eric Posted March 17, 2010 Share Posted March 17, 2010 What would the advantage for road and track use ? more or less understear if only advantages, why Caterham doest not fit the road going cars ? Link to comment Share on other sites More sharing options...
jingars Posted March 17, 2010 Share Posted March 17, 2010 Quite a discussion on the subject last September which I found enlightening. As a casual road user I am sticking with an open diff - but being a big kid I would also love to be able to do donuts....... Link to comment Share on other sites More sharing options...
Eugene Posted March 17, 2010 Share Posted March 17, 2010 Put an LSD in my Ital live axle some time back - first time I overtook at power the difference was amazing - shot past the other car like never before... Never realized the loss of power due to one wheel lifting while taking on such maneuvers. Best addition I've made to the 7 😬 Small Boy - with Loud Toy! Co-founder of the BOG Club See Eugene here and see what I do here Link to comment Share on other sites More sharing options...
James-Seven Posted March 17, 2010 Share Posted March 17, 2010 Eugene Which LSD did you use, how much and where from. Link to comment Share on other sites More sharing options...
Iain A Posted March 18, 2010 Share Posted March 18, 2010 I added an LSD to mine years ago. One of the best upgrades I have done both for road and track. I see no disadvantages apart from being lighter in the pocket. Mine is a Quafe ATB so perhaps not as extreme as some (plate types), but it works brilliantly. No regrets. Do it! One of the Duratectives Link to comment Share on other sites More sharing options...
bstark Posted March 18, 2010 Share Posted March 18, 2010 Likewise - Quaife ATB in an Ital axle. Makes a massive difference to controllability at the limit on the track. Greater traction and more choices re: exit angle on the road. No understeer issues with the ATB. quite the opposite in fact as you can now control oversteer on power rather than flinging it in and relying on roll oversteer which can bite beyond a certain point - all on track of course. Some people on here seem to have a downer on the ATB for some reason but it has performed brilliantly for me and is completely silent to boot. Bob Stark Supersprinter Link to comment Share on other sites More sharing options...
Irrelevant Posted March 18, 2010 Share Posted March 18, 2010 Some people on here seem to have a downer on the ATB for some reason but it has performed brilliantly for me and is completely silent to boot It's not that people have a downer on it . . . it's just that there are a lot of really anal people on here to whom the fact that an Automatic Torque Biasing differential is not a Limited Slip Differential is a big issue . . . that's all Link to comment Share on other sites More sharing options...
bstark Posted March 18, 2010 Share Posted March 18, 2010 Aaaaah - so that's what it is 😶🌫️ Bob Stark Supersprinter Link to comment Share on other sites More sharing options...
Steve T Posted March 18, 2010 Share Posted March 18, 2010 So whats the 'donutability' like with an ATB ? Steve Now with DVA Power! 191bhp and 150.9 lbft torque. My Pictures Link to comment Share on other sites More sharing options...
Iain A Posted March 19, 2010 Share Posted March 19, 2010 So whats the 'donutability' like with an ATB ? No problems at all 😬 One of the Duratectives Link to comment Share on other sites More sharing options...
Gordon C Posted March 19, 2010 Share Posted March 19, 2010 Not long put a Quaife ATB in mine. Although i have only driven the car a few times it seems to be so much better than the previous open diff. Theres some nasty bumps over the top of a local common where the car would skip about scrabbling for grip. Putting the Quaife in and it seems now that the car drives straight on through if that makes sense. So much smoother. I'm guessing that the ATB is working overtime compensating for all thoughs bumps and troughs where as the open diff the wheels would be spinning every which way. Looking forward to the Dunsfold handling day 😬 _________________________ Gordon. Morgan LeMans62 Link to comment Share on other sites More sharing options...
jakeandlizzy Posted March 19, 2010 Share Posted March 19, 2010 One word: donuts 😬 Link to comment Share on other sites More sharing options...
eric Posted March 19, 2010 Author Share Posted March 19, 2010 If I undestand well, we can put in a std diff a LSD I think we were obliged to change the open diff for an LSD I read that there are some differents diff we can put in caterham is one, AP suretrac and Quaife are others At the limit, a LSD cancels the action of the diff and the oversteer happens but with a possible throttle control At high speed without a LSD, all the power goes off through the spinning inside wheel and a low speed there is no difference between with and without. So there is more traction with. Normally on the road, at average speed the 7 is more agile without LSD In wet condition : without is more secure, with will need some more driving experience but with it the car will be more efficient. Do I make mistakes ? Link to comment Share on other sites More sharing options...
bstark Posted March 20, 2010 Share Posted March 20, 2010 Eric - sort of - and depends 😬 I wouldn't think about speed so much as the relative traction available / amount of power you are trying to apply. With an ATB fitted I found no reduction in agility compared to an open diff. An ATB continuously varies the amount of torque applied to each wheel, whereas a 'normal' LSD is effectively open until the difference in spin between each wheel reaches a certain point, then it 'locks' the diff. My experience is that you need to be a little more careful in the wet when applying the power as you more likely to end up sideways with an LSD. Hope this helps! Bob Stark Supersprinter Link to comment Share on other sites More sharing options...
Rob Walker Posted March 20, 2010 Share Posted March 20, 2010 Bob Stark I have found exactly the opposite. In the wet I find that I have a lot more grip in that the LSdiff locks and keeps the power delivery to both driven wheels. As oversteer increases its then easier to keep control of the car by steering into the slide and the carefull control of the throttle. In the dry its much the same but at higher speeds. Rob Link to comment Share on other sites More sharing options...
Steve T Posted March 20, 2010 Share Posted March 20, 2010 Rob I assume that an ATB is less prone to loss of control in the wet on the road than a full LSD (Titan) etc due to it's more gradual power delivery ? I have been going to put an LSD in mine for ages but keep changing my mind which one to fit (ATB/Titan), mainly road use, cost is not the issue but for me i see more advantages with the ATB ie quieter in use, less on/off characteristics, smoother power delivery for wet road situations (and an ability to do donuts - although I understand not quite as well as a Titan !) I understand the Titan is noisier in normal operation (ie road, roundabouts etc) but better suited to track (kerb hopping etc) use. Feel free to contradict if my assesment is incorrect ! Steve Now with DVA Power! 191bhp and 150.9 lbft torque. My Pictures Link to comment Share on other sites More sharing options...
Rob Walker Posted March 20, 2010 Share Posted March 20, 2010 Steve The ATB is not a true LSD and requires some torque appied to both wheels to function. I have had a ZF diff fitted to my car for years and do not find that it is any more of a problem to live with than an open diff. The main problem that I have is noise from the diff when it gets hot and this is due to the serria diff casing being made from aluminium and the crown wheel and pinion made out of steel( a different coefficient of expansion). When the whole lot gets hot the diff casing expands and the mesh between the gears changes also the oil gets thinner and the noise increases. Now this applies to any diff in the caterham install be it an LSD or open diff. BTW I understand the Titan LSD is a plate diff and operates the same as the ZF, CC now install the Titan as the ZF is no longer available. I would fit the Titan Diff or TranX If I were shopping. Rob Edited by - Rob Walker on 20 Mar 2010 15:26:43 Link to comment Share on other sites More sharing options...
Eugene Posted March 20, 2010 Share Posted March 20, 2010 gts1, not sure to be honest - fitted and supplied by Chris at The 7 Workshop... really do recommend talking to him 😬 Small Boy - with Loud Toy! Co-founder of the BOG Club See Eugene here and see what I do here Link to comment Share on other sites More sharing options...
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