Truenotch Posted September 27, 2009 Share Posted September 27, 2009 Interesting stuff from kpr's build thread, I've got a few queries now since everyone seems keen to try it. The idea is simple enough - slice and weld, or just head a spot and let it tweak when cooling. My main query is whether this would mess up the geometry if done to a car with 4link etc. Since KPR hasn't welded his shock mounts or links on yet he has a blank canvas for correct angles... but if you did this with an existing 4 link it would leave them twisted all the time (not by much, but 4 links are known for binding when angles are wrong). Do you think it would work sweet or not? Discuss. In my case I've got a good parallel, even length 4 link setup and a floating axle solid diff (which will allow for more 'natural play" due to having a spline on each end). I'd like to try to get some camber, but don't want to risk ruining the geometry. Quote Link to comment Share on other sites More sharing options...
peteretep Posted September 27, 2009 Share Posted September 27, 2009 is there any advantage of having camber in the rear? Quote Link to comment Share on other sites More sharing options...
fuel Posted September 27, 2009 Share Posted September 27, 2009 it's good for cornering and track work, not so much for drag racing (although less than 1.5deg shouldn't be an issue). Fail Is that what you said when you looked at your car? Quote Link to comment Share on other sites More sharing options...
Crownin_Round Posted September 27, 2009 Share Posted September 27, 2009 Wow thats a good one...... So solid axle works on the premice of everything being straight, "bending" the diff would foul this, theres no way the axle would turn if it was grinning... Quote Link to comment Share on other sites More sharing options...
fuel Posted September 27, 2009 Share Posted September 27, 2009 well you thought wrong - there's a small amount in play of the splines, and infact Truenotch said he had floating axles therefore it's splined on both ends. Sure it will probably wear out the splines at a faster rate but you can get away with at least 1deg of camber with the amount of play in a spline. Quote Link to comment Share on other sites More sharing options...
My name is Russell Posted September 27, 2009 Share Posted September 27, 2009 Isn't it a common thing for race cars to do add 1.5deg camber? depending on what tolerances you can get from the diff head. Im sure timmy has 1.5 on his anglia? Quote Link to comment Share on other sites More sharing options...
Crownin_Round Posted September 27, 2009 Share Posted September 27, 2009 So you would have to machine the diff housing for a matter of milimetres? Quote Link to comment Share on other sites More sharing options...
fuel Posted September 27, 2009 Share Posted September 27, 2009 So you would have to machine the diff housing for a matter of milimetres? dude if you don't know anything don't bother sharing your opinions. Quote Link to comment Share on other sites More sharing options...
Spencer Posted September 27, 2009 Share Posted September 27, 2009 yes super taxis and other race classes that are locked to a live axle run camber in the rear, its a perfectly reasonable mod. In a track car abit of extra wear is perfectly acceptable for the gains Quote Link to comment Share on other sites More sharing options...
Spencer Posted September 27, 2009 Share Posted September 27, 2009 the super taxis run a eccentric bearing setup to get their adjustment, cant seem to find a picture Quote Link to comment Share on other sites More sharing options...
SloNLo Posted September 27, 2009 Share Posted September 27, 2009 can also do the same thing with a big press. have to bend it a fair bit to make it stay bent though. Quote Link to comment Share on other sites More sharing options...
Testament Posted September 27, 2009 Share Posted September 27, 2009 the super taxis run a eccentric bearing setup to get their adjustment, cant seem to find a picture you mean the aussie ones? or NZV8's? I'm pretty sure the NZV8's just put the whole rear axle in a press and bend it. I dont think the distance the link attachments move will be that significant really, I guess if your running stiff bushes it possible though. if you have spherical bearings it would be ok, the arm might just be doing an arc thats just a whisker off being vertical with the position change. calculate out the position change mabye? if you know the distance of the pickup points on the diff and the amount of camber required you can work out the position change by trigonometry. Quote Link to comment Share on other sites More sharing options...
Unclejake Posted September 27, 2009 Share Posted September 27, 2009 Heat shrinking the diff housing is the normal and fastest way to infroduce negative camber into a live rear axle. 1 - 1.5 degrees is all you will get out of it and there is an obvious stress load, increased wear and reduced power to the road wheel as a result. Truenotch - I doubt it will mess up your geometry at all. Heat shrink, don't cut. Heat shrinking is reversible too. First you need to lock down the housing and measure the shit out of it before getting it hot. Spend $80 on a digital protractor from TradeMe Quote Link to comment Share on other sites More sharing options...
drftnmaz Posted September 27, 2009 Share Posted September 27, 2009 i was going to do this a while ago, the yanks do it, but they run floating axels to make up for it apartently anything less than 1.5 degrees is useless, so i worked out how much i needed to bend it to get 1.5degrees then worked out length of axel to see how much it need to deflect on the head end and it was heaps! like i would imange a axel lasting you a couple of events if your lucky i wouldn't mind a degree for some more guard clearance, but its not worth it IMO Quote Link to comment Share on other sites More sharing options...
Spencer Posted September 28, 2009 Share Posted September 28, 2009 the super taxis run a eccentric bearing setup to get their adjustment, cant seem to find a picture you mean the aussie ones? or NZV8's? I'm pretty sure the NZV8's just put the whole rear axle in a press and bend it. OZ v8's dude, they definitely run eccentric bearings with adjustment not bent housings. Just was trying to find a picture for reference Quote Link to comment Share on other sites More sharing options...
Steelies Posted September 28, 2009 Share Posted September 28, 2009 someone needs to just do this on a shitter diff, thrash it and see what happens, andlet the rest of us know! anyone got a spare kp diff? Quote Link to comment Share on other sites More sharing options...
Crownin_Round Posted September 28, 2009 Share Posted September 28, 2009 Hmm I have a spare F series housing.... Quote Link to comment Share on other sites More sharing options...
BobbyBreeze Posted September 28, 2009 Share Posted September 28, 2009 How much free play are in the axles? on a 1400mm wide diff you need to lift the wheel 25ish mm higher to gain 2degrees camber. Quote Link to comment Share on other sites More sharing options...
mark105 Posted September 28, 2009 Share Posted September 28, 2009 will check with the old man, pretty sure he's been running 1 deg on the rear of the avenger for 3 full targas now with no problems. Quote Link to comment Share on other sites More sharing options...
kpr Posted September 28, 2009 Share Posted September 28, 2009 someone needs to just do this on a shitter diff, thrash it and see what happens, andlet the rest of us know!anyone got a spare kp diff? give me a few months. will post up here if mine breaks. mate who gave me the idea to do it sent me this: drinkrow ae86 apparently they are running 3 degrees and a little toe in, no issues after seasons racing. axles have to be hammered in and out Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.