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Restrictor-plate changes to tackle drafting

NASCAR has changed the technical specification of the cars for the restrictor-plate Chase race at Talladega, in an apparent move to lesson the amount of two-car drafting.
NASCAR has announced changes to the technical specification of cars for the restrictor-plate race at Talladega Superspeedway in October, which may lesson the domination of two-car drafting seen on the track.

The restrictor plate that teams have to use to lessen engine horsepower and reduce topline speeds on safety grounds to under 200mph are being enlarged by 1/64th of an inch to 57/64ths of an inch in diameter, which will slightly increase the engine's power by around 10 horsepower (resulting in an extra 2-3mph speed) but leave it slightly more prone to heating issues.

In addition, the pressure relief valve on the cars' cooling systems will be changed so that they come into play at a slightly lower water temperature steam pressure. That means the cars will now need to take more frequent breaks when running in two-car drafts.

Races at Talladega and Daytona earlier this season showed that cars with the old settings could run in a two-car tandem for a relatively extended period. The new settings should mean that the car doing the pushing will start to overheat quicker than before and will need to break the draft or switch to the front position more often.

"The new rule on the pressure release valves at superspeedways is just going to limit the time that you can push nose-to-tail," said Martin Truex Jr.'s crew chief Chad Johnston. "It's going to make you switch more often, which could be a good thing or it could be a bad thing. The chances of something going wrong on a swap are going to go up obviously, but hopefully it will eliminate or lessen the two-by-two racing."

"After the last few superspeedway races, we've heard many drivers express their desire to open up the size of the restrictor plate some and we thought the time was right to do that," said Robin Pemberton, NASCAR's vice president for competition.

Not everyone agrees that the changes will have the desired effect, and if speeds climb higher than anticipated than NASCAR may change the specifications at short notice during the race weekend on safety grounds as happened ahead of this year's Daytona 500, when speeds of over 200mph rang serious alarm bells for series organisers.

Few expect the changes to result in a return to the old style of two- and three-wide long-line drafts that has historically been the restrictor-plate style of racing until this year, and hooking up with a 'dance partner' for the race is still likely to be all-important.

Dale Earnhardt Jr. for one was critical of the new two-car drafting that arose in this year's restrictor-plate races. "I don't like this kind of racing," he said unequivocally after the second outing at Daytona in July. "What kind of move can you make in racing like this? There ain't no move you can make. You just hold it on the mat and try not to wreck into each other."

However, the changes certainly suited Hendrick Motorsports, which dominated Talladega and saw Jimmie Johnson claim his sole victory of the season so far.



Related Pictures

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Clint Bowyer and Michael Waltrip carrying out to-car drafting at Talladega. [Photo Credit: John Harrelson/Getty Images for NASCAR]
A restrictor plate used during the NASCAR Sprint Cup Series Preseason Thunder test from January 20-22, 2011 at Daytona International Speedway has 29/32-inch holes. [Photo Credit: Jared C. Tilton/Getty Images for NASCAR]
Martin Truex Jr., driver of the #78 Furniture Row/Visser Precision Chevrolet, leads a pack of cars during the NASCAR Sprint Cup Series Coca-Cola 600 at Charlotte Motor Speedway on May 24, 2015 in Charlotte, North Carolina.  (Photo Credit: Streeter Lecka/Getty Images)
Jimmie Johnson, driver of the #48 Lowe`s Patriotic Chevrolet, is involved in an on-track incident during the NASCAR Sprint Cup Series Coca-Cola 600 at Charlotte Motor Speedway on May 24, 2015 in Charlotte, North Carolina.  (Photo Credit: Streeter Lecka/Getty Images)
Martin Truex Jr., driver of the #78 Furniture Row/Visser Precision Chevrolet, Kevin Harvick, driver of the #4 Budweiser/Jimmy John`s Chevrolet, and Denny Hamlin, driver of the #11 FedEx Office Toyota, lead the field into turn one during the NASCAR Sprint Cup Series Coca-Cola 600 at Charlotte Motor Speedway on May 24, 2015 in Charlotte, North Carolina. (Photo Credit: Rainier Ehrhardt/Getty Images)
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Martin Truex, Jr, driver of the #78 Furniture Row/Visser Precision Chevrolet SS, stops in his pit on his way to a fifth place finish, Sunday, May 24, 2015, in the NASCAR Sprint Cup race at Charlotte Motor Speedway in Concord, North Carolina. (Photo by Andrew Coppley/HHP for Chevy Racing)
Dale Earnhardt, Jr., driver of the #88 Nationwide Chevrolet SS, finished in third place, Sunday, May 24, 2015, in the NASCAR Sprint Cup race at Charlotte Motor Speedway in Concord, North Carolina. (Photo by Alan Marler/HHP for Chevy Racing)
Austin Dillon, driver of the #33 Rheem Chevrolet, and Darrell Wallace Jr., driver of the #6 Cheez-It Ford, lead the field past the green flag to start the NASCAR XFINITY Series Hisense 300 at Charlotte Motor Speedway on May 23, 2015 in Charlotte, North Carolina.  (Photo Credit: Sarah Crabill/NASCAR via Getty Images)
Darrell Wallace Jr., driver of the #6 Cheez-It Ford, pits during the NASCAR XFINITY Series Hisense 300 at Charlotte Motor Speedway on May 23, 2015 in Charlotte, North Carolina.  (Photo Credit: Sarah Crabill/NASCAR via Getty Images)
Martin Truex, Jr., driver of the #78 Furniture Row/Visser PrecisionChevrolet SS, qualifies for tenth position, Thursday, May 21, 2015, for Sunday`s NASCAR Sprint Cup race at Charlotte Motor Speedway in Concord, North Carolina. Truex, Jr. is second in the NASCAR Sprint Cup Series (NSCS) standings. All 43 drivers will be participating in
Kevin Harvick, driver of the #4 Budweiser/Jimmy John’s Chevrolet SS, qualifies for eighth position, Thursday, May 21, 2015, for Sunday`s NASCAR Sprint Cup race at Charlotte Motor Speedway in Concord, North Carolina. Harvick leads the NASCAR Sprint Cup Series (NSCS) standings. All 43 drivers will be participating in
Jimmie Johnson, driver of the #48 Lowe`s Patriotic Chevrolet, sits in his car prior to practice for the NASCAR Sprint Cup Series Coca-Cola 600 at Charlotte Motor Speedway on May 21, 2015 in Charlotte, North Carolina. Johnson’s car features Army 1st Lt. Robert L. Henderson II as part of the 600 Miles of Rememberance.  (Photo Credit: Streeter Lecka/Getty Images)
Darrell Wallace Jr., driver of the #6 Ford EcoBoost Ford, leads a pack of cars during the NASCAR XFinity Series 3M 250 at Iowa Speedway on May 17, 2015 in Newton, Iowa.  (Photo Credit: Photo by Jeff Zelevansky/Getty Images)
Jimmie Johnson, driver of the #48 Lowe`s Chevrolet SS, races to victory Saturday night, May 9, 2015 in the NASCAR Sprint Cup race at Kansas Speedway in Kansas City, Kansas. Racing with him is Hendrick Motorsports teammate Dale Earnhardt, Jr., driver of the #88 Nationwide Chevrolet SS who finished in third place. (Photo by Harold Hinson/HHP for Chevy Racing)
Jimmie Johnson, driver of the #48 Lowe`s Chevrolet SS, celebrates his victory with a burnout Saturday night, May 9, 2015 winning the NASCAR Sprint Cup race at Kansas Speedway in Kansas City, Kansas. (Photo by Harold Hinson/HHP for Chevy Racing)
Jimmie Johnson, driver of the #48 Lowe`s Chevrolet SS, celebrates his victory Saturday night, May 9, 2015 winning the NASCAR Sprint Cup race at Kansas Speedway in Kansas City, Kansas. (Photo by Harold Hinson/HHP for Chevy Racing)
Jimmie Johnson, driver of the #48 Lowe`s Chevrolet SS, celebrates his victory Saturday night, May 9, 2015 winning the NASCAR Sprint Cup race at Kansas Speedway in Kansas City, Kansas. (Photo by Harold Hinson/HHP for Chevy Racing)

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