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What is the cost of routing gas the long way round the turbocharger?

  • A.Hotter gas, which is taken directly from the exhaust manifold before it has passed through the turbine
  • B.None
  • C.Transport delay through the long path and the compressor, which makes transient control considerably harder
  • D.A slower response because of the long path

Answer: D

The long path introduces a delay that complicates transient control. The last option explains exactly that difficulty, which makes it a correct and more instructive version. Many engines use both routes. The order in which the effects act is what decides the outcome, so it is worth establishing first. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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