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    Throttle body fuel injection

    Hi all, new to the forum (2nd time) but not Stags, had mine since 1985 and now restoring.

    I am looking at fitting EFI and wondered if anybody already done it?

    Cheers, Ron



    #2
    Welcome back. A number of us have fitted Multipoint EFI as it offers better performance as well as drivability and economy. Single point (throttle body injection) offers marginal performance advantage as it uses the existing restrictive inlet manifold. EFI installation is complex, extra fuel pump, return lines, sensors, ECU,wiring loom, possibly crank sensors and mapped ignition. Multipoint is the way to go which is why all car makers have dropped the single point injection. Stagdadís Multipoint kits will be the system to use.

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      #3
      I have just today got my 4th Stag engine running on efi.

      They are all multi point systems using home built inlet manifolds, two on full engine management, two on ex Rover SD1 injectors and electrics and original distributors (like the one I am currently working on)

      I have also run a couple of Stag engines on systems retaining the original inlet manifold although these were also multi point systems, but to be honest apart from losing the choke there was nothing to be gained over a good carb set up hence the move to fabricated inlet manifolds.

      Neil
      Neil
      TV8, efi, fast road cams and home built manifolds. 246bhp 220lbft torque

      Comment


        #4
        Originally posted by KOY 23 View Post
        Welcome back. A number of us have fitted Multipoint EFI as it offers better performance as well as drivability and economy. Single point (throttle body injection) offers marginal performance advantage as it uses the existing restrictive inlet manifold. EFI installation is complex, extra fuel pump, return lines, sensors, ECU,wiring loom, possibly crank sensors and mapped ignition. Multipoint is the way to go which is why all car makers have dropped the single point injection. Stagdadís Multipoint kits will be the system to use.
        Bit early for April fools John. A kit of that complexity and fabrication time scale just wouldn't be viable. Totally agree if you are going to put the effort in to fit all the other bits don't stop short by using the old inlet manifold.
        Last edited by Stagdad; 6th January 2019, 09:06.
        Carbs suck.

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          #5
          My project has been going on for too many years and I keep on getting distracted by other cars!
          Mike.
          74 Stag (Best Modified 2007), 02 Maserati 4200, 17 BMW M140i, 00 Mitsubishi Pinin

          Comment


            #6
            Originally posted by mjheathcote View Post
            My project has been going on for too many years and I keep on getting distracted by other cars!
            New year's resolution Mike
            Carbs suck.

            Comment


              #7
              Thanks for the feedback. The reason I asked about the throttle body is because I read about someone fitting it in the SOC magazine but can't find it now. Another factor is that these come relatively cheaply to me because I import containers full of customers parts from the USA about every two months so I have no shipping cost.

              Another factor is I have five 67/68 Mustang fastbacks in various stages of restoration from just starting to just finished and if it didn't work on the Stag I could put it on one of these.

              We are around 70% along the way with my Stag restoration. My wife wants to be using it almost as a daily so I have converted it from manual to auto (I can hear the groans now) and I will fit EFI of some description. It won't be sold, I have had it nearly 34 years!

              Cheers, Ron


              Comment


                #8
                If you are just after drivability, the Patton machine TBI replacement for the Strombergs may be ideal for you and itís proven and US sourced.

                Comment


                  #9
                  Originally posted by mjheathcote View Post
                  My project has been going on for too many years and I keep on getting distracted by other cars!
                  thats a beautiful piece of work Mike - stop getting distracted!
                  Mike

                  Comment


                    #10
                    Originally posted by mike@thenook View Post

                    thats a beautiful piece of work Mike - stop getting distracted!
                    I'll try!
                    I'm surprised no one else has had a go with the individual throttle bodies, however to be fair it isn't the easiest conversion to EFI and fabricating/machining the individual manifolds was really hard!
                    I keep walking past it in my garage and still stop and spend some time trying to work out the best way of completing the throttle linkage to all 8 throttle bodies.
                    I've found an Australian company that specialises in EFI components and I do need to get on and order a few things for the linkages.
                    Last few years has been difficult, my youngest (9) been seriously ill in 2017 (Okay now presently), and myself moving job early last year, has taken off the focus a bit, and a couple of new cars to the stable too!
                    Mike.
                    74 Stag (Best Modified 2007), 02 Maserati 4200, 17 BMW M140i, 00 Mitsubishi Pinin

                    Comment


                      #11
                      Really sorry to hear about your son Mike, there is no way you can think straight with such problems overhead but pleased he is now well....l

                      Maybe, hopefully 2019 will be the year to get it all finished!
                      Mike

                      Comment


                        #12
                        Originally posted by mjheathcote View Post

                        I'll try!
                        I'm surprised no one else has had a go with the individual throttle bodies, however to be fair it isn't the easiest conversion to EFI and fabricating/machining the individual manifolds was really hard!
                        I keep walking past it in my garage and still stop and spend some time trying to work out the best way of completing the throttle linkage to all 8 throttle bodies.
                        I've found an Australian company that specialises in EFI components and I do need to get on and order a few things for the linkages.
                        Last few years has been difficult, my youngest (9) been seriously ill in 2017 (Okay now presently), and myself moving job early last year, has taken off the focus a bit, and a couple of new cars to the stable too!
                        Mike,

                        Whilst researching for another project, I came across this linkage kit on the Jenvey website - any use, or at least does it spark any ideas?

                        https://store.jenvey.co.uk/throttle-...33mm-xx-owk1xx
                        Last edited by Carboy0; 8th January 2019, 08:24.
                        Chris

                        Comment


                          #13
                          Anyone using Stagweber setup ??

                          Seems to have been taken off of Flebay too
                          Last edited by malc4d; 9th January 2019, 14:23.

                          Comment


                            #14
                            Originally posted by malc4d View Post
                            Anyone using Stagweber setup ??
                            As far as I can tell there is no Stagweber setup? I see Chris has put some very scant details on facebook but that's about as far as it seems to have gone so far - nothing on his website where you would expect him to be advertising it, if it was anywhere near ready
                            Paul - 3 projects, 1 breaker - garage built and housing 2 white Stags. One runs, one doesn't

                            Comment


                              #15
                              Originally posted by Carboy0 View Post

                              Mike,

                              Whilst researching for another project, I came across this linkage kit on the Jenvey website - any use, or at least does it spark any ideas?

                              https://store.jenvey.co.uk/throttle-...33mm-xx-owk1xx
                              Thanks, can't easily do that unfortunately.
                              Looking at one of these https://www.efihardware.com/products...ring-Tensioner and then adjustable rod linkages to both banks.

                              Then for airbox, a pair of these https://www.thepipercrossshop.co.uk/..._p23378572.htm one per bank.

                              The other option, a pair of these https://www.thepipercrossshop.co.uk/..._p23378558.htm and cut the bonnet with two slots.
                              I bought a spare bonnet years ago in case subtle mods are necessary!
                              Last edited by mjheathcote; 8th January 2019, 18:18.
                              Mike.
                              74 Stag (Best Modified 2007), 02 Maserati 4200, 17 BMW M140i, 00 Mitsubishi Pinin

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