I have not read that a torque arm or traction master kit was used on the rear
suspension. Paragraphs following the braking performance indicate higher rate
front springs and Dalebs Restorations thicker rear springs were later
elected to improve on track performance.
In doing a cursory internet search, the complexity of the braking performance
questions are revealed regarding decision lag time, braking g levels and other
variables in quoted performance. Certainly the Car & Driver, Road & Track and
Motor Trend magazinesb tested braking performance figures must have a
standard for correlation. One internet blog description provided the
following data:
Some 60-0 braking times in a past issue of Road & Track (April 2013). If you
are thinking of some particular cars I could look them up for you if they're
in there.
Here are a few popular models:
Subaru Impreza WRX STi Limited 119'
Volkswagen Golf R 130'
Toyota Prius C 128'
Subaru BRZ Premium 128'
Mitsubishi Lancer EVO GSR 123'
Mini Cooper S 119'
Mazda 3i Touring 135'
Kia Optima Turbo 135'
Ferrari 458 Italia 106'
Corvette ZR1 105'
BMW 328i Sedan 123'
Chrysler 300S 129'
June 2013 Motor Trend:
Dodge Viper 94'
Ibve directed my question of comparable results directly to Wilwood
Engineering:
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?
A Classic Motorsports article on a Sunbeam Tiger referred to the improved
stopping distance of the project Tiger as 160 feet from 60 to 0 mph after
installation of the Wilwood Engineering brake kit. The 160 foot stopping
distance would seem to be an abysmal number in comparison to most compact
sedans' current 115 to 125 foot stopping distances.
From: MWood24020@aol.com [mailto:MWood24020@aol.com]
Sent: Wednesday, June 19, 2013 11:51 PM
To: robertdhogan@gmail.com; tigers@autox.team.net
Subject: Re: [Tigers] Stopping Distance
Not a tire issue, then, as the Z1 Star Spec was right at the top of ultra high
performance street tire category (since replaced with the Z2, which is even
better).
The next thing I think about is suspension geometry, wheel rates and
anti-dive...I forget what Tim did with that car, did it also have a torque
arm? ;-)
In a message dated 6/19/2013 8:17:07 P.M. Pacific Daylight Time,
robertdhogan@gmail.com writes:
In a later article (#12 of the Flying Tiger by Tim Suddard) on Strengthening
and Upgrading Our sunbeam Tigerbs Chassis, the author refers to using
195/55R15 Dunlop Direzza Sport Z1 Star Spec tires. Whether those were the
same tires quoted as stopping in 160 feet (nee the 150 of expected
improvements with biasing) is to be determined. These tires would seemingly
not be accountable for such poor stopping performance unless I error in the
assumption of a compound not within the extreme of highest mileage and low
adhesion.
Rob
From: MWood24020@aol.com [mailto:MWood24020@aol.com]
Sent: Wednesday, June 19, 2013 10:54 PM
To: robertdhogan@gmail.com; tigers@autox.team.net
Subject: Re: [Tigers] Stopping Distance
I think you hit on the key: tires. Whether oem front caliper/rotor or
aftermarket, generating enough clamping force to exceed mechanical grip is not
a problem. I would guess the kit used included a proportioning valve, to allow
better balance, and perhaps had better modulation which is where any
improvement in stopping distance likely was found.
In a message dated 6/19/2013 7:43:02 P.M. Pacific Daylight Time,
robertdhogan@gmail.com writes:
In the process of scanning some Classic Motorsports articles on a Tiger
restoration, I noticed the author referring to the improved stopping
distance of the project Tiger as 150 feet from 60 to 0 mph after
installation of the Wilwood Engineering brake kit. Even the 124 foot 60-0
stopping distance of a heavier Nissan Sentra in a Motor trend test, as the
worst in its class, performs better than the quoted Tiger result.
I have yet to research the details or what tires, temperatures, surface
conditions or measurement accuracies were involved in the article's number.
Could anyone shed some light on whether Tiger stopping distance data exists
elsewhere in the plethora of recorded Tiger documents? The importance is
that a $1200+ Wilwood front brake kit addition hardly seems worthwhile if
the stopping performance isn't more remarkably improved than hauling a 2560
Lb. SunbeamTiger down from 60 mph in under 120 feet much less 150.
Rob
..1560
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