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Willall Racing Release WR35DF Differential Fluid

December 26, 2008

Following on from their amazing work developing a solid boundary transmission oil upgrade for the Nissan R35 GT-R’s GR6 transmission – WR35TMWillall Racing have developed a fluid upgrade for the GT-R’s limited slip differential.

Willall Racing have today released this diff fluid, known as, WR35DF, and have published a press release containing the details which we have below. A technical analysis of the reasons behind development of the WR35DF follows after the jump including magnified images detailing the Nissan standard differential fluids performance.

WILLALL RACING WR35DF Differential Fluid – December 2008

Application: Nissan R35 GTR Front and Rear Differential Assemblies

WR35DF is a full synthetic Limited Slip Differential fluid that has specifically developed and tested in the R35 GTR differentials. Engineered to drastically reduce the amount of binding suffered in the rear differential during slow speed cornering WR35DF utilises unique Solid Boundary technology to smooth rear differential chatter and drastically slow the wear process that occurs in these differentials.

Top level protection is guaranteed for the front R35GTR differential which runs a critically low quantity of fluid from the factory and can suffer from extreme temperature rise under spirited driving conditions. The low friction of WR35DF reduces temperature of the front differential dramatically and provides smooth and quiet operation under all conditions.

Grade: GL5 Full Synthetic 75/140
Additives: Solid Boundary protection pack
Application: Nissan R35 GTR Front and Rear Differential Assemblies
Packaging : 1 litre container (Complete Fill for front and rear differentials 3 litres)
Shipping: Worldwide
Cost: $70 USD per litre, $270 USD for 3 litres delivered anywhere in the USA
Available: NOW
Order: http://www.ls1turbo.com.au/pics/wr35dforderform.doc

Link: Willall Racing

WR35DF R35 GTR Differential Fluid development

By Martin Donnon – Willall Racing

Our laboratory results are now back from testing the factory Nissan front and rear differential oils as used in the R35 GTR. With over 3000 miles of hard use (enough to wear out a set of tyres on the track) we sent off a sample of both front and rear differential oil for testing under the Filtergram Microscope. Here is what we found –

A decent amount of oil is held in the rear differential assembly, enough that cooling and lubrication shouldnt be a problem for the 1.5 way LSD that Nissan use from the factory. Still after out test period there was enough wear to put some metal fuzz on the end of the differential drain plug magnet. This is what we found when inspecting under the Filtergram –

This sample taken is 1mm in diameter, its small, really small, and has been passed through a 0.3 micron filter at 150psi. Whats left is what we show you here, and is a good indication of the debris in the rear differential oil. At this level of magnification (100x) it is plain to see there is a decent amount of contamination, but to identify this it needs to be magnified further –

Now magnified 500 times we can start to identify exactly what is in the oil. Chunks of metal in the 5-25 micron range are evident due to what is known as scuffing wear. These damaged torn and protruding surfaces can easily penetrate the existing lubrication film and cause a snowballing effect of wear. This differential needed to be flushed before being filled with our WR35DF Solid Boundary differential oil.

Critically small in lubrication and obviously prone to getting much hotter than the rear differential (due to the small volume of fluid which acts as a coolant) we expected the Filtergram results from the front differential to be worse than the rear….and they were. Using the same test procedure our 100x magnification looked like this –

The colouration is different to that of the rear differential, showing that there is simply more metal and contamination in the front differential. This tends to mask some of the blue background, which is the light coming up from under the microscope slide.

Manigied 500 times the contamination in the front differential starts to become clear. Metal fragments in the size of 5 – 45 microns are evident in this sample, which doesnt include the same background contamination as the rear differential does due to its lack of clutch plates. The metal particles are indeed bigger, and need to be flushed out to stop further accelerated wear.