[Gmecm] Looking for MPI/Conversion information for GM 454 CubicInch Engine

[David Allen]

Adrian, glad you're considering an EFI retrofit!

One major thing to watch for, is buying all parts from the same donor vehicle. I've run into issues with imcompatible parts, missing small items, and various other 'gotcha' issues when the donor vehicle is not available, or parts have been ordered from here and there. 

Have you considered a TBI?  It is mosty the same, electronically; but the unit is simpler to install. I know for fact there are 454 TBI manifolds, but I haven't seen a 454 MPFI manifold. 

You could easily bolt on a TBI manifold and wire everything up and it would run without any real headaches.

If you want multipoint injectors "just beacause" (which is fine here!), the electrical install will be basically the same; but you may have to build a fuel rail, drill the manifold, and of course the tune will be a completely custom job.

Sincerely
David

  ----- Original Message ----- 
  From: Adrian Flynn 
  To: Gmecm at diy-efi.org 
  Sent: Tuesday, September 13, 2011 2:27 PM
  Subject: [Gmecm] Looking for MPI/Conversion information for GM 454 CubicInch Engine


  September 13, 2011
  Hello to everyone,

  I have been setting in the background reading the posts and trying to make sense out of them.
  I am about to get my feet wet (as it were) with my 1973 3/4 ton Suburban. 4X2

  What I want to do is add Multi port Injection in place of the Carter/Edelbrock Carburetor that is currently powering it.

  I would like some pointers in the right direction as to what I will need to do to accomplish this.

  What I would like to do is acquire a complete GM system from a junkyard 454 (Yeah I know Headaches),
  My main reason for doing this is that I am living on a Disability income and don't really have the coins to 
  buy a NEW unit.

  Electronics was my lively hood for over 35 years as a repairman of TV's, Stereos, Microwaves ETC;
  so computers and such do not bother me and I have the tools for servicing them.
  Only thing I do not have is Scan Tools for Automotive Computers, OBD_I & II etc.

  I know this is reinventing the wheel but I hope to be able to get the information I need to do this., and what pitfalls to avoid

  The Suburban is a factory 454 with the turbo 400 Transmission, it is equipped with long tube headers, dual 2 1/2 inch cherry bomb exhaust.
  I will be upgrading the Transmission to a 700R or 4L60 in about a year or so.

  The Suburban does not have a Cat on it (Missing when I bought it in AZ) but don't mind putting one on if need be for best usage.

  My goal is best fuel mileage possible, with maximum low end torque.
  I WILL NOT BE RACING IT!
  I may be towing with it from time to time a trailer that grosses out at 12,000 lbs.

  I use to have a 25' Sports Coach on a GM Chassis with the 454 and I averaged 15 MPG when I was not towing a Ford E150 behind it, with the E150 I averaged 10 MPG.


  OK, I probably have bored you enough but I like to try to fill in the basics of what I have and plan to do when asking questions like this.

  I thank you for your time.

  Adrian Flynn KF7DYU




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