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Am I insane? Carby B3 W/Weber + Rear Turbo

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  • #31
    Can't use the modern(and technically more efficient) dynamic turbo shaft seals on a draw through, at least not on a traditional draw through. When the throttle is closed/barely open the vacuum will pull oil past the seal and spray it into the engine. I suppose you could work around that somehow, but it won't work in the traditional way of just sticking the carb before the turbo as-is.

    EDIT: When I had my 323 GT I had an idea to make this work. Use an EFI intake mani and TB after the turbo/carb setup. Then take out the throttle plate/s from the carb, and set it up trad draw through. Then use a BOV to reroute the charge pre turbo but post carb. Finally, you'd need a linkage between the EFI TB and the carb throttle shaft lever. This way the turbo never sees vac and the accel pump still works on the carb, but the actual throttling happens at the IM just like in a normal turbo EFI app.

    Make sense?
    Last edited by sketchman; 10-31-2013, 11:06 AM.
    Any difference that makes no difference is no difference.

    Old Blue- New Tricks
    91 Festiva FSM PDF - Dropbox

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    • #32
      Ford did a draw through 2.3 turbo for a few years back around 79-82 or so. It didn't last long for a reason.
      91GL BP/F3A with boost
      13.79 @ 100, 2.2 60' on 8 psi and 155R12's

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      • #33
        Lots of information! My bowl float is already the nyoprene? (something like that lol) black kind. To what I've read, you guys are spot-on.. no intercooler for me, either. Small turbo, max 3-5lbs of boost. I don't want a lot, just enough to say "Mwuaha, I have a Weber and what's that on the back? Oh yeah!"
        Had a guy a few days ago (was checking fluids at a gas station) say, "Is that a Festiva.... with a racing carb?" Cracked me up.



        I'm sure I'd need an electric pump with a turbo setup, so that'll be first.. any idea what pressure pump I'd need for a small turbo?

        Def. going push-through if I do this. That draw-through didn't even have the sexy turbo sounds. :p
        Last edited by Spike; 10-31-2013, 11:00 AM.
        White '92 GL 5-speed BP, G series, Aspire/Rio swapped, "Nancy"
        White '89 LX 5-speed, Aspire swapped, Weber carb
        1988 LX 5-speed
        ​​​1993 L 5-speed B8, E series, Aspire/Rio swapped

        Gone:

        1986 Chevrolet Sprint 1990 L Plus Auto

        Comment


        • #34
          Originally posted by drumnerd33 View Post
          Here is a guy doing it now...
          Old School and Other Rotary - Boost prepping IDA Weber - Im looking to boost prep my 51ida weber (7-10psi max on stock s5 turbo). From what I read I need to do 2 things for sure. 1. Vent the fuel bowl into the carb hat so it sees the equal pressure. (Line from fuel bowl to carb hat area?) 2. Swap the brass float for a...


          Sent from my LG-LS970 using Tapatalk
          Thanks for this! Very usefulz.
          White '92 GL 5-speed BP, G series, Aspire/Rio swapped, "Nancy"
          White '89 LX 5-speed, Aspire swapped, Weber carb
          1988 LX 5-speed
          ​​​1993 L 5-speed B8, E series, Aspire/Rio swapped

          Gone:

          1986 Chevrolet Sprint 1990 L Plus Auto

          Comment


          • #35
            Wideband for tuning will be a must - I think you may need a pressure regulator, enough to overcome boost pressure. If you normally run 5psi fuel then add 5psi boost you'd need 10psi from the pump
            1991 Mercury Capri XR2 "GTXR2" BPT Swapped AWD Conversion

            Rocketchips!
            High Flow B3/B6/BP VAF Adapters for sale!
            Bolt-on Weber Carb Adapters!

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            • #36
              Yezzir. I've been wanting a REAL excuse for wideband, anyway.. Trying to find a cheapish carb hat that looks turbo-ready. Mmm..
              White '92 GL 5-speed BP, G series, Aspire/Rio swapped, "Nancy"
              White '89 LX 5-speed, Aspire swapped, Weber carb
              1988 LX 5-speed
              ​​​1993 L 5-speed B8, E series, Aspire/Rio swapped

              Gone:

              1986 Chevrolet Sprint 1990 L Plus Auto

              Comment


              • #37
                If running low boost you may want to look into rjs supercharger... Easy to mount and no need for intercooler at low boost.

                Sent from my LG-LS970 using Tapatalk

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                • #38
                  Why rear turbo? It don't work
                  -Greg
                  Euro-bprt...WORLDS FASTEST FESTIVA !!! 11.78@115.9
                  BP, G trans, Megasquirt/ 550cc inj. t3/t3 (tbird) Garrett, REAR TURBO!!!! AND AC!!!!
                  Redneck Engineer
                  FOTY - '09
                  5x Festiva Madness Attendee...FM 3,4,5,6,8
                  http://www.youtube.com/watch?v=LpCZ7...9Pwqw-oe8s2OYQ
                  http://www.youtube.com/watch?v=vU_eX...9Pwqw-oe8s2OYQ

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                  • #39
                    I'm seeing that now that I realize what's all involved. Rear-turbo wouldn't work at all. So many tabs open looking at stuff, my brain is on overload hah.
                    White '92 GL 5-speed BP, G series, Aspire/Rio swapped, "Nancy"
                    White '89 LX 5-speed, Aspire swapped, Weber carb
                    1988 LX 5-speed
                    ​​​1993 L 5-speed B8, E series, Aspire/Rio swapped

                    Gone:

                    1986 Chevrolet Sprint 1990 L Plus Auto

                    Comment


                    • #40
                      phew in light of it all I think id just swap a xr2 engine.i know it bragging rights carb and turbo but also sounds like headache lane to me

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                      • #41
                        Draw through carb setup, rear turbo...kaboom maybe? Lol

                        Sent from the trash can.
                        1993 Festiva L "Wendy" BP n' stuff
                        2013 Mazdaspeed 3 "The Kraken" -Stock.

                        Dave Forget

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                        • #42
                          Originally posted by eurotiva View Post
                          Why rear turbo? It don't work
                          Cause its the only way to hit 11s
                          91GL BP/F3A with boost
                          13.79 @ 100, 2.2 60' on 8 psi and 155R12's

                          Comment


                          • #43
                            Originally posted by defprun View Post
                            Draw through carb setup, rear turbo...kaboom maybe? Lol

                            Sent from the trash can.
                            I'd sure have a drag car. Spacerocket fire out the tailpipe and a parachute! Fo sho 10s.
                            Last edited by Spike; 10-31-2013, 01:04 PM.
                            White '92 GL 5-speed BP, G series, Aspire/Rio swapped, "Nancy"
                            White '89 LX 5-speed, Aspire swapped, Weber carb
                            1988 LX 5-speed
                            ​​​1993 L 5-speed B8, E series, Aspire/Rio swapped

                            Gone:

                            1986 Chevrolet Sprint 1990 L Plus Auto

                            Comment


                            • #44
                              Just careeeeeening down the 1/4 mile in a columb of flame!!!

                              Sent from the trash can.
                              1993 Festiva L "Wendy" BP n' stuff
                              2013 Mazdaspeed 3 "The Kraken" -Stock.

                              Dave Forget

                              Comment


                              • #45
                                Anyone know if this is a decent wideband kit?



                                If so, it seems like a pretty decent deal for what's included.. right?
                                Last edited by Spike; 10-31-2013, 01:27 PM.
                                White '92 GL 5-speed BP, G series, Aspire/Rio swapped, "Nancy"
                                White '89 LX 5-speed, Aspire swapped, Weber carb
                                1988 LX 5-speed
                                ​​​1993 L 5-speed B8, E series, Aspire/Rio swapped

                                Gone:

                                1986 Chevrolet Sprint 1990 L Plus Auto

                                Comment

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