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Front Wishbone Dimensions


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#1 Nev

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Posted 06 August 2019 - 06:44 AM

Does anyone happen to have the front wishbone dimensions please? Things like bush centre to ball joint centres and triangulation angles please?



#2 Ormes

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Posted 06 August 2019 - 07:02 AM

Could be wrong but think Aerodynamic was looking at this.

#3 FLD

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Posted 06 August 2019 - 07:41 AM

I have some off the car you can borrow if it helps? Not sure how easy that would be to measure accurately though.

#4 Nev

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Posted 06 August 2019 - 10:48 AM

Any info would help Matt (or anyone else) please, I'd like to model the OEM setup and understand it fully.

 

Am considering designing and making my own, with approx 22mm more length (i.e. widening the track), reducing the KPI to about 6 degrees. Several advantage to this I think. I know I have the EP uprights, which fix with the ride height issue, but they can't help with the stupid stubby OEM arms which induce so much bump steer and camber offset when cornering sharply.


Edited by Nev, 06 August 2019 - 10:49 AM.


#5 FLD

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Posted 06 August 2019 - 10:57 AM

AtomX was doing something similar; can you search for his posts to see what comes up?



#6 Exmantaa

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Posted 06 August 2019 - 06:39 PM

A VX has the Elise S1 wishbone geometry up front.

You can fit S2 top wishbones, that from my mind are 8mm longer each side.

The V6 model should be even longer, but no clue on exact length.

 

You're copying Joshua's set-up? Take note that he machined his uprights and/or steering arms to get the negative camber back...

Did you ever measure your current bumpsteer curve? Several cheaper solutions to fix that if too excessive... :happy:



#7 Aerodynamic

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Posted 07 August 2019 - 11:30 AM

The lower front wishbone on the Speedster is from center of bushings to center of ball joint 378mm

and on the S2 it is 386mm.

 

Upper wishbone on Speedster is 230 CC.

I guess it is 238mm on the S2 then.

 

Exige V6 should be 15mm longer. But not sure about this.



#8 Nev

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Posted 07 August 2019 - 01:29 PM

Thanks for the input guys.



#9 joshua

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Posted 08 August 2019 - 09:26 AM

Nev you would need to machine front hubs/arms approx 16mm total for 6° KPI on a standard car. But with your GT front hubs and arms were these not designed to allow more neg camber so you might get away with just machined arm? How many shims have you behind steering arm and at what static camber? IMO it would be a pity to make up wishbones and not alter the KPI. For 5° KPI my upper wishbones are +20mm.

#10 Aerodynamic

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Posted 08 August 2019 - 09:37 AM

How are they 20mm longer?

 

Any Picture, how you made them longer?

 

Br, Per

 

Nev you would need to machine front hubs/arms approx 16mm total for 6° KPI on a standard car. But with your GT front hubs and arms were these not designed to allow more neg camber so you might get away with just machined arm? How many shims have you behind steering arm and at what static camber? IMO it would be a pity to make up wishbones and not alter the KPI. For 5° KPI my upper wishbones are +20mm.

 



#11 joshua

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Posted 08 August 2019 - 11:03 PM

Attached File  IMG_7534.jpg   285.2KB   8 downloads



#12 Exmantaa

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Posted 09 August 2019 - 08:24 AM

The OEM V6 top wishbone got some reinforcements from Lotus for the increased length.
There's a new one on Ebay right now: Ebay 273816208489
 



#13 Ormes

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Posted 09 August 2019 - 11:53 AM

Nev you would need to machine front hubs/arms approx 16mm total for 6° KPI on a standard car. But with your GT front hubs and arms were these not designed to allow more neg camber so you might get away with just machined arm? How many shims have you behind steering arm and at what static camber? IMO it would be a pity to make up wishbones and not alter the KPI. For 5° KPI my upper wishbones are +20mm.

 

Nev I have some re-conditioned arms you could buy :)

 

Alternatively, the Elise Parts arms give an extra 1 deg as I understand it.

 

thumbsup



#14 joshua

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Posted 09 August 2019 - 09:51 PM

The OEM V6 top wishbone got some reinforcements from Lotus for the increased length.
There's a new one on Ebay right now: Ebay 273816208489

Probably down to extra weight of car as much as increased length.
I used same spec tube but 22mm O/D up from 19mm of oem.

#15 Aerodynamic

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Posted 11 August 2019 - 08:45 AM

Ok so these you buildt yourself?

 

I dont know where I got it from but I thought you elongated them.

 

Thanks, looks good.

 

Br, Per

 

 






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