(MARRS-RX7) Rotor question

johnnythegreek58 johnnythegreek58
Wed Mar 18 02:39:36 CET 2015


Parts of her still live on in my car Danny...

Your engine is sleeping in my garage still waiting to go in my 2nd specRx7.

Johnny The Greek#27
On Mar 17, 2015 8:13 PM, "DANNY MATULA via Spec7" <spec7 at specrx7.com> wrote:

> As for the blues fading on me it was prior to having the ducts on and my 7
> was a porky car until it went on weight reduction.  And I was working hard
> on my braking techniques that day. By the time I was at the school I don't
> think any of the spec miatas were braking as late as I could with the 7
> witch was a lot of fun .. damn I miss that car..
> On Mar 17, 2015 5:05 PM, "Matthew Stutt via Spec7" <spec7 at specrx7.com>
> wrote:
>
>>  More data points, please.  Does anyone else care to share their costs
>> for tires vs. brakes?
>>
>> It's been awhile since I raced one of these, but I think I was getting
>> 4-5 race weekends out of a set of tires.  IIRC, a set of tires was in the
>> ball park of $600 dollars after paying for shaving, mounting and balancing.
>>
>> Brake rotors would last me 3-4 weekends.  I did have the fancy Mazdacomp
>> backing plates and good ducting.  Pads would last marginally longer if I
>> really pushed it.  My target price for rotors was $20 or less.  Back in '07
>> it wasn't at all hard to hit that target.  I don't remember what pads cost
>> anymore, but I'm fairly confident a set of blues is ~$100.
>>
>> Perhaps the prices are changed, but the cost of brakes never struck me as
>> prohibitively expensive or otherwise out of whack.
>>
>> Some miscellaneous notes on brakes while I'm thinking about:
>>
>>    - Cryotreating makes no difference.  Tried it, same longevity.
>>    - Summit Point is very hard on brakes.  I suppose it's down to having
>>    two heavy braking zones so close together with little opportunity to cool
>>    the brakes between.
>>     - When you setup your cooling ducts, duct the air into the center of
>>    the rotor so it flows into the vanes of the vented rotor.  The backing
>>    plates sure do make this easy, but creative use of zip ties can get you
>>    close.
>>     - Bleed your brakes after every weekend.  Brake fluid is cheap, and
>>    this will ensure that you never have fade problems.
>>     - Regarding the above point, if you make a hawk blue fade you are
>>    doing something incredible.
>>    - The soft springs are a factor in why Spec7s are so hard on front
>>    brakes.  Lots of load transfer under braking.
>>
>>
>>
>>
>>
>>
>>
>> On 3/17/15 4:11 PM, johnnythegreek58 via Spec7 wrote:
>>
>> I know spec RX7 is a spec class to save money but like someone else said
>> "I spend more money on rotors then tires". Thats true for me as well.
>>
>>
>> --
>> --
>> M. Stutt
>>
>>
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>>
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