BC

I really need to get some standard aluminum brake rotor hats for the S4 Hub to work with Big Black/Red 993TT/GTS calipers and 993TT rotors.

The standard GTS rotors do work, but the 993TT rotors are very good, if not better than the 993TT rotors. Other positives are that the 993TT rotor has alot of "Friends" in the aftermarket world, both grooved and totally solid.

This hat that I need made is specifically for this setup - S4 spindle and hub + Big red or big Black calipers + 993TT rotors. You buy the rotors and take off the wrong sized steel rotor hat and put this piece on.

Its a relatively simple piece, but I think if we had enough people go in on getting the design made that it could really get the cost down to a reasonable level - which would invite more people on the fringe to join in. Its a positive spiral.

There are some considerations:

Most hats are aluminum. Technically, in racing, you are supposed to replace the hats at certain cycles. The ones I have are used, and I will use them until I have others, but they are cracked, and you can tell the aluminum has been heated. I agree with a certain safety margin - so maybe getting two sets is a good idea, that should be good for several years - much longer if you do not track the car regularly.

Some people may want the ability to do floating rotor fasteners. I do not know how to do this and am open to suggestions. They are loud on the street, but become usefull for longevity on the track - reducing rotor flexing.

We COULD make them out of steel, and use the opportunity to make them THINNER, thereby slightly reducing the required backspacing for front wheels. But only by a few mms, and I am not sure the strength increase is worth the weight increase.

These are very deep hats technically, so its a chunk of aluminum about 3 inches thick at least. Getting the tolerances correct is very important, especially over the hub OD, and the specific offset for the proper placement of the rotor itself. I have these measurements, as I have original custom hats already. I also have the original 993TT hats for all other original dimensions.

What say you?

123quattro

My only input is I have NEVER seen a two piece rotor with a steel hat in a performance application. And I used to work in brakes.

Good idea trying to set up a group buy though.

Tom in Austin

Interesting thought ... would these offer advantages over the Linsday racing hats?

RyanPerrella

Brendan,

Arent you basically asking for what Lindsey Racing is already selling?

I would be interested in a lower cost ALUMINUM hat for S4 spindles to use either 993TT rotors with GTS calipers.

But Lindsey charges $300 for the pair, i assume your trying to have them made for less?

BC

You are speaking about these I assume:



I know about these, but are you saying that they are the exact same dimensions and offsets that we need? I was only aware of these fitting the 951. Not the 928.

RyanPerrella

951 and 928 S4 are exactly the same to my knowledge

These have been used with 993 TT rotors before on 928 GTS's

This is the direction i would go with rotor replacement on a GTS personally.

BC

There is some information from several years back that says the holes in the 993TT rotors need to be drilled out for the holes in lindsay's rotor hats.

I'm surprised there are not more people out there with GTS brakes on an S4.

BC

And yes, 300 dollars is alot for a machined piece of aluminum x2. The prices I have received from various places for a much more complex intake manifold "flange" is less than that.

RyanPerrella

I agree, i think the price is a bit high

If you can have the same thing made for less i maybe interested. I would need to really investigate the fit though and the material.

I have to be honest, i would love to find some 350mm rotors, produce a spacer to mount the GTS caliper farther away from the spindle to allow a 350mm rotor to fit and then have the correct hats for the job.

i would be interested in a hat that fits larger rotors and a spacer.

Then again the last i checked the 993TT rotors are $180 ish each and they would mount up with the GTS caliper as is so long as you have the correct hat.

I never priced a compound 350mm rotor minus the hat but i imagine they are more then $180 each. Who know's they could be less.

RyanPerrella

I really wish they offered them in Black or something. Gold doesn't match anything else on the car.

Actually they would probably look pretty good on your car Sterling.

BC

These come with hats for the 997:

http://www.vividracing.com/catalog/b...&filter_id=117

BC

Indeed. Purple is even more.

BC

They have grey. My color scheme requires gun metal grey metalic.

RyanPerrella

$1800 for a pair of compound rotors! LOL

i'll stick with the 993 TT rotors from Porsche

Honestly you just need a 350mm rotor x 32mm or 30mm (not sure which width) and your set. Its a fairly generic part. The hat is what makes it specific and we have that taken care of.

But i never did price out a plain 350mm rotor so i dont know, i would sure hope they are allot less then $900 each! I was thinking less than $200 each, if they are more then that then it makes the decision easy, just stick with the 322mm 993TT rotor and call it a day. No need for caliper spacers

BC

There is something to be said for longevity. If the 993TT rotor lasts x time and costs 200, but something else lasts x(x2 or 3) but costs 400, you could be ahead.