they stop my supercharged bloody well

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Team SUPERCHARGED

I LIVE FOR THE 306

Old Project thread

Clicky: [url =http://www.306gti6.com]click here[/url] remove the space between [url =

You need a parachute or an anchor for them things

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Goldie the track car.

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need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

The reason there's so much scallop on my caliper brackets is that they were actually designed so they will take the bigger Wilwoods too, same as we used on the 4wd buggies at the time - although obviously they won't go under 15's. They'll also take Hispec's (which I had handy off the buggy)
I'll get a pic later.

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- Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM me
Email me!
Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces.

The original brackets are more than strong enough, the reason being by the time you make it thick enough to get plenty of thread in the caliper body where the caliper attaches, and enough thickness under the bolts to the hub to use the original bolts, then bracket itself ends up much stronger than it actually needs to be.
You could make it half the weight if you were happy spending a bit more design/machining time on it, I just shed as much weight as I could from the original Welly bracket whilst staying with a 2-op process to keep the machining time/costs down, whilst keeping the stiffness up (actually it's slightly stiffer than the heavier/bulkier Welly original).

If you look at the FEA of the bracket the only part that has heavy loading to the point where it starts to be a concern later on in the lifecycle is those first couple of threads where it bolts up (A short steel bolt into soft aluminium means much of the stretch is is in the initial threads so that's where the loading is concentrated, it doesn't get spread down the thread length very well).
The strength is no issue initially - you could snap the caliper bolt on a new bracket before damaging the thread - but as the bracket gets older the aluminium looses significant strength as it fatigues, and obviously it fatigues much faster where the loading is concentrated around sharp edges of the thread - for all this talk of things being strong enough, you don't design an aluminium structure around the initial material strength, you design it around expected fatigue cycles over it's lifetime, because aluminium will fatigue under any loading, unlike steel (if you check the original threads there's some mention of this when Midlife was asking about similar things).

That's why I went with forming rather than cutting those threads, because not only does forming give a stronger thread from working hardening the surface - so the effective loading reduces slightly - the imparted compression stresses in the root of the thread and the grain structure following the thread rather than being cut through give large increases in fatigue resistance themselves.
Basically they lose much less strength as they age than cut threads do, and the effect is only exaggerated as the temperature is increased, and give it's nature it gets some temperature cycles, obviously.
The threads could have been helicoiled for the same effect, but forming the thread alleviated the issue easily and doesn't give anyone issues with anodising as some of you had done later on.
I could have just popped a nut on the back but I prefer a little engineering finesse!

Anyway, I put a lot of work into making sure the brackets were lighter and safe - I wouldn't have sold them without being 100% certain that they'd be fine even with the most hamfisted fitter
So yes, I get a bit annoyed when someone makes a straight copy of it after I did all the work and then neglects the only important bit, and then starts mouthing off after I tell them how to fix it. It's not hard to see that they are formed, any engineer worth his salt only has to glance at the thread and they could tell you.



Sorry about the wall of text, but the TL DR is - there's a lot of work in that 'simple bracket'

________________________________________

- Bespoke rollcages/additions/adjustments. Half cages right up to complete custom spaceframes - MSA/FIA spec, CDS, ROPT, T45, etc - PM me
Email me!
Custom-made polybushes available - need an odd size or fitment? - anything from batch work to one-off pieces.

Look great anodised! I will fit mine to my car before I post them out just to make 100% sure they fit

________________________________________

Team SUPERCHARGED

I LIVE FOR THE 306

Old Project thread

Clicky: [url =http://www.306gti6.com]click here[/url] remove the space between [url =

Great now does anyone want to buy mine as I now have no need for mine

Chris did you sell everything to Mr Prebble by any chance ?
What's going on m8 ?

So just out of interest where do we get these callipers from as I can't seem to find the ones stated earlier in the thread ?

Rally Design stock wilwood.

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

http://bfy.tw/9778

________________________________________

need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

This calliper I'd not listed dude ?