Deleted User Posted October 21, 2012 Share Posted October 21, 2012 99176 wrote:Both of Marcus' pics are MkI and MkII 'work in progress' by my son.I am approaching this from a slightly different angle.All geometry will be as original, but I am aware of the problems associated with offset springing.BTW I do like AVO,s but admit to fitting spherical bearings every time. I though it was Keith but I was wondering how Marcus got hold of the pic! I have emailed Karl but had not had a reply from him regards any progress on the sale of the kit?Rob Quote Link to comment Share on other sites More sharing options...
Spider Posted October 21, 2012 Share Posted October 21, 2012 Top link needs to be shorter than the bottom wishbone, otherwise the camber goes more positive in compression which is the opposite of what you want, in my opinion. Quote Link to comment Share on other sites More sharing options...
99176 Posted October 21, 2012 Author Share Posted October 21, 2012 Hi Rob, Not easy to contact, I agree, otherwise I wouln't need to ask advice on here.Kids eh? Quote Link to comment Share on other sites More sharing options...
GT6 M Posted October 21, 2012 Share Posted October 21, 2012 I cant be sure, but I think Karl changed the early version, after I had a chat with him.2nd much better now, said he was wanting to keep it standard as much as possible, so the same mounts can still be used on a GTSo going by what he said it seems lodgical too keep lower links and location spots for em.Mr Arachnid, not if the roto spring is used, as it is the one reason that with longer lower links, the camber change is 0as the spring actually bends inwards,so taking top link with it.with oot the spring , you will have about 1 deg neg on bump,and 1.5 deg positive on droopgoing by my mock up i made.come on Keith, bung some pics up Pleeeeeese,so us folk with a tinkerous disposition :)Myself, Im giving the BMW diff set up some serious thought again.the idea of 32 mph x 1000 rpms in OD top is a bigg allureM Quote Link to comment Share on other sites More sharing options...
Spider Posted October 21, 2012 Share Posted October 21, 2012 Quote:Mr Arachnid, not if the roto spring is used, as it is the one reason that with longer lower links, the camber change is 0as the spring actually bends inwards,so taking top link with it.with oot the spring , you will have about 1 deg neg on bump,and 1.5 deg positive on droopgoing by my mock up i made.I would be interested to see your mock up, with out the spring, Marcus or some details of it, I can only think that the top and bottom links/wishbones are not parallel to start with as a longer link has a lower movement of arc than a short one. Quote Link to comment Share on other sites More sharing options...
GT6 M Posted October 21, 2012 Share Posted October 21, 2012 Just for you m Boy, here ye areI used a bit of wood the same length as half the spring, and moved the bottom bit in / oot /up / doon, untill I got some where where I wantedI could not get it perfect with this, but the spring took care of the odd degree out on the car, as stated before.its maybe a crude way of dooing it, but I like shed tune fiddlin ways. :) :)NOTE, the full bump,and Droop settings on this mock up, are at least 2-3 inches moer travel than what can be got on the car, due to chassis and shocker restrictions.So these figs, would have been less,if done to actual movement ont car, follow,!!!Also these wernt final figs got, but no far off. it ran to quite a few pages of trial an error.but easy whenst on a bench set up.and this was an early set up, as I ended up wid the lower link nearly 14 inches langas opposed to 11 3/4 on here.M Quote Link to comment Share on other sites More sharing options...
James Posted October 21, 2012 Share Posted October 21, 2012 But— we want camber change— yes? Quote Link to comment Share on other sites More sharing options...
GT6 M Posted October 21, 2012 Share Posted October 21, 2012 jcarruthers wrote:But— we want camber change— yes???????, pray tell why Sir James. Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted October 21, 2012 Share Posted October 21, 2012 Generally a (smallish) increase in negative camber as the suspension compresses is considered an advantage - because it tends the keep the most tyre tread on the road when cornering.NickLike the test rig :) Quote Link to comment Share on other sites More sharing options...
Spider Posted October 21, 2012 Share Posted October 21, 2012 Many thanks for the details Marcus that makes a lot of sense to me now, I will do a mock up like yours when I come to do my mods. I will be doing your mod of longer/lower links with transverse spring first then experimenting with my old chassis to convert to Ford diff/halfshafts and double wishbones. Quote Link to comment Share on other sites More sharing options...
James Posted October 21, 2012 Share Posted October 21, 2012 Nick_Jones wrote:Generally a (smallish) increase in negative camber as the suspension compresses is considered an advantage - because it tends the keep the most tyre tread on the road when cornering.NickLike the test rig :)That's what I thought :) Quote Link to comment Share on other sites More sharing options...
Clive Posted October 21, 2012 Share Posted October 21, 2012 I also suspect a small change to positive camber on droop is useful too, as it sets the inboard tyre up correctly in a corner (if you ski it makes even more sense).Obviously the situation where the old swing axle cars jack up is rather less than helpful, but a small change to neg on compression and pos on droop may well be ideal. This is all gut feeling, and difficult to explain :o Quote Link to comment Share on other sites More sharing options...
piman Posted October 21, 2012 Share Posted October 21, 2012 Hello Nick, not always that simple, the amount of negative as the wheel compresses is affected by the roll of the chassis which will reduce it, it all depends how much roll there is but needs to be taken into account?Alec Quote Link to comment Share on other sites More sharing options...
GT6 M Posted October 21, 2012 Share Posted October 21, 2012 already catered for, :)car on a lean, jacked up that much, front wheel of the ground.rear veiwdrivers side camber, with car tiltedpassenger side,it is quite effective.M Quote Link to comment Share on other sites More sharing options...
Deleted User Posted October 21, 2012 Share Posted October 21, 2012 99176 wrote:Hi Rob, Not easy to contact, I agree, otherwise I wouln't need to ask advice on here.Kids eh?Yes mate I understand, It seems a shame he doesn't reply to business emails as well as his dad, someone may develop the set up before him and get the sale!I need some CV jointed drive shafts with the conversion!How you doing?Rob Quote Link to comment Share on other sites More sharing options...
99176 Posted October 23, 2012 Author Share Posted October 23, 2012 Thanks to our IT department there should be two images here. Quote Link to comment Share on other sites More sharing options...
James Posted October 23, 2012 Share Posted October 23, 2012 Ohhh I want a pair of those wishbones!!Who made them Keith? And would they make another pair? Quote Link to comment Share on other sites More sharing options...
Clive Posted October 23, 2012 Share Posted October 23, 2012 Or maybe a batch :) Quote Link to comment Share on other sites More sharing options...
SkUG Posted March 13, 2013 Share Posted March 13, 2013 I'm just starting to think about getting around to starting to put my suspension back together (the bare chassis is looking lonely on its side in the garage... why do I have so many projects on the go!?).This concept looks good, easy to fit, and looks like it'll work better than the original setup, I am a little concerned about torque twist though...Keep up the good work SkUG Quote Link to comment Share on other sites More sharing options...
JohnD Posted March 13, 2013 Share Posted March 13, 2013 Marcus,Your heroic experiment is after my own heart, and I'd encourage others to do the same - it really gives you a feel for your suspension. But I'd also encourage them to do it in the way I did in the Courier, years ago, by making full sized but 2D card models of the upright, spring and wishbone. With a big drawing board, it makes experiments a lot easier!John Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted March 13, 2013 Share Posted March 13, 2013 SkUG wrote:I'm just starting to think about getting around to starting to put my suspension back together (the bare chassis is looking lonely on its side in the garage... why do I have so many projects on the go!?).This concept looks good, easy to fit, and looks like it'll work better than the original setup, I am a little concerned about torque twist though...Keep up the good work SkUGTorque twist not an issue in power-on situtations as torque reaction is passed back to the diff but might be under braking.Nick Quote Link to comment Share on other sites More sharing options...
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