MPFI and SFI

Bruce Plecan nacelp at bright.net
Thu Mar 4 23:06:49 GMT 1999


-----Original Message-----
From: Terrill Yuhas <tyuhas at mail.arl.arizona.edu>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Thursday, March 04, 1999 11:20 AM
Subject: MPFI and SFI

Your terms are so general that I'm lost at what you mean.  Do you want to
change ecms, or
cars?.  If ecms what do you have?.
Bruce


>I was looking at options when it comes time to replace my GM MPFI V6.  The
>newer versions of this V6 are SFI so a couple of thoughts came to mind
>(clearing out the cobwebs).  I also checked in the archives for some extra
>info on the topic but essentially:
>
>- From my understanding, SFI engines use a cam sensor to tell the ECM
>where in the firing order it is so it sounds like most of the differences
>are in the ECM.  Working on that (weak) theory, if one year the engine is
>batch and the next it's sequential, you could drop in the sequential motor
>and run it as MPFI?
>
>- If I read this right in the archives, SFI is more of a driveability
>enhancement than a "power adder" so if it produces 180hp SFI, then it
>should produce the same batch-fired?
>
>Just trying to get my EFI myths and legends straight!
>
>Also, if George Dailey is still on the list I'd appreciate to hearing on
>how his almost similar swap went about two years ago.  There wasn't a
>"closure" post in the archives so I don't know if it ended in utter
>failure or not.
>
>Thanks,
>
>Terrill
>




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