930 Front calipers

[JOHN21BLACK]

Ready to put on 930 fronts and want to know does the 930 rotor bolt right on to a front 1984 911 carrera hub. I was told the rotors do, with a 21mm spacer. I have a wide body turbo look

[KTL]

The rotor will bolt right on to the axle hub. But the question is, which rotor are you using- the '81-'89 one piece rotor with the deep hat/bell, or the two piece '78-'80 floating rotor with the flat hat? If you have the one piece rotors you need the matching '81-89 deep offset hubs. Two piece floaters bolt right on w/out issue.

By the way you also need four spacing washers to properly position the calipers on the strut. They are part number 930.351.553.01 They're just larger diameter M12 washers that are ~3.5mm thick, if i'm correctly recalling the thickness by memory.

[douglas bray]

Everything is a secret. The guys that sell you one part won't tell you where to find the rest. Rotors can be found for half price on the internet. T-locks and the like are all sorted out here....I think.

Cleaning/Rebuilding 930 Calipers....

[unclebilly]

Search for a Bill Verberg thread on brakes... everything you need to know (and more) is in that thread...

Are you changing your master cylinder too? What about brake pads and fluid - what are you going to run?

[rfloz]

Originally Posted by JOHN21BLACK

Ready to put on 930 fronts and want to know does the 930 rotor bolt right on to a front 1984 911 SC. I was told the calipers do. I have a wide body turbo look

A couple of minor points - First, I'm pretty sure the last SC was in year model 1983.

Also, 1984 was the first year of the factory Turbo-Look, i.e., the M491 option. Those cars have Turbo front (and rear) brakes from the factory.

So, I'm assuming your car has had the Turbo fender flares added after it was produced. This matters if you are getting different wheels since, at least in the rear, the off-set will be different due to the M491 cars using different rear suspension attachment points and hubs, not sure about the front.

As suggested, look up Bill Verberg's brake and wheel fitment threads. Bill is very helpful if you still have any questions.

Anyway, good luck with your project. You (and Mr. Bray) will really like the 930 brakes.

[JOHN21BLACK]

Here are a few pics of my front rotors part#911.351.041.22 they are solid not floating. So, I will be ordering the new Part # 930.351.048.02.

[gumba]

If your using the later style 1 pc 930 rotor you need the later style 930 hub, which is about 1" thicker than the 911 hub. Otherwise the rotor won't line up with the caliper.
If you want to retain the 911 hub then you will need a custom hat to mount the earlier floating rotor. Another option is the Rennsport custom hat with a modified 993 turbo rotor. You will also need a 1" spacer to push the wheel out.

[JOHN21BLACK]

whats cheaper to get the custom hat from Rennsport and 993 turbo rotor or the later style 930 hub.

[douglas bray]

OP, look a little deeper at what we are saying. It appears you have an '84 narrow body hub. It is not a turbo hub. There is no 930 rotor that will bolt on without modification. You either go with a floating rotor from a '78 turbo, or you get a later rotor machined down, or you get turbo hubs. That seems to be the consensus.

[douglas bray]

LOL, you posted while I was typing. I went with floating rotors and am very happy. Got the hats from Rebel S Racing. Knowing me, it was likely the cheapest route. I know Steve Weiner does the later rotors but I have no idea the cost.

My thread has the links to the T-locks. My only concern about the floating rotors is that the driver's side is already "clunk"-ing. Hit a pot hole at speeds below say 20 mph and there is a noticeable clunk. Granted this was my first weekend out with them and we did about 300 miles. May not be the rotor at all.

[JOHN21BLACK]

so does my hub look like a s/c or carrera hub? or they are the same.

[douglas bray]

If the car is an '84 they are most likely Carrera hubs.

[JOHN21BLACK]

what year turbo hubs should i be looking for?

[gumba]

I paid around $900 for the Rennsport hats & rotors. Those rotors will last a very long time. The Porsche floating rotor is expensive and wears out. The 930 hubs are initially expensive but the 1 pc rotors are not. The 930 hubs if you can find them used will be in the $600+ range, new, I think they are in the $900 range. There is no cheap way into this.
The least expensive would be the Rennsport conversion.

[douglas bray]

Yikes....

Rebel hats $150/pair

Coleman Tlocks $85/set

Zimmerman rotors *g e e k* $376/pair

--------------------------------------------

total $611

not exactly $900

[gumba]

Not apples to apples either. You need to be a little more specific.

The Rennsport package is based around a Porsche 993 rotor. The rotors are around $280+ each, + hats & pads.

The Rebel ad doesn't mention what rotors come with their kits. They do mention you can use a Wilwood rotor. I was looking at that package a few weeks ago for a project.

I think you can only use a Coleman rotor with their hats. I ran Coleman rotors on our race car with 930 calipers. They lasted about 6 events before they warped.

Not sure what Zimmerman rotors yours referring to. If you go with the stock 1 pc. Zimmerman rotor for a 930 then you need the 930 hubs.

I'm not affiliated with Rennsport, or knocking the other companies. It's just information.

[Steve@Rennsport]

Just remember, floating rotors require maintenance; they are not a "set & forget" proposition.

For people unwilling to remove, disassemble and clean all the hardware from time to time so they continue to float, its not a great choice no matter how cheap they may be.

[winders]

I would argue that for most applications, floating rotors don't offer enough of an advantage to make the expense or maintenance issues worthwhile.

[JOHN21BLACK]

If the only difference from 930 hub to 911 is the 1"thicker 930. why not put a 1" spacer, so I can run the later style one piece 930 rotor with the 911 hub. This will keep the rotor and caliper line up the same. And bring out my rim and tire where its supposed to be on a turbo fender.Im just saying. Im no expert. just seems like it makes sense to me.

[LJ851]

Originally Posted by JOHN21BLACK

If the only difference from 930 hub to 911 is the 1"thicker 930. why not put a 1" spacer, so I can run the later style one piece 930 rotor with the 911 hub. This will keep the rotor and caliper line up the same. Im just saying. Im no expert. just seems like it makes sense to me.

-1" spacers would be hard to find.