Anybody have '78 930 brakes?

[Porsche virgin]

Well I do. I love them. HOWEVER, I recently bought a set of Fuchs (16x6,7) and they don't clear the calipers. (See my ad in the for sale section. ) My '84 Carrera came with a set of ROH wheels (16x7,8), which obviously fit fine. If you have 930 brakes, what wheels are you using? Do cup wheels with spacers fit? If so, what size spacers? I'd prefer not to use them. Are there any wheels that fit without spacers (other than my ROHs)? I wanted a nice light set of Fuchs for around town and I was going to use the larger ROHs for autox.

Oh yeah, I tried the 7s on the front, but they didn't fit either.

Any suggestions would be appreciated.

[thethrill]

Try 1/4" spacers and you still may need to grind the fins of the calipers down. Typically, you gring the fins to be flush with the "Porsche lettering. I actually had to partially grind the Porsche lettering as well. It's SOP when installing these brakes.

Good luck.

[Jack Olsen]

They look and work great with Fuchs. The way it's typically done is to machine down the fins on the calipers, and run a very small (1/8-inch or 1/16-inch) spacer in front.

Or you can get 951-offset Fuchs.

[Steve@Rennsport]

Hi:

Those are the early '78-'79 Turbo calipers with the deeper fins.

All of these calipers need to have the fins machined down, expecially those. After that, all you'll need are 3mm (1/8") spacers.

[gumba]

The 951 7&8 x 16 fuchs have more web clearance on the back than the 911 fuchs. I ran them either with no spacer or a 1/4" spacer. I use a 1/4" spacer with 7x15's. I didn't grind the fins off. The picture shows a 7x15 w/1/4" spacer

[gumba]

Now that I think about it, I believe the fins are milled down to the same height as the porsche name, my mistake. Unfortunately the car isn't here to check.

[Porsche virgin]

Thanks for all of your quick responses. Of course, answers always bring more questions.

1) Can I "mill" them down with a dremmel while they are still on the car? Or do I need to take them off and grind them with something more serious.?

2) If I put 1/4" spacers all around, will they fit? I'm leery of spacers, I admit. Do I need longer lug bolts? It just seems like there wouldn't be enough bolt to hold onto the wheel safely.

3) If I use late 944-offset wheels, can I just skip it and go to Cup wheels without a spacer? Will either one of these rub?

Thanks again.

[don911]

I milled took my fins down with an angle grinder and then used a fine file so they looked milled. You can do it on the car but there will be a lot of little flakes of metal everywhere. Make sure you do a good clean up on the car after.

My 911 7s needed a 5mm spacer to fit even after I took the fins down.

[rdane]

Mine is a '79. 7 and 8, 944 wheels should eliminate any milling.

8" 944 wheels in front and a 9" 930 wheel in back will eliminate any milling. This is what I am running now.

I ran 7 and 9s from an '86 turbo for 2 years but needed to mill down the front caliper (smooth and no logo) to take the standard 7" fuch without a spacer.

[Porsche virgin]

So, let's see if I've got this.

Grind down the calipers AND buy 1/4" spacers, then I'll be able to fit these 6s and 7s. That seems like a lot of work for these skinny wheels.

OR

Shoehorn a set of 951 8s and 9s under the wheel wells. Then I have to roll (or cut) the fenders and run extra negative camber.

There has GOT to be an easier way.

[rdane]

You can buy a set of custom 8 and 9.5 wheels that clear 930 brakes. I have a set currently for sell on Pelican. Or pony up for a set of Fikse.

Or run 7 and 8 951 wheels.

Most want more tire when they run 930 brakes so you can actually use the brakes as intended.

Helps to remember these cars ('78) came with 6x16 and 7x16 as a special order. Other wise you got 6x15 and 7x15s from normal production. It was a BIG jump leaving behind 185/70/15 and 215/60/15 tires! 16" wheels first ran 205 and 225s!

The 917 brakes (which is where the "930" brakes came from) you are now using on your car came off a 240mph, 1200hp car running and 12x15 front and 19x15 rear wheels, weighing 1862#.

Imagine how those same brakes work on skinny tires? I think it is safe to assume any where short of llooonnngg track days the SC brakes would have done the job just fine

[Porsche virgin]

rdane,
You make a really good point about the brakes. There is NO WAY I'm using all of the braking capabilities of these things.

What size spacers did the '78 & '79 930s come with? Anybody know?

I should suck it up and grind down the damn things, then my options for wheels grows tremendously, huh? If I do that, I just need the 1/4" spacers and I'm good to go.

[rdane]

PV, I got bite the same way. My suggestion? Buy a set of 8" 944 wheels to go up front and a set of 9" 930 wheels and leave the calipers alone. Not a cheap date but the way it really should be done. You'll need to roll the front fenders as well.

But I also bought a set of 1/4 spacers last night to run 7 and 8 x 15s. Total cost just over $50 delivered.

I have a shaved front caliper and not positive they fit but they should.

The 930 spacers are huge and expensive. You can't run those spacers on an SC...as they are too big and won't fit.

[Porsche virgin]

Let me know if the 1/4 spacers work with those 15" wheels. Are they from a 944? Are you going to try to put them on soon? I may wait and use you as my guinea pig!

I know that 8s and 9s is my best combo, but now we are talking $$$. If the 7s fit in the front with a little bit of shaving and a 1/4 spacer, I'll suck up the cost of a set of 951 8s for the rear.

My business partner (wife) says I should just sell 'em and start over again.

[rdane]

Sell brakes or wheels? My new 7 and 8s are regular 911 15"s.

I'll know later in the week.

951 8s go in the front 9" 930s in the rear.

[Porsche virgin]

Part of the reason I bought my car is that it has these brakes, so I'm not giving up on them! I'd sell the wheels.

Hey, why are you selling your custom Fuchs to put on 15s? Weight reduction? What size tires are you going to use?

What year is your car?

[rdane]

Originally posted by Porsche virgin
Hey, why are you selling your custom Fuchs to put on 15s? Weight reduction? What size tires are you going to use?
What year is your car?

My car is a '79. 15's Fuchs are for weight reduction on the street. SO3s 205/50 in front and a 225/50 in the rear.

I have another pair of custom 8 front and 9.5 rear x 16 for the track. Running 225/50 and 265/45 on those.

[Porsche virgin]

Update for anyone interested:

I borrowed what measured out to be a 6mm spacer from my mech.

With the 930 brakes, the 7s just barely fit in the rear.

In the front, the 7s fit over the caliper, but were outside of the fender. They clearly didn't fit. The spacer pushed the wheel too wide. The 6s with the spacer almost fit, and the caliper will just need to be slightly ground down.

A 1/4 inch spacer all around should get me by until I have the time (and weather) to grind down the fins so I can fit other wheels.

The thread on the difference between 951 and 911 7s will be particularly helpful in the future.

Thanks for everybody's help.