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Class Legality

IHRA · Forced induction

Aftermarket turbocharger, IHRA

Held apart from the supercharger because seven of the ten drag classes ban one and allow the other.

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 legal
This comes off. The rules refuse it in this class.
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 1 class

BB.6.1 keeps the impeller housing OEM and BB.4.1 keeps any turbocharger system unmodified, so a turbocharged entry keeps its original unit, and no aftermarket turbocharger is listed. · J.1, BB.4.1, BB.6.1

Legal, with conditions 1 class

Engines of 1100cc or less only, with a water-jacketed housing required, and it may be added to a craft that was naturally aspirated as built. · K.5.1

Legal, with conditions 1 class

Four-stroke entries: Boost regulator mandatory. Water-jacketed housing required. Engines above 1100cc must remain naturally aspirated. Limits: max displacement 1100 cc, boost release psi under 900cc 12, boost release psi 901 to 1100cc 9. · V.6.1

Legal, with conditions 1 class

Watercooled only. No hot headers. Limits: max inducer 68 mm. Read as what DD.7 presupposes, the turbo brings the pipes joining it to the existing intake and its own oil and water feeds, since it cannot run without them. · DD.7

Legal 1 class

Full circulating water-jacket housing required while running. May be added to an originally NA four-stroke. · X.4.1

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 turbocharger: 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.

Forced induction · four stroke · legal in 5 of 24 answered, 3 with conditions

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BaddJet Class Legality