T1 LP Aero adjustments
#30196 from Touring Committee · Rule change · TB 21-03 (2021-03 Fastrack)
In GCR Section 9.1.9.1., Limited T1, change as follows:
"See Limited Preparation (LP) T1 specification lines for the list of cars permitted to run in T1 in a limited preparation level
configuration. These cars shall be prepared to the T2 level of preparation found in 9.1.9.2. with the following additional
allowances:Aftermarket headers allowed. Limited prep cars running stock OEM manifold/headers as delivered may subtract50lbs. from the specified weight.
In addition to T2 specifications all T1-LP cars are permitted to:
1. Relocate the battery
2. Use any commercially available battery.
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3. Replace any suspension bushing with spherical joints.
4. Use any spring and/or sway bar rate, configuration must remain OE. Ferrous springs and sway bars only.
5. Hoods, trunk lids, and front fenders may be replaced with panels of any type material, provided that the panel maintains the
OEM profiles.
6. Aftermarket headers allowed.
7. Weight and Aerodynamic Devices
a. Any limited prep car not using a wing and/or splitter may subtract 100lb.
b. Aerodynamic devices conforming to 9.1.9.1.B.1 and 9.1.9.1.B.2 are permitted.
8. All vehicles must use a stock, OEM equivalent, safety glass, or 6 mm minimum thickness Lexan replacement, mounted in the
stock location, at the stock angle and maintaining the stock profile.
9. Engine durability allowances-
a) Rods and pistons may be replaced with aftermarket alternatives provided; 1)that the weight of the replacement is equal to or
greater than OE. 2) The bore, stroke, and displacement conform to T2 rules (9.1.9.2.D.1.e.1) 3)alternative pistons maintain OE
profile.
b) Valves may be replaced with aftermarket alternatives provided; 1)that the weight of the replacement is equal to or greater
than OE. 2) they are the same size and profile as OE.
c) Valve springs may be replaced with aftermarket alternatives provided they are the same configuration and size as OE +/-.015".
10. Driveshaft and half-shafts may be aftermarket, but shall be the OEM-type and use the same types of materials as stock. Drive
shafts may be replaced by one piece drive shafts, and conversely."