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turbo charger and super charger are close to the same thing just ones belt driven and other is powered by the exhaust the turbo is always spinning even at idle but most turbo on car will kick in about 1k rpm depending on how hard you push the gas pedal down will determine how fast the turbo will produce more boost (turbo's are always spinning its just the waste gate that close when the engine loses vacuum(hitting the gas harder)once it lose vacuum the valve closes keeping all the boost in the intake) i know on my supra i produce boost at 900 rpm's and will be at max 15psi boost at around 2k rpm's

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15y ago
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Q: How long does it take for a turbocharger to kick in?
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