TimS Posted January 26, 2015 Share Posted January 26, 2015 Hi all, I recently took out my diff and replaced the oil with 10,000 weight diff oil. To be honest, I can't remember what oil was in there before, but I mostly run on flat (ish) grass and tarmac - so light bashing really. My issue is that since changing the oil, the Baja appears harder to control and also, when it's up on its stand and I turn the rear wheels, they turn freely in the same direction, whereas previously, they turned in the opposite direction to each other and there was some 'resistance'. Has something gone in the diff and is it connected to the control issue? Any help would be appreciated. Thanks, Tim Quote Link to comment Share on other sites More sharing options...
jea Posted January 26, 2015 Share Posted January 26, 2015 I my be wrong but I think thy have 1,000 silicone diff oil as stock ? so 10,000 will be a bit thick. so its a bit like a locker diff Quote Link to comment Share on other sites More sharing options...
(-:AD:-) Posted January 26, 2015 Share Posted January 26, 2015 1k is too thin. Esp if running anything other than the standard engine. Ive got 7k in mine and like it. 10k will be the next I use. Lots of people run 10k. A fellow basher has 30k I think. Thats on tarmac mainly. Sounds like all is ok. If its too much try 5k and go from their 1 Quote Link to comment Share on other sites More sharing options...
TimS Posted January 26, 2015 Author Share Posted January 26, 2015 Thanks for your replies - assuming the 10k oil is OK (I'll give 7k a go next time round), is it normal for both wheels to spin the same way around and freely? Previously, when on the stand, if I spun a wheel one way, the other wheel would spin in the opposite direction. There was also some resistance. My understanding was that this 'test' confirmed that the diff was working properly. Quote Link to comment Share on other sites More sharing options...
marder Posted January 27, 2015 Share Posted January 27, 2015 (edited) Thanks for your replies - assuming the 10k oil is OK (I'll give 7k a go next time round), is it normal for both wheels to spin the same way around and freely? Previously, when on the stand, if I spun a wheel one way, the other wheel would spin in the opposite direction. There was also some resistance. My understanding was that this 'test' confirmed that the diff was working properly. With finger put brakes on by pushing P shape thing with finger, which stop gears turning And while doing that turn one wheel while on its stand, other wheel should turn other way Or hold spur if cover is off With thick oil it makes cogs easier to turn than the spider gear in the diff, but by applying the brake it stops that Edited January 27, 2015 by marder 1 Quote Link to comment Share on other sites More sharing options...
Popular Post Carpmart Posted January 27, 2015 Popular Post Share Posted January 27, 2015 Open diffs deliver power to the path of least resistance. Thin oil means that the diff is a standard open diff. If you use thicker oil, the resistance the oil provides, basically stops it working so well as a differential. The thicker the oil, the more it 'locks' the diff up and the less different rotational speed is possible across the axle. There is an optimum point from a physics perspective and from a driving style perspective. Your comments are suggesting that you have exceeded the point that suits your driving style, so I would suggest you go thinner next rebuild. 4 Quote Link to comment Share on other sites More sharing options...
TimS Posted January 27, 2015 Author Share Posted January 27, 2015 Thank you for your very helpful answers guys - much appreciated! Quote Link to comment Share on other sites More sharing options...
Bigjimknickers Posted February 10, 2015 Share Posted February 10, 2015 What's the general recommended grade oil? For bashing off road grassy, sandy areas? 1 Quote Link to comment Share on other sites More sharing options...
flatout! Posted February 11, 2015 Share Posted February 11, 2015 (edited) I think a good weight is 5/6000 was recommended the other day on another thred for normal to bashing type of thing, 10,000 is very heavy but iv read of bashers useing 30,000 I think and thats thick oil, basically the thicker the oil the wider the turn circle , the thinner the oil the tighter the turning circle. Hope this helps, but look in to these things first or wait for me to be corrected before you go ahead Edited February 11, 2015 by flatout! 1 Quote Link to comment Share on other sites More sharing options...
Thunderwolf Posted February 11, 2015 Share Posted February 11, 2015 (edited) basically the thicker the oil the wider the turn circle , the thinner the oil the tighter the turning circle. this is true to a point, thicker or thinner oil has and effect off and on power off power a thinner oil will make for a tighter turn, but once you put the power down it can also result in lost speed or slow acceleration until you have finished turning thicker oil will indeed make a wider turn off power, it will allow you to put the power down harder as well but at the down side of being easier to over steer or spin out completely. more power also has an effect, with more torque thicker oils loose the above property of sliding as they have an easier time moving that thick oil, this is why some people go as high as 30k. most people go for the higher thickness oil to get the sideways action the baja is known for....really actually its known for doing donuts all the time but that because people can't drive. car set up is down to the user's preference of handling, for bashing that set up is usually to what ever in most fun, for racing its what ever lets you go around the track faster, no one choice is the right one, there is only the choice for you. Edited February 11, 2015 by Thunderwolf 2 Quote Link to comment Share on other sites More sharing options...
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