Most of these common “chips” also do not alter the turbo boost level either. This generally will give it slightly more power (sometimes NO more power & in some cases will give it LESS power!) & make it use a lot more fuel however most do not monitor throttle position so the ECU will just wind the fuel pressure right up at any throttle pressure – as it thinks that you have your foot flat the whole time. The ECU will then raise the fuel pressure to compensate for this & therefore spray more fuel into the engine cylinders. With mostly well-known rail pressure/untunable “chips” (that are unfortunately very common in the diesel market), generally what happens is that the chip is plugged into your fuel rail pressure sensor circuit, which interferes with the fuel pressure signal to give a false reading to the ECU, to fool it into thinking that the engine has low fuel pressure. LANDCRUISER PRADO 150 SERIES (Low Output).
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