50 replies to this topic

[TheRealVXed]

 

 

It's a thought in my head and I need some scrappers to measure from.  It might be non-productive but worth thinking about.

 

If you're interested my thought was this:

Can I pattern some uprights same as OEM with a raised hub centre? 

I then also wondered if I could include a wider HCB hole to match the fronts.  The reason for this is that the shims on the front are available in 3mm whereas the rears are only 1mm.  I don't like the idea of a feck load of shims and if I'm patterning it I could change this.

I also thought about extending the caliper mount to make 308mm discs an option.

I'd then cast (in SG nodular iron)

nothing as good as tonies uprights would be 
 

 

 

They have the bearing assembly in the still as can't get those out without some kind of press I would imagine due to the rust having fused the two together, but you are welcome to them.

 

The shim thing shouldn't be an issue on the rear, I have only 2 shims in there, 1 part 6 and 1 part 7 here, I do run quite a bit of negative camber though as my car is set up mostly for track work (340R track geo with 2.7 degrees of negative camber) https://www.speedste...r hub/image.png

 

If you want the hub carriers, let me know as they are likely going for scrap otherwise.

[paul_mck]

whats the master cylinder mod?

[TheRealVXed]

whats the master cylinder mod?

 

When I was adding the 4 pots to the front and the 2 pots to the rear I found the pedal very light after the modification.  To combat this, I went searching for a larger master cylinder and found the Cayenne turbo >2004 was a close match to the configuration of the VX220 MC.  http://www.vx220.org...dal/?hl=cayenne

 

You have to machine the mating face to the servo as it is a slightly different size, but I have the diagrams for this with all measurements to give to a machine shop in order for them to do it for anyone who is interested.

 

Once machined, fits like a glove and vastly improves pedal feel.  

[sford]

Could you send me the details? I have a small milling machine and would like to see if it's something I could do. 

[TheRealVXed]

Could you send me the details? I have a small milling machine and would like to see if it's something I could do. 

 

Sent you a PM

 

ETA: My local machine man charged me £10 to do this

Edited by TheRealVXed, 15 April 2020 - 02:17 PM.

[FLD]

 

 

 

It's a thought in my head and I need some scrappers to measure from.  It might be non-productive but worth thinking about.

 

If you're interested my thought was this:

Can I pattern some uprights same as OEM with a raised hub centre? 

I then also wondered if I could include a wider HCB hole to match the fronts.  The reason for this is that the shims on the front are available in 3mm whereas the rears are only 1mm.  I don't like the idea of a feck load of shims and if I'm patterning it I could change this.

I also thought about extending the caliper mount to make 308mm discs an option.

I'd then cast (in SG nodular iron)

nothing as good as tonies uprights would be 
 

 

 

They have the bearing assembly in the still as can't get those out without some kind of press I would imagine due to the rust having fused the two together, but you are welcome to them.

 

The shim thing shouldn't be an issue on the rear, I have only 2 shims in there, 1 part 6 and 1 part 7 here, I do run quite a bit of negative camber though as my car is set up mostly for track work (340R track geo with 2.7 degrees of negative camber) https://www.speedste...r hub/image.png

 

If you want the hub carriers, let me know as they are likely going for scrap otherwise.

 

 

Yes please!  I have a press so no issues there
 

[joshua]

Could've gone tesla roadster uprights to get 308mm rear discs in. :nod:

ETA: whats your plan with the old uprights?

He's going to donate them to Tonnie so that he can make some rear aluminium gt hubs.....

He's going to donate them to Tonnie so that he can make some rear aluminium gt hubs.....

Happy to do so, but they are rusty AF and it will cost a sample set of aluminium GT hubs

In all seriousness, I don't mind if you want the old hub carriers?

It's a thought in my head and I need some scrappers to measure from. It might be non-productive but worth thinking about.

If you're interested my thought was this:
Can I pattern some uprights same as OEM with a raised hub centre?
I then also wondered if I could include a wider HCB hole to match the fronts. The reason for this is that the shims on the front are available in 3mm whereas the rears are only 1mm. I don't like the idea of a feck load of shims and if I'm patterning it I could change this.
I also thought about extending the caliper mount to make 308mm discs an option.
I'd then cast (in SG nodular iron)
nothing as good as tonies uprights would be

This is a good plan, I had similar thoughts at one time.
Have you chosen an amount to raise the hub centre?
Is the modular iron strong enough to the original pattern or would you beef up the structure?
Radial calliper mounts would indeed be handy.

[Arno]

Is the modular iron strong enough to the original pattern or would you beef up the structure?

Originals on the VX and S2 Elise are forged steel, not cast-iron.
 
Design is/was a stress-optimised design from Lotus-Engineering as a demonstration and research project for the American Iron and Steel institute on how close they could come to the weight of aluminium uprights but using steel.
 
Copy of the published doc HERE
 
If it were to be done in cast-iron I'd expect it to need quite a bit of beefing up to handle stress and flex points compared to steel.
 
Bye, Arno.

Edited by Arno, 17 April 2020 - 12:24 PM.

[joshua]

Is the modular iron strong enough to the original pattern or would you beef up the structure?

Originals on the VX and S2 Elise are forged steel, not cast-iron.

Design is/was a stress-optimised design from Lotus-Engineering as a demonstration and research project for the American Iron and Steel institute on how close they could come to the weight of aluminium uprights but using steel.

Copy of the published doc HERE

If it were to be done in cast-iron I'd expect it to need quite a bit of beefing up to handle stress and flex points compared to steel.

Bye, Arno.

Excellent info thanks Arno.

Who would have thought reading a document about humble uprights would be so engaging?!
Turns out the uprights on our cars are sophisticated bits of kit. What a shame they always end up looking like c**p.

It’s interesting the early phase of the Elise S2 rear upright development had noticeably raised hub centres. Perhaps the plan was to run the car at a lower ride height?
It’s also interesting looking at the stress imaging it can be seen where a new cast upright would need beefing, especially as a raised hub centre would add stresses around the lower links.

Being air cooled forged steel the uprights can be welded if the joint is well thought out.

I modified my rear uprights to drop the upper wishbone outer link to an angle similar to standard ride height but at 112mm ride height. The lower link I left alone. This re established almost exactly the OEM rear bump/camber curve and cleared the wishbone of the subframe but dropped the roll centre slightly.

[TheRealVXed]

I got bored and decided to fit these switches for the lights as all the bulbs in mine are broken Only took me about 10 years since buying them

 

 

[FLD]

 

Is the modular iron strong enough to the original pattern or would you beef up the structure?

Originals on the VX and S2 Elise are forged steel, not cast-iron.
 
Design is/was a stress-optimised design from Lotus-Engineering as a demonstration and research project for the American Iron and Steel institute on how close they could come to the weight of aluminium uprights but using steel.
 
Copy of the published doc HERE
 
If it were to be done in cast-iron I'd expect it to need quite a bit of beefing up to handle stress and flex points compared to steel.
 
Bye, Arno.

 

 

Well, that's pi55ed on my chips then (although potentially saved my life). 

 

Might make it one to CNC from billet.