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Location:
Brisbane
Registered:
May 2002
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Diff oil cooler
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Mon, 05 April 2004 04:59
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I'm toying with the idea of installing an oil cooler on my Supra to increase the longevity of the diff. Does anyone have any experience with this? How would one go about installing such a system on a diff not originally designed for it?
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Location:
Sydney
Registered:
March 2003
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Location:
sydney
Registered:
May 2003
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Re: Diff oil cooler
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Mon, 05 April 2004 05:27
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Yea its pretty straight forward. You get a fitting that goes into the drain plug of the diff. Then run a line from there to one side of the diff cooler then a line from the other side of the diff cooler that runs back into the filler hole of the diff.
Now the choice is up to you where you mount your pump. You can mount the pump so that it draws directly from the drain port and pushes through the rest of the system. Or you can have the pump draw through the entire system and dump back into the filler plug hole.
Both ways work but the second is a little more practicle.
And yes they do work well and keep the temps down. I have seen setups that have a themostat switch in them so the pump turns on during hard driving.
Which of course is always. 
Cheers Steve.
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Location:
Brisbane
Registered:
May 2002
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Re: Diff oil cooler
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Mon, 05 April 2004 06:11
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Cool, that's pretty much what I had in mind. The reason I'm considering this is because I know my diff gets very hot; after hard driving I get a fair amount of oil coming out of the breather. This is just driving it on the street, so imagine what will happen when I take it out on the track!
Rigging up a small cooler and oil lines is easy enough, but what about the pump? I imagine a special pump would be required, any ideas?
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Location:
Perth
Registered:
June 2002
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Re: Diff oil cooler
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Mon, 05 April 2004 06:24
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I am in the proccess of fitting an oil cooler to my diff and one to my transmission also.
The only pumps I have been able to find so far have been a Tildon unit ex USA, and also CAPA do one for their supercharger kits. Both are suitable for this application.
Gabe
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: Diff oil cooler
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Mon, 05 April 2004 08:11
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Just get some fins welded onto the center of the diff housing. This seems to be the trick on a few dozen Escort rally cars I've seen over the last few weeks.
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Registered:
May 2002
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Re: Diff oil cooler
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Mon, 05 April 2004 08:55
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| Norbie wrote on Mon, 05 April 2004 16:11 |
Cool, that's pretty much what I had in mind. The reason I'm considering this is because I know my diff gets very hot; after hard driving I get a fair amount of oil coming out of the breather. This is just driving it on the street, so imagine what will happen when I take it out on the track!
Rigging up a small cooler and oil lines is easy enough, but what about the pump? I imagine a special pump would be required, any ideas?
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When I take my car on the track, the diff is required to work <euphemism> fairly hard </euphemism>. At the end of several sessions, it can leak a small amount of oil (ie. a drop or two), and so I imagine it's getting quite hot (and expanding the joining surfaces just "that much"), as it never does this in "normal" driving...
Given what you're putting through an F-series diff, it's reasonable to assume that it is also working hard...My point? Just that (in my never-ending quest to run things as cool as possible), I was also thinking about going this route...If I can get a diff-cooler fitted, and an engine-oil cooler, I'll just about have it done!
I wonder if anyone makes a complete "kit" for this purpose? (ie. cooler, lines, and pump... *shrugs*)
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Club Member
Location:
sydney
Registered:
May 2002
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Re: Diff oil cooler
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Mon, 05 April 2004 10:09
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TRD do a diff cooler kit for the AE86 which should fit the same way. Ive been looking at adapting the P/S pump from and SW11 but i cant find a pump ( except for $2K at trade brand new from toyota) to use for a trial.
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I supported Toymods
Location:
Perth, Western Australia
Registered:
December 2002
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Re: Diff oil cooler
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Mon, 05 April 2004 13:56
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Wouldn't a P/S pump push to fast to be truely effective? I'd personally be heading towards the Mocal range, and would have the pump pushing, over pulling in any setup.
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Location:
Brisbane
Registered:
May 2002
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Re: Diff oil cooler
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Tue, 06 April 2004 00:20
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Thanks for the info guys, all very useful!
I'm also thinking about doing a similar thing for the transmission (I think I've proven transmissions get a pretty hard life in my car), but my plan is to install a temperature gauge first to see if it's getting hot enough to warrant a cooler. I'll keep you all posted.
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Location:
Oakleigh, Melbourne
Registered:
August 2003
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Re: Diff oil cooler
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Tue, 06 April 2004 07:39
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i think u'll find that anything that can be cooled is whorth while doing 
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Banned by his request
Location:
moved to tamworth
Registered:
July 2002
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Re: Diff oil cooler
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Tue, 06 April 2004 10:46
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vdo do a pump which most of the v8 supercars use. ive sold a few to them but they are around the $380 mark from memory. they are small so fit anywere.cooler isnt really needed for the street.
mick
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I supported Toymods
Location:
Sydney
Registered:
August 2002
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Re: Diff oil cooler
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Tue, 06 April 2004 11:04
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Aussie R32 GTR's had a Rear Diff Cooler, I think that maybe the R33 V spec models had the same.
I saw one exactly like this at a wreckers for $350 complete
(Pump, core, hoses, mounting bracket)
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Location:
Sydney
Registered:
July 2002
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Re: Diff oil cooler
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Wed, 07 April 2004 01:51
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| Cool1 wrote on Mon, 05 April 2004 18:11 |
Just get some fins welded onto the center of the diff housing. This seems to be the trick on a few dozen Escort rally cars I've seen over the last few weeks.
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Yeah I agree this would be a good start. On my MA70 LSD its got some fins in it already, so this should be a bonus on a diff that doesn't have any already.
I'd also like to hook up a transmission cooler for mine. I've still got the stock MA70 (auto) cooler ready to go.
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Banned by his request
Location:
moved to tamworth
Registered:
July 2002
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Re: Diff oil cooler
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Wed, 07 April 2004 03:55
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i suppose i should have added!even racing you only need a diff cooler for endurance work. sport sedan dont use them because they only do 12 to 13 laps etc which is about 40-60km. most top ten cars have around the 650hp mark with 580-620 fp of torque. they dont need coolers same as a road car. diffs either a 9inch or hewland do it easy 40-60km so its the same with street cars as your not going to do more than 200km at hi speed{not telling were}. money better spent on good diff oil,decent breather and good bearings and gears.ive split a 9inch pumkin in half with power but never overheated a non endurace race car diff.
cooler wise a good endurance car will have an oil,fuel,gearbox,diff and power steering cooler(mainly only on tight tracks).
mick
p.s ive done from goondawini to dalby (230km} in 1 hour 10min
with a ae93 with a c52 box so i dont think you need one unless you have cash to burn.
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Location:
Melbourne
Registered:
May 2002
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Re: Diff oil cooler
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Wed, 07 April 2004 04:20
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i know people hasve sucessfully used diesel fuel pumps as gearbox/diff oil pumps.
gtr oil pums setup is over $2k from nissan - and waso nly fitted to the aussie delivered r32's. no others got them
T
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Club Member
Location:
sydney
Registered:
May 2002
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Re: Diff oil cooler
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Wed, 07 April 2004 06:15
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personally i wouldnt do it for the street or for occasional trips to wakefield etc.. but for off road applications they are pretty much a must on older diffs due to the torque application increasing the heat during wheelspin. Thats the only reason ive looked at it so far.. but youll see a lot of the guys running T series diffs in rally dont use them, but change the diff oil every meet.
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Location:
Sydney
Registered:
May 2002
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Re: Diff oil cooler
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Wed, 07 April 2004 06:24
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And change gearbox oil after every 2nd rally is a must, at some $15 a litre for gearbox and diff oil, its an expensive exercise but its worth the insurance. I know i cant afford $2500 for a new gearbox gearset or diff 
Ben
AE86 Trueno 4AGE
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Location:
Brisbane
Registered:
June 2003
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Location:
Brisbane
Registered:
June 2003
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Re: Diff oil cooler
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Tue, 08 June 2004 11:19
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an idea, it must be possible to use the drain and fill holes in the ma61 diff for the return and feed lines for the cooler?
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Location:
Brisbane
Registered:
May 2002
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Re: Diff oil cooler
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Tue, 08 June 2004 12:07
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Nah, this plan has gone on the backburner for a while, I'm busy with other stuff (eg pulling a pair of Supras apart). I do intend to pursue it again when I get the time though!
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Location:
Brisbane
Registered:
June 2003
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Re: Diff oil cooler
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Tue, 08 June 2004 12:09
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ill tell you how i go mate...maybe we can share plans of attack
No idea what pump i should look for?
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Diff oil cooler
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Tue, 08 June 2004 12:19
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There's actually a pump for this purpose in the Goss catalogue, I'd imagine you'd be able to order it through any auto parts place. Not sure on the price, I'd imagine several hundren bucks. Only thing is, I haven't noticed anybody mention fitting a filter yet! 
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Location:
Brisbane
Registered:
June 2003
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Re: Diff oil cooler
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Tue, 08 June 2004 12:30
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i think this would be very difficult...
Youd need a valve so there is always the right amount of oil in the diff, not too much just being tossed around...
a lot more than meets the eye i suspect.
I guess ghowever i need it if i want to use the lsd wen i want to race the car...
Blake
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Location:
Perth
Registered:
July 2003
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Re: Diff oil cooler
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Sun, 14 November 2004 13:53
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Hey Norbie,
is your truetrak still running hot, or was it just a bit of running in?
I finally got mine in over the weekend, and after 20 minutes on the highway the fins were quite hot (could only just hold my hand on them). I'm not losing any fluid though.
Anyone else recently installed a truetrak? Luke?
Anyone running a stock F series LSD care to take their car for a run & then feel the diff?
Thanks
Peter
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Location:
Brisbane
Registered:
May 2002
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Re: Diff oil cooler
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Mon, 15 November 2004 00:26
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Any diff will get hot to the touch after a drive, that's normal. Boiling fluid on the other hand is not normal!
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I Supported Toymods
Location:
melbourne.vic.au
Registered:
May 2002
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Re: Diff oil cooler
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Mon, 15 November 2004 00:33
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The Truetrac diff temp feels normal compared to stock in the MA61 after doing 100km drive. What Diff oil you are using?
Cheers
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Location:
Brisbane
Registered:
May 2002
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Re: Diff oil cooler
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Mon, 15 November 2004 00:49
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Yes mine feels "normal" as well after a 100km drive, but 100km through the mountains at mostly WOT = boiling fluid. Something to do with 305rwhp I guess.
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Location:
Perth
Registered:
July 2003
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Re: Diff oil cooler
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Mon, 15 November 2004 05:04
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Thanks guys - nothing much to worry about then.
I'm using redline 75W90 synthetic, so it should be running as cool as possible.
This morning it looks like it has developed an axle shaft seal leak - so it's back to the diff shop 
Peter
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Location:
S.E suberbs, Vic
Registered:
December 2003
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Re: Diff oil cooler
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Tue, 16 November 2004 22:22
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wouldnt it be possible to just setup an oil coiler that comes off the entre/exit that used natural convection? as in the oil comes out the top cools down and sinks to the bottom? I know you would have to put a bit more oil in than normal for this but a fitting could be put on the back of the diff instead I guess. But again I guess it coems to it being worth the bother.
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