[RS Barn]

I've just installed a trans Cooler in Firehawk racecar. I'm using OS Giken Racing LSD and getting up to 100 % lockup under acceleration. This puts lots of heat to trans. When we change trans oil it looks beat.

A cooler is standard on 951S transmissions .

I talked to Eric at BAT and he had a nice pump and couplings that replace stock fill and drain plugs with a few adapters.

We hooked up a temp guage and thermoswitch to turn on pump at 195 degrees. You don't want pump to try and move 75/140 gear oil when cold.

This is anticipation of installing my 305HP GT Motor this winter

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[Scott Collins]

cool...

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[benspeeder]

Nicely fabricated - cool...in so many ways...

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[RS Barn]

Can't wait to drive again and test oil temps. Theres a test day at Roebling this Sunday. Wish I could get out of 20 degree weather and go

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[savvas968]

has anyone tried a small 10 row x115mm matrix oil cooler

for the 968 transmission?

i was told that the cooled oil should be injected back to the

point where the gears mesh,as it where the heat is generated,

apart from the heat produced by the tight lsd.

mine is 80% .



my questions are

1.where to you feed back the oil into the casing

and where do you mount the thermal switch to switch the pump

on?.thanks

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[Lim Yong]

The Tip has an trans cooler on the driver side front. The trans oil is routed to the radiator,

then to the oil cooler, and then back the trans. Will that work? Is there a pump for the Tip?

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[RS Barn]

We return oil at top of trans case over gear sets. We put the temp relays and thermoswitch at bottom of diff cover. This way they are imersed in oil and give an accurate temp reading.

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[Eric_K]

Thats not a 968 6 speed box in the picture. What is it?

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[savvas968]

Thanks ,the picture paints a thousand words.



Curious though,how to you return the oil back to the gears on top.

Although the transmission in the picture looks a 951 ,the 968 has no entry on top.

If not mistaken the 951 has a breather on to.Is the return through that?

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[RS Barn]

Secret racing trans-don't tell anybody

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[MC968CS]

Hi. How often should the oil on the os Gicken diff be changed please ? What oil do we use too? Thanks

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[firefish]

The Giken is a clutch type LSD right? And since friction translates to heat I imagine that the tranny can run hot. Now, I haven't worked on a LSD but shouldn't 100% lockup as in your case (in clutch type) put LESS heat on the trans (ie no slippage, no heat being generated) than compared to a slipping diff?



How 'bout a torsen diff, are they generating heat too?

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[savvas968]

Having experience with both clutch and torsen here are some of my experiences hving both on the same car and same operating conditions.



The tighter the clutch type the higher the heat generated each time it operates ,as it is based on friction principles between large

discs surfaces grinding against each other.



being 100% it does not mean is always 100%.This condition may be at sudden acceleration ,cornering or sudden deceleration(depending on the ramp angles)

when there is enough force to overcome the preload.If there is no spring disc to preload and the discs either 6 or 8 or 12 are locked solid in the casing

the diff will act solid ,like drag racing diffs,without diff action at cornering.

.Hence the title,Limited slip differential.



by comparison,Torsen generates very little add heat when is operating ,as it acts as open diff during deceleration,and the friction is on the gear surfaces

onle and the tiny preload spring discs inside.



For track use the disc type is far superior as it can offer more adjustabilty and aadd engine braking at the wheels,which means you can go much deeper into the corner.Trust my experience is usefull to all.

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