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52nd Porsche Parade Autocross by Jim Cambron - Heart O' Dixie

52nd Porsche Parade Autocross by Jim Cambron - Heart O' Dixie

52nd Porsche Parade Autocross by Jim Cambron - Heart O' Dixie

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This PCR calculation allowed wheel widths up to 9.5” in the front and 11.0” in the rear with<br />

260mm and 290mm width tires. The intake, headers with performance catalysts and mufflers, in<br />

concert with the Sport-Chrono option yielded the greatest power increase IAW the PCR<br />

specified “bolt-on” components (I deferred reflashing the DME until post <strong>Parade</strong> when I have<br />

more miles on the car). The PASM and performance springs with strut bar produced the best<br />

Production Class suspension mods. The Club Sport shell seats reduced weight and when<br />

combined with the shoulder harness offered improved driver constraint and safety. All other<br />

vehicle options and improvements were for the visual effect necessary to win car show trophies.<br />

’07 Boxster S<br />

The completed Boxster certainly seemed to have winning potential with a calculated 354 hp<br />

(w/DME) and 2,850 lbs yielding a power-to-weight ratio surpassing the 997S <strong>by</strong> nearly 10%.<br />

Selecting Replacement <strong>Autocross</strong> Wheels and Tires<br />

After my crash, I sold my ’02 Boxster autocross wheels and tires to fellow Boxster-owner<br />

and club-member Paul Wright, so I needed a new set of wheels and tires. In the autocross,<br />

smaller wheel diameters weigh less and produce faster acceleration gearing. You want the<br />

smallest diameter wheel that will fit around your brakes plus the widest wheel (for the widest<br />

tire) that will fit under the fenders and not rub the suspension or fender liner. The PCCB brakes<br />

necessitated a minimum of 18” diameter wheels and my first thought was to use my GT3 18”<br />

Jong Bloed racing wheels. Their 12” width rear wheels with 335mm tires exceeded the PCR<br />

allowance, but the 8.5” front wheels with 235mm front tires were the right size.<br />

However, there were two problems with the use of the Jong Bloed front wheels on the<br />

Boxster: 1) the GT3 front wheel offset was greater than the Boxster, so the wheels would<br />

protrude past the fenders, 2) the wheels mounted Michelin Pilot Cup tires which are terrible at<br />

the autocross, worse than street tires. So, I needed another set of autocross wheels and tires and<br />

hopefully at a price less than the $5,800 invested in the Jong Bloeds and Michelin Cups.<br />

I use SSR wheels on the Miata and in their 7X15” size they only weigh 9lbs a piece and I<br />

really like the handling characteristics of the Kumho V710 autocross tires mounted on these<br />

4

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