International Motor Sports Association's (IMSA) president Scott Atherton confirmed the race was part of the schedule for the 2018 IMSA SportsCar Championship (IMSA SCC) in August 2017.[1] The race marked IMSA's return to Mid-Ohio Sports Car Course for the first time since 2013 as the track replaced Circuit of the Americas after the 2017 season.[2][3] The 2018 Acura Sports Car Challenge of Mid-Ohio was the fourth of twelve scheduled sports car races of 2018 by IMSA, and it was the second round not held as part of the North American Endurance Cup.[1] The race was held at the thirteen-turn 2.258 mi (3.634 km) Mid-Ohio Sports Car Course on May 6, 2018.[1] On April 11, 2018, Acura was announced as a title sponsor for the event.[4] On April 30, 2018, IMSA announced NBC Sports as its broadcasting partner from 2019 onwards.[5] Michael Shank Racing was renamed to Meyer Shank Racing following Jim Meyer becoming a co-owner of the team.[6]
On April 27, 2018, IMSA released the latest technical bulletin outlining Balance of Performance for the prototype class.[8] The Acura ARX-05, Mazda RT24-P, and Nissan Onroak DPi received less turbo boost. The Cadillac DPi-V.R received a 0.6 mm smaller air restrictor while the LMP2 cars didn't get any changes. In GTD, The BMW M6 GT3 received a 20 kilogram weight break and a fuel capacity reduction of 2 liters.[9]
There were three practice sessions preceding the start of the race on Saturday, two on Friday and one on Saturday. The first two one-hour sessions were on Friday morning and afternoon. The third on Saturday morning lasted an hour.[17]
Practice 1
The first practice session took place at 9:45 am ET on Friday and ended with Ricky Taylor topping the charts for AcuraTeam Penske, with a lap time of 1:13.601.[18]
The second practice session took place at 3:00 pm ET on Friday and ended with Juan Pablo Montoya topping the charts for AcuraTeam Penske, with a lap time of 1:36.867.[20]
The third and final practice session took place at 8:35 am ET on Saturday and ended with Dane Cameron topping the charts for AcuraTeam Penske, with a lap time of 1:12.675.[22]
Saturday afternoon's 65-minute qualifying session was divided into three groups.[17] All three categories had 15-minute individual sessions, and regulations stipulated teams to nominate a single driver to qualify their cars. The competitors' fastest lap times determined the starting order with the grid arranged to put the Prototype and GTLM cars ahead of all GTD entries.[24]
Qualifying results
Pole positions in each class are indicated in bold and by ‡.
1 The No. 33 Mercedes-AMG Team Riley Motorsport entry was moved to the back of the GTD field after the team elected to change tires after qualifying.
2 The No. 44 Magnus Racing entry was moved to the back of the GTD field after the team elected to change tires after qualifying.
3 The No. 75 SunEnergy1 Racing entry was moved to the back of the GTD field after the team elected to change tires after qualifying.
Race
Post-race
The result kept Albuquerque and Barbosa atop the Prototype Drivers' Championship with 119 points, 10 points ahead of second-place finishers Nasr and Curran. Hélio Castroneves and Ricky Taylor advanced from tenth to fourth while Bennett and Braun dropped from third to fifth.[27] The result kept Briscoe and Westbrook atop the GTLM Drivers' Championship with 121 points. Bamber and Vanthoor advanced from sixth to second.[27] The result kept Sellers and Snow atop the GTD Drivers' Championship with 95 points. Legge and Parente advanced from third to second.[27] Cadillac and Lamborghini continued to top their respective Manufacturers' Championships. Porsche took the lead of the GTLM Manufactures' Championship while Mustang Sampling Racing, Ford Chip Ganassi Racing, and Paul Miller Racing kept their respective advantages in the Teams' Championships with eight rounds remaining.[27]
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