Front & Rear Diff fluid changes, how it affects steering?
#1
Thread Starter
Joined: May 2002
Posts: 35,030
From: West Fargo, North Dakota
Can someone explains how going from a lighter to heavier and vice versa in the rear and front diff affects steering. I understand the center pretty well, just not the front and rear.
#2
ok try to stick with me now
ok, well hopefully you know that when turning a corner the out side wheel followsw a bigger radius!! well say you put a really thick oil in either front or rear. to all most make it solid, now both wheels will have to turn the same size radius / or not turn beacause the front is al most solid, normaly when going into a corner right all the weight is on the out side wheel. and the inner just sits there a bit, with not much weight at all. you make it a locker type diff it is going to stop the inner wheel from travling it's deisered path.. hence the wheels skip.
you only really need to watch a car going around a corner with a locked diff, and here it skipping.. i know this is taking it to the extreme..
the other day my friend had a locked diff in his mi2 on road, on a high grip surface, and he snapped a front dog bone becuase there was just to much load on the axle and the tyres had to much grip so the axle let go..
ok so now a normal diff works but putting all the power to the wheel in the air? say your cornering again, the out side wheel is hard on the ground and the inner is just touching, the surface, so you power on to get around the corner quicker, but all the power goes to the wheel in mid air?( not much point i hear you say.) and your right.. so now we put a thicker oil in the car(front for now) and we do the same thing, because of the friction in the heavey oil in the front) it makes the front axle more solid to speak, so you power on again around the corner, but this time more power it going to the wheel, that is in contact with the ground, because of that in creased friction in the front diff.
i hope you can sort of understand it now.. hope i didnt confuse you even more..
but there is a fine line with to much(heavey) oil in the front
and not enough.. beacuse of the los of power
good luck hope i helped...
ok, well hopefully you know that when turning a corner the out side wheel followsw a bigger radius!! well say you put a really thick oil in either front or rear. to all most make it solid, now both wheels will have to turn the same size radius / or not turn beacause the front is al most solid, normaly when going into a corner right all the weight is on the out side wheel. and the inner just sits there a bit, with not much weight at all. you make it a locker type diff it is going to stop the inner wheel from travling it's deisered path.. hence the wheels skip.
you only really need to watch a car going around a corner with a locked diff, and here it skipping.. i know this is taking it to the extreme..
the other day my friend had a locked diff in his mi2 on road, on a high grip surface, and he snapped a front dog bone becuase there was just to much load on the axle and the tyres had to much grip so the axle let go..
ok so now a normal diff works but putting all the power to the wheel in the air? say your cornering again, the out side wheel is hard on the ground and the inner is just touching, the surface, so you power on to get around the corner quicker, but all the power goes to the wheel in mid air?( not much point i hear you say.) and your right.. so now we put a thicker oil in the car(front for now) and we do the same thing, because of the friction in the heavey oil in the front) it makes the front axle more solid to speak, so you power on again around the corner, but this time more power it going to the wheel, that is in contact with the ground, because of that in creased friction in the front diff.
i hope you can sort of understand it now.. hope i didnt confuse you even more..
but there is a fine line with to much(heavey) oil in the front
and not enough.. beacuse of the los of power
good luck hope i helped...
#3
Thread Starter
Joined: May 2002
Posts: 35,030
From: West Fargo, North Dakota
Ok, so basically with thicker oil more power will be sent to the inside wheel, which I believe will give tighter steering response?
I did go to 10k - 30k - 7k and I appear to have tighter steering response.
I did go to 10k - 30k - 7k and I appear to have tighter steering response.
#4
Originally Posted by Cain
Ok, so basically with thicker oil more power will be sent to the inside wheel, which I believe will give tighter steering response?
I did go to 10k - 30k - 7k and I appear to have tighter steering response.
I did go to 10k - 30k - 7k and I appear to have tighter steering response.
im was running 10/30/3 in my jammin and recently dropped 20 into the front and now it has TONS of on power steering
#6
Originally Posted by stevenmichael
up front you are correct!!
im was running 10/30/3 in my jammin and recently dropped 20 into the front and now it has TONS of on power steering
im was running 10/30/3 in my jammin and recently dropped 20 into the front and now it has TONS of on power steering

#7
Originally Posted by mach51
but your off power steering is less now right?
now OMG it just pulls itself around our track...im not claiming to be a great driver but i think im ok and at our track i have several 7 lap heats in 5min...never anymore than that the second week driving it in both heats i had 9 lap runs....that sealed it for me even though it didnt make me feel like i was faster i was
i also moved the upper arms to the top hole and moved the ackerman all the way back.
im also running dace towers and the shocks are laid down pretty good but it is stuck loose or wet
#9
normaly when going into a corner right all the weight is on the out side wheel. and the inner just sits there a bit, with not much weight at all.
bumm, kinda confusing here....
are u talking about the weight of the truck?usually if we turn right for example, the weight is on the right front/rear also??pls explain...hehehehe...im confuse...
bumm, kinda confusing here....
are u talking about the weight of the truck?usually if we turn right for example, the weight is on the right front/rear also??pls explain...hehehehe...im confuse...
#10
Thread Starter
Joined: May 2002
Posts: 35,030
From: West Fargo, North Dakota
I actually got that issue. I was alittle unclear on that still after reading it a few times on exactly what it affects in the handling / steering department like how they described the center diff.
#11
Originally Posted by Cain
Ok, so basically with thicker oil more power will be sent to the inside wheel, which I believe will give tighter steering response?
I did go to 10k - 30k - 7k and I appear to have tighter steering response.
I did go to 10k - 30k - 7k and I appear to have tighter steering response.
#12
Originally Posted by mr-e-maxx
Actually the thinner the oil the more power to the wheel on the inside(because it has no traction there for unloading ) the thicker the oil the more power sent to the outside wheel not allowing the inside wheel to unload as easy causing less slip action and more of a positive traction action. I hope this will help clear thing up. 





