Balance of Performance set for Rolex 24

IMSA has released its Balance of Performance prior to next weekend’s season-opening Rolex 24 at Daytona, and there are significant adjustments.

This is expected to be the final Balance of Performance prior to the WeatherTech SportsCar Championship season opener,  and changes have been made in all four categories.

Here’s a rundown of the changes made since the initial 2016 BoP, which was used at the Roar Before the Rolex 24 earlier this month.

Prototype

*BR Engineering BR01 Nissan: 10kg weight reduction (890 to 880kg), confirmed fuel (76 liters) and refueling restrictor (33.0mm)

*DeltaWing DWC13 Coupe: 5kg weight increase (515 to 520kg), 0.19 reduction in boost ratio

*Ligier JS P2 Honda: 10kg weight increase (940 to 950kg), slight reduction in boost ratio at selected RPM levels

*Ford Riley DP: Slight reduction in top-end RPM boost ratio

*Lola B11/80 Mazda: Reduction (0.026-0.126) in boost ratio, 8-liter increase in fuel capacity and defined 33.0 mm refueling restrictor

*Dinan Riley DP: 2mm larger restrictor (74 to 76mm x 2) and 2-liter increase in fuel capacity (79 to 81 liters)

*Corvette DP: No changes

Prototype Challenge

*Revised rear wing position (P6 to P4), new minimum angle of -9.8 degrees and -19.8 degrees for the flap. IMSA will issue a specific bulletin describing the rear wing measurement

GT Le Mans

*BMW M6 GTLM: Reduction in boost ratios, larger Gurney (5 to 15mm), 9-liter increaase in fuel capacity (95 to 104 liters), 33.5mm refueling restrictor

*Corvette C7.R: 0.2 mm smaller air restrictor (30.1 to 29.9mm x2), 6-liter increase in fuel capacity (86 to 92 liters), 32mm refueling restrictor

*Ferrari 488 GTE: Slight reduction in boost ratios, confirmed 78 liters fuel capacity and 29.5mm refueling restrictor

*Ford GT: Reduction in boost ratios, 3-liter increase in fuel capacity (95 to 98 liters), 35mm refueling restrictor

*Porsche 911 RSR: 6 liter increase in fuel capacity (85 to 91 liters), 32mm refueling restrictor

GT Daytona

*Aston Martin V12 Vantage GT3: 10kg weight reduction (1260 to 1250kg), 1.3mm larger air restrictor (40.7 to 42mm x2 ), 13-liter increase in fuel capacity (90 to 103 liters)

*Audi R8 LMS ultra: 10kg weight reduction (1300 to 1290kg), 1.7mm larger air restrictor (52.3 to 54mm x2), 3-liter increase in fuel capacity increase (104 to 107 liters)

*Audi R8 LMS (new): 20kg weight increase (1280 to 1300kg), 2mm reduction in air restrictor (40 to 38mm x2), 4-liter increase in fuel capacity (86 to 90 liters)

*BMW M6 GT3: 10kg weight increase (1300 to 1310kg), reduction in boost ratios, 9-liter increase in fuel capacity (95 to 104 liters)

*Dodge Viper GT3-R: 20kg weight reduction (1340 to 1320kg), 1mm reduction in air restrictor (39 to 38mm x2), 4-liter increase in fuel capacity (103 to 107 liters)

*Ferrari 458 Italia GT3: 20kg weight reduction (1300 to 1280kg), 200 rpm reduction (8400 to 8200 rpm)

*Lamborghini Huracan GT3: 20kg weight increase (1260 to 1280kg), 2mm smaller air restrictor (39 to 37mm x2), 1 liter increase in fuel capacity (89 to 90 liters)

*Porsche 911 GT3 R: 1 liter reduction in fuel capacity (85 to 84 liters)

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Series IMSA
Article type Breaking news
Tags adjustments, balance of performance, daytona, rolex 24