Gap is the driver's best lap in a session against the fastest lap in their class in that same session (zero is fastest in class), shown as time lost and as a share of the lap, so conditions cancel out and tracks can be compared. Typical is the median session.
In STU Spec Lines, Table B: Alternate Vehicle and Engine Allowances, STU-GT3U, change Notes as follows: "All GT3U (Majors and Runoffs) cars using up to 15”x7” wheels limited to 225 section width tires shall run at current GT3 race weight plus 275lbs. All Gt3U cars shall run a DOT approved tire with a maximum section width of 245. GT3U cars are allowed optional 15”x9” wheels with a 1.5% weight addition or up to 18”x9” wheels with a 3.0% weight addition to the total weight including the 275 lbs Increase the minimum weight of all GT3/GT3U 2.0 liter unrestricted engines to +75 lbs. All GT3 cars running in STU must meet the minimum ride height of 3.0” for the main frame rails not including rub blocks and a 2” minimum for the front spoiler and splitter. 1. Wheel and tire requirements for GT3U
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a. Cars using up to 15”x7” wheels and up to a 225 section width DOT approved tires shall run at current GT3 race weight plus 275lbs. b. Cars using 15”x9” wheels and 245 section width DOT approved tires shall run at current GT3 race weight plus 275 lbs plus 1.5%. c. Cars using 16, 17, 18” x9” wheels and 245 section width DOT approved tires shall run at current GT3 race weight plus 275 lbs plus 3.0%. 2. The minimum weight of all GT3/GT3U 2.0 liter unrestricted engines plus 275lbs, plus 75lbs. 3. All GT3 cars running in STU must meet the minimum ride height of 3.0” for the main frame rails not including rub blocks and a 2” minimum for the front spoiler and splitter."
A specification table follows in the original; it is not shown here.
T2/T3/T4 Removal of Steering Wheel Locks Not Required in Touring
Thank you for your letter. In many modern Touring cars, deactivating the steering wheel lock isn't as easy as it was in the old days. Many cars will have electronic safety systems that will not allow the car to operate unless all parts of the steering wheel lock operates exactly as designed. Naturally, there is nothing preventing you from deactivating your own. Given the redundant safety features in many modern cars, we feel that the risk of failure is very low.
In GCR Section 9.1.9.2.D.7. Wheels and Tires, change as follows: "a. Wheels 1. Any type wheel suitable for competition may be used, provided: a. Any wheel not exceeding the specified diameter and rim width on the vehicle’s specification line may be used. Each wheel, measured without weights, must weigh at least 15 lbs. b. Wheels are permitted any offset provided the tire tread (that portion of the tire that contacts the ground) does not protrude beyond the fender opening when viewed from 9.1.9.2.Touring (T2-T4) Category Specifications GCR - 660 the top perpendicular to the ground, unless specified differently on the individual spec line for that car. To determine compliance the vehicle should be
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rolled through a powdered substance, as raced with driver, in order to indicate the tire tread contact patch under static conditions. When a maximum tire size is listed on a vehicle’s specification line, aspect ratio is open and any tire may be used that does not exceed the stated maximum section width. c. Cars equipped with lug bolts may convert to wheel studs and lug nuts. d. Wheel studs may be replaced with longer studs as necessary to fit optional wheels. Wheel spacers may be used for purposes of adjusting track. e-T4 only: (unless specified on spec line) Any aftermarket wheel with a minimum weight of 15 lbs allowed."