NASCAR to Use Restrictor Plates In July’s XFINITY Race at Indianapolis

Action During the Lilly Diabetes 250

INDIANAPOLIS – NASCAR has confirmed reports that they will use restrictor plates for July’s XFINITY Series race at the Indianapolis Motor Speedway. The series announced the move on Thursday mornig.

Also among those reports, are that if things go well enough for the XFINITY Series’ Lilly Diabetes 250 this year, that they will use the restrictor plates at the Brickyard 400 in 2018. 

Futhermore, NASCAR if things go well at Indianapolis, NASCAR is looking at Pocono Raceway and Michigan International Speedway to using the restrictor plates on as well.

Currently, only the races at the Daytona International Speedway and the Talladega Superspeedway are the lone two tracks where restrictor plates are used. NASCAR is hoping that adding plates to Indy this July will make it easier to bunch the field up and making passing more of a premium.

At Indy, cars get strung out and passing is difficult. That’s part of the reason to why attendance has dropped drastically every year since 2008. Indy wasn’t built in 1909 with stock cars in mind. That’s why passing is very few and far between at Indy on the NASCAR side.

July’s heat of the day, lack of passing and a tire debacle in 2008 led to a sharp decline at the gates, so a new approach with restrictor plates will hopefully work. If not, the road course option will next be on the table.

They’re hoping to get things squared around. Restrictor plates, road course etc. IMS and NASCAR are trying to create passing in someway shape of fashion.

Designed specifically for the 100-lap race scheduled for July 22, the modifications consist of a taller rear spoiler and splitter package; aero ducts on the lower front bumper area; and a 7/8th-inch restrictor plate currently used for superspeedway events at Daytona International Speedway and Talladega Superspeedway.

The static ride height of the cars will remain at 4 inches, which is unchanged from the current 2017 rules package.

The Indy package was crafted after much in-house simulation and development and then field-tested on Oct. 12 at IMS for verification. XFINITY Series teams from Richard Childress Racing, Roush Fenway Racing and Kaulig Racing participated in the test.

“We (develop) the analytical package and come to some conclusions,” Gene Stefanyshyn, NASCAR Senior Vice President, Innovation and Racing Development, told NASCAR.com. “But then we also need to go on the track and verify this. So this approach has been a two-step approach, analytical creation of the package and then on-track verification.

“We race at 29 tracks (across all three national series) and they’re all very special,” Stefanyshyn added. “Indianapolis has a long history; it’s a wonderful track. Our objective is to give our fans the best possible show we can. We are very proud of being able to participate at Indy; we want to put our best foot forward. We believe we have come up with a package that gives us the best opportunity to do that.”

Stefanyshyn said officials had teams run various packages during the test. While the use of the restrictor plates enabled the cars to run closer together, the ability to pull out and pass remained difficult.

“We saw the cars were closer together, but we weren’t able to create some passing until we introduced the aero ducts,” he said. “That’s the main purpose of the ducts, to give the trailing car more of an advantage … we always hear about clean air and how the leader has clean air. Our objective here is to try to give the trail car more benefit.”

Without the aero ducts, cars running down long straightaways such as those at IMS hit a wall of air, which creates “a significant horsepower deficit” when they get within approximately one car-length of the lead car, Stefanyshyn said.

The aero ducts direct air in through the existing brake ducts and out through the wheelhouse on each side. The high speed air flowing out creates a larger hole or “envelope” for the trailing car.

Use of the aero ducts should increase the amount of horsepower differential for the trailing car by approximately 25 percent.

“We’re giving the driver more momentum from four-five car lengths back, gaining coming into within half a car length; when he gets right into that bubble, he’s still got to cross through it, but he’s carrying momentum and he can break through it,” Stefanyshyn said.

Stefanyshyn said incorporation of the package isn’t “a slam dunk,” but studies and testing have thus far validated the changes.

“Our belief is that we will create a situation where they can pass on the straightaways,” he said. “That’s been done analytically, it’s been done with three cars. The question is when we turn 40 cars loose on the track can that still manifest itself and that’s still what we’re hoping will happen.”

Speeds likely won’t vary greatly with the new package, and the use of restrictor plates isn’t expected to generate the big packs of traffic on the track similar to what typically is seen at Daytona and Talladega. Stefanyshyn said it’s more likely that there will be several groups of five or six cars each, “and in each of those groupings we’re hoping to see passing on the straightaways.”

The XFINITY Series has competed at IMS since 2012, and the lack of passing on the big, flat track has been a concern for NASCAR and speedway officials. Kyle Busch (Joe Gibbs Racing) led more than half the laps in winning the last two XFINITY Series races at Indy and he led 92 of 100 when he won the race in 2013.

Dale Earnhardt Jr. addressed the racing package this week during his weekly Dale Jr. Download podcast. Earnhardt Jr. competes in the Monster Energy NASCAR Cup Series for Hendrick Motorsports. He is also co-owner of JR Motorsports, which fields four full-time teams in the XFINITY Series.

“I’m curious to see (the changes),” he said. “I think NASCAR sees this as an idea on how fix racing in general at Indianapolis.”

According to NASCAR officials, there currently are no plans in place to utilize the package at any other venue or in the Monster Energy NASCAR Cup Series.

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One Thought to “NASCAR to Use Restrictor Plates In July’s XFINITY Race at Indianapolis

  1. NOOOOOOOOOOO0000oooooooo….Restrictor plates have ruined Cup Racing already at Daytona and Talladega, please don’t kill it at Indy too. Stop letting Cup Drivers run in the Xfinity series and you will have some close racing again.

    FACT: Restrictor Plate Racing has caused more Wrecks than there ever was before Allison’s wreck in 1987…it was a “Knee-Jerk” move in the 1st place, and Today with all the new safety additions to the Tracks and on the cars (front splitter, roof flaps, the side tail spoiler) the cars don’t get airborne like they used too, so the fans are not in nearly as much danger as they used to be.
    @NASCAR, you might not personally talk to the FANS, but I do, the reason you are seeing so many empty seats in the stands is because you are “MAKING/CHANGING SO DAM MANY RULES, IT TAKES THE FUN OUT OF WATCHING THE RACES”.

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