IHRA · Forced induction

Aftermarket intercooler, IHRA

IHRA answers this part for 24 of its classes. 9 of those answers permit the part outright and 0 permit it with stated conditions, leaving 15 that do not. 3 of the ones that do not are classes we read as open rather than as refusing it. 12 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.

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This is one body's answer, not the sport's. You are bound by whichever body sanctions the event you enter. If you race more than one series, build to the stricter answer. The differences are set out in the rulebook comparison.

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

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

Must remain OEM.

• Runabout GP2 · Y.2.4
• Runabout GP3 · Z.2.4

OEM part required 1 class

N.2.4 keeps the intercooler assembly and its fittings as originally equipped, with the rest of the cooling system. · N.2.4

• Four-Stroke Ski Lites

Not permitted, not listed in the rules 8 classes

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

• Runabout Endurance
• Runabout Lites
• Ski GP2
• Drag, Sea-Doo vs Sea-Doo
• Ski 1100 Modified
• Ski 1500 Modified
• Ski GP3
• Ski Limited

Not permitted, not listed in the rules 1 class

DD.7 limits the turbo to a 68mm inducer and names no intercooler, and a turbo runs without one, so reading DD.7 as presupposing the turbo's installation does not open it. Where IHRA allows an intercooler beside a turbo it gives it a clause of its own (K.5.2, X.4.2), and the DD preamble keeps anything unlisted illegal. · DD.7

• Drag, Turbo No Nitrous

Legal 5 classes

Aftermarket intercoolers are permitted, with no size, type or mounting limit stated.

• Drag, Yamaha Pro Stock · DD.1
• Drag, Sea-Doo Pro Stock · DD.2
• Drag, Yamaha Spec · DD.3
• Drag, Sea-Doo Spec · DD.4
• Drag, Super Stock · DD.5

Legal 3 classes

Intercoolers may be modified or replaced with aftermarket units, with no size or type limit, on the forced induction the class allows.

• Ski GP · K.5.2, K.5.1
• Sport GP · V.6.2, V.6.1
• Runabout GP · X.4.2, X.4.1

Legal 1 class

Intercoolers may be aftermarket or modified on four-stroke entries under BB.6.1. · BB.6.1

• Runabout Limited

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

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Aftermarket intercooler: 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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