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Mazda BP-Z3 turbo selection

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    Mazda BP-Z3 turbo selection

    Hey guys, while I'd still like to squeeze as much time out of the homo-mobile as possible with it N/A, realistically I will be adding a snail in ~ 12 months so I'd like to start piecing together bits.

    The motor is a 2003 VVT Mazda BP-Z3, so 10:1 compression. The requirements are as follows:

    * internally standard motor
    * max of 250rwhp only
    * must be budget friendly
    * must be reliable (as in circuit reliable)
    * must be snappy with a decent power bound

    Currently I am thinking an OEM Nissan S15 T28 would probably fit the bill. I'd like to limit boost to no more than 15psi. I'd prefer to keep it on 98, however if there's significant reliability to be had on E85 I'd run 2 boost settings & flex fuel. I'm looking to run the Nitro Dann manifold and dump pipe, Haltech Elite 750 with plug 'n' play adaptor, Inconel studs, generic intercooler, upgraded radiator and some bonnet venting.

    I'm not interested in big power options, the whole idea of this car is cheap fun, once gearboxes need to be factored in there's just too much scope creep. And a 1000kg car with a real 220-250rwhp should be plenty quick for a circuit thrasher. Heat management/reliability is a big concern too. The car will end up being used in endurance events, ideally no more than 15psi.

    Is there any other turbos I should be considering?
    Rust is lighter than carbon fibre.

    My Italian 510

    #2
    When you decide on turbos and if you go the T28 I have a few lying around that won't be doing anything now that Prod Sports changed the rules for turbo cars.

    Comment


      #3
      Easy done with a t28rs
      Did it on about 14psi on a unopened bpt

      Comment


        #4
        GT28RS will work a treat.

        Look at the Kraken manifolds over the Dann ones.

        Rods will probably go first.
        Chris
        ------
        The MX5 Noujet (its up market) | The Hilux Complete Nugget
        I never saw a wild thing sorry for itself. A small bird will drop frozen dead from a bough without ever having felt sorry for itself. - D.H.Lawrence

        Comment


          #5
          At what point to rods go?
          Rust is lighter than carbon fibre.

          My Italian 510

          Comment


            #6
            On a bpt over 250hp is getting close.

            Comment


              #7
              Yeah, consensus is around 250hp. After rods then generally oil pump is the next weakest link.

              Pistons have been known to go with far less though, although that is probably tuning issues.
              Chris
              ------
              The MX5 Noujet (its up market) | The Hilux Complete Nugget
              I never saw a wild thing sorry for itself. A small bird will drop frozen dead from a bough without ever having felt sorry for itself. - D.H.Lawrence

              Comment


                #8
                I'd have though revs would be a greater killer than boost?

                So looks like my ultimate power target is the upper limit. It all depends on what the thing actually makes, but maybe something like 10psi on 98, 15 on e85.
                Rust is lighter than carbon fibre.

                My Italian 510

                Comment


                  #9
                  Originally posted by Guido View Post
                  I'd have though revs would be a greater killer than boost?

                  So looks like my ultimate power target is the upper limit. It all depends on what the thing actually makes, but maybe something like 10psi on 98, 15 on e85.
                  ---
                  Shed Project: 1994 Laser Lynx with BP-T

                  Comment


                    #10
                    This.

                    If you are taking the engine apart then rods pistons and a billet oil pump are cheap.
                    Chris
                    ------
                    The MX5 Noujet (its up market) | The Hilux Complete Nugget
                    I never saw a wild thing sorry for itself. A small bird will drop frozen dead from a bough without ever having felt sorry for itself. - D.H.Lawrence

                    Comment


                      #11
                      ---
                      Shed Project: 1994 Laser Lynx with BP-T

                      Comment


                        #12
                        Ok cool, cheers. The limiting to 250hp max bit was to keep the 6 speed intact. I'm very mindful of the fact this car is meant to be cheap and reliable. The current motor is quite strong, so I guess its just a case of me not getting greedy.
                        Rust is lighter than carbon fibre.

                        My Italian 510

                        Comment


                          #13
                          Originally posted by Guido View Post
                          Ok cool, cheers. The limiting to 250hp max bit was to keep the 6 speed intact. I'm very mindful of the fact this car is meant to be cheap and reliable. The current motor is quite strong, so I guess its just a case of me not getting greedy.
                          ---
                          Shed Project: 1994 Laser Lynx with BP-T

                          Comment


                            #14
                            Quite a few BP4W + turbo failures around 250hp though with decent tuning. I would peg it as the roughly average rod failure point.
                            Chris
                            ------
                            The MX5 Noujet (its up market) | The Hilux Complete Nugget
                            I never saw a wild thing sorry for itself. A small bird will drop frozen dead from a bough without ever having felt sorry for itself. - D.H.Lawrence

                            Comment

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