Quote:
Originally Posted by mr.asian.m2
i have a 91 stock turbo. can i still put or use the gen 3 ECU? and if i can.. will it make a different?
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no, the 91 usdm is a Gen II, which is air density (has a mass air flow sensor by the intake filter), while the Gen III is speed density, which relies on air temperature and manifold absolute pressure (MAP) sensors. These are completely different running systems, so your car will not run using a Gen III ECU.