Quote:
Originally Posted by subzero05
a properly designed and engineered piggy back unit will never "defeat" the "pre-set" factory limitations set by the ECU. What is "sees and records" never changes. at WOT for example there are preset boost "limits" the ECU will expect to see. while a piggy back unit may alter the "signal" being sent from the sensor connections, the ECU itself still only "sees" those limits, therefore nothing is actually ever changed from stock. However in case of the JB4 unit for example, if you plug into the OBDII port , it can leave a fingerprint trace that something was altered if any changes are done thru it. Just trying to give some additional info on how they work etc.
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Agree. By design the factory ECU will never see a reading beyond max, the man in the middle attack which is a piggy fakes the results. Sort of like putting a device between your speedometer and the sensor that causes it to read lower. The speedo will say 70mph when in fact you are doing 77mph. The only way might be if the car had additional sensors outside of the piggy that could tell the boost was outside parameters etc.
Noushy