"The Beast" perfectly fits the new GTL class except for the requirment that the rear tires be 25 x 13 x 16 size. The most I can put under my Sheridan Narrow kit is a 23.5 x 10.5 x 16. Surgery and more $$ would be necessary, but I'm talking with the PRC to see if the language can be amended to a "MAXIMUM" of versus a must be.
Here is an exerpt from the new class rules:
GT Limited (GTL) Class Rules
Overview/Purpose
The purpose of the GT Limited Class is to provide a cost-contained, competitive specification for 911 and 914 GT cars with modifications that are well beyond the scope of the existing Production and 911 Spec Classes. The intention is to contain costs via engine specifications and the designation of a series spec tire.
The goal of the engine specifications is allow a wide range of choices, yet discourage racers from exceeding 7,000 rpm. With the 7,000 rpm threshold, it is expected that engine service intervals (e.g., for replacement of rings and rod bearings) will be longer than those of race engines revving at higher levels. Thus ongoing operating costs should be lower. In addition, competitors can further reduce costs by the use of engines that run pump gas, rather than more expensive race gas. This choice can be made within the Class rules without creating and undue disadvantage related to engine power.
The 7,000 rpm threshold is achieved by restricting the available air supply via the use of stock throttle bodies and intake plenums. The available air supply is further limited due to restrictions in the exhaust headers. Racers are discouraged from exceeding 7000 rpm as the intake and exhaust air restrictions reduce power output above that level.
The specified tire is an affordable, long-lasting, professional racing slick bias ply tire that is readily available. The tire’s price is similar to that of DOT competition tires and far less than racing radial slick tires.
The GT Limited Class will be added to the existing GT Classes for the 2006 Porsche Racing Challenge Series. Competitors will race for class honors at each event, and there will also be a season-long championship competition.
The following rules provide specific requirements for this class—all other requirements are specified and/or referenced in the NASA Porsche Racing Challenge Series Rules, the NASA Club Codes and Regulations and/or the PCA Club Racing Rules.
Chassis Requirements:
1. The chassis must be a Porsche 911 or 914 chassis up to 1995. 993 and later chassis types are prohibited. The chassis must have the floor pan, rocker panel longitudinal frame members and front firewall. The front firewall can be modified for installation of a fuel cell and/or oil tank.
2. Minimum weight with driver is 2300lbs.
3. The chassis must meet all other requirements for GT-Class cars specified and/or referenced in the NASA Porsche Racing Challenge Series Rules.
Engine Requirements:
1. All engines must be normally aspirated and air-cooled.
2. The maximum engine size is 3.6 liters. Any displacement under 3.6 liters is allowed.
3. The engine case must be a Porsche factory part.
4. Engines may have a maximum of two valves per cylinder.
5. Engine management system is free (e.g., Stock Bosch Motronic, Motec, Haltech, EFI, Electromotive, etc.)
6. The intake manifold must be from a 1984-1995 911, and must be stock from the exit of the throttle body to the intake of the cylinder head. Throttle bodies must remain stock with the exception of those changes necessary to install an aftermarket throttle position switch necessitated by the choice of engine management system. Pre-throttle body intake design, fuel injection lines, fuel rails et cetera are free.
7. The maximum primary header tube size of 1.625” O.D. Mufflers are free as long as the engine noise meets the restrictions of the various tracks.
Required Tires:
Goodyear “Sports Car Special” Bias Ply Slicks:
Front Part Number: 1652 (23.5 x 10.5 x 16, R600 compound)
Rear Part Number: 1572 (25 x 13 x 16, R600 compound)
Transmission Requirements:
1. The transmission must be a Porsche factory component.
2. The gears must use synchros (i.e., “dog boxes” are not allowed).
3. Suspension Requirements:
4. Front suspension design use MacPherson struts.
5. Rear suspension must use a factory trailing arms.
Anyone want to join me next year? Come on Trekkor....you know you want a 3.6!
The power steering rack in the 914 has been fitted. It is very trick. The car is still in pieces...but close to dry assembly. With luck we will go to paint in October and have it assembled by Christmas....
yeah...right...
Bill P.
I can't even keep up my yard much less do renovation.