BC

Any updates on any of the people doing this in this thread?

Vilhuer

Modified 928 GT hub, 996 GT2 6 caliper monoblock front brake, Cayenne 350mm disk and TSW 18" wheel. Trial fitment on workbench to see if hub modification is successful mod. Works fine.

RyanPerrella

What was modified with the hub to make those GT2 calipers fit. It looks like they bolt right up but you mention its a modified spindle, how is it modified?

RyanPerrella

Jim,

Any update on your setup? I would love to see what you ended up doing with your brakes.

Lizard928

Ryan if you look at the pictures the two "ears" which the caliper bolts to were welded on there and machined.

I would be leary about having a welded part there, but havent inspected the material enough. I thought it was cast though.

RyanPerrella

yeah your absolutely right, not someplace i want or need to go.

Great idea though

I need to figure out which 322mm rotors to put on my car now. 965 cast hole, 928 GTS, or 993 TT with aluminum hats? Any suggestions? Price is a concern.

I priced out the 993TT idea to about $650 with the hats not including shipping from 2 different places.

I dont know what the cost is for the 965 rotors yet. Will know tomorrow. Same story for the GTS rotors.

I am thinking that if the 965 rotors can be had for around $400 for the pair I will just do that.

Apparently the 993 compound rotors (which would be my top pic) have an offset difference of 6mm. I thought of maybe using a 6mm spacer but that seems too simple, it must be 6mm of offset in the opposite direction in which case the hub would have to be taller and would be the only way to solve the alignment problem.

Maybe i am missing something here though. Anyone else been here, done this with 322mm rotors? Are there any other options that i am missing or not aware of?

nine-28

I had also 6-piston Cayenne calipers to fit on my GT. Using a 350mm rotor it is close to impossible(GT2 or Cayenne) to machine an adapter for it. With a 380mm rotor there might be a chance but I'd still go for a GT2 caliper as it enables more clearance between the caliper and attachment surface. Eventually as I get the GT moving I'll have a few tough braking sessions( 160Mph->0) to make sure nothing will fly through the fender when the going gets rough.

FBIII

I would be leary about having a welded part there, but havent inspected the material enough. I thought it was cast though.

Spindles are forgings not castings certainly OK to weld. I imagine the bolts that mount the calipers run thru the spacer that has been welded on into the original spindle metal so that the welded spacer would not be bearing the load of the bolt .

largecar379

Correct me if I'm wrong, but aren't the spindles and arms (for attaching tie rod, lower/upper ball joints, and brake calipers) one piece?

I haven't looked at one lately (I probably should), but using your example, the whole piece would then be either cast or forged....?

[correction: the tie rod arm is bolt on]--rhj


--Russ

Olli Snellman

Somehow i got the impression that guys were able to produce an adapter for that GT. I have also studied this issue because we wanted to develope an adapter for six pot GT2 caliper for 951 S spindle (same as S4, GT,GTS etc.).
We have already kit for 951 spindle. At least here in Finland that welded spindle is illegal.... I suppose Erkka & friends are familiar that. Here's our 951 "kit" we had manufactured:



Caliper under my friends 951

drnick

nice work olli, will that fit on a 928? my 19s are making the big reds look puny! does this mean you can also use ceramic discs?

Olli Snellman

Yes we can use ceramic discs as well. Pictured disk is 996 Turbo unit. It's a direct bolt on unit to 951. Our cars are not M030 cars, so spindle has axial caliper mounting holes. We have not yet managed to fabricate adapter for 951S model, because it has radial type of attacment to the spindle, just like most 928's have. Newer monoblocks has 11mm difference what comes to distance of bolt mounting holes compared to old school calipers. I suppose it is easier use Cayenne calipers, because they have axial attchment to the spindle, so fabricating adapter is easier to do.

Vilhuer

Its virtually impossible to make adapter to fit GT2 or GT3 front brakes into "S4" front suspension. With 380 mm disk maybe but with 350 mm no way it will fit properly. If one wants to make it easy its better to change '84-85 front suspension from M593 ABS option car and use later ABS teeth ring. I'm not sure if all '84-85 spindles have mounting point for ABS sensor or not. If you want GT2 brakes Nick go this route.

Cayenne calipers are way to go if one wants to use "S4" hubs. Adapter for those is "easy" to do.

PS. Olli. we know. Mod is so well done that its virtually impossible to say its not stock once its painted. Guy who did it knows what he's doing. He's puting GT2 brakes into his old Saab.

drnick

mmm... is the stock 951 mounting the same as the 928 'S' or the earlier 928? does this expand the range of brake upgrades accesable to the earlier cars? im thinking of my 79 which already has 'S' brakes but for which i am wanting more braking but also to keep the stock phonedials.

Olli Snellman

If early 928 use the same "baby" 4-piston Brembo as 951, then it might be possible. What comes to disks, i suppose using some other (two piece disk) than OEM disk gives more possibilities especially if you are using custom made center section.


Erkka, i thought you sold your old "warrior"