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Old 03-18-2005, 10:14 AM   #1
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Default Diff lube question

I got a used RS4 RAcer2 the other day. Its ok so far but I just wanted to tone down the diff action with the gear diffs. Should I be using thicker lube in the front or the rear if I want more steering? Also, what weights would you guys suggest?

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Old 03-18-2005, 11:28 AM   #2
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If you are running on a surface with good grip you can go with 500,000 in the front and 100,000 in the rear. Too stiff along with low grip will cause your car the loop out all the time. Just make sure that the front is always stiffer then the rear.
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Old 03-18-2005, 03:35 PM   #3
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Heavier weight oil in rear= more steering
'' " " " front = less steering.
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Old 03-18-2005, 05:36 PM   #4
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Andy is correct. I guess I should have given a bit more explanation. With the racer2 you should have more steering then you know what to do with. I used to spend most of the time trying to get more rear grip. I ran diff lock lube in the front and tuned the rear for the track. I kept a couple of diffs with different weight lubes in them to adjust. I also ran a ball diff, but couldn't keep the diff action consistant enough durring a race day. I'll paste in my last race configuration before I got a new car.

I run a racer-2 with a Nova .12 side exhaust/slide carb with a cen header and rbx12 pipe. HD 2 speed with stock

gears. 33r's with green inserts all around. 50 wt shock oil with #3 pistons all around.
super one way diff
laydown shock tower (from super nitro)
10 degree caster blocks
1 degree toe out
1 degree neg camber
red springs
no preload spacers
RRP ball diff
1-1/2 degrees neg camber
white springs
no preload spacers
Not sure what the ride heights for the front and rear are. I'm just running as low a I can with the kit shocks. I'll

be converting to the pro3 threaded shocks in a bit so I can adjust the ride height a bit lower. I also run with a

Kawahara Lola body which is why I use the laydown front shock tower.

This setup requires a different driving style because of the super one way diff. You basically loose your brakes,

I'm still trying to get the hang of it, but I'm already faster and more consistant.

Almost forgot, I also overdrive the front wheels.

I run on swept/blown parking lots and on a large high traction permanent track, which is why I chose the ball diff

in the rear. It's a bit of a pain to maintain, but its been so much easier adjusting to track conditions without

carrying around 3 gear diff with varying diff oils.
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