Differential Question

[GilBeQuick]

I searched the archive about diff oil weights. What I got from most of it is that 3k in the front 7k in the center and 1k in the rear is a good setup.
What I'm wondering if 3k-7k-1k is normal, then why would anyone be using 30k to 100k weight oils? Wouldn't those high oil weights defeat the purpose of a functional differential?
Also when you fill your diffs up, how much oil should you fill them with?

 

[RoadRunner]

I'll start backwards. The 3,7 n 1 is a starting point. although it will make such a difference as compared to a stock RTR that has only grease in the diff's. I ran mt Storm through break in before I re-built my diffs. The buggy was all over the place. Once i filled the diffs with oil, I could punch it and track pretty much straight. It was night and day. I have since then kept this set-up as I only bash and it works for me. As for the higher #'s of oil,I just dont know. I'm not a racer. My best guess would be that they run 10k and up in the center for quick hook up..

And when u fill ur diffs,.... fill them till the oil reaches the center of thr pins or a little less. Any more and you will blow a gasket. Hope this helped you.

 

[GilBeQuick]

That does help a little bit, thank you!
I'm still curious about the higher weight oils though....
So a higher oil weight in the center diff would give you better traction? If this is so, then how come 7k is the general reccomendation?

 

[RoadRunner]

The oil works like a Limited-Slip Diff in real time. If u want more traction, u need to increase the weight of oil in ur diffs.The reason racers have a higher # in the front is due to the fact that the front will pull. Kinda like a front wheel drive car in the snow. If the front wheels track, the rear wheels will follow.

 

[dgrobe2112]

the higher numbers, is basically a brand..

Mugen 100,000 is the same at Ofna 10,000

Mugen 30K is the same at Ofna 3k, mugen adds a extra zero to all their silicon oil numbers for some reason.. same with their shock oils.. Mugen 400 shock oil is the same as say Losi 40..

thats the higher number answer

 

[GilBeQuick]

I C. Thanks for the info dgrobe.

 

[FlyinRazorback]

Originally posted by dgrobe2112
the higher numbers, is basically a brand..

Mugen 100,000 is the same at Ofna 10,000

Mugen 30K is the same at Ofna 3k, mugen adds a extra zero to all their silicon oil numbers for some reason.. same with their shock oils.. Mugen 400 shock oil is the same as say Losi 40..

thats the higher number answer

dgrobe,
You couldn't be more wrong. Mugen oils are on the Centi Poise rating scale. It is the most accurate way to measure oils. Most American companies use a standard weight system. The numbers are not linear either. Here's what they look like

100 Cps = 10 WT
150 Cps = 15 WT
200 Cps = 20 WT
275 Cps = 25 WT
350 Cps = 30 WT
425 Cps = 35 WT
500 Cps = 40 WT

As for diff oils, Mugen 5,000 is equal to Ofna 5,000, GS 5000, etc. There are no differences when it comes to the diff fluids.

 

[dgrobe2112]

ok, so mugen oils are prolly more closer to their respective number then? here is what i am wondering.. why does someone running mugen oils have the same weights as me.. just an extra zero..

when i go to the hobby shop.. and get oils.. i ask for 3k diff oil.. and they give me 30k mugen.. i gave the oil back.. cuz i wasn't sure.. and the guy said.. its the same.. mugen has an extra zero.. so if i just put mugen 400 in my truck shocks.. what weight oil am i running??

If, and i mean if i am wrong.. i apologize, i am just giving answers to questions i had.. and got answers too..

Please explain Razor..

 

[FlyinRazorback]

I don't know why the guy at the hobby store told you that. He is misinformed and giving out wrong info. The Mugen diff oils are the same. For their shock oils the use a weighting system that is used in Asia and Europe. I don't know of any other way to say it. But, 350 is not equal to 35, or 400 is not equal to 40, etc. The list I posted above is shows what each one is equal to.