WR35 GTR Performance Parts

WR35 MITSUBISHI EVO X Performance Parts

WR35MP GTR PERFORMANCE MID-PIPE

WR35MP Willall Racing Mid-Pipes replace the stock heavy centre resonator and pipe section on the R35 GTR which make it sound muted and quiet, most unlike a performance car. Crafted from Super Light and tough Titanium our Mid-Pipes have the utmost craftsmanship and engineering put into their production. Each WR35MP is tested for fitment on a GTR before shipping so you can have a perfectly aligned production piece anywhere in the world.

Long section flex pipes are used to ensure the interface between the engine and exhaust is not stressed or broken even in severe motorsport applications. Pipe sizes are generous with 78mm at the front and 90mm discharge to ensure optimum gas glow. Gains are significant over stock, with the actual horsepower number dependant on the tune in place. An important bonus is the weight saving from installing WR35MP. Not only is there less exhaust back pressure for more flow and performance, but there is also a 75% (24lb or 13kg approx.) reduction in overall weight.

The best part of WR35MP though is the sound. Gone is the quiet and low hum of the stock GTR replaced instead by a glorious engine note reminiscent of the high powered early GTR models that helped forge the legend. There is no cabin drone, no loud noise at cruising speed, just a genuine powerful voice for your GTR.

Listen to the GTR Mid Pipe by viewing the video below.

Here is another great video of the WR35MP Willall Racing R35 GTR Mid Pipe recorded by our Czech customer 'Kislik'. Not satisfied with us only having the tone of WR35MP posted at idle and free-rev, he went out and made the really nice film clip at full throttle. Well done Kislik!

CUSTOMER COMMENTS

These comments have been posted directly to Willall from customers that have used WR35MP on their R35 GTR and have not been altered in any way other than to remove vehicle identity.

WR35EX GTR TITANIUM CAT BACK EXHAUST SYSTEM

Crafted from Titanium and carefully welded for the perfect finish our WR35EX Titanium Cat Back exhaust system (pictured here with WR35MP midpipe assembly) is a superb lightweight racing piece for your GTR. Saving some 20kg or 40lb from the weight of your GTR there is power to be had not only through the superb big bore 90mm pipe design but also the low restriction muffler assemblies and stunning looking burnt finish Titanium exhaust tips. Power gains depend on tune and other exhaust configuration but expect over 20hp with the engine management calibrated to match, but most of all the deep and supercar tone exhaust note will bring your GTR to life.

WR35TC GTR GR6 TRANSMISSION INTERCOOLER

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

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.

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

WR35OP GTR HI VOLUME OIL PAN

If there is one thing the GTR lacks for extreme duty use its a big engine oil capacity. The VR38DETT comes with a 5.8 quart engine oil capacity and works the engine oil hard with big temperature loading and duty cycle due to missing out on additional capacity. With this in mind we have re-modelled the original pressed tin factory pan into a two piece high volume billet aluminium sump, complete with cooling fins and removable bottom tray that takes the GTR oil capacity out an extra 1.7 quarts to a total of 7.5 quarts, reducing overall oil temperature and giving a greater reservoir for the engine to draw from.

Included in the WR35OP kit is an oil pickup extension to the move the factory pickup deeper into the new pan, which is also sealed with an O-ring, once more to give a low maintenance and high quality result. Fasteners are Stainless Steel SHCS (Socket Head Cap Screws).

In Final position the removeable lid fastens to the WR35OP oil pan giving a perfect seal and lining the factory drain plug up over the cutout in the underbody making for simple and easy maintenance.

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 -

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.

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.

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.

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.

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.

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.

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

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.

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.

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.

WR35MTT GTR TURBOCHARGER UPGRADE

Utilising technology and turbocharger design from the Spec V upgrade program Willall Racing are proud to release their new WR35TT GTR ball bearings turbocharger upgrade. Heart of WR35TT is a pair of upgraded turbochargers with a larger high flow compressor wheel, and matched turbine to deliver un-matched power and response. Airflow rates from the turbocharger compressors are rated at 45lb/min using a pressure ratio of 2.4 (around 20 psi boost). In raw terms then WR35TT can deliver up to 750ps from your VR38DETT engine.

Raw data suggests that 100awhp will be achievable, with good strong top end due to the larger turbine wheel reducing exhaust back pressure. To offset any potential gain in lag we have moved from the stock plain bearing turbocharger core to a complete ball bearing unit. Response at the bottom end should be similar to the stock turbochargers.

Complete CNC programs have been written for both the compressor cover and turbine housing (manifold) which means that exacting factory clearance and tolerance is adhered to. Internal finish is superb, with no comprimise to the physcial response of the turbocharger as very little of the all too critical 'squeeze' is altered. This is something to check with some of the aftermarket GTR turbochargers that exist!

Last but not least is the retention of the superbly engineered high quality metal factory oil and coolant lines. In this high temperature environment rubber or conventional hose simply will not last with any kind of durability. We see keeping the factory plumbing hardware as in important benefit....as from the outside there is no way of picking these turbochargers as anything but factory.

So the quick benefits of WR35TT are as follows -

• Roller Bearing Core for strong response

• Larger compressor wheel (+100awhp better from test data)

• Larger turbine wheel for reduced back pressure

• Properly measured and machined factory turbine and compressor covers

• Use high quality factory lines

• Completely stealth apperance from the outside

WR35TT Dyno Test Report

Performance Testing

Dyno figures are one thing, but with so many different types of dyno and different ways of setting them up the figures can easily get skewed, and not allow accurate comparisons. This is why we let the real performance on the track tell the story of our WR35TT upgrade with the following times being generated in the all important 60mph – 130mph roll on. A true test of power and torque and as you can see careful and correct turbocharger selection endows the GTR with high end Supercar mauling performance.

60-130mph TIMES FROM 6SPEEDONLINE.COM PERFORMANCE REGISTER

3.53 - Underground / TT Gallardo / 2-shifts
4.09 - Acicchelli / TT Gallardo / 1-shift
4.52 - jbsteven / SC&TT Ford GT 994 rwhp / 1-shift
4.53 - HoustonT / 880 rwhp Supra / 1-shift
4.87 - Oz / Supra / 1-shift
5.14 - Hllywood / TT Viper / 93 octane/ 2-shifts
5.27 – Lil Powell / C5 Vette with big motor and NOS
5.74 - Divexxtreme / Supercharged C6 Z06 / 1-shift
5.83 - RaceMX-M3 / Turbocharged E46 M3 / 1-shift
5.88 - Blacksheep / Supercharged C6 Z51 Corvette / 1-shift

6.20 - R35 GTR WR35TT UPGRADE

6.65 - Acicchelli / Renntech SLR
6.89 - Vrybad / C5 Z06TT (APS Turbo, no cats, stock muffler, 573 rwhp @ 9.5 psi) / 1-shift
7.24 - Acicchelli / Stock SLR
7.48 - Acicchelli / Renntech SL65 AMG
7.59 - Blacksheep / C6 Corvette Z51 (heads/cam, 484 rwhp) / 2-shifts
7.74 - HoustonT / GT-R / 640 HP (downpipes, y-pipe, BC, hard IC pipes, custom tune)
7.85 - Acicchelli / Stock LP640 / 2-shifts
7.86 - Divexxtreme / Stock C6 Z06 / 2-shifts
8.24 - DrivenAgain / CL600 AMG
8.45 - TMC CL65 / Kleeman CL65
8.46 - Dads C63 / Bolt-On C63 AMG
8.59 - Dr Jitsu / Supercharged M3 / 1-shift
8.67 - DLSJ5 / Supercharged E46 M3 SMG / 2-shifts
9.34 - hotrod182 / 335i w/ JB3 piggyback ECU / 2-shifts

WR35TU GTR ENGINE MANAGEMENT TUNING

Having some of the most experienced engine management tuners in the world on staff, Willall Racing are now offering their WR35TU engine tuning program to customers. Working in conjunction with Cobb Tuning, Willall have a range of specifically engineered maps that can be loaded in your Cobb Accessport unlocking the true potential of your GTR.

The Willall Racing WR35TU advantage comes from mapping your GTR for specific modifications and then matching the tune to the quality of the local fuel in your area. This way, with our broad database of test cars we have been able to formulate the perfect map for your conditions.

All of our WR35TU base mapping and development is carried out at Willall Racing using our state of the art Mainline AWD Chassis Dynamometer which offers the very best data logging and analysis bar none. Rapid fire and highly accurate information from the Mainline is one of the important keys to the WR35TU difference.

Power gains from WR35TU are dependent on application, however a stock GTR with nothing else changed can generate over 50hp (37kw) at all four wheels whilst still retaining a conservative and reliable tuning approach that ensures longevity of the engine and drivetrain. Above is an upgrade to a 2008 JDM GTR with Willall midpipe and Cobb Stage 2 97RON tuning. With WR35TU tuning we gained an additional 40hp (30kw) all with only a 1psi increase in boost pressure. Simply fill in the order form and we can email you a WR35TU map for your Cobb Accessport in no more than 48 hours.

We have WR35TU Accessport tuning upgrades for –

• 2008 JDM GTR

• 2009/2010 USDM GTR

• 2009 ADM and EDM GTR

• 2009 Gulf Spec GTR

• 2010 RSA Spec GTR

Key Features of WR35TU include –

• Reliable Power and Torque gains

• Ability to map for local fuel octane requirements

• Takes into account existing vehicle modifications

• Improved Boost Control using RPM mapping for precise boost

• Ability to drive larger than stock injectors

WR35CP GR6 Composite Clutch Packs

Designed using high friction coefficient clutch face materials and extreme bonding agents WR35CP uses its fine woven composite structure to provide up to 30% greater drive clamp and torque transfer versus standard clutch frictions at the same hydraulic apply pressure. High quality backing materials are used to promote clutch stiffness and plate strength, while friction transfer slots to eliminate heat build-up and promote fluid scavenging under extreme conditions. This high quality engineering delivers less clutch slip more grip and most of all improved street and track performance for your GTR.

WR35CP technical specifications are as follows -

• WR35CP Composite Clutch Packs (12 clutch plates per GTR)

• Material: Composite Kevlar carbon high friction

• Drive Coeff: up to 33% improvement with 0.125 friction index

• Surface Area: up to 16% improvement in clutch face surface area vs factory

• Temperature handling: Increase maximum clutch temperature point 400F versus 350F factory

• Bonding: Double bonded up to 600F resistant, chemical resistant

• Stiffness: Heat treated high strength steel construction at 68 Rockwell

• Drainage: Deep wide fluid transfer slots for maximum fluid scavenging and heat transfer

• Compatibility: Designed to work with factory and Willall transmission fluids

WR35TS Turbocharger Studs

With the number of Willall WR35TT GTR turbocharger upgrades we perform one issue is starting to become more and more common, and thats the factory studs in the factory turbine housing shearing, stripping, and generally refusing to play ball when customers remove the stock turbos to send them in. Its not really Nissans fault either as the factory studs are not designed to be reused several times (fitting downpipes etc.) hence go outside their design specification, and fail....like this -

Once the stud has got to this level it simply cannot be re-used. The natural massive turbine temperature seems to affect the metallurgy over time, so a stud that wound the nut on nicely, no longer will 10,000 miles down the track. We have to fix plenty of these that have been stripped at turbo removal time, so we came up with a solution, that being WR35TS (Turbo Studs).

We make two different studs. One is a direct replacement for the factory stud (should it come out, or not shear off), and the other is for use in the instance where the hole in the turbine housing needs to be retapped to a larger size to give some thread back to the stud. You can see the difference in the base size of the two studs. So....one for replacement, and one for repair. These studs are machined by Willall from a high grade long life temperature and corrosion resistant steel, and are designed for multiple useage without failure.

As part of any WR35TT turbocharger upgrade system we will now fit these new studs free of charge, but we will also make them available as a complete set to be purchased by anyone interested in some peace of mind when working on the 'hot side' of their GTR. Check the price on the pricing page

WR35STX EVO X Surge Tank Assembly

Suffering from fuel starvation in hard left hand corners at less than half a tank on the gauge the EVO X has its track performance hampered by a poor fuel pickup design. WR35STX fixes this issue by keeping a constant head of fuel in the surge tank almost regardless of fuel tank level, and combining with high a output Walbro fuel in-line pump allows up to 450hp of surge free fuel flow to your 4B11T engine. Installation of the WR35STX is quick and simple requiring no cutting or drilling of your EVO.

WR35STX production features are as follows -

• Thick walled design for maximum strength

• 1/3 gallon / 1.25 litre capacity for a full mintue of full load fuel reserve

• Cylindrical tank shape to avoid any chance of splitting across welded edges

• Metal line rear mounted pickup for guaranteed fuel delivery

• CNC machined fuel pump bracket

• Bolts straight in with no drilling or cutting of the body

• Allows tank levels as low as a gallon with totally eliminated fuel surge

Mounting under the car and bolting to the tow hook mounting points the WR35STX Surge Tank Assembly is both quiet, safe (keeping fuel out of the cabin) and totally free of any kind of smell or odour which can plague some internally mounted fuel systems.

We will offer the WR35TMX in two stages - due to the fact that US owners will be able to source their own external Walbro pump Stateside and save on overall cost.

1) WR35STX surge tank only OR
2) WR35STX surge tank + Walbro pump + installation kit

WR35STX EVO X Brembo Front Brake Upgrade

Having experienced serous brake fade after track testing their EVO X the Willall engineers got together and formulated a track ready solution for all EVO X models that replaces either stock solid GSR discs or the floating 72 vane MR discs with a purpose built Brembo compeition brake rotor and machined aluminium hat assembly for the ultimate in track performance. With WR35BRX brake fade is a thing of the past.

WR35BRX Features include -

• Advanced ductile competition brake disc material for reduced wear

• 72 cooling vanes for maximum heat rejection and airflow

• Lighter weight than factory discs

• Fully floating anodised aluminum hat assembly

• State of the art bobbin design

• Eliminated brake fade

• Reduced wear and improved brake pad/disc life

WR35BRX fits directly in place of your stock EVO X brake discs with no other modifications

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