Category: Horsepower

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Daytona, Catchfences and Flying Cars

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Track barriers originally were erected to keep cars separated from spectators. In addition to concrete walls to prevent the cars from driving off track, debris-spewing accidents necessitated fencing to contain airborne objects.

Catchfences should have the same properties as walls, but they can’t block the view. Chain link fence is a good compromise: It’s cheap, plentiful, easy to put up and surprisingly strong given its high visibility.

Chain-link fabric is an elastic metal mesh. It can give in two ways: gentle forces cause the mesh to deform. The diamonds stretch out of shape, but when the force is removed, the fabric springs back to its original shape. The fence can also deform by stretching the wires that make up the mesh. A large-enough force will break the wire entirely.

Busch, KurtDensityDover International SpeedwayElectronic Fuel InjectionExplosionsFireFuelFuel MileageHorsepowerMoneyRatiosSafetyTemperatureVolumeWeather

Computational Fluid DynamicsEnginesHorsepowerRestrictor PlatesTapered Spacers

Charlotte Motor SpeedwayDownforceDragEnginesHorsepowerKansasNASCARRear-End GearsRulesSpoilersTapered SpacersTiresWeather

2015 Rules: Track Records I – The Example of Charlotte

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@NASCARRealTime, @TheOrangeCone and @CircleTrackNerd had an interesting dialog when the 2015 rules were announced. They were debating whether the track records that are now standing are going to be essentially locked into history. The debate ended with an appeal to me and Goody’s Headache Powder.

AerodynamicsBrowne, JoshDaytonaGripHorsepowerLift-Off SpeedTerminal Velocity

How Fast Would NASCAR Cars Go at Daytona without Restrictor Plates?

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Doug Yates was guest on Dave Moody’s SiriusXM Speedway last week. He brought up a conversion you hear a lot in the week before Daytona and Talladega. Every 25 horsepower in the engine translates to about a 1 second decrease in lap times. Dave did the math: Removing the plates would increase the engine by 450 horsepower. Four hundred and fifty more horsepower equates to 18 seconds off the lap time, assuming all other things equal. That last part was a very important qualification. It will come back to haunt us in a moment.

EnginesGripHorsepowerJoe Gibbs RacingLas Vegas22MaterialsMichael Waltrip RacingReutimann, DavidRoush Fenway RacingTestingToyotaVickers, BrianWaltrip, Michael

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