Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline
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It makes the engine act like it's under load, rather than just being revved. On a turbo car, you end up getting positive boost pressure from a standstill (something which you don't get when you just rev it)
It'll do the same thing on naturally aspirated car, meaning it launches harder than it would if you held the revs without.
Also, it progressively slips the ignition timing back to how it needs to be, meaning that you don't end up spinning the wheels like a madman because you've got your foot on the floor.
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