My engineering sources says that maximum braking occurs when there is a
20% slippage rate. Ie, if the tires are spinning at 100 mph then best
braking occurs at 80 mph apparent speed. All the way to near zero
speed... Ditto for acceleration. Best grip on the surface comes at that
amount of slippage. There is another factor involved as well, but we'll
save that for a later day...
mayf
______________________________
drmayf
Worlds Fastest Sunbeam, period.
204.913 mph flying mile
210.779 mph exit speed
On 6/21/2013 9:05 AM, Sandy Ganz wrote:
> I would not gauge ability to lock the brake as an indicator for good brakes at
> all. I have done the Wilwood conversion on my 65' Mustang and prior to it,
> it could lock the stock 'Drum' front brakes instantly. I also had a 66 K-Code
> Mustang with Disc brakes with similar action. After the swap on the drum brake
> car with 13" rotors and larger calipers, it felt like I could stop in half the
> distance and do it in a more controlled manner (yes, tires were different). I
> will comment also on the ability to modulate the larger brakes and it also
> helps
> the stopping distance and control vs. just locking the brakes up. I
> can't
> remember if the Tiger caliper is floating or not, but fix mount
> calipers also
> provide better and less mushy feedback to the pedal, someone
> also mentioned
> this, and it's my findings too. I also do not believe that a
> locked up tire has
> the maximum traction, and I think this is where better
> brake control comes into
> play to shorten the stopping distance. Tires are
> very important to the equation,
> but it's a system of components and it's all
> important from the rubber to the
> brakes and suspension.
>
>
> One thing to watch
> out for on some of the 'Brake Upgrades' is the replacement of
> a good sized
> caliper and brake sweep area with one that is much less. Wilwood
> has a bunch
> of kits for larger cars that replace, for example, a single piston
> GM caliper
> with huge pad surface area with one that is tiny (Like many kits that
> use the
> Dynalite caliper). This is typically not a good 'upgrade'. For cars like
> the
> tiger with it's tiny wheels and solid disk rotor the smaller calipers (like
> Dynalites) are likely fine (bigger tire/rim and bigger VENTED rotor is
> better).
>
>
> Again if you use your Tiger to just put around town, not much
> reason to mess
> with it, if you are a 'spirited driver' you can do much better
> with the brakes.
> My Tiger has the stock breaks and they are not in great
> shape due to age but
> they work fine for a trip to the store. Would not want
> to ever get them on the
> track in the state they are in.
>
> Some early morning
> ramblings
>
> Sandy
>
>
>
>
> ________________________________
> From: Owain Lloyd
> <owain.lloyd@gmail.com>
> To: Robert D. Hogan <robertdhogan@gmail.com>
> Cc:
> "tigers@autox.team.net" <tigers@autox.team.net>
> Sent: Thu, June 20, 2013
> 5:40:55 PM
> Subject: Re: [Tigers] FW: OEM vs Wilwood brake performance
>
> I'm
> sure someone mentioned this in this discussion but the point of 'big
> brakes'
> is not to stop quicker but to stop more times without brake fade
> due to heat.
> The vast majority of road drivers would never experience
> this as there are not
> many roads around that can accommodate such
> aggressive driving outside of
> competition.
>
> Since you can easily lock the front wheels with stock brakes
> (even with
> 245 toyo r888s), bigger brakes won't help you stop quicker.
>
> The
> biggest factor in the stopping that you can control is the size and
> compound
> of the tires.
>
> On Thursday, June 20, 2013, Robert D. Hogan wrote:
>
>> FYI
>>
>>
>>
>> From: Wilwood Customer Reply [mailto:customerreply@wilwood.com<javascript:;>
>> ]
>> Sent: Thursday, June 20, 2013 6:37 PM
>> To: 'Robert D. Hogan'
>> Subject:
> RE: OEM vs Wilwood brake performance
>>
>>
>> Thank you for the inquiry with
> Wilwood Disc Brakes. Wilwood did not
>> directly
>> test the stopping distance
> on the Sunbeam Tiger, we do not have that data.
>>
>>
>> Regards,
>> Wilwood
> Disc Brakes
>>
>>
>> From: Robert D. Hogan [mailto:robertdhogan@gmail.com
> <javascript:;>]
>> Sent: Wednesday, June 19, 2013 9:26 PM
>> To:
> customerreply@wilwood.com <javascript:;>
>> Subject: OEM vs Wilwood brake
> performance
>>
>>
>> Does Wilwood have any comparable stopping distance
> information of a Sunbeam
>> Tiger OEM stock disc/drum brake system performance
> and the Wilwood brake
>> kit
>> performance?
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