410 , diff oil help ??

[shaun m]

hi can someone please explain in simple terms , on how different diff oils make the car react , im running on astro (@ torch ) am currently running 15f and 5k rear , but have been advised to run 10k all round ..

cheers

[OneKiwi]

Have a read of the Xray set up book

Click

EFFECTS OF DIFFERENTIAL OIL REPLACEMENT
DIFF OIL THICKNESS CHARACTERISTICS
Front
Thinner
• Increases steering into corners (off-power)
• If oil is too thin the steering may become inconsistent,
especially it can lose forward traction (and steering)
during acceleration out of corners
Thicker • Increases stability into corners during braking
• Increases steering on-power at corner exit

Center
Thinner
• Front wheels unload more during acceleration
• Decreases on-power steering (reduces oversteer)
• Easier to drive on rough tracks
• If a high-power engine is used you could waste too
much power and sometime “cook” the oil in the center
differential because it “overloads”
• More off-power steering
Thicker
• More all-wheel drive effect
• Better acceleration
• Increases on-power steering (reduces understeer)
• Better suited on high-bite, smooth tracks
• Car can be more nervous to drive especially if a high
power engine is used - you might need to be smooth on
the throttle

Rear
Thinner • Increases cornering traction
• Increases steering into corner
Thicker
• Decreases rear traction while cornering
• Reduces wheelspin

[shaun m]

Originally Posted by OneKiwi

Have a read of the Xray set up book

Click

EFFECTS OF DIFFERENTIAL OIL REPLACEMENT
DIFF OIL THICKNESS CHARACTERISTICS
Front
Thinner
• Increases steering into corners (off-power)
• If oil is too thin the steering may become inconsistent,
especially it can lose forward traction (and steering)
during acceleration out of corners
Thicker • Increases stability into corners during braking
• Increases steering on-power at corner exit

Center
Thinner
• Front wheels unload more during acceleration
• Decreases on-power steering (reduces oversteer)
• Easier to drive on rough tracks
• If a high-power engine is used you could waste too
much power and sometime “cook” the oil in the center
differential because it “overloads”
• More off-power steering
Thicker
• More all-wheel drive effect
• Better acceleration
• Increases on-power steering (reduces understeer)
• Better suited on high-bite, smooth tracks
• Car can be more nervous to drive especially if a high
power engine is used - you might need to be smooth on
the throttle

Rear
Thinner • Increases cornering traction
• Increases steering into corner
Thicker
• Decreases rear traction while cornering
• Reduces wheelspin

yeah cheers i have that , but i was after anything purely for a 410 , or recomendations for oils etc ..

[mattr]

I've settled on 10 front and 7 rear, been running that for about a year with occasional attempts at 10 all round, 10/5, 7/5 and 15/10. And maybe some others :/
10/7 seems to be ok in most situations that i've come across (admittedly only carpet and astro so far). Heavier front seems to be the one "rule" that no-one breaks!

Don't actually think i've seen 15/5 on any of the team driver set ups (but then, i've not looked for a while!)

[jo90]

Not that I have run this, but from what I have read and seen setups for the above rule is right (heavier front to rear). How quickly can you rebuild a diff ? Reason I ask is it may be worth actually trying out a change yourself and run it back to back. I have done this with the 210 one club night. Yep, it was manic in between races in a way, but it meant i could feel the difference on back to back runs.

I would perhaps given it's 4wd try to change one diff at a time, starting with the front. So say you start with a F-15K > R-5K try changin it to F-10k > R-5K and see how the car changes. Are lap times faster/are you more consistent driving with the change ?

I also employ this process too. A change may make your overall faster laps slower, but if he helps you stay more consistent over an entire 5 minutes so you end up with a faster oberall time this also I feel is a positive change. Seems like going backward to go forward i admit, but it has helped in some cases.

[mattr]

A durango diff remove-strip-empty-fill-rebuild-refit takes about 20-25 minutes.
I have two or three spare, filled diffs ready to go in the cases, so more like 10 or so minutes.
(I think its 7 screws at the back, 9 at the front to get to the diff itself, then another 4 to crack it open.)

Unfortunately, i've managed to rub off the oil weight that i cleverly wrote down on the cases.

[shaun m]

thanks for your help , the reason why i set it up with 15-5k was thats what was in there before ( i bought it 2nd hand ) and i just freshened it up !! but want to learn whats best to run under certain circumstances , high / low grip , loose rear or understeer etc .. cheers