UZZ30 UZZ31

Posts: 11247
Reg: 11-2004

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Tuesday, January 19, 2010 - 10:16 am, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I would suggest before the radiator.

That way the radiator can help heat up the trans fluid when it's cold, and the cooler will take a bit of load off the radiator when the trans is really hot.

Someone may have a argument for why the other way is better.
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

Posts: 5767
Reg: 03-2006

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Tuesday, January 19, 2010 - 06:18 pm, by:  Daniel Clarke (Dieseltrain) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I run mine After the radiator . No issues on cold starts or even down at the snow for 1 week last year . Still warmed up normally and ran fine .

I see the stock radaitor cooler will bring temps down some, but the outside cooler will still reduce it majorly after that .
Peter Nitschke
Junk Filterer
South Australia
UZZ30 UZZ31

Posts: 11248
Reg: 11-2004

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Tuesday, January 19, 2010 - 06:33 pm, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

do you actually see any advantage though?
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

Posts: 5769
Reg: 03-2006

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Tuesday, January 19, 2010 - 07:22 pm, by:  Daniel Clarke (Dieseltrain) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Well its been dragged pretty hardcore over the years and has done me for 70,000kms since ive had the car . Now up to 190,000kms and counting so im not going to fault it :-)
Peter Nitschke
Junk Filterer
South Australia
UZZ30 UZZ31

Posts: 11250
Reg: 11-2004

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Wednesday, January 20, 2010 - 12:15 am, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Yeah, but drags for you are only 11 seconds! :-)

It would be more impressive in a V8 as it has to last for 15 seconds.
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

Posts: 5771
Reg: 03-2006

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Wednesday, January 20, 2010 - 07:39 pm, by:  Daniel Clarke (Dieseltrain) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

LOL . But the 15 seconds isnt heated up as much due to a lack of torque ;)

Either way , run an external cooler as well . Cant hurt thats for sure .
Peter Nitschke
Junk Filterer
South Australia
UZZ30 UZZ31

Posts: 11252
Reg: 11-2004

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Thursday, January 21, 2010 - 12:27 am, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Brian Rignall
Tinkerer
NSW
V8

Posts: 20
Reg: 12-2009

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Thursday, January 21, 2010 - 08:15 am, by:  Brian Rignall (Cashmere) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

For various build cost / repair cost and other reasons, you find that the majority of manufacturers install the oil coolers in front of radiators. They are smaller and allow air to flow back over the radiator.

Specialist builders, who are not building to cost, may install the oil coolers below the radiator, or to the side of the car.

Which way is better? Well they both work!

The Soarer has space to include additional coolers at the side of the radiator, just a bit more fiddly getting on to fit.
Rhys Salmon
Tinkerer
NSW
Single T04

Posts: 20
Reg: 01-2010

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Thursday, January 21, 2010 - 09:24 am, by:  Rhys Salmon (1jzt04) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Thanks Guys, i will be installing it as a side mount. Was refering more to prior to oil going into radiator or after oil has gone through the radiator.

I think i tend to agree with Peter, not built for Drags.. just a regular old road flogging.. Do alot of road trips so really want to try and take some work off the radiator as i am having slight overheating problems at the moment anyway.

cheers guys
Nathan Cryer
TryHard
Victoria
SC400 V8

Posts: 111
Reg: 10-2009

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Thursday, January 21, 2010 - 04:10 pm, by:  Nathan Cryer (Redrodeo) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Water is better at absorbing heat than air, therefore the additional cooler should be installed after the radiator. The radiator will take the initial heat from the oil and then the air cooler will work more efficiently.
Peter Nitschke
Junk Filterer
South Australia
UZZ30 UZZ31

Posts: 11256
Reg: 11-2004

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Thursday, January 21, 2010 - 09:10 pm, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I don't even know where to begin picking holes in that statement! :-)

The "water" in question, is actually normally at 85 degrees, would that be better at removing heat than air at less than 40 degrees?

You get greater efficiency when the temperature difference is greatest, so the additional cooler would actually lose more heat if the fluid inside is hotter.

Plus the previously mentioned benefit of reducing the load on the cooling system etc.
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

Posts: 5774
Reg: 03-2006

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Saturday, January 23, 2010 - 04:08 pm, by:  Daniel Clarke (Dieseltrain) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Yes but would bring it back up again by going through 85 degrees wouldnt it ?

I run mine through the factory rad cooler 1st to absorb some heat , then the bigger drop from the nice 25-40 deg air will drop it nicely after that ;)
Peter Nitschke
Junk Filterer
South Australia
UZZ30 UZZ31

Posts: 11266
Reg: 11-2004

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Saturday, January 23, 2010 - 06:45 pm, by:  Peter Nitschke (Pen) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I think the gearbox is designed to work around the 85 degree point. The radiator would only heat it if the ATF is already cooler, which is probably unlikely if you are working the gearbox hard.

I can see your point too, that the onboard cooler works well most of the time, so the strap-on just knocks it down some more.

It would be interesting to get some actual measurements of the temp out of the gear box and then in/out of each cooler.
Nathan Cryer
TryHard
Victoria
SC400 V8

Posts: 112
Reg: 10-2009

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Tuesday, January 26, 2010 - 05:44 pm, by:  Nathan Cryer (Redrodeo) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Why do cars come with only a radiator cooler from the factory and not an air cooler? If air was so efficient why wouldn't they use an air cooler???


The normal operating temp for an auto is 215F or 101C. So running the oil through the radiator at 85C can take 16C out of the oil before going to the air cooler.

Yes it also helps with heating the oil initially to bring the box up to operating temp faster.

For every 11C over 101C you halve the life of the ATF. By installing a second cooler you also increase the overall oil capacity that also helps keeping it cool.
James Harris
Goo Roo
QLD
GT Starlet

Posts: 3405
Reg: 07-2005

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Wednesday, January 27, 2010 - 10:26 am, by:  James Harris (Haro) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)


Rhys Salmon wrote on Tuesday, January 19, 2010 - 09:33 am:

is it preferable to put the Trans Cooler prior to or after the Radiator for Auto?





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