2022 NASA ST/TT Car Classification Calculator

What Class do you Want to Compete In?*

Minimum Competition Weight with Driver (lbs)*

Weight Factor (ST1-4/TT1-4)

Calculated

Recommended Minimum Competition Weight with Driver (lbs)

Calculated (Approximate. Does not account for the weight factor change.)

Max Average Horsepower (Max Avg HP)

Calculated

Declared Max Average Horsepower (Max Avg HP)

Calculated (Rounds Fractions Down)

Total Mod Factor

Calculated

Power*

Manually, mechanically actuated throttle body (no electronic servo) +0.2Not Applicable

Tire Size (ST1-2/TT1-2)*

DOT-approved: NASA Section Width 266mm or smaller +0.6DOT- approved: NASA Section Width 267mm to 282mm +0.3Non-DOT approved: Size 9.5”/241mm/24cm or smaller +0.6Non-DOT approved: Size 10.5”/270mm/27cm to 9.6”/242mm/25cm +0.3Not Applicable

Tire Size (ST3/TT3)*

DOT-approved: NASA Section Width 266mm or smaller +0.6DOT- approved: NASA Section Width 267mm to 282mm +0.3Non-DOT approved: Size 9.5”/241mm/24cm or smaller +0.6Non-DOT approved: Size 10.5”/270mm/27cm to 9.6”/242mm/25cm +0.3Not Applicable

Tire Size (ST4/TT4)*

NASA Section Width 266mm or smaller (DOT-approved) +0.6NASA Section Width 267mm to 282mm (DOT- approved) +0.3

Tire Type (ST1-2/TT1-2)*

Non-DOT approved tires (ST1/TT1, ST2/TT2 Only) -0.5BFGoodrich g-Force Rival, Continental Extreme Contact Sport,Cooper RS3-R, Falken Azenis RT615K+, Maxxis Victra RC-1,Maxxis Victra VR-1, Michelin Pilot Sport 4S, Nankang AR-1,Nitto NT01, Toyo Proxes R1R/R888/R888R/RA-1/RR,Valino VR08GP +1.6Bridgestone Potenza Re-71r, BFGoodrich g-Force Rival S 1.5,Continental Extreme Contact Force, Dunlop Direzza ZIII,Falken Azenis RT660, Federal 595 RS-RR,Goodyear Eagle FI SuperCar 3, Hankook Ventus RS4,Kumho ECSTA V730, Michelin Sport Cup 2 Connect, Nankang CR-1,Nexen Nfera SUR4G, Yokohama Advan A052 +1.0Not Applicable

Tire Type (ST3/TT3)*

Non-DOT approved tires (ST3/TT3 Only) -0.7BFGoodrich g-Force Rival, Continental Extreme Contact Sport,Cooper RS3-R, Falken Azenis RT615K+, Maxxis Victra RC-1,Maxxis Victra VR-1, Michelin Pilot Sport 4S, Nankang AR-1,Nitto NT01, Toyo Proxes R1R/R888/R888R/RA-1/RR,Valino VR08GP +1.6Bridgestone Potenza Re-71r, BFGoodrich g-Force Rival S 1.5,Continental Extreme Contact Force, Dunlop Direzza ZIII,Falken Azenis RT660, Federal 595 RS-RR,Goodyear Eagle FI SuperCar 3, Hankook Ventus RS4,Kumho ECSTA V730, Michelin Sport Cup 2 Connect, Nankang CR-1,Nexen Nfera SUR4G, Yokohama Advan A052 +1.0Not Applicable

Tire Type (ST4/TT4)*

BFGoodrich g-Force Rival, Continental Extreme Contact Sport,Cooper RS3-R, Falken Azenis RT615K+, Maxxis Victra RC-1,Maxxis Victra VR-1, Michelin Pilot Sport 4S, Nankang AR-1,Nitto NT01, Toyo Proxes R1R/R888/R888R/RA-1/RR,Valino VR08GP +1.6Bridgestone Potenza Re-71r, BFGoodrich g-Force Rival S 1.5,Continental Extreme Contact Force, Dunlop Direzza ZIII,Falken Azenis RT660, Federal 595 RS-RR,Goodyear Eagle FI SuperCar 3, Hankook Ventus RS4,Kumho ECSTA V730, Michelin Sport Cup 2 Connect, Nankang CR-1,Nexen Nfera SUR4G, Yokohama Advan A052 +1.0DOT-approved R-comp Autocross tires (examples: A6, A7, DOT Wet, R1S, RS AC, Z214-C90/91) -1.0Not Applicable

Chassis (ST1/TT1)*

Sports racers, “Prototypes”, monocoque race cars (ST1/TT1) -2.5Other Non-Production Vehicle (ST1/TT1, ST2/TT2, ST3/TT3 only) -0.4Not Applicable

Chassis (ST2/TT2)*

Sports racers, “Prototypes”, monocoque race cars (ST2/TT2) -3.4Other Non-Production Vehicle (ST1/TT1, ST2/TT2, ST3/TT3 only) -0.4Not Applicable

Chassis (ST3/TT3)*

Non-Production Vehicle (ST1/TT1, ST2/TT2, ST3/TT3 only) -0.4Not Applicable

Production Vehicle Body Modifications (ST1-2/TT1-2)

Modification of the OEM roof line/shape and/or windshield/frame removal -0.3Modification of the floor pan for exhaust clearance only and/or the rocker panel for side exit exhaust only -0.2Not Applicable

Production Vehicle Body Modifications (ST3-4/TT3-4)

Modification of the OEM roof line/shape and/or windshield/frame removal -0.3Modification of the floor pan for exhaust clearance only and/or the rocker panel for side exit exhaust only -0.2BTM Aero (see 6.3) +0.4Not Applicable

Transmission (ST1-2/TT1-2)*

H pattern to sequential conversion shifter kit (shifter mod only) -0.2ST1 & ST2: Dog-ring/straight-cut gears (non-synchromesh),and/or sequential/paddle shift/semi-automatic -0.2Not Applicable

Transmission (ST3-4/TT3-4)*

H pattern to sequential conversion shifter kit (shifter mod only) -0.2OEM dual clutch (ex. DCT, DSG, PDK), all automatic transmissions w/ 6 gears or more, Dog-ring/straight-cut gears -0.5Other OEM street-legal model available paddle shift (ex. SMG), or sequential motorcycle gearbox -0.3All other sequential/semi-automatic -1.0Not Applicable

Drivetrain (ST1/TT1)*

AWD -0.3FWD (non-Production Factory Built Race Car) +0.8FWD +1.0 (all other)RWD

Drivetrain (ST2/TT2)*

AWD -0.3FWD (non-Production Factory Built Race Car) +0.5FWD +1.0 (all other)RWD

Drivetrain (ST3/TT3)*

AWD -0.3FWD (non-Production Factory Built Race Car) +0.2FWD +1.0 (all other)RWD

Drivetrain (ST4/TT4)*

AWD -0.5FWD +0.6RWD

Additional Mod Factor for Specific Models/Items (ST1-4/TT1-4)

Check (ST1-4/TT1-4) rules

Mod Factor Explanation (ST1-4/TT1-4)

Copy from the rules

Minimum Competition Weight with Driver (lbs)*

Weight Factor (ST5-6/TT5-6)

Calculated

Recommended Minimum Competition Weight with Driver (lbs)

Calculated (Approximate. Does not account for the weight factor change.)

Max Average Horsepower (Max Avg HP)

Calculated

Declared Max Average Horsepower (Max Avg HP)

Calculated (Rounds Fractions Down)

Total Mod Factor

Calculated

Power*

Manually, mechanically actuated throttle body (no electronic servo) +0.2Not Applicable

Tire Size (ST5-6/TT5-6)*

NASA Section Width 257mm or less with MCW greater than 2749 lbs +0.3NASA Section Width 226mm or less with MCW between 2400 lbs. and 2749 lbs +0.3Not Applicable

Tire Type (ST5-6/TT5-6)*

BFGoodrich g-Force Rival, Continental Extreme Contact Sport,Cooper RS3-R, Falken Azenis RT615K+, Maxxis Victra RC-1,Maxxis Victra VR-1, Michelin Pilot Sport 4S, Nankang AR-1,Nitto NT01, Toyo Proxes R1R/R888/R888R/RA-1/RR,Valino VR08GP +1.6Bridgestone Potenza Re-71r, BFGoodrich g-Force Rival S 1.5,Continental Extreme Contact Force, Dunlop Direzza ZIII,Falken Azenis RT660, Federal 595 RS-RR,Goodyear Eagle FI SuperCar 3, Hankook Ventus RS4,Kumho ECSTA V730, Michelin Sport Cup 2 Connect, Nankang CR-1,Nexen Nfera SUR4G, Yokohama Advan A052 +1.0Not Applicable

Brakes (ST5-6/TT5-6)*

Non-OEM, modified or relocated brake calipers/brackets or rotor diameter -0.2Not Applicable

Suspension (ST5-6/TT5-6)

Suspension design utilizing upper “A-arm” or “wishbone” type control arms (front or rear) -0.7Replace, modify, or remove control arms, camber arms/links, toe arms/links -0.5Add, replace, or modify a Watts link, Panhard Rod, or Torque Arm -0.5Non-OEM metallic and/or spherical design replacement suspension bushing modifications on control/camber/toe arms/links, panhard rods, watts links, and torque arms (includes replaced, modified, adjustable, or altered control arm ball joints) -0.2Non-OEM shocks/struts with an external reservoir (or piggyback) OR with shaft diameter 40mm or greater -0.7Increase in track width greater than four (4) inches -0.7Conversion from leaf spring or torsion bar to coilover shock springs -0.5Not Applicable

Chassis (ST5-6/TT5-6)*

One or more cage bars that penetrate the front bulkhead/firewall -0.3Not Applicable

Body (ST5/TT5)

Single, Flat, Horizontal Front Splitter (no greater than 4”) -0.5BTM Aero (see 6.1.4) +0.4Modification of the OEM roof line/shape and/or windshield/frame removal (convertibles only) -0.4Modification of the floor pan for exhaust clearance only and/or the rocker panel for side exit exhaust only -0.2Not Applicable

Body (ST6/TT6)

BTM Aero (see 6.1.4) +0.4Modification of the OEM roof line/shape and/or windshield/frame removal (convertibles only) -0.4Modification of the floor pan for exhaust clearance only and/or the rocker panel for side exit exhaust only -0.2Single rear wing or spoiler -1.0Not Applicable

Transmission (ST5-6/TT5-6)*

OEM street-legal model available paddle shift/DCT/SMG or sequential motorcycle gearbox, and all automatic transmissions w/6 gears or more -0.3Not Applicable

Drivetrain (ST5-6/TT5-6)*

AWD -0.5FWD +0.6Rear-Mid or Rear engine layout (not Front-Mid) -0.4RWD

Mod Factor for Specific Models/Items (ST5-6/TT5-6)

Check (ST5-6/TT5-6) rules

Mod Factor Explanation (ST5-6/TT5-6)

Copy from the rules

What Series are You Competing In? (may select multiple)*

Time TrialSuper TouringEndurance Racing

Driver/Team Name*

First NameLast Name

NASA Region*

Email*

Confirmation Email

Year*

Make*

Model*

Car Number*

Car Color*

Multiple ECU Maps?*

NoYes

Describe Switching Method*

Please Upload Dyno Certification Form, Dyno Printout, and 50 RPM vs HP Data Output Table Printout*

Browse Files

This form accepts multiple files. Scanned or a clear picture of each page is OK(pdf, jpg, and jpeg only)

I Certify that I Have Uploaded the Following Mandatory Documents*

Dyno Certification FormDyno Pull Printout - 3 Pulls50 RPM vs HP Data Output Table Printout for Average HP Calculations(When Applicable)

A summary of the form that you can save will be emailed to you upon submission of the worksheet to NASA.

Super Touring and Time Trial

Calculation of Adjusted Weight/Power Ratio (worksheet):

Calculation of Adjusted Weight/Power Ratio (worksheet):

Driver/Team and Car Information