Thread: New Allisport transmission cooler

How much larger is it than factory? I ask as there doesn't look to be much room in there to fit. The other issue is that you've got to remove the radiator and intercooler (which is a painful job) to fit where the aftermarket additional coolers fit behind the grill without all that removal.

Originally Posted by PhilipA

connects to the original couplings

Not necessarily a benefit. Whilst it makes installation easier and neater and more factory the original couplings are known not to be the most reliable.

I assume the fittings are at the back of the picture:

NAS-and-50th-Oil-cooler-2-lo.jpg


EDIT: I assume this is it Discovery 2 TD5 Auto Gearbox Oil Cooler - AlliSport GBP 268.00 ex VAT plus 64.04 for shipping for a total of 332.04 or AUD $564.48.

DescriptionUprated automatic gearbox oil cooler
these are designed as a direct replacement for the original oil cooler and is designed to connect with the original pipes.
High performance aluminium core with over three times the cooling capacity of the original design.
Ideal for vehicles that are used for towing or overland in hot climates.
Fully TIG welded design ensures superior strength and reliability.
We are able to produce oil coolers and radiators any size and shape, please enquire.

"3 times the cooling capacity"

I can only assume that means it will remove 3 times the btu's of the original?

Funny it's a different picture in LRO which shows the stubs. I wonder why the price is different also . I like Allisport's price better!

You have to also consider that you are placing yet another obstacle in front of the condenser and radiator if you put an aftermarket cooler in the front.

Regards Philip A

Another factor to consider is that you don't want to over cool the automatic transmission. Too much cooling prevents it from being able to reach operating temperature or makes it take longer to do so which increases wear and tear inside the transmission and results in worse fuel economy.

so what are we hoping for?
less than 100, more than 80?
but when?
dont say all the time because thats not how the system is set up,,

all I'm thinking is
when you add an extra cooler it takes the top off the gearbox fluid temp range,,
and yes twr7cx,, also the bottom off the bottom
until a thermostat is added there will be lots of temp variation,
LR were concerned enough to add one to their cooling system..
but not ZF ,,

as the penalty for overcooing is just wear and tear and fuel,,
it has to be better than the penalty for not cooling enough..

anyway enough of that,,

Do you think the new Allisport better than the P38 cooler?

Originally Posted by Pedro_The_Swift

so what are we hoping for?
less than 100, more than 80?
but when?
dont say all the time because thats not how the system is set up,,

all I'm thinking is
when you add an extra cooler it takes the top off the gearbox fluid temp range,,
and yes twr7cx,, also the bottom off the bottom
until a thermostat is added there will be lots of temp variation,
LR were concerned enough to add one to their cooling system..
but not ZF ,,

Advise by Ascroft Transmissions:

What oil temperature should my ZF be running at ?
There is a good guide to oil temps here, also to see the max transmission temp see here,

Ashcroft Transmissions

So check out - Transmission Oil - as recommended.

Essentially:

• don't exceed 149*C maximum termperature at the torque converter outlet to cooler. The Discovery 2 temperature switch is located later in the system near the oil cooler once the fluid has begun to cool already.
• 65.5*C minimum operating temperature at the sump. I've found my Disco 2 won't engage the torque converter lock until it's at least at 40*C. Until then it remains unlocked to build up temperature.
• 80 - 93*C is the normal operating temperature at the sump.
• 135*C maximum sump oil temperature for short bursts (e.g. hill climb).
• 149*C at the sump is when "...internal transmission parts, including warpage of metal parts, degradation of clutches, and melting of seals. Transmission oil oxidizes, (forming varnish-like substances causing further clutch slippage and compounding heat build up) and transmission oil life is extremely short."

Originally Posted by Pedro_The_Swift

as the penalty for overcooing is just wear and tear and fuel,,
it has to be better than the penalty for not cooling enough..

I would suggest that that is over simplifying it. If you run it too cool all day every day that minor additional wear and tear will compound and add up.

Here is the ad as appeared in LRO, and it looks different to the Allisport site.


Attachment 125524

Just on the temperature thing I use Castrol Transmax Z which is approved by ZF and also Castrol claims it reduces transmission temps by 20C. I have never had a trans warning light on in my RRC or D2 unless the sensor was cactus.

I just did a double change on my trans after 50KK as a workshop topped it with DEX 3 when they did work on the LT230. No chunks at all and just a slurry on the magnet at 189KK. And that is after towing in 40C plus .
Regards Philip A

Originally Posted by PhilipA

I have never had a trans warning light on in my RRC or D2 unless the sensor was cactus.

By the time the factory automatic transmission oil temperature light comes on it's too late (this is well known and plenty of threads already discussing this). Its due to the location as the temperature sensor is at the front of the vehicle on the D2 where the cooler is. This is a much cooler temperature position than measuring at the gearbox where the fluid has just flown out of the torque converter. The temperature difference can be quiet extreme - if it's reaching the 150*C required to set the factory light off then the TC temperature is much much much higher than that!