Forced Induction
All Applications: Restricted to a single turbocharger. All air entering the turbocharger must pass through the turbocharger inlet. Injection of any liquid, gas, or any other substance into the inlet or exhaust housing is prohibited. Turbocharger compressor wheel must be constructed of cast or billet aluminum. Exotic material wheels prohibited. Liquid intercoolers limited to water and/or ice ONLY.
Four-cylinder, single-turbo application: limited to maximum 88mm turbo, where the maximum compressor housing inducer diameter is 89.5mm (3.523 inches), measured at the point where the leading edge of the compressor wheel meets the housing. Compressor wheel inducer diameter not to exceed this value, and contours of wheel must not be "stepped, notched, or clipped"; i.e., the contours must be continuous features from the inducer to the wheel exducer. All air entering the turbocharger must pass through the turbocharger inlet. Injection of any liquid, gas, or any other substance into the inlet or exhaust housing is prohibited. Turbocharger compressor wheel must be constructed of cast or billet aluminum. Exotic material wheels prohibited.
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“One might get the impression that I recommend a new methodology which replaces induction by counterinduction and uses a multiplicity of theories, metaphysical views, fairy tales, instead of the customary pair theory/observation. This impression would certainly be mistaken. My intention is not to replace one set of general rules by another such set: my intention is rather to convince the reader that all methodologies, even the most obvious ones, have their limits.”
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