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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]
Kevin Harvick, driver of the #4 Budweiser/Jimmy John`s Chevrolet SS, finishes in eighth place Sunday, March 29, 2015 in the NASCAR Sprint Cup race at Martinsville Speedway in Ridgeway, Virginia. (Photo by Rusty Jarrett/HHP for Chevy Racing)
Martin Truex, Jr., driver of the #78 Furniture Row/Visser Precision Chevrolet SS, finishes in sixth place Sunday, March 29, 2015 in the NASCAR Sprint Cup race at Martinsville Speedway in Ridgeway, Virginia. (Photo by Andrew Coppley/HHP for Chevy Racing)
Paul Menard, driver of the #27 Pittsburgh Paints/Menards Chevrolet, Aric Almirola, driver of the #43 STP Ford, Greg Biffle, driver of the #16 Ortho Ford, Trevor Bayne, driver of the #6 AdvoCare Ford, and Jimmie Johnson, driver of the #48 Lowe`s Chevrolet, are involved in an on-track incident during the NASCAR Sprint Cup Series STP 500 at Martinsville Speedway on March 29, 2015 in Martinsville, Virginia.  (Photo Credit: Rob Carr/Getty Images)
Ricky Stenhouse Jr., driver of the #17 Fastenal Ford, is involved in an on-track incident during the NASCAR Sprint Cup Series STP 500 at Martinsville Speedway on March 29, 2015 in Martinsville, Virginia.  (Photo Credit: Jeff Zelevansky/NASCAR via Getty Images)
Martin Truex, Jr., driver of the #78 Furniture Row/Visser Precision Chevrolet SS, qualifies for third position Friday, March 27, 2015 for Sunday`s NASCAR Sprint Cup race at Martinsville Speedway in Ridgeway, Virginia. Truex, Jr. is third in the NASCAR Sprint Cup Series (NSCS) standings. (Photo by Andrew Coppley/HHP for Chevy Racing)
Jimmie Johnson, driver of the #48 Lowe’s Chevrolet SS, qualifies for fifth position Friday, March 27, 2015 for Sunday`s NASCAR Sprint Cup race at Martinsville Speedway in Ridgeway, Virginia. Johnson is seventh in the NASCAR Sprint Cup Series (NSCS) standings.(Photo by Alan Marler/HHP for Chevy Racing)
Martin Truex Jr., driver of the #78 Furniture Row/Visser Precision Chevrolet, stands in the garage area during practice for the NASCAR Sprint Cup Series STP 500 at Martinsville Speedway on March 27, 2015 in Martinsville, Virginia.  (Photo Credit: Rainier Ehrhardt/NASCAR via Getty Images)
Kevin Harvick, driver of the #4 Jimmy John`s/Budweiser Chevrolet, races during the NASCAR Sprint Cup Series Auto Club 400 at Auto Club Speedway on March 22, 2015 in Fontana, California. (Photo Credit: Jerry Markland/NASCAR via Getty Images)
Dale Earnhardt, Jr., driver of the #88 Nationwide Chevrolet SS finishes in sixth place and Paul Menard, driver of the #27 FVP/Menards Chevrolet SS finishes in fourth place Sunday, March 22, 2015 in the NASCAR Sprint Cup race at Auto Club Speedway in Fontana, California. (Photo by Garry Eller/HHP for Chevy Racing)
Martin Truex, Jr., driver of the #78 Furniture Row/Visser Precision Chevrolet SS finishes in eighth place Sunday, March 22, 2015 in the NASCAR Sprint Cup race at Auto Club Speedway in Fontana, California. (Photo by Garry Eller/HHP for Chevy Racing)
Kurt Busch, driver of the #41 Haas Automation Chevrolet SS finishes in third place and Kevin Harvick, driver of the #4 Jimmy John`s/Budweiser Chevrolet SS finishes in second place Sunday, March 22, 2015 in the NASCAR Sprint Cup race at Auto Club Speedway in Fontana, California. (Photo by Garry Eller/HHP for Chevy Racing)
Kevin Harvick, driver of the #4 Jimmy John`s/Budweiser Chevrolet SS qualifies for 2nd position Friday, March 20, 2015 in the NASCAR Sprint Cup race at Auto Club Speedway in Fontana, California. Harvick leads the NASCAR Sprint Cup Series (NSCS) standings. Joining him on the front row will be Kurt Busch, driver of the #41 Haas Automation Chevrolet SS who won the Pole position. (Photo by Harold Hinson/HHP for Chevy Racing)
Kurt Busch, driver of the #41 Haas Automation Chevrolet SS celebrates with his team after winning the Pole position Friday, March 20, 2015 in the NASCAR Sprint Cup race at Auto Club Speedway in Fontana, California. Busch is 33rd in the NASCAR Sprint Cup Series (NSCS) standings. Joining him on the front row will be Kevin Harvick, driver of the #4 Jimmy John`s/Budweiser Chevrolet SS. (Photo by Garry Eller/HHP for Chevy Racing)
Kurt Busch, driver of the #41 Haas Automation Chevrolet SS won the Pole position Friday, March 20, 2015 in the NASCAR Sprint Cup race at Auto Club Speedway in Fontana, California. Busch is 33rd in the NASCAR Sprint Cup Series (NSCS) standings. Joining him on the front row will be Kevin Harvick, driver of the #4 Jimmy John`s/Budweiser Chevrolet SS. (Photo by Garry Eller/HHP for Chevy Racing)
Martin Truex Jr., driver of the #78 Furniture Row / Visser Precision Chevrolet, stands in the garage area prior to practice for the NASCAR Sprint Cup Series Auto Club 400 at Auto Club Speedway on March 20, 2015 in Fontana, California. (Photo Credit: Todd Warshaw/NASCAR via Getty Images)
Kevin Harvick, driver of the #4 Jimmy John’s/Budweiser Chevrolet SS celebrates his victory Sunday, March 15, 2015 in the NASCAR Sprint Cup race at Phoenix International Speedway in Phoenix, Arizona. This is Harvick`s fourth straight win at Phoenix. (Photo by Gregg Ellman/HHP for Chevy Racing)

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