Diff oil change-out (I think I went too far!)

[militarymaxx]

I thought I would try one of EP's setups and changed my diff oils from 5K-7K-3K to 50K-100K-30K. Everything is bigger, better, faster with the new oils except the rear end wants to pass the front on every corner. The front seems to be biting just fine but the rear breaks loose and she spins out. Did I go too much on the rear diff (30K) or did I miss the mark somewhere else ?

 

[uDi_MP7.5]

those high figures might be fun for bashing but their not really race setups.

no idea about the 30 in rear, (too high if anything)
but a high figure in the center diff will transfer a lot of power to the rear, hence the happy rearend effect.

Under natural circumstances, the rear end squats on accel, the front rises up, and the 7k in the center lets the diff disengage a little and good amount of power gets sent to the end with the least traction, the front end. So your front end usually pulls you around the on-power corners. When there's 100k in the center, a tonne of power is going to the rear regardless of what you're doing, and it's going to want to swing around.

And all else aside, it's probably going to corner like trash because the diffs are really being held back from doing the job they should.

Try dropping back to something more reasonable all round, and your problems should be cured. As usual, thickest in center, medium up front, and thinner in rear.

 

[El Pirata]

Remember with the 100k in the center you are just a few steps below a solid center diff. Controlling that can be attibuted to the 100k in the center. Some people to make it easier to control will put 10k in the rear or you could drop the center to 70k.

Be advised that it will take a little getting used to because you literally have a completely new running buggy unlike anything you have been normally running before.

Just a question, you were sporting some wood when I showed you how thick 100k was in the bottle? Be honest, you were...

 

[Russ Winn]

Question for Pirata: I just got my 1/8 scale Ofna...this is a new animal to me. What suggestions can you give for basic setup (shocks, diff, tires) for general use out at the base?...I'd appreciate any help.

 

[militarymaxx]

EP - Oh yeah, thick stuff that 100K. Not really fair to call it a
"liquid". I wonder if I changed the rear oil out to something much, much lighter and left the front and center alone. I hate messing with these setups with the bash so close.

 

[HumboldtBlazer]

Originally posted by uDi_MP7.5
those high figures might be fun for bashing but their not really race setups.

no idea about the 30 in rear, (too high if anything)
but a high figure in the center diff will transfer a lot of power to the rear, hence the happy rearend effect.

Under natural circumstances, the rear end squats on accel, the front rises up, and the 7k in the center lets the diff disengage a little and good amount of power gets sent to the end with the least traction, the front end. So your front end usually pulls you around the on-power corners. When there's 100k in the center, a tonne of power is going to the rear regardless of what you're doing, and it's going to want to swing around.

And all else aside, it's probably going to corner like trash because the diffs are really being held back from doing the job they should.

Try dropping back to something more reasonable all round, and your problems should be cured. As usual, thickest in center, medium up front, and thinner in rear.

I echo this post, that is a basher setup or a VERY chunky track like I have never driven. You diff oil needs to be changed especially if you are using the stock GS .21

 

[El Pirata]

Originally posted by HumboldtBlazer


I echo this post, that is a basher setup or a VERY chunky track like I have never driven. You diff oil needs to be changed especially if you are using the stock GS .21

I have had that weight in my storm for 6 months without problems. My inferno runs that setup too as do my Kanai's.

 

[HumboldtBlazer]

Did someone say something?:shrug:

 

[Çh®i§tiªñ]

5k fr, 7-10k center, and 1k rear. No problems at all.

If you are going to go HEAVY HEAVY, the ONLY diff I suggest doing that in is the center. As the front and rears will unload when and if need be. If you were racing, on a track, you probably wouldnt load up that heavy either.

As for the fronts, one tire or another will break from the ground a lot more often than the rears. Thus, the reason you go heavier than the rear. You want to give the tire enough time to come back into contact with the surface before the diff kicks in causing unforeseen restults. Anything from 3k to 7k IMO.

As for the rear.... Well, I havent seen anyone run higher than 1k in the rears YET. So it must be for a reason. I'm no pro so I can't say for certain. I would however be comfortable taking it up to 5k with no problem.

I'm no diff pro, but, the results I have seen always steer me to stick within those ranges. Yeah, some of it is because 'everyone else is doing it' and I tend to follow the locals at the track, but if ranges wayyyyyyy outside those amounts were more common I would also buy into it.

If you are running at a track at the bash, I suggest a 3,7,1 or 5,10,3 setup or anything inbetween.

Just my 2 centavios.

 

[militarymaxx]

Well, I cleaned out the diffs and put everything back the way I had it before with 5-7-1. This setup is better suited for my style of driving. With the 5-7-1 the rear end stayed right behind the front wherever I was on the track. I'm all about the front end. I like my power up front where I have more control with the steering and with the other setup of 70-100-50, the rear end had a mind of it's own. It didn't want to stay behind the front for crap. I'm not knocking the heavier weight setups, I think it's a drivers preference and what suits that person. Either way, I gave it a shot. Nothing ventured, nothing gained.

p.s. - EP, when it came to cleaning that 100K out of the diff, I can say without a doubt I had NO wood. What a mess !!