Guest subarugsr Posted August 12, 2003 Share Posted August 12, 2003 i am familiar with the workings of mpfi, but is anyone able to explain or diagramitcally show me wat and how SPFI works? Link to comment Share on other sites More sharing options...
Guest Skip Posted August 12, 2003 Share Posted August 12, 2003 They both operate basicly the same when warm they are in closed loop ECU watches the 02 sensor output and adjusts the pulse width duration to tries to achieve a stoichiometric A/F ratio. Only diff is the SPFI has one big injector the MPFI has four (two operate simlu so it's not a true "sequential" system, it's called a "batch" system) Hope this helps Link to comment Share on other sites More sharing options...
Guest oobnuker Posted August 12, 2003 Share Posted August 12, 2003 SPFI is basically a glorified carb. It is a single injector, mounted in a throttle body that resembles a traditional carb. There are a lot of electronics involved still, but not as much as an MPFI or Turbo setup. Hope this helps. Link to comment Share on other sites More sharing options...
Guest jon61484 Posted August 12, 2003 Share Posted August 12, 2003 SPFI: single port fuel injected (like what he described.) MPFI: multi port fuel injected (one injector in each cylinder) and yeah, the SPFI was designed as a replacement for a carburated car. (Fords, Chevys, have single port fuel injector setups that can work right onto the small block manifolds) Link to comment Share on other sites More sharing options...
Guest subarugsr Posted August 13, 2003 Share Posted August 13, 2003 i am considering shoving a turbo on an EA71, if i adapted the manifold for a SPFI unit to fit, added computers etc, it would work? Link to comment Share on other sites More sharing options...
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