UIM · Forced induction
UIM answers this part for 13 of its classes, and publishes no rule for it in 8 more. 0 of those answers permit the part outright and 0 permit it with stated conditions, leaving 13 that do not. 6 are inherited from a parent class the rulebook points at.
UIM requires no boost relief valve anywhere. IJSBA requires an approved one in Ski GP and Sport GP. Do not carry the IJSBA requirement across.
21 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. 6 of them borrow another class’s rules and are marked below; for those, the link to the parent class is read from the categories table rather than stated in the rulebook. 8 publish no rule for this part and name no parent to borrow one from, and are grouped together at the end.
Not legal 6 classes
Only atmospheric engines are eligible, so the class admits no turbocharger or supercharger for this part to serve.
The rules do not say 5 classes
No boost article.
The rules do not say 1 class
The Overboost Control appendix referenced at 502.03.04-09 does not exist in the document.
The rules do not say 1 class
Not stated. The HSR-Benelli figure is a boost limit, not a valve specification.
No rule published for this class 8 classes
No component rules are published for this class and no single parent class is named, so this part cannot be answered for it. That is an absence in the rulebook, not a permission.
Boost relief / overboost control valve: 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.
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Forced induction · four stroke · legal in 0 of 13 answered