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Class Legality

IHRA · Ignition

Aftermarket or standalone ECU, IHRA

IHRA answers this part for 24 of its classes. 9 of those answers permit the part outright and 2 permit it with stated conditions, leaving 13 that do not. 2 of the ones that do not are classes we read as open rather than as refusing it. 4 are inferred from how the class is written rather than quoted from a rule naming this part.

This page is IHRA only, and the bodies do not agree. The same part under IJSBA and UIM. Which one applies to you is decided by whoever sanctions the race you enter.

Where it stands, class by class

24 classes, grouped where the same rule gives the same answer rather than listed one by one, because an answer that holds for a class usually holds for every class that borrows its rules.

What each answer below means

OEM part required
This comes off. Only the part the manufacturer fitted is allowed here.
Not permitted, not listed in the rules
Treat it as coming off. The class requires the craft to stay stock except where the rules allow otherwise, and this part is not on the list, so this is our reading rather than a rule we can quote at you.
Legal, with conditions
Keep it, but measure it: the rules permit this part only inside stated limits.
Legal
Keep it. The rules permit this part in this class.
No rule, this is an open class
Probably keep it. The class carries no stock clause at all, so anything unlisted appears to be open. The rulebook does not say so in terms, and this is our reading rather than a permission anybody wrote down.

OEM part required 2 classes

The original ECU must stay and may only be reprogrammed, with no additional input, output or sensor, so an aftermarket or standalone box is not legal here.

OEM part required 2 classes

The original ECU must stay and may only be reprogrammed, on its original connections, with no input, output or sensor added, so an aftermarket or standalone box is not legal here.

OEM part required 1 class

The original ECU must stay and may only be reprogrammed, though sensors for air fuel ratio, exhaust gas temperature and detonation are permitted for data logging, and an aftermarket or standalone box is not legal here. · W.4.1

OEM part required 1 class

The original ECU must stay and may only be reprogrammed, on its original connectors, with no sensor added, so an aftermarket or standalone box is not legal here. · AA.4.1

OEM part required 1 class

The original ECU must stay and may only be reprogrammed, keeping the same input and output count, with no sensor added, so an aftermarket or standalone box is not legal here. · N.4.1

OEM part required 1 class

The original ECU must stay and may only be reprogrammed, on its own inputs, outputs and connectors, with no sensor added, so an aftermarket or standalone box is not legal here. · L.4.1

OEM part required 1 class

On four-stroke entries the original ECU must stay and may only be reprogrammed, with no additional input or output, so an aftermarket or standalone box is not legal here. · BB.7.1

Not permitted, not listed in the rules 1 class

On a closed list an unlisted modification is not permitted. · A.2.2, J.1

Not permitted, not listed in the rules 1 class

DD.7 does not name the ECU and a turbo runs on the original unit, so the reading that admits the turbo's own installation does not open an aftermarket or standalone box. Every stock-based drag class from DD.1 to DD.5 opens the ECU in words that DD.7 lacks. · DD.7

Legal, with conditions 1 class

No additional inputs, outputs or sensors, and original factory connections. · M.5

Legal, with conditions 1 class

Model-dependent. A four-stroke entry must keep the original ECU, which may only be reprogrammed, so a standalone box is not legal on it (P.1, N.4.1). On a two-stroke entry O.4.1 lets the unit be replaced with an aftermarket one provided no sensor is added, and P.2.5 separately opens the CDI. · N.4.1, O.4.1, P.2.5

Legal 3 classes

The ECU may be reprogrammed, modified or replaced with an aftermarket unit, with no limit on inputs, outputs or sensors stated.

No rule, this is an open class 1 class

No restriction in section CC, and CC.1 permits any modification it does not restrict.

No rule, this is an open class 1 class

The class states only what it bans and calls itself run what you brung, against a section DD preamble that says anything unlisted is illegal.

Aftermarket or standalone ECU: if the rule your class applies reads differently to you, or the rulebook has changed since this was read, ask. We answer with the section we read it from, or that we have not read it. Ask a rules question.

Every IHRA class · where the rulebooks differ · checks on parts the shop sells · how this site reads a rulebook.

Ignition · four stroke · legal in 11 of 24 answered, 2 with conditions

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BaddJet Class Legality