In the past my car occasionally makes a odd rapid clicking noise when approaching around 29psi. It only does it sometimes and stops whenever you let off the gas but when the clicking noise does happen some puffs of black smoke come out the exhaust (no cat) I never really worried about it until I thought it might be something like predetination or something like that.
Anyone know what it is? i thought it might be the waste-gate opening and closing very quickly or something but i dont know.