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Limp mode is when your turbo charger exceeds the boost limit set by the ECU, usually around 16psi. When it does the car will simply not go, and you have to take your foot off the go pedal and back on again for limp mode to disappear. Turbo lag is, in a nutshell, the time between your turbo basically sitting there at its lowest rpm, (saying when your idle at the lights) and its maximum rpm (when you put the foot down and take off from the lights). If this time is too great, you experience sluggishness then you will feel the turbo start to kick in and get the car going. If you have a boost gauge you can see it. The needle will rise really slow to reach the maximum boost level.
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