Brisbane contacts for CNC machining..?

[Rollin]

PHULL - not even close. Probably the best approximation I could give you would be similar to a VT commodore lower arm but with more holes...

These are the factory e-series arms (fucking poly bushes are shit, never use them):



The ones I have made are a hybrid of e-series and AU, to allow fitment of AU uprights and brakes (for eg: BF Brembos....)

Gammaboy - yes, I am aware it will cost metric fuckloads, but I want AU offset and brakes that don't vaporise the first time you stand on them, so it's either this or a half ass brake upgrade for almost 2 grand from some cunts down south which doesn't even fit properly.

[da9jeff]

saloon ea's seem to get around mallala with brakes intact - what do they use?

cop>> that 3dproto place seems interesting, so they could take a solidworks dwg and make a file that you could give straight to a cnc place + a foam model so you can check fit etc? pretty cool, wonder how much?

[PHULL]

fair enough I was struggling to figure out what it looked like from the discription..

I would go billet aluminum or welded sheet steel my self if I needed only 2 sets made... I understand you don't want a rose jointed front end, Elfin kit cars get away with this for a 4 link rear end with ptfe spearical joints, yet you go for a road worthy and you will fail if you have adjustable suspension..... sometimes it's just a interperatation of the rules if you know what I mean.

the bottom line is I bet you will be able to do it cheaper and have a more adjustable system than a slightly longer, non adjustable lower control arm. And you will still have to go through the same process to prove that it will hold up.

and you going to need an engineers for the brake upgrade anyway....

next time you are at a race meet take a look at the saloon cars adjustable front arms copy what they do

[Rollin]

I don't know much about the saloon cars, but I'm fairly sure they don't have ~500rwhp (which the engine I'm building at the moment will make easily) and 1550kg when they barrel down the back straight at QR....and I think they still have e-series offset, and I want AU.

It's a double wishbone front end so there is a lot of stress on the LCA through bending in the vertical (shock absorption) plane as well as all the other usual stresses...an adjustable rose jointed inner would be great for camber adjustment and reducing camber loss through bush deflection, but would it be able to hack the punishment?

I've had a lot of interest from people who want to buy these arms off me, lots of people have been talking about it for a long time, I'm just trying to make it happen. As gammaboy alluded to, e-series freaks are cheap cunts so I doubt I'll be able to retire to the Caribbean with 11ty profits, but that's not my main concern. I want to make this shit work for my car, if I can get it to work and then sell LCAs to others then it's a bonus.

[260BC]

Good for you for having a go but there is no way in the world that I would use anything cast in that application, never.

Look at the stuff American hot rod shops sell for suitable ball joints if that is a problem, I'd look at getting the arms fabricated from steel using jigs.

[PHULL]

I don't know much about the saloon cars, but I'm fairly sure they don't have ~500rwhp (which the engine I'm building at the moment will make easily) and 1550kg when they barrel down the back straight at QR....and I think they still have e-series offset, and I want AU.

It's a double wishbone front end so there is a lot of stress on the LCA through bending in the vertical (shock absorption) plane as well as all the other usual stresses...an adjustable rose jointed inner would be great for camber adjustment and reducing camber loss through bush deflection, but would it be able to hack the punishment?

I've had a lot of interest from people who want to buy these arms off me, lots of people have been talking about it for a long time, I'm just trying to make it happen. As gammaboy alluded to, e-series freaks are cheap cunts so I doubt I'll be able to retire to the Caribbean with 11ty profits, but that's not my main concern. I want to make this shit work for my car, if I can get it to work and then sell LCAs to others then it's a bonus.

the answer to your question is yes spearical joints will hold up. if you buy the correct ones. I didn't mean copy the saloon cars directly, but use it for inspiration.

[Rollin]

I had a look on google images trying to find another setup that would load the spherical joint the same way as mine will and didn't have any luck...Surely it's not designed to do what I wanna do?



Black = Lower inner and is the pivot point obviously
Red = Spring/shock assy
Green = Z bar /caster arm
Blue = Ball joint for upright
Yellow = forces imposed on the arm over bumps/by the weight of the vehicle etc.

I thought rose/spherical joints were for tension/compression and not bending? Unless there are uber massive ones available that are designed for this sort of thing?

[HoonBoy]

Looks like the average wishbone setup to me...

[PHULL]

Keep in mind if you put a rose joint where you have in the sketch it will have mechanical advantage over the damper.... the bending moment will be directly where the damper connects to the wishbone. and a greater portion of the bending force will be on the ball joint side of the wishbone.