Time Trial

Welcome to the NASA NE Time Trial information page. This page will be updated as needed, and drivers are responsible for reading this page at least one week before the event. In addition, this page contains links to current event results for drivers to download/view current event results. Please bookmark this page for easy access.

New to TT or NASA?: In order to compete in TT you need to have significant NASA defined Open Passing experience. If you are new to NASA we reserve the right to require an evaluation period and may ask you to sign up for HPDE before allowing you to run TT. Please note that many other organizations’ “open passing” and “Time Trail” groups differ in definition and practice and we want to make sure any new to NASA drivers have proper understanding of our rules and procedures so you and all other drivers can compete in a safe environment. Checkout rides by the TT staff or senior instructors are available for HPDE 3 & 4 drivers to be evaluated for TT. If you are considering TT please complete the TT License Application (do not fill in the box at the bottom) and email it to jsuero@nasane.com.

Time Trial Rules and Forms



Class Forms
You will be required to turn in a hard copy of your Class Form, Dyno Reclass Email, and Dyno Results (including the Certification from Dyno Operator) to the TT Director at your first event. TT Class Forms will be stored in a hard folder for 2021 and on (no more online folders).

Mandatory Meeting
Every Saturday and Sunday morning, we have a Mandatory Meeting (see Event Schedule for meeting time and location). If no location is noted, it is near the Driver Info area. If you miss this meeting you will not be allowed on track until you speak to the TT Director

wristbands will be distributed at this meeting
If you are supersizing from a Race Group, go to your Race Meeting as TT will be there as well and we will cover common information. This meeting may be combined with racers to relay important information.
wristbands will be distributed at this meeting
If you are supersizing from a Race Group, go to your Race Meeting as TT will be there as well and we will cover common information. This meeting may be combined with racers to relay important information.

2022 Season Information: PLEASE register 1 WEEK PRIOR TO EVENT – In addition – You must file NEW 2022 Class Forms regardless of class. A copy of your Class Form (and dyno if applicable) will be handed into the TT Director Jose Suero  by the Mandatory Morning Meeting. You are to keep the originals and keep it with you at the track. Dynos expire if they are > than 3 years old. Note all TT1-TT4 classes require an Avg WHP Dyno (see 9.2 of Rules). The classes will be as follows (please note ratio is not set in stone for lower classes):

  • TTU – Unlimited
  • TT1 – 6.00:1 Average HP
  • TT2 – 8.00:1 Average HP
  • TT3 – 10.00:1 Average HP
  • TT4 – 12.00:1 Average HP
  • TT5 – 14.00:1 Average HP (Points or Dyno Reclass)
  • TT6 – 18.00:1 (Points or Dyno Reclass)

Annual License – Please renew your annual license ASAP so it is on the books and you receive your hard card prior to your first event. If you have a NASA Competition License you can submit this instead. At your first event of the year with this region you must have proof of a license.

Dynos – Dynos are valid for 3 years. A Dyno sheet must be accompanied by the Dyno Cert signed and attested by the Dyno operator and car owner. TT1-6 drivers – PLEASE read carefully the Average Dyno Horsepower calculations in section 9.2.

Dyno Re-class – All Re-classifications EXPIRED JANUARY 31, 2020. See section 8.4 for information on how to submit. Please cc: the Regional TT Director on this request.

The following information comes from an article in SpeedNews 

Introduction to Time Trialing

If you’re thinking about graduating from HPDE to Time Trial (TT), we’ve put this feature together to give you an idea what to expect and help you determine what direction you might want to take. NASA TT provides a venue for spirited on-track competition with a high degree of safety and convenience. NASA TT allows qualified individuals to compete in a “best lap time” format in a prepared car in advanced level open-passing sessions and bridges the gap between NASA HPDE4 and wheel-to-wheel racing.

Class Description

NASA Time Trial is an automobile road course competition series focused on time trial-style competition and shall function as an advertising and marketing tool for the series sponsors, the independent sponsors of each team, as well as the official sanctioning body of the series.

Eligible Makes and Models

Virtually anything from Acura to Volkswagen in race or street trim is eligible to compete in NASA TT. There are the usual classes for internal-combustion-engine cars, and now EVs also have a Time Trial class in NASA.

Donor Prices and Availability

Because you can run anything in NASA TT, donor prices to build a new Time Trial car range from several hundred dollars to several thousand. Daily driven street cars also are eligible to compete in TT. From shop floor to showroom floor, all cars are welcome.

Engine Specs

There are no engine specs, per se, but according to the rules, “the Adjusted Weight/Power Ratio for each vehicle will be calculated based on a simple competition weight to average chassis dynamometer (Dyno) horsepower ratio (Wt/Avg HP), followed by the adjustment of the resulting ratio by adding to, or subtracting from it, based on the list of “Modification Factors.” Competition Weight is defined as the minimum weight of the vehicle, with driver, any time that it competes in a qualifying session or race. Average horsepower calculation (Avg HP) is defined in Section 7.2.”


All vehicle weights will be measured to the tenth of a pound (xxxx.x), and then rounded off to the nearest pound for all calculations. Any weight ending in “.5” (xxxx.5x) NASA Super Touring (ST1-4 & SU) Rules 2020 v14.1 Page 13 of 28 will be rounded up or down to the benefit of the competitor. All horsepower measurements will be rounded off to the nearest whole number, and any number ending in “.50” (xx.50x) or less will be rounded down. Any “Adjusted Weight/Power Ratio” calculation ending in “.995” (xx.995) or greater will be rounded up to the benefit of the competitor.

TT1 = “Adjusted Wt/HP Ratio” equal to, or greater than, 6.00:1

TT2 = “Adjusted Wt/HP Ratio” equal to, or greater than, 8.00:1

TT3 = “Adjusted Wt/HP Ratio” equal to, or greater than, 10.00:1

TT4 = “Adjusted Wt/HP Ratio” equal to, or greater than, 12.00:1

TT5 = “Adjusted Wt/HP Ratio” equal to, or greater than, 14.00:1

TT6 = “Adjusted Wt/HP Ratio” equal to, or greater than, 18.00:1

Fuel Required

Nitrous oxide use is prohibited. Pre-existing tanks must be removed. Methanol/alcohol-water injection is permitted provided that the mixture does not exceed 50% alcohol by volume. Methanol is not permitted as a fuel. (See CCR 15.19 and 18.3)

Average Cost to Build Car

Because the cars in TT are so varied and because some of them are street driven, there really is no average cost. Figure $10,000 to $15,000 for a race-prepped TT5 or TT6 car. From there, prices rise with speed and horsepower.

Average Cost to Buy Built Car

You can buy anything from a used first-generation Spec Miata for $5,000 to a $250,000 prototype. Your budget will determine how fast and powerful a car you get.

Typical Modifications

That’s the beauty of Time Trial. You choose which modifications work best on the car you have chosen to build. The rules allow for freedom and creativity.

Cost Analysis

Average cost to run a weekend — $500 to $1,000

In NASA Time Trial competition, anything goes, from prototype racecars and converted production cars to the current crop of electric cars. Weight-to-horsepower ratios make for fair classes and lots of creative freedom to build the car you want.

Consumables Prices

Tires, size, brand, and prices

Because wheels vary widely with car choice, figure $192 for 205-50-15 Toyo Proxes RRs to $315 for a 275-35-18 Proxes RR.

Brakes, brands and prices

$150 to $250 depending on the car you choose.

Available contingencies

Hawk Performance, Maxxis Tires, Hoosier Tires, Hankook Tires, Spec Clutches, NISMO, Mazda Motorsports.

Factory Participation

NISMO, Mazda Motorsports.


– Build whatever car you want

– Variety of competing cars

– Lots of creative freedom within the rules

– Lots of tire choices available


– Competitive cars can get pricey

– Electric cars are coming on strong!

TTEV (Electric Vehicle) ClassingTT Classification FormsDriver Requirements/LicensingTiming Format
TTEV is an open class for Tesla Model 3, Tesla Model S, Porsche Taycan, and other performance electric motor vehicle models as added in the future. HPDE technical safety inspection rules shall apply. No modifications are permitted to the factory motor, software, EV related safety features, or batteries (other than replacement of the 12-volt lead-acid accessory battery). All vehicles must use either tires with a UTQG treadwear rating of 180 or greater or the Toyo R888R. Note that future additional classing rules and/or Modification Factors may be added (although none are expected for 2020).
In order to accrue points or compete, each year/season, all NASA TT competitors (except TTU competitors) must submit a current year, completed NASA ST/TT Car Classification Form (and certified Dyno report) to the Regional TT Director prior to having lap times count toward competition. Once a form has been submitted during a season, if there are no modifications to the vehicle that would change the form, a new form does not need to be submitted at subsequent competitions.
A NASA TT license can be revoked for a variety of reasons, some of which include: giving false information on the application, failure to comply with the rules, unsafe driving, high incident count (spins/offs), car contact (with objects or other vehicles), and unsportsmanlike conduct on or off the track. Licensed racers participating in NASA TT that commit any of the above infractions may be subject to suspension or permanent ejection from NASA TT competition, as well as revocation of their NASA Competition Race license.
NASA TT competitors will be scored on a basis of their fastest lap time during an event day. Therefore, a regional NASA weekend would generally count as two separate event days, with points and awards for each day. NASA TT competitors will be timed continuously in each designated TT run session that they participate in (which could be a combined HPDE 4/TT run session or a TT-only run session). The sessions are typically between 15 and 30 minutes long. The fastest lap time from all of the sessions will be used as the basis for his/her score for the event. The first run session of the weekend will not count for TT competition and will function as a warm-up practice session. The first session of subsequent days will count toward competition.