WR35 GTR Performance Parts



WR35TC GTR GR6 TRANSMISSION INTERCOOLER

Intercooler fitted on GTR

Designed to deliver cooler operating temperatures to improve reliability and longevity of the R35 GTR GR6 Transmission, WR35TC is ready to fit your GTR. Pictured is a look at WR35TC from under the car showing the unique high quality billet aircraft aluminium finned sump that works in conjunction with a sophisticated pump and cooling core to achieve the best possible cooling result. Highly engineered and with every consideration put into its design WR35TC the thermostatically controlled promises to reduce transmission operating temperature without the pressure control problems other GR6 cooling system designs have encountered.

NEW RELEASE: WR35TC-F Front Mounted transmission cooler also available. Designed for those that run aftermarket exhaust systems on their R35GTR the ?F front mounted cooler option stops the cooling process being interrupted by heated air from the exhaust system. When GR6 transmission cooling with an aftermarket exhaust make sure you pick the WR35TC-F no cost front mount cooler option on the order form (see WR35TC pictures for actual cooler views).

Coming in each and every WR35TC kit are the following components:

  • Billet Aluminium CNC sump with Willall Racing Transfer

  • Bar and Plate 450mm x 100mm x 75mm cooler core custom end tanks with -6 fittings

  • Braided lines and -6 / JIC high pressure fittings (around 4 feet)

  • Mounting bracket CNC machined from billet aluminium

  • GR6 Cooler transfer Pump assy

  • Wiring harness (front to rear of vehicle from the battery)

  • WR series 200F Temperature switch

  • Replacement fill plug CNC machined

  • Magnet mounts CNC machined with captive O-rings

  • Silicone hose - custom crimp fittings CNC machined

  • P rubber lined Mounting Clamps x 5

  • Intercooler Mounting bracket

  • Mounting bolts x 4

  • Instruction Manual

TESTING

GTR lapping Subaru
Subaru WRX driver looks on at impending doom about to be lapped by the Willall Racing R35 GTR

Testing the WR35TC GR6 Transmission Intercooler correctly was always going to present a challenge, as with fluid handling it's not as simple as 'switch the cooler on its cold', 'turn it off its hot'. Also the car has to be driven HARD, there is no point in taking it easy as the temperature of the transmission is directly proportional to the lap times.

The Willall Racing GTR was tested to the limit of the RE0570 tyres and brakes (Endless pads were used). Our test driver is very quick in the car due to lots of practice and could reasonably argue our 1:17.5 lap pace at the South Australian Mallala circuit is similar to 2:10 or so at a track like VIR. Over 1.5 tanks of fuel were used in the test session showing exactly how hard the GTR was driven.

NOTE: Lap Temperatures recorded are with the warm up and cool down periods removed from the data

Test 1: WR35TC Cooler Status ON

A test to check the outright cooling ability of WR35TC and find the 'stabilise' point of the transmission temperature
Ambient: 75F - Trans Start: 195F
Lap1: 215F
Lap2: 226F
Lap3: 237F
Lap4: 240F
Lap5: 242F
Lap6: 241F

Test 2: WR35TC Cooler Status OFF

With the cooler turned off this is the raw data of temperature build up in the GR6. It gives you an idea of our punishing conditions
Ambient: 75F - Trans Start: 194F
Lap1: 220F
Lap2: 231F
Lap3: 248F
Lap4: 265F
Lap5: 272F

Test 3: WR35TC Recovery OFF and ON

Letting the transmission reach almost critical temperature we then turned the cooler on to check temperature recovery
Ambient: 76F - Trans Start: 181F
COOLER OFF
Lap 1: 231F
Lap 2: 240F
Lap 3: 252F
Lap 4: 264F
COOLER ON
Lap 5: 261F
Lap 6: 255F
Lap 7: 252F
Lap 8: 250F
Lap 9: 249F

GENERAL WR35TC PICTURES

Billet Aluminium sump
WR35TC Billet Aluminium sump complete with removable magnets to allow cleaning during transmission servicing

Billet Aluminium sump
WR35TC installation shown with the factory underbody tray removed. Once fitted the whole WR35TC system is invisible.

Intercooler mounted on GTR
WR35TC Intercooler Assembly (not mounted, but shown to represent actual size)

Intercooler mounted on GTR behind mesh
WR35TC Intercooler Assembly mounted in position and hardly visible behind the factory rear mesh

Front Cooler Assembly Mounted
FRONT MOUNT: WR35TC-F Cooler assembly sits in the spare frontal intake duct on the R35GTR. Massive airflow is available in this position which facilitates the use of a compact cooler core that retains the factory washer bottle position

Front Cooler Assembly Mounted
FRONT MOUNT: An underside shot of the front mounted WR35TC-F Cooler assembly shows its positioning right by the frontal inlet duct



WR35TC-Lite GTR GR6 TRANSMISSION INTERCOOLER

Intercooler Parts

A simple effective entry level transmission cooling solution for the GR6 transmission comes in the form of WR35TC-Lite. Representing excellent value for money (note: factory transmission pan not included), WR35TC-Lite is specifically designed to offer unique advantages over current GR6 Cooling solutions by being flexible in configuration.

The WR35TC-Lite transmission cooling system was planned with the following objectives in mind -

  • A fully functional and effective stand alone GTR transmission cooler

  • Be able to work in conjunction with existing front mount transmission coolers as an ADDITONAL cooler

  • Used in Tarmac rally where the cooling components cannot be easily damaged with debris or frontal collision

  • A starting point in transmission cooling which can be added to with either a front mount additional cooler or front mount upgrade kit

  • Low cost with the ability for a DIY installation

  • Utilises proven cooling technology

  • Can be switched around into a differential cooler if required at a later date

  • Has no effect on transmission pressure

  • Allows fitment of a secondary front mount engine oil cooler

  • Can be used with a Willall water mister for additional cooling effect

  • Light weight simple and elegant design

WR35TC-Lite is a mid-mount cooling solution mounting in front of the rear exhaust section so that its air 'signal' is not polluted by hot exhaust gasses. This is a proven cooling location that we use with our WR35DC rear differential cooler, and testing so far has shown that at within a second of Carerra Cup lap pace (a good worldwide reference line) and 75 degree ambients it is possible to consistently reduce transmission temperature by 15F-25F consistently and keep the GTR transmission temperature out of the red. Mounting position is shown here -

Intercooler Mounted

Technical aspects of WR35TC-Lite are as follows

  • German gear style VDO 6 litre per minute transmission pump

  • 13 row oil cooler core

  • 500F lines with crimped fittings

  • CNC mounting bracket (anodised) and cooler plate

  • High durability hose clamps

  • Tapered lock fitting for the stock transmission pan (comes with professional seals)

  • Wiring loom integrated with relay and operation switch (with light)

  • Anti abrasion wrap for the cooler lines

Designed to deliver cooler operating temperatures to improve reliability and longevity of the R35 GTR GR6 Transmission, WR35TC is ready to fit your GTR. Pictured is a look at WR35TC from under the car showing the unique high quality billet aircraft aluminium finned sump that works in conjunction with a sophisticated pump and cooling core to achieve the best possible cooling result. Highly engineered and with every consideration put into its design WR35TC the thermostatically controlled promises to reduce transmission operating temperature without the pressure control problems other GR6 cooling system designs have encountered.

NEW RELEASE: WR35TC-F Front Mounted transmission cooler also available. Designed for those that run aftermarket exhaust systems on their R35GTR the front mounted cooler option stops the cooling process being interrupted by heated air from the exhaust system. When GR6 transmission cooling with an aftermarket exhaust make sure you pick the WR35TC-F no cost front mount cooler option on the order form (see WR35TC pictures for actual cooler views).

Coming in each and every WR35TC kit are the following components:

  • Billet Aluminium CNC sump with Willall Racing Transfer

  • Bar and Plate 450mm x 100mm x 75mm cooler core custom end tanks with -6 fittings

  • Braided lines and -6 / JIC high pressure fittings (around 4 feet)

  • Mounting bracket CNC machined from billet aluminium

  • GR6 Cooler transfer Pump assy

  • Wiring harness (front to rear of vehicle from the battery)

  • WR series 200F Temperature switch

  • Replacement fill plug CNC machined

  • Magnet mounts CNC machined with captive O-rings

  • Silicone hose - custom crimp fittings CNC machined

  • P rubber lined Mounting Clamps x 5

  • Intercooler Mounting bracket

  • Mounting bolts x 4

  • Instruction Manual




WR35DC GTR REAR DIFFERENTIAL COOLER

Keeping the rear differential temperature of the R35 GTR in check and at acceptable levels requires external cooling, and we have achieved this with a fresh new Willall Racing cooling product.We call our R35 GTR Rear Differential cooler WR35DC and it's fully engineered from top to bottom as all our products are to work seamlessly on a track orientated or hard driven R35 GTR without cutting or drilling anything. Here are the parts that come in the complete kit -

Diff Cooler Kit

As you can see this is a fully comprehensive kit as per other Willall Racing products. Nothing needs to be cut, shut, moved, or modified to fit these parts, with the result being to cool the high operating temperatures of the rear differential that can run to an excess of 270F in the right hard driven conditions (and closer to a constant 210F when WR35DC cooled). A CNC machined mounting bracket, 13 row cooler, high pressure and temperature crimped lines and every other nut, bolt, fitting, and mounting part you need.

Mounted Diff Cooler

Here is where WR35DC mounts, up behind the rear differential, but before the exhaust system in holes that already exist in the factory R35 GTR crossmember. There are a couple of reasons for this mounting position, but the very first is to get air from the underbody transmission air scoop, and the second is to allow for ANY conventional aftermarket exhaust system. Correct - WR35DC will mount with any aftermarket exhaust, regardless of brand. We know this as it sits behind the sway bar travel arc without any interference.

Deflector & Jack Mount Adapter

Some neat touches that show the full level of the engineering we have put into this product are -
1) A new air deflector system from under the rear differential that bolts in place of the factory part and provides adequate clearance.
2) A 'Jacking Point' adatper that bolts to the undertray and means you can still jack the car off the factory point without damaging anything or pushing against any part of the WR35DC Rear Differential Cooler system when changing tires at the track.

Loom Extension

For those that already have a Willall Racing WR35TC or TC-F GR6 Transmission Cooler we have a 'double pump' loom extension that plugs in place to drive the differential pump without any wiring modification. If you have the WR35TC or TC-F then the WR35DC will be triggered by the existing transmission temperature thermostat that is already in the system. Otherwise its a manual switch system we provide with the kit with an indicator light to show when the cooling pump is activated.

Pump Bracket

If you subscribe to the above and have an existing Willall Racing WR35TC or TC-F Transmission Cooler we also have a 'double shot' pump bracket that holds both the existing transmission cooler fluid pump and the new WR35DC differential cooler pump.

TESTING

Test data from Mallala International Raceway for WR35DC R35 GTR Rear Differential Cooler - General testing observations - Weather cool and mild, 'green' track conditions.

GTRs
A pair of GTRs

Testing equipment - JK Thermocouple unit
Temperature probe placed in the differential pump line to measure temperature at the outlet of the differential (pre-cooler)

Test 1: WR35DC Cooler Status OFF

Mode: A test of differential temperature without cooling
Ambient: 64F
REAR DIFFERENTIAL TEMPERATURE (Transmission Temperature in brackets with WR35TC-F Cooler running)
Lap1: 258F (203F)
Lap2: 266F (212F)
Lap3: 277F (232F)
Lap4: 286F (236F)
Lap5: 292F (242F)
Lap6: 294F (244F)
STABILISE REAR DIFF TEMP - 290F
PEAK TRANSMISSION TEMPERATURE - 244F

Test 2: WR35DC Cooler Status ON

Mode: Testing the WR35DC Differential Cooler effect on both differential and transmission
Ambient: 66F
REAR DIFFERENTIAL TEMPERATURE (Transmission Temperature in brackets with WR35TC-F Cooler running)
Lap1: 247F (207F) * WR35DC Switched on at the end of the first lap to get 'up to temperature'
Lap2: 241F (216F)
Lap3: 230F (228F)
Lap4: 232F (236F)
Lap5: 231F (234F)
Lap6: 229F (237F)
STABILISE REAR DIFF TEMP - 230F
PEAK TRANSMISSION TEMPERATURE - 242F

If you study the data long enough you will see that quite obviously the rear differential is in need of major cooling, as it builds temperature very quickly, and then acts as a preheater on the back of the transmission assembly. Removing heat from the differential then not only preserves the life of the differential fluid it has also shown - in this test - to have a positive effect on transmission temperature at the same time. The value of adding such a system to the GTR is clear from these positive and decisive test results.

Test Data Graph

WR35DC-F GTR FRONT DIFFERENTIAL COOLER

A small fluid capacity and the ability to punish the lubricant from running at near 300F temperatures cooling the front differential of a hard driven GTR is essential. The use of a compact high efficiency cooling core allows us to integrate our new WR35DC-F Willall Racing Front Differential cooler into the high airflow 'nose-cone' area of the R35 GTR seamlessly. Bolting alongside the existing power steering cooler, and coming with its own CNC machined and anodised aluminium bracket, there is no drilling or cutting to fit the cooling core, just the removal of the top access cover with a few clips.

Coming in each and every WR35DC-F kit are the following components:

  • Front mounted cooling core

  • Machined billet CNC Pump mount bracket

  • High pressure and temperature lines and -6 / JIC high pressure fittings (around 4 feet)

  • Differential Cooler transfer Pump assy

  • Wiring harness with manual switch

  • Replacement fill plug CNC machined

  • Replacement drain plug CNC Machined

  • Silicone hose - custom crimp fittings CNC machined

  • Mounting bolts and hose clamps

Installed Diff Cooler

You can see the full core exposed here in this closeup photography and see how it sits in the airstream of the vehicle for maximum cooling effect and little of what we call 'cross pollution' of heated air with other system coolers.

Aluminium Bracket

Another custom CNC machined and anodised aluminium bracket mounts the fluid transfer pump in existing mounting location which means that the whole thing bolts straight into place, with only the lines needing to be run between the cooler, the pump and the front differential. Installation is simple, and wiring is either via an extension of your existing cooling system or a complete loom with an in-car activation switch.

Fittings

All high quality JIC crimped fittings are used for zero chance of leakage, along with our 350F and 500psi rated flexible transfer line, which when combined with our durable protective covering gives a long life high temperature solution. Note the temperature strip indicator in place...this will be used for 'after' testing. Pre tests showed that capability for consistent 300F+ in the front differential without a cooling strategy.



WR35MS GTR WATER MISTING COOLING SYSTEM

Willall GTR
When tracked the GTR can generate high oil temperatures which are lowered substantially via fitment of WR35MS in both engine oil and transmission oil by up to 20F

One of the highly efficient ways of assisting GTR cooling is via use of a fine mist of water directed onto both the factory (or aftermarket) oil cooler and (aftermarket) front transmission cooler core. It doesn’t matter whether it’s a Willall Racing or some other brand cooler, the WR35MS water misting system can improve cooling efficiency out of sight.

WR35MS Fitment

Heart of the WR35MS system are these ‘Misting Blocks’ which incorporate two fine misting jets that are designed to clip over the factory GTR front bar cutouts without any additional adhesive, and supply a fresh and cool mist over the cooling cores to drop temperatures by up to and over 20F

Water useage varies with the track conditions but on a typical two minute length lap expect to use no more than half a quart of water with the WR35MS cooling system running full time. Coming with a two gallon trunk mounted reservoir there is a serious number of laps between refills.

WR53MS Working Demo

Controlling the WR35MS system is a timer circuit that runs the water misters for an adjustable time base (from 5 seconds through 30 seconds) once the brake pedal has been activated and released. This way the water mist can be delivered when it is needed most, as the GTR is heading onto a straightaway at high road speeds.

Utilising the same rear mounted water tank as the WR35WS Brake Water Spray system the WR35MS Mist Cooling system can be either integrated with WR35WS or used as a stand alone product that is simple to install and comes complete with all of the required parts and mounting kit.