Editing NASCAR Xfinity Series (section)

==Xfinity Series cars==

In the early 1980s, teams were switching from the General Motors 1971–77 X-Body compact cars with 311-cubic inch engines. Later, teams were using General Motors 1982–87 G-body cars. Ford teams have used the Thunderbird cars consistently.

In 1989, NASCAR changed rules requiring cars to use current body styles, similar to the Cup cars. However, the cars still used V6 engines. The cars gradually became similar to Cup cars.

In 1995, changes were made. The series switched to V-8s with a [[compression ratio]] of 9:1 (as opposed to 14:1 for Cup at the time). The vehicle weight with driver was set at 3,300 pounds (as opposed to 3,400 for Cup). The body style changes, as well as the introduction of V-8s, made the two series' cars increasingly similar.

The [[suspension (vehicle)|suspensions]], brake systems, transmissions, were identical between the two series, but The [[Car of Tomorrow]] eliminates some of these commonalities. The Car of Tomorrow is taller and wider than the [[Generation 4 (NASCAR)|Generation 4]]-based vehicles in the then-Nationwide Series, and until 2010, it utilizes a front "splitter", opposed to a front valance. The Car of Tomorrow also set [[Pole position|pole]] speeds slower than the NXS cars at companion races.<ref>{{cite web|url=http://www.racing-reference.info/race?id=2007-26&series=W|title=09/08/2007 race: Chevy Rock & Roll 400 (Cup) - Racing-Reference.info|website=www.racing-reference.info|access-date=July 14, 2018}}</ref>

Previously, Busch Series cars used [[tetraethyllead|fuel that contained lead]]. NASCAR conducted a three-race test of unleaded gasoline in this series that began on July 29, 2006, with a race at [[Gateway International Raceway]]. The fuel, [[Sunoco]] GT 260 Unleaded, became mandatory in all series starting with the second weekend of the 2007 series, with Daytona being the last race weekend using leaded gasoline.

Another distinction between the cars started in 2008: [[Goodyear Tire and Rubber Company|Goodyear]] had developed a [[rain tire]] for NASCAR [[road course]] racing in both series but NASCAR had yet to use them under race conditions by the time NASCAR abandoned the program for the Cup Series in 2005 (the Cup Series eventually used rain tires at the [[2020 Bank of America Roval 400]] and [[2021 Texas Grand Prix]]), but the Busch Series continued to use rain tires in races at [[Autodromo Hermanos Rodriguez]] and [[Circuit Gilles Villeneuve]], since the races could not be planned with rain dates. When rain started to fall at the 2008 [[NAPA Auto Parts 200]], the tires were used in the rain for the first time.<ref>[http://www.thatsracin.com/news/story/17069.html Thatsracin.com]{{dead link|date=July 2016 |bot=InternetArchiveBot |fix-attempted=yes }} "NASCAR races in the rain in Montreal". Retrieved January 23, 2009.</ref>

Another distinction was added in 2012, when NASCAR changed the fuel delivery system in the Cup cars from carburetion to [[fuel injection]]. NXS cars continue to use carburetors. Furthermore, with the Cup Series' switch to [[Next Gen (NASCAR)|Next Gen]] car in 2022, Xfinity cars (as well as Truck Series vehicles) continue to use traditional five-lug steel wheels and centered door numbers, as opposed to an aluminum center lock wheel and numbers being placed behind the front wheel on the Next Gen.

===Specifications for Generation 4 NXS car===
[[File:Template NASCAR.jpg|thumb|NASCAR officials use a [[Template (racing)|template]] to inspect [[Casey Atwood]]'s 2004 Busch Series [[Chevrolet Monte Carlo]].]]

* '''Chassis''': Steel tube frame with integral safety roll cage – must meet NASCAR standards
* '''Engine displacement''': {{convert|5860|cc|cuin|0|abbr=on}} [[Pushrod engine|Pushrod]] [[V8 engine|V8]]
* '''Transmission''': 4-speed [[Manual transmission|manual]]
* '''Weight''': {{Convert|3200|lb|kg|0|abbr=on}} minimum (without driver); {{Convert|3400|lb|kg|0|abbr=on}} minimum (with driver)
* '''Power output''': 650–700 [[Horsepower|hp]] (485–522&nbsp;kW) unrestricted, ≈450&nbsp;hp (335&nbsp;kW) [[restrictor plate|restricted]]
* '''Torque''': {{convert|700|Nm|ftlb|lk=on|abbr=on}}
* '''Fuel''': 90 MON, 98 [[Octane rating|RON]], 94 AKI unleaded gasoline provided by [[Sunoco]] 85% + Sunoco Green Ethanol E15
* '''Fuel capacity''': {{convert|18|usgal|L|0|abbr=off}}
* '''Fuel delivery''': [[Carburetor|Carburetion]]
* '''Compression ratio''': 12:1
* '''Aspiration''': [[Naturally-aspirated engine|Naturally aspirated]]
* '''Carburetor size''': 390&nbsp;ft<sup>3</sup>/min (184 L/s) 4 barrel
* '''Wheelbase''': {{convert|105|in|mm|0|abbr=on}}
* '''Steering''': [[Power steering|Power]], [[recirculating ball]]
* '''Tires''': [[Slick tire|Slick]] (all tracks) and [[rain tire]]s (road courses only if in case of rainy conditions) provided by [[Goodyear Tire and Rubber Company|Goodyear Eagle]]
* '''Length''': {{convert|203.75|in|mm|0|abbr=on}}
* '''Width''': {{convert|75|in|mm|0|abbr=on}}
* '''Height''': {{convert|51|in|mm|0|abbr=on}}
* '''Safety equipment''': [[HANS device]], [[seat belt]] 6-point supplied by Willans

===Xfinity "Car of Tomorrow" (CoT)=== <!--According to NASCAR, the official initializing of the Car of Tomorrow is "CoT", ''not'' "COT".-->
{{main|Car of Tomorrow}}
[[File:NationwideCOT2010NMPA.jpg|thumb|2010 Nationwide Car of Tomorrow]]

The then Nationwide Series unveiled its "Car of Tomorrow" (CoT) at the July 2010 race at [[Daytona International Speedway]]. Before being fully integrated in the 2011 season, it was also used in 2010 races at [[Michigan International Speedway]], [[Richmond International Raceway]] and [[Charlotte Motor Speedway]].<ref>{{cite web|url=https://ca.sports.yahoo.com/nascar/news?slug=ap-nascar-nationwide-newcar&prov=ap&type=lgns |title=Yahoo! Canada Sports&nbsp;– Sports News, Scores, Rumors, Fantasy Games, and more |publisher=Ca.sports.yahoo.com |access-date=July 13, 2010 |url-status=dead |archive-url=https://web.archive.org/web/20110809111147/https://ca.sports.yahoo.com/nascar/news?slug=ap-nascar-nationwide-newcar |archive-date=August 9, 2011 }}</ref> The Xfinity CoT has important differences from the NASCAR Cup Series [[Car of Tomorrow|CoT]], and the now-retired Generation 4 style car. The body and aerodynamic package differs from the NASCAR Cup Series cars, marketing American [[pony car]]s from the 1960s such as the [[Ford Mustang]], [[Dodge Challenger]], and [[Chevrolet Camaro]]. The change to share the same CoT chassis as the Cup series resulted in the wheelbase being lengthened from 105 to 110 inches<ref>{{cite web|author=Mark Aumann |url=http://www.nascar.com/2007/news/headlines/bg/10/28/nationwide.cot.2009/index.html |title=COT planned for 2009 Nationwide Series debut&nbsp;– Oct 28, 2007 |publisher=Nascar.Com |date=October 28, 2007 |access-date=July 13, 2010}}</ref><ref>{{Cite web|url=http://www.nascar.com/2007/news/headlines/bg/10/28/nationwide.cot.2009/index.html|title=NASCAR.COM - COT planned for 2009 Nationwide Series debut - Oct 28, 2007|date=February 18, 2010|access-date=May 26, 2022|archive-date=February 18, 2010|archive-url=https://web.archive.org/web/20100218001749/http://www.nascar.com/2007/news/headlines/bg/10/28/nationwide.cot.2009/index.html|url-status=bot: unknown}}</ref><ref>{{cite web | url=https://bleacherreport.com/articles/413381-nationwides-car-of-tomorrow-debuts-at-daytona | title=NASCAR: Daytona Debuts Nationwide's Car of Tomorrow | website=[[Bleacher Report]] }}</ref>

Each manufacturer uses a distinct body design (similar to 1960s muscle cars), built within strict aerodynamic guidelines provided by NASCAR. The [[Chevrolet]] car body currently resembles the [[Chevrolet Camaro (sixth generation)|SS]], after initially running the [[Chevrolet Impala#Ninth generation (2006–2016)|Impala]] and then the [[Chevrolet Camaro (fifth generation)|Zeta-based Camaro]] (which coincided with GM's Cup car being its four-door Zeta counterpart, the [[Holden Commodore (VF)|Holden VF Commodore based Chevrolet SS]], being used in Cup at the time). [[Ford Motor Company|Ford]] uses the [[Ford Mustang (seventh generation)|Mustang Dark Horse]]. [[Toyota]] runs the [[Toyota Camry (XV70)|Camry]], reconfigured in 2015 to resemble the current production model. Toyota announced they would be running the [[Toyota Supra#A90|GR Supra]] starting in 2019, replacing the Camry, which had been run in the series since Toyota joined the Xfinity Series in 2007.<ref>{{Cite web|url=https://www.toyota.com/concept-vehicles/supra/xfinity-series/|title=2019 Toyota Supra Xfinity Series Race Car {{!}} Toyota Nascar|website=www.toyota.com|language=en-US|access-date=September 21, 2018}}</ref> [[Dodge]] teams used the [[Dodge Challenger (2008)|Challenger R/T]] model, despite the manufacturer pulling all factory support after 2012 (though it continued in Canada as FCA Canada still supports the Pinty's Series). Following Dodge's exit, smaller underfunded teams continued to run second-hand Challenger chassis without factory support (thus earning the nickname "Zombie Dodges").<ref>{{cite magazine |url=https://www.roadandtrack.com/motorsports/news/a7155/nascar-dodges-without-factory-support/ |title=Zombie Dodges race in NASCAR after factory pulled plug |first=Jeffrey N. |last=Ross |magazine=[[Road & Track]] |date=February 25, 2014 |access-date=November 24, 2018}}</ref><ref>{{cite web|url=https://ca.sports.yahoo.com/nascar/news?slug=nascar_com-retro.racing.nationwide.new.car-20091031&prov=nascar_com&type=lgns |title=Yahoo! Canada Sports&nbsp;– Sports News, Scores, Rumors, Fantasy Games, and more |publisher=Ca.sports.yahoo.com |access-date=July 13, 2010 |url-status=dead |archive-url=https://web.archive.org/web/20110809111155/https://ca.sports.yahoo.com/nascar/news?slug=nascar_com-retro.racing.nationwide.new.car-20091031 |archive-date=August 9, 2011}}</ref> As a result of a rules change after the 2018 season, all Challenger chassis were rendered ineligible for competition, as the series made the switch to composite body panels. Since FCA had pulled factory support years earlier, no new body was submitted for competition, ending the possibility of running a Challenger chassis in the series.<ref>{{cite web |last1=Nguyen |first1=Justin |title=NASCAR Bids Farewell to Dodge after 2018|url=https://www.thecheckeredflag.co.uk/2018/11/nascar-bids-farewell-to-dodge-after-2018/ |website=www.thecheckeredflag.co.uk |date=November 16, 2018 |access-date=November 20, 2018}}</ref>