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diamond cutting standard evora wheels. - Ride/Handling/Suspension/Brakes/Wheels/Tyres - The Lotus Forums Jump to content
andyj007

diamond cutting standard evora wheels.

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i know diamond cutting requires  little more maintenance , but looking at the standrda 18-19" wheels, it looks like they may diamond cut and make a real nice pattern on the spokes....

any one ever seen any attempted?

guess it would turn the standard wheels into something like the following...   not sure its even possible..  thoughts?

 

 

Lotus-Evora_400-2016-1600-24.jpg

lotus-evora-400-live-ginevra-2015-6_restyling.jpg

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The only thing I could think of that may be a concern would be how much machining would be required to get the look of the original diamond cut wheels without taking too much metal away?

Not sure how you would get the specifications on measurements?

Are the diamond cut wheels produced by the wheel company prior to painting as on the standard wheels, which would potentially make the standard wheels a tad stronger and possibly heavier?

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i dont know, but a local respected wheel firm said they could skim just the blades and rim no problem... this is done after the first colour is applied but pre laquer. as with all diamond cut, your very open to the odd stone chip in the laquer causing the peeling effect,  so way more maintenance.... and cost to refurb in future

 

 

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I would never do a DC treatment of none DC designed wheels.
But I suspect the beefy original forged Lotus wheels can be okay 😉 

Upper class forged wheels which will get a DC treatment are normally milled thicker first so that they do not get "under measured" after the additional DC milling … at least this is how I have decided to have produced my Leitspeed wheels for the Evora. With that technique you can cut off slightly more material and get a nice mirrored surface and the static of the wheel is fully unchanged which is most important for lightweight wheels.
Check Infos here: www.leitspeed-wheels.de

 

IMG_5568.JPG

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thanks steffen..  i respect your advice..  will just have to save for a set of yours :)

 

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21 hours ago, Steffen_Leitgeb-LSWGmbh said:


I would never do a DC treatment of none DC designed wheels.
But I suspect the beefy original forged Lotus wheels can be okay 😉 

Upper class forged wheels which will get a DC treatment are normally milled thicker first so that they do not get "under measured" after the additional DC milling … at least this is how I have decided to have produced my Leitspeed wheels for the Evora. With that technique you can cut off slightly more material and get a nice mirrored surface and the static of the wheel is fully unchanged which is most important for lightweight wheels.
Check Infos here: www.leitspeed-wheels.de

 

IMG_5568.JPG

This is pretty much what I was alluding to as well. Not as simple as just removing the paint. Time to start saving.

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there bloomin lovely :)

 

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14 hours ago, andyj007 said:

there bloomin lovely :)

 

Thank you. I put a lot of thought and work into these wheels. They are high end all around and even more lightweight than any other option in 19/20" for the Evora.
I hope it shows.

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My understanding is the the original 400 forged alloys (per Andy’s photos above) were originally intended to be diamond cut - hence the Geneva show car. However, before the first production run a decision was made not to diamond cut the wheels due to potential warranty claims - the diamond cut surface being tricky to lacquer. 

This is what the factory told me whilst I was choosing my final spec when I was at Hethel.

Given the above, I Believe the 400 forged alloys are structurally OK to diamond cut, but the warranty would be invalidated on the wheels.

Greg

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They had many issues (and claims) with the diamond cut Exige wheels that they removed the option in early 2015.

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DC wheel's are indeed lovely things, but sadly they have an achilles heel - the lacquer coat struggles to maintain its purchase on the machined surface.

Corrosion is therefore never far away... and you only get a couple of goes at re-machining them before you run out of material and have to either get them blasted and painted / powder-coated.

Such a shame as the OE 'Design' 19"/20" wheels on my car look fab with a DC, but the corrosion is now too noticeable, so it'll soon be time to get them painted / powder-coated.  😔

 

Steffen - your wheels are stunning!  👍

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1 hour ago, Gm77 said:

My understanding is the the original 400 forged alloys (per Andy’s photos above) were originally intended to be diamond cut - hence the Geneva show car. However, before the first production run a decision was made not to diamond cut the wheels due to potential warranty claims - the diamond cut surface being tricky to lacquer. 

This is what the factory told me whilst I was choosing my final spec when I was at Hethel.

Given the above, I Believe the 400 forged alloys are structurally OK to diamond cut, but the warranty would be invalidated on the wheels.

Greg

Not to mention the number of wheels you need to dc before finding some without casting defects.

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The first reason why I ever looked into making a wheel for the Evora was the unsatisfying surface of my Evora S forged wheels. Both sets 18/19 for winter use and 19/20 for summer were no longer acceptable after 4 years of use.
For two reasons: a) by design of the wheel, it has sharp edges where the coating thickness was not okay and b) the base coating was wrong or too thin or simply missing (!) so at my 19/20 the wheel colouring simply peeled of and fell off.
For the same design reasons the 19/20 of Evora S are not really "stable" on the final colouring of the DC wheel and the DC seemed to be a design afterthought here too.
These wheels are really fine when getting a professional powder coating. 

Just after being disappointed with the wheels surface I was checking weight and found also big improvement possible.
My focus was weight reduction and surface improvement over the basic Lotus wheels. 

The surface of DC wheels is down to the forging pressure, raw material and wheel design.
Our wheels for all Evora types are designed that DC can work longer because it was not an afterthought.
If you use 8.000 ton forging the material is normally so packed that a material corrosion is not so big like with casted wheels. 
If the clear coating material and the spoke design are alright the clear coating does not allow that salt or humidity gets underneath at the edges unless the surface is damaged by impact(s).

Our surface treatments in my partners factory:

- inspection and hand cleaning of the raw machined wheel to round off sharp edges 
- pea shooting whole wheel to make the right surface for further coloring
- powder base coating 
- first colouring layer
(optional DC treatment with slow processing speeds, in case of of the LS01 the wheel has a thicker design to have it cut off more material)
- final coating

This treatment is a little different to classic (forged) racing wheels which are not protected so well because they are consumables anyway.

As we would be able to also do forged magnesium wheels with German TÜV license (already a prototype was corrosion tested out of curiosity and the test was passed successfully) this surface treatment looks alright to me.

In general in Germany (for German cars Mercedes, BMW, Audi, Porsche) DC is a basic design for many many casted and forged wheels. There is no huge quality problem known to me at the moment even with casted wheels which are indeed not so good for DC like forged alloys.

 
But in any case the DC wheel is not a wheel for track use and it should be driven more carefully than non DC wheels.
And corrosion level after a damage is also influenced of the area driven - coastal areas with a lot of salt in humid air are always more critical than others. 
I would expect in UK DC is more critical than in Arizona for example. But of course I keep fingers crossed that DC customers do not run on very bad roads where stones or gravel will impact the last clear coat layer heavily 😉




 
 
 

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Having had DC wheels on a number of cars from numerous manufacturers, I can understand why Lotus removed the option.  Whether it's OE wheel from Porsche, Mercedes or BMW they all suffer from corrosion through normal use and gentle cleaning here in the UK, even if they've never seen a kerb.  Sure, some of the designs look great, but they are more trouble than they are worth IMO.

Steffen's wheels do look great though and the manufacturing process sounds first class 👍

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The agency in Dubai ordered their first 400 with diamond cut wheels. The agent said Lotus resisted, but he insisted and they desisted. 😝

 

67FF1EC2-1B76-436F-8AEE-F6522D44B1B9.jpeg

EC860712-94CD-4734-8629-7F005B9CC21E.jpeg

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Not the same of course, but might be worth considering....

i had my VXR8 wheels refurbed by The Wheel Specialist in “smoked chrome”. Which is basically:

- powder coat black

- hand spray silver “face on” only

- clear powdercoat

this leaves the sections other than the face pretty much black.

Not as “crisp” as diamond cutting, but a very pleasing finish, and very robust.

before

plAw5wp.jpg

After

WP7sXd3.jpg

 

TWS “sample wheel” 

JIQhspu.jpg

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Hm. Honestly we have just discussed such a coloring solution to prevent potential corrosion problems in some markets with the specialist for the finish of the wheels in production.
Simple solution: we would rather shoot ourselves than using such a 2 tone colouring 😉
 

 

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Hmmm...to be fair I think @mik solution looks reasonable - albeit not as nice as your Diamond Cut ones @Steffen_Leitgeb-LSWGmbh 

I would agree that if the cost isn't a concern then yours are certainly the way to go - not least because of the massive weight saving 🙂

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2 hours ago, Steffen_Leitgeb-LSWGmbh said:

we would rather shoot ourselves than using such a 2 tone colouring 😉
 

 

😁

They looked great in the metal, but were almost impossible to photograph.

I dont think the finish pictured above would work on an Evora S1 forged wheel - the spokes are too heavily tapered, so spraying face-on would coat the "sides" of the spokes too.... might work on an Evora400 wheel - dunno. 

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1 hour ago, KAS-118 said:

Hmmm...to be fair I think @mik solution looks reasonable - albeit not as nice as your Diamond Cut ones @Steffen_Leitgeb-LSWGmbh 

I would agree that if the cost isn't a concern then yours are certainly the way to go - not least because of the massive weight saving 🙂

Big weight saving is always heavy on the budget. Just check Lotus` spec lists for the Exige V6 410 or Evora 410 f.ex.
And wheel weight reduction really works perfectly well.
So first it is performance. Second is fashion.

 

 

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