Dyno Re-Classing

8.4.1 National TT Director Assigned Re-Classing

The following rules apply to:

Cars that have:
1) An added, modified, or upgraded turbocharger or supercharger.
2) Non-BTM head(s) or increased number of camshafts (hybrid engines).
3) An engine swap that has been designated as requiring dynamometer testing by the National TT Director (almost all swaps)
4) A Rotary Engine that has been ported.


All other vehicles that have been designated by the National TT Director to be classed based upon dynamometer testing. A driver/owner may submit a request for a Dyno Re-class for a vehicle that does have one of the above four situations that requires one, but it may not be approved. (Note: only NASA members may request a reclassification from the National TT Director)

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.