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Greg G.

Dyno Re-classing & Engine Swaps--and how to get them classed

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Greg G.

8.4.2 Re-class Request Procedures


An owner/driver must submit the following information, by e-mail, to the National TT Director (greg@nasa-tt.com), in order to request a Re-classification and new Base Class, before the vehicle can enter competition if the Re-class is required as designated in 8.4.1 above

(See Appendix C for the few pre-approved Dyno Re-classes):


1) Your name, NASA home region, and series (PT, TT, or both)

2) Competition vehicle--year, make, model, subtype and trim type (if applicable)

3) Reason for the request (FI, swap, heads, rotary porting, hybrid, not required, etc.)

4) Actual measured Displacement, and if a swap: Engine--model #/name, disp, #cyl,

valvetrain/VVT?, F/I?, OEM crank Hp & Tq.

5) Dynojet dynamometer maximum Hp and Tq (if AWD, then Dynojet, Dynopack, Mustang, or

Dyno Dynamics dyno numbers)

6) Amount of extra Hp requested for "Dyno Variance" (1-3% recommended over above max Hp)

7) Minimum Competition Weight (with driver)


Or, an owner/driver can submit 1-6 above, along with:

7) The specific requested new base class, including number of asterisks (7 points each),

instead of the vehicle weight. The new Minimum Competition Weight will then be provided in the Official Re-class e-mail response.


The extra Hp requested in 6) above, is to help ensure that any Dyno testing done at another location or at the track by the TT Officials will show hp ratings equal to or less than those provided by the owner/driver.


Once a vehicle is re-classed based on Dyno testing and Minimum Competition Weight, an Official Re-class e-mail will be sent to the competitor, stating the new base class, the new base tire size, and the maximum Dyno horsepower and Minimum Competition Weight limits, as well as any other specific limitations for that particular re-classification. The new base tire size will match the new base class. The competitor will then complete the TT Car Classification Form, but will not assess any points for Section 8.3.B (Weight Reduction) or 8.3.C (Engine). Modification Points will be assessed for all other non-BTM modifications. The competitor must not exceed the limits of either power or weight listed in the Dyno Re-class e-mail in order to prevent disqualification. If the vehicle is modified, and the power level or weight has changed, a new request for Re-class must be sent to the National TT Director.

Edited by Guest

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Nick325xiT 5spd

What is the turn around time on a request e-mail? I sent a couple in a while ago and am still wondering.



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Greg G.



Good question.


The turnaround time varies depending on the number of requests in the queue, the number of reply e-mails sent back when a re-class has been sent, as well as the number of NASA issues that need to take precedence, like protests, Technical Bulletin issues, activities at the track, etc. The time varies from a few hours to a few weeks. You will be receiving an e-mail within the next hour, though.


We try to get them done as quickly as possible. This past month, there were over 100 e-mail requests at one point in the queue, and then we had all of the Technical Bulletin issues that took up a lot of time.



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Just joined NASA, found this extremely helpful to narrow down what/how to submit. Thank you for posting it up!

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