two piece rotor in ST

PaddyMcP · Post by **PaddyMcP** » Mon Oct 31, 2005 6:55 pm

Is a two piece rotor legal in ST if the rotor disk is cast iron and the hat is aluminum?

Quote from the rule book:

F. Brake rotors/drums of any origin may be used, provided they are ferrous (e.g. cast iron) and fit without modification to the caliper, caliper location, or wheel hub.

-Paddy

SSNH · Post by **SSNH** » Mon Oct 31, 2005 10:15 pm

would you still be meeting x.3.e?

Updating and backdating of braking system is allowed within the same manufacturer as long as it is completely bolt-on without adapter plates or brackets. Brake pad/lining material is unrestricted. Brake lines may be replaced with steel or Teflon lined metal braided hose.

PaddyMcP · Post by **PaddyMcP** » Mon Oct 31, 2005 11:17 pm

the rest of the braking system would be legal under that rule ^

The rotor obviously wouldn't be oem. But it would work with an oem caliper.

therooster · Post by **therooster** » Tue Nov 01, 2005 6:24 pm

Unless you car came stock with a two piece rotor, or you can mount a two piece rotor from another car manufactured by Suburu without any custom brackets, it is illegal to mount a two piece rotor in ST.

PaddyMcP · Post by **PaddyMcP** » Tue Nov 01, 2005 11:25 pm

i guess i'm interpreting the rule a little differently... has this been covered before with the chief of tech rooster?

rajito · Post by **rajito** » Wed Nov 02, 2005 12:40 am

therooster wrote:Unless you car came stock with a two piece rotor, or you can mount a two piece rotor from another car manufactured by Suburu without any custom brackets, it is illegal to mount a two piece rotor in ST.

I'm curious why you state this. The rule that Paddy quoted doesn't seem to forbid cast iron two piece rotors, especially when it replaces the stock rotor and doesn't require any modifications to the caliper or hub.

Raj

Post by **Mick** » Wed Nov 02, 2005 9:57 am

I agree, it sounds legal to me.

SSNH · Post by **SSNH** » Wed Nov 02, 2005 10:26 am

i would say 'no'... it is not a 100% steel rotor.

my opinion doesn't carry any weight though.

vendor?

PaddyMcP · Post by **PaddyMcP** » Wed Nov 02, 2005 3:32 pm

i think substituting a heavy iron rotor with a lightweight ceramic rotor is what they were trying to make illegal. if you switch to a two piece rotor where the rotor disk is still iron it is legal.

thanks for the input guys.

SSNH · Post by **SSNH** » Wed Nov 02, 2005 5:24 pm

PaddyMcP wrote:i think substituting a heavy iron rotor with a lightweight ceramic rotor is what they were trying to make illegal. if you switch to a two piece rotor where the rotor disk is still iron it is legal.

thanks for the input guys.

your reason for doing it? cost? braking performance? weight savings? bling?

therooster · Post by **therooster** » Wed Nov 02, 2005 6:15 pm

"F. Brake rotors/drums of any origin may be used, provided they are ferrous (e.g. cast iron) and fit without modification to the caliper, caliper location, or wheel hub. "

This part of the rule book was put in to allow non-OEM sourced parts. Look back to the 2003 or 2004 rules and you will not see this rule. Prior to this we required OEM replacement parts (ie dealer) which would have technically made your favorite auto parts dealers stuff illegal. We knew everyone was doing it so we a change to allow aftermarket replacements.

I do not remember any discussions about allowing a seperate hat and rotor, which would also technically modify how the rotor was attached to the hub.

Chris A.[/b]

PaddyMcP · Post by **PaddyMcP** » Wed Nov 02, 2005 10:55 pm

reason for doing it in general:

braking performance, more specifically heat dissipation for better performance at the end of a 20-30min session. It wouldn't be a dramatic increase in wieght savings, althought it may save some. It definatly would not save as much as going to a full ceramic rotor.

Reason for me doing it specifically:
i'm switching calipers/rotors next season and want to get the safest, best brakes possible for the class/car.

In repsonse to Chris' last comment:

It wouldn't modify the
1. hubs
2. caliper
3. caliper location

the more i think about this, the more it seems legal according to the current rule.

therooster · Post by **therooster** » Thu Nov 03, 2005 6:13 pm

I am saying that you are adding a piece (the alum. hat) that is not originally part of the system. You are thus modifing how the rotor is attached to the hub. Look at Section E, which states no adapter plates or brackets. Can you mount the rotor without the hat? (sarcacism) Obviously no.

I hate to start having to put the intent of every rule in the book but...

Chris

SSNH · Post by **SSNH** » Fri Nov 04, 2005 5:08 pm

lexan wheels are legal, right?

HerbD · Post by **HerbD** » Wed Nov 16, 2005 12:18 pm

PaddyMcP wrote:Is a two piece rotor legal in ST if the rotor disk is cast iron and the hat is aluminum?

Quote from the rule book:

F. Brake rotors/drums of any origin may be used, provided they are ferrous (e.g. cast iron) and fit without modification to the caliper, caliper location, or wheel hub.

-Paddy

Two-piece rotors are legal if the rotor is all cast iron.
The spirit of this rule change last year was to allow *cheaper*
aftermarket rotors to be used (i.e. not have to buy them at the dealer),
and specifically to prohibit expensive/exotic (i.e.lighter) rotor material.

COM Sports Car Club

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