1. Tuner Category - Engine Control/ECU/Electronics

All the stuff in Sport Category is still allowed. In Tuner, you can reflash the ECU just like you can in Sport Category and add a fuel pressure regulator. For cars 1995 and older, you can now run a standalone ECU, or chip your OE ECU, or add a piggyback.

For forced induction cars, you can run a manual/mechanical boost controller in Tuner Category.

Tuner Category Engine Control/ECU/Electronics - Full Rules

In addition to the Sport Category allowed modifications, the following modifications may be made to Tuner Category ECU/engine controls:

1. For all model years, the following allowances apply:

A. The standard PCM/ECU may be re-programmed without restriction.

B. Fuel pressure regulator(s) may be replaced in lieu of electronic hardware or software alterations. It is not permitted to mechanically alter the fuel pressure regulation AND make other hardware or software changes to engine operation.

C. Ignition timing may be set at any point on factory-adjustable distributor ignition systems.

D. Alternate computer control modules may be used whenever an equivalent change to the conventional system is allowed. For example, alternate computer module control of ignition settings or fuel injection is allowed.

2. 1995 and older vehicles, in addition, may replace the standard PCM/ECU without restriction.
3. Boost may be controlled through a mechanical boost controller.

Sport Category Engine Control/ECU/Electronics - Full Rules

1. OE traction control systems may be electrically disabled, but not removed or altered in any other way.

2. The engine management system parameters and operation of internal combustion engines may be modified only via the methods listed below.

A. OE ECU software may be reprogramed, but no changes to the factory ECU hardware are permitted.

B. Any OE OBD2 or newer communications port functionality must remain.

C. The Check Engine Light (CEL) or Malfunction Indicator Light (MIL) may be disabled via software.

D. Only OE sensors may be used for engine management.

E. Ignition timing may be set at any point on factory adjustable distributor ignition systems.