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ball diff over the normal diff - hpi rs4

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Old 09-07-2008, 03:13 AM
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Default ball diff over the normal diff - hpi rs4

i found out ball diffs fit the hpi rs4, are they better? would they fit perfecvtly. would they perform better


http://www.hpiracing.com/products/en/A958/

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Old 09-07-2008, 03:15 AM
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Default RE: ball diff over the normal diff - hpi rs4

oh yeah sorry, but would i need 2 sets for front and rear or can i just use 1
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Old 09-07-2008, 04:10 AM
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Default RE: ball diff over the normal diff - hpi rs4

You have a separate diff front and rear

From what I've found out, ball diffs don't last long and are fairly unreliable with the need of maintainance all the time

Considering you can get the same action + a lot more reliability from just packing the diffs with oil, I recommend doing just that (this is what I did)
Pack the diffs with the recommended weight oil for your car and forget ball diffs
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Old 09-07-2008, 04:35 AM
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Default RE: ball diff over the normal diff - hpi rs4

Ball diffs are not as good as the gear ones for an RS4. Especially fot the rear...even the softest setting of the ball differential is significantly harder than the one you use. So it will cause oversteer. Use front ball diff only if you tighten is as much as it gets in order to work with a blocked diff. The basic advantage of ball diffs is low weight but it's a waste of money.
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Old 09-07-2008, 05:29 AM
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Default RE: ball diff over the normal diff - hpi rs4

thanks spetz and gynaikas i thoguht it was good as pro 4 has them

so its either front one way or oil.
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Old 09-07-2008, 05:54 AM
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Default RE: ball diff over the normal diff - hpi rs4

Yeap! Oil or one way.Pro uses ball difs cause it's an old fashion BELT driven car.
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Old 09-07-2008, 09:03 AM
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Default RE: ball diff over the normal diff - hpi rs4

wouldn't a ball diff be better. smoother rotation cause of the ball bearing.
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Old 09-07-2008, 09:09 AM
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Default RE: ball diff over the normal diff - hpi rs4

It's lighter but not smoother...with that amount of money, asolid axel or one way system is more race-effective.
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Old 09-07-2008, 09:17 AM
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Default RE: ball diff over the normal diff - hpi rs4

gynakis would you sugest a sway bar kit or a front one way?


and what is a nitro rs4 handling kit?
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Old 09-07-2008, 03:22 PM
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Default RE: ball diff over the normal diff - hpi rs4

Difficult decision...I really don't know what to tell. If you're not gonna race at tracks then go for the sway bars. One way is pro stuff and needs skill.
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Old 09-07-2008, 03:38 PM
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Default RE: ball diff over the normal diff - hpi rs4

but i think ill get the hang of it as i drove rear brake rc car?

i was think i can adjust this buy using like 10k shock oil instead of the sway bars

fanks
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Old 09-07-2008, 09:15 PM
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Default RE: ball diff over the normal diff - hpi rs4

10k silicon oil????????????? OMG then your car will be like without suspenssion...don't ever do that! Sway bars are not for stifness. It's a dynamic system that transfers the load of one shock to the oposite in order to have less weight transfer during corners. In that way your camber angles will work better. In simple words you corner without weight transfer and tires have the same traction but with less camber during cornering.
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Old 09-08-2008, 03:26 AM
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Default RE: ball diff over the normal diff - hpi rs4

I think he meant 10K silicone diff oil not shock oil
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Old 09-08-2008, 09:53 AM
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Default RE: ball diff over the normal diff - hpi rs4

sorry my mistake 100 in shocks
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Old 09-08-2008, 11:25 AM
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Default RE: ball diff over the normal diff - hpi rs4

100 is pretty heavy unless you have superstiff suspension
I run 60 front and 50 rear and the shocks are already pretty tight at that setting (with 1 hole piston)
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Old 09-08-2008, 11:37 AM
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Default RE: ball diff over the normal diff - hpi rs4

i have green springs front black rear

and how many holes are in the hpi rs4 piston?

thanks
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Old 01-08-2018, 07:36 PM
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Default

WOW an internet search lead me to a post that is older than dirt and yet when one posts in it they get flamed. well guess what if a search is going to lead me to the topic im going to post in it dammit cause i dont give a rats @$$ about last post date :P. now with that said i do see alot of good info in this topic save for 1 and that is fluid filling the diffs, the gear diffs on the RS4 series first gen on were NOT sealed meaning you pu oil in them and it will all leak out and as far as i can tell there was never a "sealed" diff made for the early RS4 cars and come to think of it never saw one for a later model car either.

now with that having been said what led me to this topic was an internet search regarding the size of the ball diff in relation to using the 39T ball diff ( as found on an RS4 Nitro Mini, or a 32T such as found on the RS4 Mini and mini Pro electrics, suffice to say i didnt get anywhere near the information i was searching for.
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