Cal Club Autocross Forums

I hear the SP class rules may be changed to allow any aftermarket caliber/rotor combo.
A. Is this true?
B. Do they have to be the same diameter rotor or same # of pistons?
C. Anywhere I can read the change if coming?

ie Can I use a full race Stop Tech system:) My ABS does not like going from 235 to 285's on the front.

D. Oh yes......and can a car that does not come with Carbon rotors be change over:)


Thanks Steve

Replace 15.6 BRAKES with the following:
“Vehicles may only exceed the allowances of 13.6 as specified herein.
A. Any brake line, single or dual master cylinder, vacuum brake booster, or brake proportioning valves may be used. This does not allow multiple separate cylinders, but does allow for any single, dual-circuit cylinder.
B. “Safety brakers” and units such as the “Brake Guard System” are permitted.
C. ABS braking systems may be disabled, but not removed; brake boosters may be removed, modified, substituted, or added.
D. Alternate brake rotors are permitted, subject to the following restrictions:
1. Rotors must be ferrous metal except for standard parts. Aluminum rotor hats are allowed. Rotor dimensions (diameter and thickness) must be equal to or greater than standard parts. Cars originally equipped with solid (non-vented) rotors may utilize vented rotors.
2. Cross-drilled and/or slotted brake rotors may be used. Slots/holes are permitted only in the braking area of the rotor. Rotors featuring a drum-type parking brake in the hat area of the rotor may not be drilled or slotted in the parking brake area.
E. Drum brakes may be replaced with disc brakes. Disc brake rotors for such a conversion must be equal to or greater in diameter than the inside diameter of the standard brake drum. Changes to backing plates/mounting brackets/brake lines to accommodate this change are permitted but may serve no other purpose. Drum-to-discbrake conversions must be bolted, not welded to the axle/control arm/upright.
F. Air ducts may be fitted to the brakes, provided that no changes are made in the body/structure for their use. They may serve no other purpose. Backing plates and dirt shields may be modified or removed.
G. A functional, redundant emergency (parking) brake must be present.
H. Brake calipers may be replaced, provided the number of pistons is equal to or greater than the original number of pistons. Caliper mounting brackets may be replaced to accommodate this change, but may serve no other purpose. Alternate caliper brackets must bolt to the original caliper bracket mounting location(s).”
SCCA Fastrack News July 2008

http://www.scca.com/documents/Fastrack/ ... ck-oct.pdf" onclick="window.open(this.href);return false;
(pg 5)

Steve Eguina wrote: D. Oh yes......and can a car that does not come with Carbon rotors be change over:)

Update Backdate. ;)

Aaron Goldsmith wrote:

Steve Eguina wrote: D. Oh yes......and can a car that does not come with Carbon rotors be change over:)

Update Backdate. ;)

those aren't carbon. they're ceramic.

Marshall Grice wrote:

Aaron Goldsmith wrote:

Steve Eguina wrote: D. Oh yes......and can a car that does not come with Carbon rotors be change over:)

Update Backdate. ;)

those aren't carbon. they're ceramic.

Well the Ceramic discs are usually carbon reinforced. I figure that's what steve is actually referring to since full carbon carbon rotors would probably have trouble getting to operating temp in an autocross environment. (All of which you knew, you're just being picky. You must be board.)

Aaron Goldsmith wrote:You must be board.)

And bored, too. ;)

Don't the rules specify rotors of ferrous materials?

Bob Beamesderfer wrote:

Aaron Goldsmith wrote:You must be board.)

And bored, too. ;)

Don't the rules specify rotors of ferrous materials?

Unless standard equipment.

Aaron Goldsmith wrote:

Bob Beamesderfer wrote:

Aaron Goldsmith wrote:You must be board.)

And bored, too. ;)

Don't the rules specify rotors of ferrous materials?

Unless standard equipment.

Ah, of course.

Now if the McLaren SLR is on the same line as the SL65, it would only cost $60k to update the SL to the SLR's brakes.

Steve Eguina wrote: D. Oh yes......and can a car that does not come with Carbon rotors be change over:)


Thanks Steve

Cant even use those in SM. *unless OE.

Steve Eguina wrote: ie Can I use a full race Stop Tech system:) My ABS does not like going from 235 to 285's on the front.

Steve,

The rule was "freed up" on SP brakes and I think the proposal was in the July Fastrack. Pretty much any ferrous rotor dimensionally no smaller than stock and any caliper with no fewer than the stock number of pistons is allowed.

Unfortunately I'm not aware of any allowance to change your ABS computer or its programming, which is the likely source of that ABS problem with the 235s vs 285s. SP allows you to disable ABS in your car though, if that's any help.

Mike

Thanks Gang!

I can solve the problem by changing the caliber piston size and I'm looking at putting 15 inch rotors on the Porsche.....for those 160 mph AX's at Calif. Speedway:)

Thanks for the info. Steve