NASA ST/TT Car Classification Form

Super Touring and Time Trial

Car Classification Form 2025 (v5.3)
Change Log:

1/2/2024 - Initial publication. v5.0

12/27/2024 - Updated to include 2025 ST/TT rules. New tires added to +1.0 category. v5.1

1/27/2025 - Added Hoosier RCES to +1.0 tire category. v5.2

5/7/2025 - Added Maxxis VR-2 to +1.0 tire category. v5.3
You must submit a new car classification form for the 2025 competition season!

If you need to edit your current competition season car classification form, please follow the link below for directions.

EDIT MY FORM
What Class do you Want to Compete In?*

ST1/TT1 - 6.00:1ST2/TT2 - 8.00:1ST3/TT3 - 10.00:1ST4/TT4 - 12.00:1ST5/TT5 - 14.50:1ST6/TT6 - 19.00:1
Calculation of Adjusted Weight/Power Ratio (worksheet):

ST1-4/TT1-4
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 or ST4 tire limitations(6.4.1)).
Max Average Horsepower (Max Avg HP)
Calculated
Declared Max Average Horsepower (Max Avg HP)
Calculated (Rounds Fractions Down)
Total Mod Factor
Calculated
Power (ST1-4/TT1-4)*

Manually, mechanically actuated throttle body (no electronic servo) +0.3Not Applicable
Tire Size (ST1/TT1)*

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 (ST2/TT2)*

DOT-approved: NASA Section Width 266mm or smaller +0.6DOT-approved: NASA Section Width 267mm to 282mm +0.3DOT-approved: Tire size printed greater than 315 -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 +0.3Non-DOT-approved: Size greater than 11.8”/300mm/30 cm -0.3Not Applicable
Tire Size (ST3/TT3)*

DOT-approved: NASA Section Width 266mm or smaller +0.6DOT-approved: NASA Section Width 267mm to 282mm +0.3DOT-approved: Tire size printed greater than 315 -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 +0.3Non-DOT-approved: Size greater than 11.8”/300mm/30 cm -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 -0.5BFGoodrich g-Force Rival, Continental Extreme Contact Force, Continental Extreme Contact Sport/EC Sport 02, Cooper RS3-R, Falken Azenis RT615K+, Hankook Ventus RS4, Maxxis Victra RC-1, Maxxis Victra VR-1, Michelin Pilot Sport 4S, NankangAR-1/NS-2R180, Nitto NT01, Toyo Proxes R1R/R888/R888R/RA-1/RR, Valino VR08GP +1.6Bridgestone Potenza RE-71R/RE-71RS, BFGoodrich g-Force Rival S 1.5, Dunlop Direzza ZIII, Falken Azenis RT660, Federal 595 RS-RR, Goodyear Eagle FI SuperCar 3, Hoosier RCES/ Track Attack Pro, Kumho ECSTA V730, Maxxis Victra VR-2, Michelin Pilot Sport Cup 2/2 Connect, Nankang CR-1/CR-S, Nexen Nfera SUR4G, Toyo Proxes R, Yokohama Advan A052/Advan Neova AD09 +1.0Not Applicable
Tire Type (ST3/TT3)*

Non-DOT approved tires -0.7BFGoodrich g-Force Rival, Continental Extreme Contact Force, Continental Extreme Contact Sport/EC Sport 02, Cooper RS3-R, Falken Azenis RT615K+, Hankook Ventus RS4, Maxxis Victra RC-1, Maxxis Victra VR-1, Michelin Pilot Sport 4S, NankangAR-1/NS-2R180, Nitto NT01, Toyo Proxes R1R/R888/R888R/RA-1/RR, Valino VR08GP +1.6Bridgestone Potenza RE-71R/RE-71RS, BFGoodrich g-Force Rival S 1.5, Dunlop Direzza ZIII, Falken Azenis RT660, Federal 595 RS-RR, Goodyear Eagle FI SuperCar 3, Hoosier RCES/ Track Attack Pro, Kumho ECSTA V730, Maxxis Victra VR-2, Michelin Pilot Sport Cup 2/2 Connect, Nankang CR-1/CR-S, Nexen Nfera SUR4G, Toyo Proxes R, Yokohama Advan A052/Advan Neova AD09 +1.0Not Applicable
Tire Type (ST4/TT4)*

BFGoodrich g-Force Rival, Continental Extreme Contact Force, Continental Extreme Contact Sport/EC Sport 02, Cooper RS3-R, Falken Azenis RT615K+, Hankook Ventus RS4, Maxxis Victra RC-1, Maxxis Victra VR-1, Michelin Pilot Sport 4S, NankangAR-1/NS-2R180, Nitto NT01, Toyo Proxes R1R/R888/R888R/RA-1/RR, Valino VR08GP +1.6Bridgestone Potenza RE-71R/RE-71RS, BFGoodrich g-Force Rival S 1.5, Dunlop Direzza ZIII, Falken Azenis RT660, Federal 595 RS-RR, Goodyear Eagle FI SuperCar 3, Hoosier RCES/ Track Attack Pro, Kumho ECSTA V730, Maxxis Victra VR-2, Michelin Pilot Sport Cup 2/2 Connect, Nankang CR-1/CR-S, Nexen Nfera SUR4G, Toyo Proxes R, Yokohama Advan A052/Advan Neova AD09 +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 -2.5Other Non-Production Vehicle -0.4Not Applicable
Chassis (ST2/TT2)*

Sports racers, “Prototypes”, monocoque race cars -3.4Other Non-Production Vehicle -0.4Not Applicable
Chassis (ST3/TT3)*

Non-Production Vehicle -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/TT3)*

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
Production Vehicle Body Modifications (ST4/TT4)*

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 -0.24 to 6 inch front splitter and/or extended undertray -0.3Fender venting and/or wide body fenders -0.3Up to two front bumper canards/ dive planes on each side -0.3Non-OEM rear diffuser -0.3BTM Aero (see 6.3) +0.4Not Applicable
Transmission (ST1-2/TT1-2)*

H pattern to sequential conversion shifter kit (shifter mod only) -0.2Dog-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 (non-synchromesh) -0.5Other OEM street-legal model available paddle shift (ex. SMG), or sequential motorcycle gearbox -0.3All other sequential or 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) +0.6FWD +1.0 (all other)RWD
Drivetrain (ST3/TT3)*

AWD -0.3FWD (non-Production Factory Built Race Car) +0.5FWD +1.0 (all other)RWD
Drivetrain (ST4/TT4)*

AWD -0.5FWD +0.6RWD with solid rear axle +0.3RWD
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
Calculation of Adjusted Weight/Power Ratio (worksheet):

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

Manually, mechanically actuated throttle body (no electronic servo) +0.3Not 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 Force, Continental Extreme Contact Sport/EC Sport 02, Cooper RS3-R, Falken Azenis RT615K+, Hankook Ventus RS4, Maxxis Victra RC-1, Maxxis Victra VR-1, Michelin Pilot Sport 4S, NankangAR-1/NS-2R180, Nitto NT01, Toyo Proxes R1R/R888/R888R/RA-1/RR, Valino VR08GP +1.6Bridgestone Potenza RE-71R/RE-71RS, BFGoodrich g-Force Rival S 1.5, Dunlop Direzza ZIII, Falken Azenis RT660, Federal 595 RS-RR, Goodyear Eagle FI SuperCar 3, Hoosier RCES/ Track Attack Pro, Kumho ECSTA V730, Maxxis Victra VR-2, Michelin Pilot Sport Cup 2/2 Connect, Nankang CR-1/CR-S, Nexen Nfera SUR4G, Toyo Proxes R, Yokohama Advan A052/Advan Neova AD09 +1.0Not Applicable
Brakes (ST5-6/TT5-6)*

Non-OEM, modified or relocated brake calipers/brackets or rotor diameter -0.2OEM (only for OEM) BMW ATE MK60 ABS (non-programmable) -0.2Not Applicable
Suspension (ST5-6/TT5-6)*

Suspension design utilizing upper “A-arm” or “wishbone” type control arms (front or rear) -0.5Replace, modify, or remove control arms, camber arms/links, toe arms/links (Applies only if beyond the allowances of Section 6.1.9.4) -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 element rear wing or spoiler -1.0Single, Flat, Horizontal Front Splitter (no greater than 4”) -1.0Front Air Dam -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 with solid rear axle +0.3RWD
Additional 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
Driver/Team and Car Information
What Series are You Competing In? (may select multiple)*

Time TrialSuper TouringEndurance Racing
Competing as a Team?*

YesNo
The drivers must declare the team for any series before either of the drivers has participated in their first race of the season in that series per NASA's CCR section 22.4.2. Please use >>>Team Declaration Form<<< to do so.
Team Name*
Team Driver 1*

First NameLast Name
Team Driver 2*

First NameLast Name
Driver Name*

First NameLast Name
NASA Region*
Email*

Confirmation EmailConfirm your email in the second box
Year*
Make*
Model*
Car Number*
Car Color*
Multiple ECU Maps?*

NoYes
Forced Induction?*

NoYes
Describe Switching Method*
Tire Brand and Size

Please select tire brand and fill in tire size information into the boxes below.
Tire Brand*
If your brand is not listed, select Other, and fill in below.
Other Tire Brand*
Width*
Ratio*
Diameter*
ECU, Datalogger, and Standalone Boost Controller Information

Please provide ECU/Datalogger/Standalone Boost Controller information in the boxes below.
ECU Make*
ECU Model*
Software Used to Flash ECU*
Using a Datalogger?*

YesNo
Datalogger Make*
Datalogger Model*
Using a Standalone Boost Controller?*

YesNo
Boost Controller Make*
Boost Controller Model*
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) Cancelof
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.
***SUBMIT BUTTON IS DISABLED***

Please check the form for the following possible issues:

1. Manually, mechanically actuated throttle body (no electronic servo)
(Does not apply to forced induction vehicles)

2. DOT-approved: Tire size printed greater than 315 (ST2, ST3 Only) (Does not apply to vehicles with comp. weight over 3750 lbs)

3. Non-DOT-approved: Size greater than 11.8”/300mm/30 cm (ST2, ST3 Only) (Does not apply to vehicles with comp. weight over 3750 lbs)

4. NASA Section Width 257mm or less with MCW greater than 2749 lbs

5. NASA Section Width 226mm or less with MCW between 2400 lbs
and 2749 lbs
Should be Empty:

Super Touring and Time Trial

Calculation of Adjusted Weight/Power Ratio (worksheet):

Calculation of Adjusted Weight/Power Ratio (worksheet):

Driver/Team and Car Information

Tire Brand and Size

ECU, Datalogger, and Standalone Boost Controller Information