Chris Wilson Posted June 3, 2010 Share Posted June 3, 2010 I am now well into getting my RWD Skyline set up and after a shaky start at Anglesey the other week I sorted a few issues and took delivery of my OS Giken LSD assembly. It was running a Torsen LSD at Anglesey, and with the 2.5 engine last year, a Kaaz plat type LSD. The Torsen was, as expected, and as on track driven Supras, totally useless unless you want to make tyre smoke from the unladen wheel. The Kaaz one was rough and ready and always struck me as cheap and nasty, although it did work reliably. It was snatchy and not nice at all in the wet. The Giken has been a revelation, I would say it would save a couple of seconds a lap round a traction limited long circuit compared to the Kaaz. It was every bit as nicely made as the rest of Giken products, and works as well as high end race type plate LSD's, so if anyone is into track days or Time Attack with their MKIV this is the way to go. I can even get different ramp angle casings and different lockout springs to determine WHEN the diff starts to load up, as well as the normal plate variations to alter pre-load. They are just such an enthusiastic company. Quote Link to comment Share on other sites More sharing options...
Thorin Posted June 3, 2010 Share Posted June 3, 2010 Price? Just curious as to how many times more expensive it would be to the TRD diff Quote Link to comment Share on other sites More sharing options...
Wez Posted June 3, 2010 Share Posted June 3, 2010 Sounds good, how would it compare to a TRD LSD? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 3, 2010 Author Share Posted June 3, 2010 Will ask for a price on Supra MKIV LSD but my Skyline one was about a grand. Next to the proper gearbox it has to be the best buy I have made for it. http://www.osgiken.net/products/superlock.html http://www.osgiken.net/faqs.html Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 3, 2010 Author Share Posted June 3, 2010 Sounds good, how would it compare to a TRD LSD? Very different Wes, mine was a race version, with fairly aggressive settings, and it's really superb. I was told and told just how good they were by someone, but having already got an LSD I just left it. When I was forced to use an R34GTR casing to get the ratio I needed my LSD wouldn't fit, so I ran the stock Torsen initially (useless on track....) I decided to buy the Giken LSD for it. I am not easily impressed, but had to admit it was a great buy. Quote Link to comment Share on other sites More sharing options...
Wez Posted June 3, 2010 Share Posted June 3, 2010 I have a smaller diff casing from an NA auto which I am hoping to fit the higher/lower ratio ring/pinion in to reduce my top speed, do they do diff that would fit as my TRD is for the larger casing currently on the car. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 3, 2010 Author Share Posted June 3, 2010 I am awaiting full details of which casings they offer the LSD centre section for. Will post when I know, hopefully early next week. Quote Link to comment Share on other sites More sharing options...
Jellybean Posted June 3, 2010 Share Posted June 3, 2010 I have the Carbonetics Carbon LSD, interesting how it compares. Think Paul whiffin is running it in his Timeattack Supra Whats the oil change frequency on the OS Gilken Chris, Carbonectics recomment every 3K Km or after each track day Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 3, 2010 Author Share Posted June 3, 2010 Once bedded I'd change it every 6 track days. I use Neo 75W 90 RHD in all plate type LSD's and all race manual gearboxes. It's expensive but I am 100% sure it's the best and I get improved bearing and gear life even in transaxles that are running above their design torque or RPM limit. If you have a very expensive race gearbox, transaxle or diff I think the cost of the stuff is worth it, and I hear loads of people claim immediate wear improvements when they use it, but at £110 quid for 3.8 litres you don't splash it about like normal stuff. https://shop.fluidsinmotorsport.co.uk/product/neo_rhd_75w90_3_785l/ http://www.neosyntheticoil.com/gear_oil.html Quote Link to comment Share on other sites More sharing options...
Nic Posted June 3, 2010 Share Posted June 3, 2010 Sounds good, how would it compare to a TRD LSD? If my memory is not deserting me, I think the TRD LSD is made by OS Giken. Quote Link to comment Share on other sites More sharing options...
Nic Posted June 3, 2010 Share Posted June 3, 2010 I am awaiting full details of which casings they offer the LSD centre section for. Will post when I know, hopefully early next week. They do both sizes for the Supra, they are a fair bit more than the TRD ones though. http://www.osgiken.co.jp/pro_lsd/toyota.html Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 3, 2010 Author Share Posted June 3, 2010 It's not a Giken diff, probably a Cusco or Kaaz made unit to their specs? They are excellent value for money and a great improvement over the stock Torsen thing. It's only worth going for something more exotic if you are heavily into circuit usage. If you are building a serious drag car it should have a spool diff I would have thought, but tha\t would make it all but un-drivable on the road or track. Quote Link to comment Share on other sites More sharing options...
Paul Whiffin Posted June 3, 2010 Share Posted June 3, 2010 It's not a Giken diff, probably a Cusco or Kaaz made unit to their specs? They are excellent value for money and a great improvement over the stock Torsen thing. It's only worth going for something more exotic if you are heavily into circuit usage. If you are building a serious drag car it should have a spool diff I would have thought, but tha\t would make it all but un-drivable on the road or track. So your saying this would improve traction over a TRD diff? Thats what I currently run and I'm always looking at finding ways of improving traction as thats probably the worst part of a Supra on a race track. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 3, 2010 Author Share Posted June 3, 2010 I would say it's far more competition orientated than the TRD which is a civilised road car LSD. They can also be customised quite easily. Quote Link to comment Share on other sites More sharing options...
Paul Whiffin Posted June 4, 2010 Share Posted June 4, 2010 I would say it's far more competition orientated than the TRD which is a civilised road car LSD. They can also be customised quite easily. Hmmm, you've got me thinking now! Never really gave the diff much thought to be honest. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 5, 2010 Author Share Posted June 5, 2010 Well, on a race car it's a critical item, like dampers and tyres and geo. The two best mods to my Skyline, after sorting proper brakes, were the Tractive gearbox and the Giken LSD section for the final drive. So good is the Tractive that I have ordered another one to use in a new project. Quote Link to comment Share on other sites More sharing options...
Paul Whiffin Posted June 6, 2010 Share Posted June 6, 2010 Well, on a race car it's a critical item, like dampers and tyres and geo. The two best mods to my Skyline, after sorting proper brakes, were the Tractive gearbox and the Giken LSD section for the final drive. So good is the Tractive that I have ordered another one to use in a new project. Dont get me thinking about gearboxes again! Quote Link to comment Share on other sites More sharing options...
Wez Posted June 6, 2010 Share Posted June 6, 2010 Dont get me thinking about gearboxes again! A proper box has to be worth a few seconds a lap Quote Link to comment Share on other sites More sharing options...
Paul Whiffin Posted June 6, 2010 Share Posted June 6, 2010 A proper box has to be worth a few seconds a lap Doubt it mate, my car is so tractable now at Oulton Park I only changed gear twice on a lap, so 2 upshifts and 2 downshifts. Knockhill was 4 gear changes per lap so might save a bit of time perhaps. Could be interested in one of these diffs though! Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 6, 2010 Author Share Posted June 6, 2010 2 gear changes a lap at Oulton? You're kidding me? A quick run through in my mind gets about 15 a lap in my Skyline. Quote Link to comment Share on other sites More sharing options...
Paul Whiffin Posted June 6, 2010 Share Posted June 6, 2010 2 gear changes a lap at Oulton? You're kidding me? A quick run through in my mind gets about 15 a lap in my Skyline. Yep, 3rd gear at the hairpin and chicane, rest of the lap is 4th gear in my car. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 6, 2010 Author Share Posted June 6, 2010 Oh dear, the car could be so much quicker, even assuming it has a very wide power band. If you aren't getting near the rev limit in direct top (5th?) with other ratios spaced accordingly, you aren't making good use of the engine and transmission. Quote Link to comment Share on other sites More sharing options...
Paul Whiffin Posted June 6, 2010 Share Posted June 6, 2010 Oh dear, the car could be so much quicker, even assuming it has a very wide power band. If you aren't getting near the rev limit in direct top (5th?) with other ratios spaced accordingly, you aren't making good use of the engine and transmission. I could use lower gears in a couple of places but it wasn't really helping as it was getting to lairy. It was much quicker using the torque to pull it out of the bends, around 2 seconds a lap quicker by doing this. Quote Link to comment Share on other sites More sharing options...
bignum Posted June 6, 2010 Share Posted June 6, 2010 Anglesey sure is the place to test diffs and other stuff chris, i was spinning a wheel on the 2 tight hairpins last year even with slicks on. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted June 6, 2010 Author Share Posted June 6, 2010 That spells traction problems. Too stiff or inadequate LSD. Quote Link to comment Share on other sites More sharing options...
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