Earl’s Twin Cooler for Lancer Evolution

This article was contributed by Dennis; Ex-Evo owner and DIY Maestro.

 Turbocharged cars are notorious for their ability to overheat while being pushed hard, so much so that many of the high performance turbocharged production cars come from the factory with some form of heat management for engine oil – some do it via a water-to-oil cooler as per Subaru and others with a air-to-oil arrangement such as the Lancer Evolution.

The standard Lancer Evolution IX is a pretty capable car on the track but the one crippling problem it faces on the track is heat management – oil temperatures hit north of 130°C after just pushing 3 hot laps at Pasir Gudang. If you intend on taking your Evo down to the track often, you will quickly find that the standard oil cooler to be insufficient to meet your cooling needs especially in our blazing tropical climate.

The subject car in this example was built to be track-capable machine and yet be civilized enough for daily use. Some engine strengthening work was performed to cope with the APEXi RX6 turbocharger kit which replaced the standard item and this combination makes well in excess of 500bhp.

This car has plenty of power to have fun at the track yet the owner is unable to let the car loose on the track for more than 3 hot laps at any one time as the dreaded oil temperature warning lights will start flashing to show oil temps to be in excess of 130°C. Proper heat management in this example is even more critical as the RX6 turbocharger relies solely on oil for lubrication as well as cooling. Overheated oil will cause a breakdown of lubrication for the engine and can catastrophic failure of the turbo.

To ensure that this catastrophic loss of lubrication does not occur, the oil cooler setup for the car had to be upgraded. After doing some research, we found several standard options commonly available in the market.
- to add another standard oil cooler core to be placed on the passenger side, some custom work required for the lines and a stock core needs to be located.
- to install an aftermarket oil cooler kit which added an additional core on the passenger side, like the HKS Oil Cooler kit.
- to replace the standard core with an aftermarket core

After seeing how some of the above-mentioned setups held up to track work, we went whole hog and went for a twin cooler setup featuring two 25 row Earl’s Temp-a-cure oil cooler cores. The twin coolers were installed behind a Test & Service bumper which featured large intake ducts for the oil coolers and evacuation vents at the sides to ensure consistent airflow through the cores.

One commonly neglected aspect of installing a custom oil cooler kit is having shrouds built around the core to direct available airflow through the core to maximize its effectiveness. A simple shroud was made from lightweight plastic and moulded to fit snugly behind the bumper to give a ram-air effect to the oil cooler cores.

 

The results are exactly as we expected for the car.. A picture tells a thousand words so take a look at the peak value for the oil temperature – this photo was taken after the car had done 7 hot laps at Pasir Gudang.

A peak of 107°C and when the car came back into the pit area after cool down lap, the oil temperature was hovering just about 90°C – we have finally eliminate the demons of oil temperature.
This is a huge improvement from the standard setup and is highly recommended for everyone who intends to head to the track often.

Points to note:
1. Test was performed on 29th June 2008-07-04
2. The same engine oil of the exact same grade was used for the original track session in Pasir Gudang and this recent test after the oil cooler upgrade
3. Test was done at between 4 to 5pm as the track was too crowded earlier.

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