RESTRICTOR PLATE HISTORY CHART

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Daytona 2/2011 29/32nd then 57/64
Talladerga 11/2010 15/16th
Daytona 7/2010 1 1/3rd
  • Changes for restrictor plate racing at Preseason-Testing: Preseason Thunder Testing for the Sprint Cup Series is Jan. 12-13-14 at Daytona International Speedway for final preparations for 2012 Speedweeks, in particular, the running of the 54th annual Daytona 500 – Sunday, Feb. 26, 2012. Rules package is a result of information gathered during recent tests at Talladega (October) and Daytona (November) the new rules package includes:
    Smaller radiator - Maximum of 2 gallon capacity
    Smaller overflow tank - Maximum capacity of ½ gallon
    Radiator inlet is moved up closer into the front center bumper area
    Rate reduction in the springs – softer springs
    Smaller rear spoiler
    Base line restrictor plate of 29/32 inch (1/64 inch larger than plate size for the 2011 Daytona 500)(NASCAR)
    AND NASCAR has issued a new technical bulletin to its Sprint Cup teams, detailing major changes to cooling systems for 2012 Speedweeks at Daytona International Speedway in an effort to better regulate tandem drafting. According to Chris Paulson, president and owner of C&R Racing Inc. -- which manufactures nearly all of the radiators used in NASCAR's premier series -- the sanctioning body will be significantly reducing the size of the radiators and changing the location of the grille openings before the cars return for Daytona testing in January. "[Sprint Cup Series director] John Darby is implementing a two-gallon maximum radiator size," Paulson said. "So in other words, the big, huge five-gallon radiators everybody's running will be down to two. And that accumulator can was a one-gallon max volume. It's going down to a half-gallon-sized can." The idea is to make the cooling systems less efficient, Paulson said, forcing the cars to run in open air to keep water temperatures down. "We'll probably see some result from that, but it's not going to be huge, mainly because they've got these things figured out now," Paulson said. "But it's still going to have an effect. The bigger effect is going to be moving the grille opening up to the bumper fascia area. Because now when they're tucked up behind another car, they're really going to kill all the air. So I think they're on the right track with that. They'll get the result that way."(NASCAR.com)(12-16-2011)

  • NASCAR Tweaks rules to limit drafting UPDATE plate smaller: NASCAR officials announced two technical changes Sunday evening aimed at preventing the sustained two-car drafts that dominated Saturday night's Budweiser Shootout at Daytona. Robin Pemberton, NASCAR's vice president of competition, said the body issued a bulletin to race teams with the following specifications:
    • The maximum size for the air inlet for the cooling system will be 2½ inches tall by 20 inches wide.
    • The pressure release valve on the water system will be set at 33 pounds per square inch.
    The intent is to set up the cars so they can't push each other in two-car tandems for extended runs without overheating. Teams try to line up drafting partners at Daytona and Talladega so they can overcome the limitations of the restrictor plates used to keep speeds down at those two tracks. "That will bring down the temperatures so the teams can't run at 290 or 300 degrees [without overheating] on the extended push of 30 or 40 laps," Pemberton said. "This will put [the water temperature in the engines] back in the 250-degree range." Several drivers, crew chiefs and team executives expected NASCAR to control the pressure relief valve. Jamie McMurray, who finished second to Kurt Busch in the Shootout, said many cars had valves that allowed the temperature up to 300 degrees before boiling over. That allowed the second car in the two-car draft to push longer without overheating -- some for more than a dozen laps -- under Saturday's cooler outdoor temperatures. The weather is expected to be warmer for Thursday's qualifying races and the Daytona 500.(see full story at ESPN.com)(2-13-2011)
    UPDATE - NASCAR makes change to restrictor plate: NASCAR announced Wednesday morning that the Sprint Cup teams will now use a 57/64 inch restrictor plate at Daytona for the Gatorade Duel and Daytona 500. The 1/64" plate is smaller then the 29/32nd inch plate that was being used. The change will reduce horsepower 12-13 hp and slow the cars down a bit.(SPEED coverage of rain delayed practice)(2-16-2011)

  • NASCAR goes to smaller plate at Daytona: NASCAR reportedly will down-size restrictor plate holes for next week’s Sprint Cup Goodyear tire test at Daytona International Speedway. The new size will be 29/32 of an inch. The old size was 30/32 of an inch. The result will be less power and, presumably, slower speeds. The track surface at Daytona was repaved since last year’s summer race. In earlier tests [January], the new surface, which is smoother and stickier, produced higher speeds [197mph].(RaceToday)(1-13-2011)

  • Bigger restrictor plate for Daytona in July: NASCAR has announced that NASCAR Sprint Cup Series teams will use carburetor restrictor-plate openings of 1 1/32 inches for the July 3 event at Daytona International Speedway. The previous plate at Daytona last February was 63/64-inch. Monday’s announcement pertains only to next month’s Coke Zero 400 Powered by Coca-Cola – the last NASCAR Sprint Cup Series event on the current Daytona asphalt. The 2.5-mile, high-banked superspeedway will be repaved prior to the 2011 Daytona 500. Each restrictor plate contains four openings which restrict air flow to the engine, thus slowing cars. Larger openings mean more air, and more speed. "We think this will be a needed boost due to the additional drag we've picked up since switching from a rear wing to a rear spoiler," said NASCAR Vice President of Competition Robin Pemberton. Rule changes, announced Jan. 21, mandated switching from a wing mounted on the rear deck lid of NASCAR’s new car, back to a more traditional stock-car spoiler. The March event at Martinsville Speedway marked the first race for the new spoiler. Carburetor restrictor plates are used only at Daytona and 2.66-mile Talladega Superspeedway. The 1 1/32-inch size openings will be the largest since the one-inch mandate in 1988, the first year the horsepower-reducing plates were mandated for yearly use in NASCAR Sprint Cup competition at Daytona. Teams used openings of 15/16-inch for this season’s spring race (April 25) at Talladega. That size was determined following a March 16 test at Talladega that helped answer several mechanical questions, among them, spoiler height and the restrictor-plate openings.(NASCAR)(6-7-2010)

    A quick primer on the plates: The restrictor plate is a thin, square aluminum piece with four holes that restrict airflow from the carburetor to the engine, resulting in less horsepower and a reduction in speed. It is located between the engine’s carburetor and intake manifold. Restrictor plates are used at Daytona International Speedway and Talladega Superspeedway.

    Date

    Track

    Plate Size

    Pole Winner

    Pole Speed

    Winner

    Notes

    Feb-87

    Daytona

    none

    Bill Elliott

    210.364

    Bill Elliott

    no restrictions

    May-87

    Talladega

    none

    Bill Elliott

    212.809

    Davey Allison

    no restrictions

    Jul-87

    Daytona

    none

    Davey Allison

    198.085

    Bobby Allison

    A 390 CFM carburetor was used

    Jul-87

    Talladega

    none

    Bill Elliott

    203.827

    Bill Elliott

    A 390 CFM carburetor was used

    Feb-88

    Daytona

    1 inch

    Ken Schrader

    193.823

    Bobby Allison

    First Use of a restrictor plate

    Apr-88

    Talladega

    1 inch

    Davey Allison

    198.969

    Phil Parsons

     

    Jul-88

    Daytona

    1 inch

    Darrell Waltrip

    193.819

    Bill Elliott

     

    Jul-88

    Talladega

    1 inch

    Darrell Waltrip

    196.274

    Ken Schrader

     

    Feb-89

    Daytona

    1 inch

    Ken Schrader

    196.996

    Darrell Waltrip

     

    May-89

    Talladega

    15/16 inches

    Mark Martin

    193.061

    Davey Allison

     

    Jul-89

    Daytona

    15/16 inches

    Mark Martin

    191.861

    Davey Allison

     

    Jul-89

    Talladega

    15/16 inches

    Mark Martin

    194.800

    Terry Labonte

     

    Feb-90

    Daytona

    15/16 inches

    Ken Schrader

    196.515

    Derrike Cope

     

    May-90

    Talladega

    15/16 inches

    Bill Elliott

    199.388

    Dale Earnhardt

     

    Jul-90

    Daytona

    15/16 inches

    Greg Sacks

    195.533

    Dale Earnhardt

     

    Jul-90

    Talladega

    29/32 inches

    Dale Earnhardt

    192.513

    Dale Earnhardt

     

    Feb-91

    Daytona

    29/32 inches

    Davey Allison

    195.955

    Ernie Irvan

     

    May-91

    Talladega

    7/8 inches

    Ernie Irvan

    195.186

    Harry Gant

     

    Jul-91

    Daytona

    7/8 inches

    Sterling Marlin

    190.331

    Bill Elliott

     

    Jul-91

    Talladega

    7/8 inches

    Sterling Marlin

    192.085

    Dale Earnhardt

     

    Feb-92

    Daytona

    7/8 inches

    Sterling Marlin

    192.213

    Davey Allison

    35 degree spoiler was used

    May-92

    Talladega

    7/8 inches

    Ernie Irvan

    192.831

    Davey Allison

     

    Jul-92

    Daytona

    7/8 inches

    Sterling Marlin

    189.366

    Ernie Irvan

    45 degree spoiler was used

    Jul-92

    Talladega

    7/8 inches

    Sterling Marlin

    190.586

    Ernie Irvan

     

    Feb-93

    Daytona

    7/8 inches

    Kyle Petty

    189.426

    Dale Jarrett

     

    May-93

    Talladega

    7/8 inches

    Dale Earnhardt

    192.355

    Ernie Irvan

     

    Jul-93

    Daytona

    7/8 inches

    Ernie Irvan

    190.327

    Dale Earnhardt

     

    Jul-93

    Talladega

    7/8 inches

    Bill Elliott

    192.397

    Dale Earnhardt

     

    Feb-94

    Daytona

    7/8 inches

    Loy Allen

    190.158

    Sterling Marlin

     

    May-94

    Talladega

    7/8 inches

    Ernie Irvan

    193.298

    Dale Earnhardt

     

    Jul-94

    Daytona

    7/8 inches

    Dale Earnhardt

    191.339

    Jimmy Spencer

     

    Jul-94

    Talladega

    7/8 inches

    Dale Earnhardt

    193.470

    Jimmy Spencer

     

    Feb-95

    Daytona

    7/8 inches

    Dale Jarrett

    196.498

    Sterling Marlin

     

    Apr-95

    Talladega

    7/8 inches

    Terry Labonte

    196.532

    Mark Martin

     

    Jul-95

    Daytona

    7/8 inches

    Dale Earnhardt

    191.355

    Jeff Gordon

     

    Jul-95

    Talladega

    7/8 inches

    Sterling Marlin

    194.212

    Sterling Marlin

     

    Feb-96

    Daytona

    29/32 inches

    Dale Earnhardt

    189.510

    Dale Jarrett

    14:1 compression ratio

    Apr-96

    Talladega

    29/32 inches

    Ernie Irvan

    192.855

    Sterling Marlin

     

    Jul-96

    Daytona

    29/32 inches

    Jeff Gordon

    188.869

    Sterling Marlin

     

    Jul-96

    Talladega

    29/32 inches

    Jeremy Mayfield

    192.370

    Jeff Gordon

     

    Feb-97

    Daytona

    29/32 inches

    Mike Skinner

    189.813

    Jeff Gordon

     

    May-97

    Talladega(a)

    29/32 inches

    John Andretti

    193.627

    Mark Martin

     

    Jul-97

    Daytona

    29/32 inches

    Mike Skinner

    189.777

    John Andretti

     

    Oct-97

    Talladega

    29/32 inches

    Ernie Irvan

    193.271

    Terry Labonte

     

    Feb-98

    Daytona

    29/32 inches

    Bobby Labonte

    192.415

    Dale Earnhardt

    12:5 to 1 compression ratio

    Apr-98

    Talladega

    29/32 inches

    Bobby Labonte

    195.728

    Bobby Labonte

     

    Oct-98

    Talladega

    29/32 inches

    Ken Schrader

    196.153

    Dale Jarrett

     

    Oct-98

    Daytona(b)

    29/32 inches

    Bobby Labonte

    193.611

    Jeff Gordon

     

    Feb-99

    Daytona

    29/32 inches

    Jeff Gordon

    195.067

    Jeff Gordon

     

    Apr-99

    Talladega

    29/32 inches

    Ken Schrader

    197.765

    Dale Earnhardt

     

    Jul-99

    Daytona

    29/32 inches

    Joe Nemechek

    194.860

    Dale Jarrett

     

    Oct-99

    Talladega

    29/32 inches

    Joe Nemechek

    193.331

    Dale Earnhardt

     

    Feb-00

    Daytona

    29/32 inches

    Dale Jarrett

    191.091

    Dale Jarrett

    NASCAR issued front and rear shocks required; minimum rear spring rate of 345 pounds

    Apr-00

    Talladega

    7/8 inches

    Jeremy Mayfield

    186.969

    Jeff Gordon

    Restrictions on front shocks removed

    Jul-00

    Daytona

    7/8 inches

    Dale Jarrett

    187.547

    Jeff Burton

     

    Sep-00

    New Hampshire

    1 inch

    Bobby Labonte

    127.632

    Jeff Burton

    Used to slow cars down, in response to deaths of Irwin and Petty. Track Record is 132.089mph

    Oct-00

    Talladega

    15/16 inches

    Joe Nemechek

    190.279

    Dale Earnhardt

    To give some power back to the drivers, aerodynamics used to slow down the cars. aero changes: 1) rear spoiler angle from 45deg to 70deg, with a 1in, forward-facing flange at top of spoiler; 2) front air dam of 4in up from 3.5in; 3) addition of a roof spoiler, 1 3/8in high by 40in wide, 10 inches behind the top of the windshield. 4) Fords and Pontiacs rear spoilers 59in wide, up from 57, Chevy stays at 57in.  On Sat Oct 14th before Happy Hour Practice, NASCAR changed the plates to a 15/16th inch plate as practice speeds were too high

    Feb-01

    Daytona

    15/16 inches

    Bill Elliott

    183.565

    Michael Waltrip

    Same package as Talladega in Oct 2000, Dale Earnhardt killed in accident during race

    Apr-01

    Talladega

    15/16 inches

    Stacy Compton

    184.621

    Bobby Hamilton

    Same Package as Daytona 01 and Talladega last July.  Ford was allowed 2 less inches of spoiler width.  Race had NO cautions.

    July-01

    Daytona

    15/16 inches

    Sterling Marlin

    183.778

    Dale Earnhardt Jr

    Same package as Talladega, no changes

    Oct-01

    Talladega

    15/16 inches

    Stacy Compton

    185.240

    Dale Earnhardt Jr

    Ford teams rear spoilers reduced from 57 inches to 55½ inches.  Pontiac reduction on the size of the roof blade, trimmed one-eighth of an inch to 1¼ inches. Ford, Chevy and Dodge will continue to use 1 3/8-inch blades

    Feb-02

    Daytona

    7/8 inches

    Jimmie Johnson

    185.831

    Ward Burton

    Spoiler package 55-degree spoiler angle rather than the 70-degree spoiler angle  used at Talladega in 2001.  Spoiler maximum width of 57”. Spoiler heights as follow: Chevy and Dodge 6 1/4”, Ford 5 3/4”, and Pontiac 6 1/2“. The size of the restrictor-plate is 7/8". The roof air deflectors and forward-facing flange on top of the spoiler used during restrictor plate races since last October will be removed.

    Apr-02

    Talladega

    7/8 inches

    Jimmie Johnson

    186.532

    Dale Earnhardt Jr

    NASCAR announced a ¼-inch increase for the rear spoiler height on the Ford Taurus to be used in the Talladega 500 at Talladega Superspeedway.  Measurements for the rear spoilers on the Ford Taurus will now read at 6 inches tall by 57 inches wide.  The Chevrolet and Dodge teams rear spoiler will remain at 6 ¼ inches tall, while the Pontiac teams will measure at 6 ½ inches tall by 57 inches wide. ALSO: the one engine rule in effect.

    July-02

    Daytona

    7/8 inches

    Kevin Harvick

    185.041

    Michael Waltrip

    Officials also reduced the spoiler size on the Ford Taurus from 6 inches to 5-7/8 inches for the 2002 Pepsi 400 at Daytona.  During the Daytona 500 in February, the Ford's rear spoiler was 5 ¾ inches tall and in April at Talladega, Ford's measurements were 6 inches tall. The Chevrolet and Dodge teams rear spoiler will remain at 6 ¼ inches tall, while the Pontiac teams will measure at 6 ½ inches tall by 57 inches wide

    Oct-02

    Talladega

    7/8 inches

    Jimmie Johnson

    Points/rain

    Dale Earnhardt Jr

    Same as Daytona 7/2002 and smaller fuel-box size will be reduced to 20 by 17 by 9.75, giving a capacity of 12.5gal.

    Feb-03

    Daytona

    7/8 inches

    Jeff Green

    186.606

    Michael Waltrip

    Using smaller fuel-box.  All manufacturers will have the same 1.5-inch nose "kickout," or the extension of the front air dam below the bumper.  All four makes, which have to mount their bodies on the same reference point, will also use the identical rear spoiler package -- 6.25” high by 57” wide at a 55-degree angle.  Have heard nothing about changes in the restrictor plate size.  Also total rear weight of the right rear and the left rear to not exceed 50-percent of a car's minimum weight.

    Apr-03

    Talladega

    7/8 inches

    Jeremy Mayfield

    186.489

    Dale Earnhardt Jr

    Rules same as Daytona: Those rules (for 2003 model cars): rear spoilers must by 6¼ inches tall and 57 inches wide; rear spoiler angles must be minimum of 55 degrees and maximum of 65 degrees; restrictor plate openings must be 7/8 inch. There is one slight modification: rear spoilers must have a minimum thickness of 3/16 inch. Also, the approximate 13.5-gallon fuel cell will again be used

    July-03

    Daytona

    7/8 inches

    Steve Park

    184.752

    Greg Biffle

    Same rules as Daytona 500 and Talladega AND added a rear roof air deflector to the left side of the rear window

    Sept-03

    Talladega

    29/32

    Elliott Sadler

    189.943

    Michael Waltrip

    Increase the height of the rear spoilers from 6 1/4” to 6 3/4”, 57 inches wide; open the restrictor plate from 7/8” to  29/32”

    Feb-04

    Daytona 500

    29/32

    Greg Biffle

    188.387

    Dale Earnhardt Jr.

    Same as Talladega in Sept 2003

    Apr-04

    Talladega

    29/32

    Ricky Rudd

    191.180

    Jeff Gordon

    Same as Talladega in Sept 2003

    July-04

    Daytona

    29/32

    Jeff Gordon

    188.660

    Jeff Gordon

    Same as Talladega in Sept 2003

    Oct-04

    Talladega

    29/32

    Joe Nemechek

    190.749

    Dale Earnhardt Jr.

    NASCAR hands out 375lb rear springs that are mandatory

    Feb-05

    Daytona 500

    57/64

    Dale Jarrett

    188.312

    Jeff Gordon

    Restrictor plate down 1/64”, spoilers at 55 degrees, same spring rule.

    Apr-05

    Talladega

    57/64

    Kevin Harvick

    189.804

    Jeff Gordon

    Same as Daytona

    July-05

    Daytona

    57/64

    Tony Stewart

    185.582

    Tony Stewart

    Same as Talladega in April

    Oct-05

    Talladega

    57/64

    Elliott Sadler

    189.260

    Dale Jarrett

    Same as Daytona in July

    Feb-06

    Daytona 500

    57/64

    Jeff Burton

    189.151

    Jimme Johnson

    Same as Talladega in Oct

    May-06

    Talladega

    57/64

    Elliott Sadler

    188.511

    Jimmie Johnson

    Same as Daytona in Feb

    July-06

    Daytona

    57/64

    Boris Said

    186.143

    Tony Stewart

    Same as Talladega in May

    Oct-06

    Talladega

    7/8

    David Gilliland 

    191.712 

    Brian Vickers 

    After practice speeds on the new surface were over 198mph, NASCAR dropped the plate size from 57/64 to 7/8

    Feb-07

    Daytona 500

    7/8

    David Gilliland

    186.320

    Kevin Harvick

    Same as Talladega

    Apr-07

    Talladega

    7/8

    Jeff Gordon

    192.069

    Jeff Gordon

    Same as Daytona

    July-07

    Daytona

    7/8

    Jeff Gordon

    Points/rain

    Jamie McMurray

    Same as Talladega

    Oct-07

    Talladega

    31/32

    Michael Waltrip

    189.070

    Jeff Gordon

    First for the COT car, plate size opened a tad

    Feb-08

    Daytona 500

    31/32

    Jimmie Johnson

    187.075

    Ryan Newman

    Same as Talladega in Oct 2007

    Apr-08

    Talladega

    15/16

     

     

     

    Plate size dropped to 15/16ths of an inch

    July-08

    Daytona

     

     

     

     

     

    Oct-08

    Talladega

     

     

     

     

     

     

     

     

     

     

     

     

    (a) rain delayed 2 weeks

     

     

     

    (b) wildfires postponed race from July 1998

     

     

     

     

     

     

     

     

     

     


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