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crf87
New Member
United Kingdom
9 Posts |
 Posted - 17 August 2011 : 09:11:03
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| hi to everyone, im new to the rc scene, ive been a couple of times to watch and it looks fun. ive just bought a hyper 7 and been reading that everybody changes the diff oils, but i really dont know which weight (i think) to put in them. any help would be great. |
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ryan b
New Member
United Kingdom
47 Posts |
Posted - 17 August 2011 : 10:16:13
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| A good starting point is 7k in the front,7k in the middle and 3k in the rear. |
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TomTom
Average Member
Kyrgyzstan
596 Posts |
Posted - 17 August 2011 : 19:07:52
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| If its a new hyper, do the diff oils sooner rather than later as they only come with a bit of grease in them! |
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davecorah
Junior Member
United Kingdom
342 Posts |
Posted - 17 August 2011 : 20:14:10
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| And dont overfill the diff, only just over the crossover between the planetary gears, if in doubt ask someone either at the club or in the shop |
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crf87
New Member
United Kingdom
9 Posts |
Posted - 17 August 2011 : 21:00:56
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| thanks for the advice guys, i was gonna ask how much to put in them. what would the differece be from 7k front 7k middle 3k rear to 7k front 5k middle 1k rear. also its a second hand one. also there doesnt seem to be much resistance when you spin one rear wheel while holding the other rear wheel, does this mean the diff is about shot? |
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ryan b
New Member
United Kingdom
47 Posts |
Posted - 17 August 2011 : 21:21:13
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| Thinner the oil the other wheel will spin easier.1k oil is way to thin in a buggy because one will wheel will spin up in stead of both of them. so thicker oil will make the diff harder to turn causing more drive to BOTH wheels.The more drive at the wheels you want the thicker the oil should be.so 3k in the rear is prob be best.7k in the front is good to but depending on what driving style you have 7k-10k centre diff oil is generaly used. |
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TomTom
Average Member
Kyrgyzstan
596 Posts |
Posted - 18 August 2011 : 19:31:46
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| Differentials send power down the easiest route, so the wheel with the least grip will spin up, hence why 4x4's e.t.c have diff locks to stop this from happening. The thicker the oil you use in the diff, more power is sent to the wheel with grip. A locked diff will send equal amounts of power to each wheel no matter how much grip each one has. |
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David Smeaton
New Member
United Kingdom
81 Posts |
Posted - 25 August 2011 : 19:01:06
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It is important to remember that thicker oil in the front will encourage under steer, thinner in the front encourages grip over steer.
Thicker oil in the rear encourages over steer by sliding the rear end, thinner gives more grip. The rear will generally not spin up the inside wheel if the suspension setting is correct.
Thinner oil in the centre will encourage wheel spin in the front wheels and a certain amount of over steer. Thicker oil will give more 'permanent' 4WD and could promote under steer.
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crf87
New Member
United Kingdom
9 Posts |
Posted - 25 August 2011 : 20:42:28
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| thanks for the info guys, ive gone for 5 in front, 7 in the middle and 3 in the rear, havnt had time to try it yet but at least ive got a starting point. |
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David Smeaton
New Member
United Kingdom
81 Posts |
Posted - 26 August 2011 : 19:50:19
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| 7 in the middle is a bit light i think. I would start at around 15-20,000wt as it will amke the car more docile. |
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davecorah
Junior Member
United Kingdom
342 Posts |
Posted - 26 August 2011 : 20:59:18
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anddont forget diffs are not "fit and forget" check oil levels after every 2-3 meetings and top up as needed, an empty diff will cause handling problems which as a beginnner is not good as you need to learn to drive the car not fight the car due to a bad setup,
5,7,3 seems to be what most hyper 7's were running, see how it drives and wether you want it to handle differently then change one diff at a time to see wether it is better or worse for you,
there are plenty of hyper drivers and ex hyper drivers at the club so plenty of on site info available whenever you need it |
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