robot808

xschop, have you looked into what type of wheels this will work with yet?

xschop

Tim Nagy is doing a test n tune at Tigpri. And they are on a few other 948's. I'll ask what they are running.

BC, the easiest way to get mounting dimension is to run a straightedge across the top of spindle flat, measure from there to hub seal O.D. then add the radius of the hub seal.
If it is 86.8mm then it is the same geometry as the 944 TurboS (M030) spindle.

BC

I can't quite picture what you mean by add the radius.

xschop

1/2 of the diameter of the inner hub seal interface that is machined onto the spindle. It is a large machined step.

Snowglobe

bump

KenRudd

I'm running GTS Fronts on my S3 using the Perfex Kit:

SeanR

I'm really surprised our local automotive engineer has not been in here telling us how this needs to be destructive tested to ensure it is up to some sort of great standard Must only happen in Gregs/Rogers threads

TexasDude74

I was thinking this should be tested by Porsche themselves for a couple years at the ring prior to being released. Or what if the clearences are too tight and the brakes won't work below the -50° temps at the south pole? Eh, sharks eat penguins don't they?

69gaugeman

I was away on vacation. Sorry to disappoint.

This unit looks to be perfectly capable of performing its function. Large radii at the base of the stand-offs indicate an understanding of material fatiguing. Or at least it will stand up to those forces.

The forces on this part are significantly different than on the shafts. If i saw something that would concern me. I would bring it up.

Why would Porsche test this? They have perfectly adequate brakes for this car.

Now if you asked me if this is necessary, I will say that in almost all cases, no. If you are driving your Porsche 928 beyond what GTS brakes can do for you, you are in a very small minority.

What does Mark Anderson use? Or Kibort?

69gaugeman

You want to insulate ,as much as possible, the caliper from heat to prevent fluid boiling. This looks like it would do the trick

xschop

The Porsche calipers do not hold a candle to these Integras. They overheat and boil the fluid long before these break a sweat. Thicker pads is one reason but the piston design on the Integras are Therm-lock trademark and of course 6 vs 4 piston.

I have built tons of custom parts and brake kits for these cars over the years and have yet to see one of the adapters fail. Even Wilwood's Integra adapters don't have the amount of material around the bolt holes that I incorporate into these. If you are worried about Porsche-designed longevity, then you need to consider tossing your A390 block as it's just a matter of time before the heat cycles catch up. Same goes for the crap-forged P-calipers that reach their heat cycle limits where they become un-rebuilable from the severe heat gauling of the pistons.
.....Should be getting a report back from Barber on these.

xschop

Centering rings are made from 4140 steel....no gauling there either...
I'll have sets on ebay later tonight.

James Bailey

Mark had F-40 six piston front brakes, huge rotors on hats....Kibort has GTS rotors with spaced out S-4 calipers...

xschop

I've done the mock-up for a set of F50 calipers on the Cayenne rotors too. Not going to let the cat out the bag on those yet as there is a newer Audi that uses those Brembos and I know those sets havent been baked. Should be scoring another set soon.

BC

X,

This is not an exact measurement bit it gives you an idea