Okay, since I got tapped to work on the new rules for TT classes, I've got the rules before everyone else.
These
are not official, but it looks like Northwest and Reno Region is going to approve them shortly, and then they'll be sent off to nationals for their stamp of approval. They're significantly different than last years rules, so take a look:
Quote:
Sports Car Club of America
NORPAC Division
Club Trials / Time Trials Production Classes Rev 1.1.3
Purpose: The purpose of the Time Trials Production (TT) classes is to provide a simplified method for classifying cars for Club and Time Trials competition. These classes are intended for, but not limited to, vehicles that are normally classed in the Street Prepared, Street Touring, and Street Modified Solo classes.
It is assumed that cars competing in the Time Trials Production classes are prepared beyond the Showroom Stock classes, but not to the specifications of the Club Racing classes defined in the GCR. It is also assumed that Time Trials classed cars will have similarly prepared suspension and brakes, making considerations for such modifications unnecessary for classification purposes. Finally, it is understood that these classifications are new and based on limited data and experience, and will therefore be inappropriate in some cases. In such cases, the event officials are given the authority to make changes with regards to an individual’s car classification in the interest of balanced competition. Any changes to an individual’s car classification will be documented by the event officials with the reasons for the change and sent to the Time Trials Divisional Program Manager and the SCCA Time Trials Administrative Council for review.
Cars Eligible: Commonly available production automobiles intended for street use, modified for Club Trials or Time Trials competition (original frame or unibody), and on DOT approved tires (street or R-compound). It is recommended that cars eligible for Showroom Stock participate in their stock class. Likewise cars prepared for SCCA Club Racing should participate in their GCR defined class. However, all production based cars are eligible for Time Trials Production classification.
Classification: Cars will be classed by the engine displacement (liters) of the vehicle and shall compete in their applicable Time Trials Production class listed below. A vehicle’s displacement is determined by the current (factory or modified) displacement multiplied by 1 + the sum of the appropriate modifiers (listed below) rounded to the nearest 0.1 liter to determine the final classification. Please note that more than one modifier can apply to one car, but each modifier can be applied only once. For weight calculations, the manufacturer’s specified curb weight of the vehicle will be used. Cars without complete factory interiors (this includes seat swaps) will subtract 200 pounds from their curb weight for calculation purposes.
Time Trials Production Classes
Class Minimum Displacement (liters) Maximum Displacement (liters)
TT-1 8.0 Unlimited
TT-2 5.5 7.9
TT-3 4.5 5.4
TT-4 3.5 4.4
TT-5 2.0 3.4
TT-6 0.0 1.9
Displacement Modifier Chart
Modifier Name Notes
-0.50 Diesel Applied to any vehicle that runs on diesel fuel.
2.00 Rotary Applied to any vehicle powered by a rotary motor.
0.80 Forced Induction Applied to any turbocharged or supercharged vehicle.
0.40 Altered Boost Applied to any vehicle running non-factory levels of boost (via boost controllers, wastegate modification, ECU reprogramming, other electronic engine management, blow off/pop off valve changes, pulleys, and/or porting/polishing of forced induction components). “Non-factory” boost is defined not only as peak boost changes, but boost curve changes as well. This includes normally aspirated cars that have added forced induction. Changes in boost levels as a result of modification to systems not directly related to boost control (i.e. changes to exhaust systems, intercoolers/after coolers, intake, etc.) are permitted without requiring the application of this multiplier.
0.15 Multi-valve Applied to any vehicle with three or more valves per cylinder.
0.15 Multi-cam Applied to any vehicle with two or more camshafts.
0.60 Variable Valve Timing Applied to any vehicle with variable valve timing (including but not limited to Honda VTEC, Toyota VVTi, Subaru AVCS, BMW Vanos, etc.)
1.00 Engine Swap Applied to any vehicle powered by a motor of different type or layout, or a motor from a different manufacturer than the original factory installed motor.
Variable Lightweight Applied to any vehicle with a factory curb weight less than 2700 lbs. Vehicles with partial interiors or seat swaps will subtract 200 lbs from their curb weight for use in calculating this modifier. Modifier is 0.002 for every pound under 2700.
For example: A 2800 lb car with the rear seats removed.
(2700 – (Modified Curb Weight)) * 0.001
(2700 – (2800 – 200)) * 0.001 = 0.10
Variable Heavyweight Applied to any vehicle with a factory curb weight greater than 3200 lbs. Vehicles with partial interiors or seat swaps will subtract 200 lbs from their curb weight for use in calculating this modifier. Modifier is 0.002 for every pound over 3200.
For example: A 3800 lb car with the rear seats removed.
(3200 – (Modified Curb Weight)) * 0.001
(3200 – (3800 – 200)) * 0.001 = -0.40
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It's a bit hard to read in the post. The .DOC file is attached, and includes a worksheet for calculating your class. In addition I wrote a nifty little scrip to help people out:
http://www.seccs.org/ttclass.php
I'd love some feedback, but please note, I probably can't change anything at this point without it going through committee review, so it's not likely things will change unless you find a glaring error.
And yes, STI's are in TT-2 with the Corvettes. It's where they belong.