Boxster brake conversion - '73 911

[91133]

Looking at the Pelican conversion kit and wondering if anyone has experience of installing on a pre-impact 911? Main question - will it fit inside 7&8x15 Fuchs? Thanks.

[Bill Verburg]

Originally Posted by 91133

Looking at the Pelican conversion kit and wondering if anyone has experience of installing on a pre-impact 911? Main question - will it fit inside 7&8x15 Fuchs? Thanks.

perhaps you could elucidate on the reasoning for this?

[James Brown]

i don't think they will fit under the 15's. the turbo breaks will

[TRE Cup]

They do fit under 15 rims, steel or alloy. That was one of our reasons for developing this kit in the first place.

With 930 brakes, there is a little more work and expense and they will fit under 15" rims too.

[James Brown]

well thats good, good brakes for a "r" car

[Nostril Cheese]

it will fit, but its not really something that adds a whole lot over the stock brakes..

[91133]

Thanks for the responses guys. Having to replace splayed Alu "S" calipers and saw this kit was available so the first question before further 'research' was the "will they fit?" one.
Interested by the last comment that the Boxster brakes would offer no better performance - on paper, they should be much better than on a standard F series S?

[Bill Verburg]

Originally Posted by 91133

Thanks for the responses guys. Having to replace splayed Alu "S" calipers and saw this kit was available so the first question before further 'research' was the "will they fit?" one.
Interested by the last comment that the Boxster brakes would offer no better performance - on paper, they should be much better than on a standard F series S?

It depends on what you mean by better

if you just do the fronts you get ~25% more brake torque in front, but nothing has changed in back so bias goes much more to the front, is that what you want?

If the S was fine then why not replace w/ S or A

If you are overheating the brakes then maybe wide A fronts would do it for you w/o mucking up bias, in a light car like yours that's very likely the most you would want to do.

[91133]

Fair points, Bill.

Looking at a 4 wheel replacement (with appropriate master cylinder) so anticipated balance would be less of an issue and certainly compensable with valving (which we can model on the computer).

"Better" is in terms of track days 5 or 6 times a year. Road performance is less critical and running softer pads off the track.

[Flieger]

Road performance is probably more critical if you ask me- as in you don't know when you might have to make a sudden stop in the rain. On the track things are usually much more predictable.

[Bill Verburg]

Originally Posted by 91133

Fair points, Bill.

Looking at a 4 wheel replacement (with appropriate master cylinder) so anticipated balance would be less of an issue and certainly compensable with valving (which we can model on the computer).

"Better" is in terms of track days 5 or 6 times a year. Road performance is less critical and running softer pads off the track.

Let me further point out that brakes stop the tire but the tire stops the car.

It seems to me that unless you have some special situation that I've ever run into that a '73 just doesn't need much if any brake upgrades.

I've never seen one that needed more than wide As in the front

The Boxster upgrades use the same 3.2 Carrera rotors that the wide A's use so yes, you get a torque upgrade but that isn't really needed or usable over and above what the stock brakes provide.

BBK's are desirable in 2 cases
1) where stock brakes experience temperature rises that can not be controlled otherwise

2) where bigger stickier rubber is utilized that can transfer the increased torque effectively to the pavement