Not permitted, not listed in the rules 18 classes
On a closed list an unlisted modification is not permitted. · A.2.2, J.1
IHRA · Ignition
Aftermarket boost sensor, IHRA
IHRA answers this part for 24 of its classes. 2 of those answers permit the part outright and 0 permit it with stated conditions, leaving 22 that do not. 3 of the ones that do not are classes we read as open rather than as refusing it. 22 are inferred from how the class is written rather than quoted from a rule naming this part.
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
- 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
- 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.
Not permitted, not listed in the rules 1 class
DD.7 names no boost sensor and a turbo runs on the original one, so the reading that admits the turbo's own installation leaves an aftermarket sensor closed under the DD preamble. IHRA opens boost sensors in their own clause where it means to (K.5.3, X.4.3). · DD.7
Legal 2 classes
Boost sensors may be modified or replaced with aftermarket components, with no type or range limit, on the forced induction the class allows.
- Ski GP · K.5.3, K.5.1
- Runabout GP · X.4.3, X.4.1
No rule, this is an open class 2 classes
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.
- Drag, Stand Up Unlimited · DD.10
- Drag, Unlimited · DD.6
No rule, this is an open class 1 class
No restriction in section CC, and CC.1 permits any modification it does not restrict.
- Freestyle · CC
Aftermarket boost sensor: 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 2 of 24 answered