flipo

I'm looking for advice on the most suited gearbox oil for an aor trans with guard 50/80LSD in my race car.I'm in Europe so info on type of oil is better than just a brand name since not all North-American brands are available here.

Thanks

Van

I only use Mobil 1 Delvac that I get through Lufteknic: http://www.lufteknic.com/Merchant2/m...ode=lubricants

dillon410021

redline 75w90

flipo

do I need to mix the redline 75W90 with friction modifier?

Duke

As I understand it the friction modifier is only for street cars that want to have a more quite and smoother operation of the LSD. But a race car should not use it.
BUT with oil there is so much different opinions...

67King

You do want to run friction modifyer in clutch type LSD's. I need to go up and post some info in the racing forum, since I've become a sponsor, but we've been seeing temperature drops of 20 degrees in multiple applications when using Millers over what is probably the more common brand. The Millers uses nanotechnology, which reduces friction, and does not break down under pressure like most of the high pressure additives you see more frequently. As a result, more power is transferred to the driven gears than heat is put into the oil. These results were in the Racer's Edge 996, a Grand Am Continental team, and similar results in many cars in Europe. I run this in my car: http://performanceracingoils.com/crx...0-nt-p-43.html

Here are some articles that were written about the stuff in Racecar Engineerin and Racetech Magazine (i.e. neutral sources, not paid advertisements):
http://performanceracingoils.com/PDF...eakthrough.pdf
http://performanceracingoils.com/PDF..._the_Gears.pdf

flipo, there is a distributor in Belguim, as Millers is new to the US, but somewhat established there. Here is what Millers' website shows: http://www.millersoils.co.uk/distrib...nd+Distributor

ausgeflippt951

67King, are you running a stock 951 box with LSD? Also, What type of Millers? Or is there only one type? Very interesting to hear.

What are your temps?

67King

Yes, though I'm replacning it with an S2 one for the better gearing. Running this will let me take offf the oil cooler, too, which is a royal PITA. Temps usually drop by ~20 degrees, but are usually measured with the temperature indicator strips, so there is a degree of error. One of the more successful F1 teams has been testing it on powertrain dynos, and they run oil "coolers" through a water bath to keep them up to operating temperatures. In terms of power output, they are having to add 300 Watts more heat to the system to get them to stay at the same temperature. That's only about 0.4 horsepower, but it is real, and repeatable.

There are two viscosities, 75W90 and 75W140. There are versions with limited slip additive for both viscosities. Transaxles will generally run the 75W90 (which is what I linked).