IJSBA · Forced induction

Aftermarket intercooler, IJSBA

The single cleanest Runabout Stock vs Limited discriminator.

This page is IJSBA only, and the bodies do not agree. The same part under IHRA 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

14 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.

OEM part required 1 class

Intercooler assembly/housing replacement prohibited. · RRL.3.5

• Runabout Rec Lites

OEM part required 1 class

Intercooler assembly and housing must remain OEM.

• Four Stroke Ski Lites · FSKL

OEM part required 1 class

No intercooler change is listed, and on a craft with factory forced induction the turbocharger or supercharger system may not be modified at all, so the intercooler stays as supplied. · RNA.1.1, RNA.5.1

• Runabout Naturally Aspirated

OEM part required 1 class

MUST REMAIN OEM. · RAS.3.6

• Runabout Stock

Not permitted, not listed in the rules 4 classes

Not listed in this class document. Illegal under the closed-list principle.

• Fixed Steering Ski Stock · FSSK
• Ski Stock · SSK
• Ski Modified · SKM
• Ski Superstock · SKSS

Legal 4 classes

The intercooler may be modified or aftermarket.

• Freestyle · FREST.9.2
• Ski Grand Prix · SKGP.9.2
• Sport GP · SPGP.9.3
• Runabout Open / GP · ROP.8.2

Legal 1 class

Intercoolers may be modified or aftermarket. Mechanical intercooler pressure relief valves permitted. · RAL.5.1, RAL.3.6

• Runabout Limited

Legal 1 class

RSS.6.2. Note the internal tension with RSS.3.5, which asks for the OEM intercooler housing for water-supply purposes.

• Runabout Superstock · RSS

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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.

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