Not bendy wishbones BUT...
Discussion
Hej Mikael,
what are your thoughts regarding an upgrade? Are there any ideas out there how to "stiffen up" the flanges. I`ve seen similar effects on my car but wasn`t sure what caused them (probably me during the build). The stronger rose jointed suspension doesn`t change the flanges.
what are your thoughts regarding an upgrade? Are there any ideas out there how to "stiffen up" the flanges. I`ve seen similar effects on my car but wasn`t sure what caused them (probably me during the build). The stronger rose jointed suspension doesn`t change the flanges.
Edited by SchimmS on Sunday 26th October 12:19
SchimmS said:
Hej Mikael,
what are your thoughts regarding an upgrade? Are there any ideas out there how to "stiffen up" the flanges. I`ve seen similar effects on my car but wasn`t sure what caused them (probably me during the build). The stronger rose jointed suspension doesn`t change the flanges.
I think the easiest mod would be to box them by welding a "roof and floor" that connects the flanges.what are your thoughts regarding an upgrade? Are there any ideas out there how to "stiffen up" the flanges. I`ve seen similar effects on my car but wasn`t sure what caused them (probably me during the build). The stronger rose jointed suspension doesn`t change the flanges.
Another solution could be to weld another set of flanges outside the stock ones so they become two layers.
A third would be to cut them off and replace them with something else, probably a solution that accepts the balljoint to be mounted as they are designed for. (tiltet 90 deg from Ultimas ball/rosejoints are) The third alternative feels to complex for my taste and budget...
Yep - I had that. Nowhere near as extreme!! Perhaps 3mm forward.
The Factory thought it might have been curbs at trackdays. I maintain it was the rolling road session I did, the chassis being tied down and the wheels trying to tear themselves off. And that was with a measily 497 at the fly.
Have you RRed it?
Pete
The Factory thought it might have been curbs at trackdays. I maintain it was the rolling road session I did, the chassis being tied down and the wheels trying to tear themselves off. And that was with a measily 497 at the fly.
Have you RRed it?
Pete
Perhaps there chassis isn't good for 1000bhp after all..... always thought that was a bit tongue in cheek.... no doubt they will reply with "only on road tyres" but it either is or it isn't.... those brackets on the rear lowers are a little longer than any other of the Chassis mounts, and they do transmit all the power to the car, but that's still not right.... very easy to mod though....
deadscoob said:
Simon,
Do you think an Elise would stand up well with 800ish hp/lb ft?
well, the only Elise's with 800Bhp are the old GT-1 cars, they had no chassis issues, however, the relevance of this is somewhat stretching it... Do you think an Elise would stand up well with 800ish hp/lb ft?
the issue here is one of bad design, the wishbone mounts are only sheet steel tabs in one plane, fine for the vertical /lateral loads of the wishbones but does nothing to support the drive/braking forces placed upon them, it's hardly surprising they have bent, you imagine what's going on when you do an enthusiastic take off with your 400+ Lb/Ft torque V8 against all the inertial of ~1,100Kg's of car+fuel+you is pushing sideways on those tabs.
I am somewhat surprised that the tabs do not have a horizontal component to them to support these loads ie, joining the two tabs together with a horizontal top (ie so it looks like a upside-down U) would probably be enough to prevent this happening.
Edited by Scuffers on Monday 27th October 07:44
deadscoob said:
Presumably this has happened because although the toe link acts to keep things tied down, that's forcing a twist which has caused the tabs to bend?
No.Think about it, the wheels are driving the car forward, they exert said force onto the upright (via the bearings), this in turn then is transmitted to the chassis via the wishbones, effectively it's trying to push them forwards/round.
now, depending on the wheel/hub offset and the angle of the 'A' in the wishbone defines the exact direction of the forces on the chassis mounts, essentially, the rear of the 'A' will be subjected to being pulled out and forward, the front pushed in and forward. Traditionally, the front leg of the lower wishbone is treated as a trailing arm as much as a wishbone.
Guess this problem is a critical question which needs a reply from the factory. I certainly would not like to see this kind of thing happening on a car, nor the consequences in case of an accident. I dont't dare think about it. Certainly puts a question mark to what is said concerning the chassis built to take 1'000hp.Edited by UltimaCH on Monday 27th October 13:52
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