Porsche '73 993 GT class Racecar: Coil-over 930 Suspension

Potential is what it’s all about! Yours and the car. The traction patch, where the rubber meets the road, is the core focal point of using the racecar's full potential. In the final analysis, maximizing traction within that patch of less than a square foot is what you are attempting to do. Be it accelerating, braking or cornering, lap times are improved by becoming one with the traction patch. You get there via Suspension. That's why the 930 suspension has been added to the racecar, front and rear. This is optimal for the 911, especially with the fully adjustable rear trailing arms and spring plates. Rear alignment is just as critical as the front, hence the need for 4-wheel professional adjustment.

The 315x35x17 rears make quite a footprint, delivering the power to the traction patch. Cornering is done through these rears and the front 255x45x17. Hoosier R6 radial tires have been the staple for racing this machine. They provide stability, gobs of traction, and handle the temperatures well. They come up to temperature as fast as any, and do not get greasy under hard driving when taken care of. The next step would be to go to full slicks to see just how that might improve the racing experience. Certainly expect slicks would let you pull more G's in the corners. The use of full racing slicks just might reduce braking distance - if that were at all possible, and, they could allow you to scrub off less speed for cornering. Now that would enhance the thrills!

The coil-over springs have been carefully selected to match this specific racecar’s weight and its distribution over the chassis. Professional engineering pays off. No guess work. Having this spring-rate dialed in is made easier with the use of these. The setup also allows many other adjustments not available with the traditional Porsche torsion bars. This is one more example of the optimizing done to build a quality racecar.

Smart Racing adjustable sway bars complete the package. The strength is matched to the racecar weight. Easy and precise adjustment at each corner allows fine tuning of the well engineered suspension package.

The complexities and synergies of the suspension package have been carefully engineered. Locking it all together is the Hamlin full roll cage. It is tied into all four corners of the chassis for true and instant input and feedback. The high quality of the Hamlin reputation ensures safety because they know how it should be done, and they do it professionally. Many racers on the West coast rely on them.

Roll cage front tie-in points to chassis.

Getting to be one with this racecar comes easy. Sitting at the controls, snugly and comfortably in place, the instrument and seat-of-the-pants feedback are sharply feeding your brain the vital info you need to become one with the car. There are limited distractions to getting into the zone, where your input and control become subconscious, except for the most crucial and timely tasks. This racecar lets you get to this point quickly.

My 4th PCA Club race as a "Rookie", qualified 11th of 49 racers & 3rd in Class.


The Road America Challenge - Blue Sprint Qualifying
Pos	PIC	Car No.	Last Name	Class	Best Tm	Diff	In Lap	Description
8	1	117		GT3S	02:28.7	6.129	7	GT 67 911 S
9	4	11		GT4S	02:29.4	6.772	8	GT 74 911
10	2	58		GT3S	02:29.5	6.943	5	GT 71 911
11	3	168	QUICK	GT3S	02:30.2	7.652	5	GT 73 911
12	4	49		GT3S	02:30.3	7.725	3	GT 71 911
13	5	19		GT4S	02:30.6	8.037	9	GT 76 911 RSR
17	1	192		GTC1	02:31.7	9.138	1	GT 92 964 CUP
18	6	10		GT4S	02:31.9	9.294	6	GT 74 914-6
19	3	68		C	02:32.0	9.394	2	S 95 993 RS CS
20	4	993		C	02:32.0	9.431	2	S 96 993 TT

Overview:
. Complete 930 suspension, front and rear.
. Coil over springs, perfectly dialed in spring rates.
. Bilstein shocks
. Front & rear camber boxes for improved adjustment range.
. Smart Racing adjustable sway bars front and rear
. Hamlin Fabrication full roll cage.

PAGES of details/photos:

'73 993 GT Class

Coil-over 930 Suspension