richglanzav Posted October 10, 2011 Share Posted October 10, 2011 just thought it would be good for the 4 paw owners (myself especially as i really don't understand it) if some of the more 'in the know' members could explain exactly what transmission wind up is - why it occurs and how its avoided.for example, why is it if you have a differential front and rear, can you not have a solid shaft through the middle. is there any cars that dont have couplings in the middle?also, if you have a turbo'd 4wd starlet with decent power doing a full launch its conceivable its gna break traction so talk me through exactly what happens with the viscous coupling during these moments. Quote Link to post Share on other sites
shorty Posted October 10, 2011 Share Posted October 10, 2011 I would also like to know more tbh. Why cant i change the viscuse coupling to a solid shaft? What would be needed to do it? Or could it not be done atal? As an awd 4paw would be awesome! Quote Link to post Share on other sites
morgey Posted October 10, 2011 Share Posted October 10, 2011 Not sure if this is the same or not but my mate has a subaru justy awd with a swift gti turbo engine in it (currently running 214whp) and his used to run a viscous coupling just before the rear diff, he put a solid shaft in instead but had to weld the rear diff as it would have shat itself if he didnt. Oh he also got his prop mounts poly filled at the same time. Needless to say he got his standing 1/4 mile down by 0.5secs from 12.9 to 12.4 making it the fastest justy in the country lol Quote Link to post Share on other sites
richglanzav Posted October 11, 2011 Author Share Posted October 11, 2011 nice mate thats impressive, so the vicous coupling is mainly there to take stress off the rest of the components then? i just cant see how the back end of the propshaft is ever gna be spinning faster than the front end at the transfer box. so i dont see why its so risky to just have a solid shaft prop Quote Link to post Share on other sites
morgey Posted October 11, 2011 Share Posted October 11, 2011 In the case of his car it was to reduce drag aswel, at it was originally only 75hp, meaning it was biased as a fwd car but when the fronts lost traction then the rears came in, but the way it worked only put a limited amount of power through (70-30 or something) which is why the rear diff never destroyed itself prior to the solid prop.So if thats how the starlets work, I couldnt see why it couldnt be done? Oh and now his car has a welded rear diff yes it is now a pain in the arse to turn tight corners!Edit... just re-thought this and its prob the same setup as a starlet so diff wind up was prob some of the reason the rear diff needed welding? Quote Link to post Share on other sites
Lukew360 Posted October 13, 2011 Share Posted October 13, 2011 Thanks for the video, It's the best explanation I've ever seen! Quote Link to post Share on other sites
Bean Posted October 13, 2011 Share Posted October 13, 2011 just watched it, great video! Quote Link to post Share on other sites
shorty Posted October 16, 2011 Share Posted October 16, 2011 Bloody imenses explinastion thank you. So how would we make an awd system or is that just not posable? Or is it just fitting lsd's and thats as far as our drive train upgrading can go? Quote Link to post Share on other sites
dac69er Posted October 28, 2011 Share Posted October 28, 2011 my ep85 viscous coupling was knackered when i got it. it went the opposite way to the way weejohn explained. some of the fluid leaked out so it needed more force to turn it. resulting in the split to the rear being even lower than as standard.with the coupling replaced it made a noticeable difference to the power sent to the rear wheels Quote Link to post Share on other sites
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