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    #1

    GT30R on a BP, is that crazy?

    Well I have huge plans for the miata. I am picking a BP up next weekend and dropping it off at a machine shop for a fresh rebuild with forged rods and 8.5:1 pistons.
    I am looking for a turbo for it and have found one that will put me around my goal of 400 WHP.

    The GT30R is a customizable BB turbo, it comes with a 56 trim compressor and I have various options on the turbine size. There is a .63, .82 and a 1.06 AR housing option. I want to keep lag to a minimum but wouldn't mind some.
    Should I go with the .82 AR?



    Also, all the GT28R and GT25R turbo's seemed to be for the t25 flange. I'd like to stay with the t3 flange since its not tiny.
    I live my life a quarter pounder at a time. And for those 500 calories or more, I'm free. I need FRIES! Two of them. The big ones. Oh, and I need them tonight. You're lucky the double shot of BBQ sauce didn't blow the seam on your nugget box. There she is, 2 pounds of pure beef. My dad ate it in 9.0 seconds flat. Check it out, it's like this. If I lose, winner takes my happy meal. But if I win, I take the burger and the toy. To some people, that's more important.

    ._________________________
    |.....Overnight....................| ||
    |.....Japan Parts.................| |'|";,___.
    |_..._...____________======||_|_|...,]
    "(@)'(@)""'''''''''''''"'''"**|(@)(@)*****"(@)
    Oh and by the way that shot in your banner with Vin Diesel's car getting shot, thats a civic not an altezza.
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    #2
    doesn't sound that crazy to me. iirc someone put out around 380whp on a vj23 which somebody correct me if i'm wrong, but i think is around the size of a small t3.

    you might want to look into the gt2860rs or the gt2871r. i know the 2860rs's are really popular with the sr20's.
    Last edited by me19875; 11-14-2008, 11:33 PM.
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      #3
      Bob Bundy is running a gt30 in his miata, but he also has the FM 2l stroker kit. He reports more than a fair amount of lag, which will be worse for you if you keep the stock displacement. If you can find gtr style sodium ex. valves, I think they'd be a good thing to have, they might live longer. In any case yeah, lag will be part of your life if you want 400 ponies out of a teeny little engine. But that's what left-foot braking is for.


      380 on a vj23 I think is doable. Pushing it some, but doable, mazda designed that thing to be able to support 30psi so I hear. The gpA rallycars were making much closer to 400 on (basically) that turbo.
      '90 AWD Protege, full GTR drivetrain swap, ~320 whp daily driver, RIP, and
      '90 AWD Protege, yet another GTR swap, Open class rallycar with a Toyota GT4 gearbox swap, thus crossing the line between hobby and mental illness. And a Brabus E55 K8, removing all doubt.
      http://www.wihandyman.com/forum/vbpi...?do=view&g=110
      http://www.cardomain.com/ride/2599486

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        #4
        thats not a bad choices. if you look at my setup i am running a gt30-40 bb turbo. its good for about 600hp and is made to suit a small displacement engine thats looking for large amounts of hp. turbo should build full boost by about 4k.
        GOD INVENTED TURBO LAG TO GIVE THE V8 A CHANCE!!!!!
        AND
        THE DEVIL INVENTED THE ''ANTILAG'' TO SHOW THEM NO MERSEY!!!!

        Comment

          #5
          the 2860's are t25, thats why they're popular with the nissians

          What if I went down to the .64 AR turbine? Would that even be efficient with the larger compressor?

          Originally posted by 13thghost View Post
          thats not a bad choices. if you look at my setup i am running a gt30-40 bb turbo. its good for about 600hp and is made to suit a small displacement engine thats looking for large amounts of hp. turbo should build full boost by about 4k.
          What boost pressure are you running?
          Last edited by wheresthericego; 11-14-2008, 11:44 PM.
          I live my life a quarter pounder at a time. And for those 500 calories or more, I'm free. I need FRIES! Two of them. The big ones. Oh, and I need them tonight. You're lucky the double shot of BBQ sauce didn't blow the seam on your nugget box. There she is, 2 pounds of pure beef. My dad ate it in 9.0 seconds flat. Check it out, it's like this. If I lose, winner takes my happy meal. But if I win, I take the burger and the toy. To some people, that's more important.

          ._________________________
          |.....Overnight....................| ||
          |.....Japan Parts.................| |'|";,___.
          |_..._...____________======||_|_|...,]
          "(@)'(@)""'''''''''''''"'''"**|(@)(@)*****"(@)
          Oh and by the way that shot in your banner with Vin Diesel's car getting shot, thats a civic not an altezza.

          Comment

            #6
            as of now my car is not complete, but i am looking on boosting at the range of 25 psi to 32psi.
            GOD INVENTED TURBO LAG TO GIVE THE V8 A CHANCE!!!!!
            AND
            THE DEVIL INVENTED THE ''ANTILAG'' TO SHOW THEM NO MERSEY!!!!

            Comment

              #7
              I have in my possession a GT3071R with a divided T3 port... my very custom one off manifold is at the welders at the moment and will have it on and running by Spring time.

              25-32psi, on a GT30... wow, you better hope that thing is built up well. Hope you have big enough injectors and all the other things involved to run that thing at that pressure. You gonna be pushing a lot of air which means you're gonna be needing a lot of fuel.

              I'm shooting for 300-400hp too... but I'm gonna start off low psi and work up from there.

              Don't want that funny smell too soon in my car.

              JoN - Automotive Machinist Journeyman/Refrigeration Mechanic Journeyman
              Member of MX-3.com
              1996 Mazda MX-3 RS - Creek Blue Mica
              1993 Mazda MX-3 GS SE - Raspberry... RIP

              Racing BP (Project "Blue" Marlin)... Twin Scroll GT3071R, breaking 30psi at the moment!

              "Do it ONCE, do it RIGHT!"

              Comment

                #8
                I'd stick with the smallest A/R on the GT30. A GT2871 would spool faster but 400whp might be pushing it.

                If you want a good drag car, that's a good ticket but for a more streetable - fun intersection to intersection car, a smaller turbo is better. The VJ23 falls between the GT28 and GT30 size wise. The GT3071 is however quite a bit larger than the VJ23. Expect to fully spool in the 4500-5000RPM territory so have that bottom end fully balanced because you'll be making most of your power in the higher RPMs.

                Comment

                  #9
                  Go to Miataturbo.net and use the search function, then ask questions there too.

                  Chances are, someone's tried it or knows a better way.

                  Also, 400whp in a Miata is ****ing retarded fast.
                  sigpic

                  03 Accord DX: K24/5MT, peasant-spec old man's car
                  92 240SX: KA/T25, nerd mobile

                  Comment

                    #10
                    25-32psi, on a GT30... wow, you better hope that thing is built up well. Hope you have big enough injectors
                    i will be using 750cc injectors for the first stages of the build. when i decide that i am ready to boost higher numbers.i will replace the injectors with 1200cc.
                    GOD INVENTED TURBO LAG TO GIVE THE V8 A CHANCE!!!!!
                    AND
                    THE DEVIL INVENTED THE ''ANTILAG'' TO SHOW THEM NO MERSEY!!!!

                    Comment

                      #11
                      "Also, 400whp in a Miata is ****ing retarded fast."

                      Worth repeating. You really better know your **** driving a 400 hp miata. I'm good enough behind the wheel to be competitive in stage rally at least on a regional level and I find the concept of thrashing a 400 hp miata to be somewhat intimidating. Vastly amusing, and I'd hit it like the angry god fist, but I'd (try to) be ready for wheelspin in the first 4 gears every time the turbo hits the sweet spot...yeeeee haw
                      '90 AWD Protege, full GTR drivetrain swap, ~320 whp daily driver, RIP, and
                      '90 AWD Protege, yet another GTR swap, Open class rallycar with a Toyota GT4 gearbox swap, thus crossing the line between hobby and mental illness. And a Brabus E55 K8, removing all doubt.
                      http://www.wihandyman.com/forum/vbpi...?do=view&g=110
                      http://www.cardomain.com/ride/2599486

                      Comment

                        #12
                        Id suggest picking up a Holset HY35 instead.They are easy to find, cheap, and are very comparable to a GT30R.My buddies almost done with his build on his 1g mx6.Honda guys have no problem spooling em with stock motors, so it should work wonders on your car.
                        93 Escort Wagon V6-SOLD
                        91 Escort Wagon V6-SOLD
                        93 Escort Gt V6-SOLD
                        90 Mazda 323 SE V6-SOLD

                        93 Ford Ranger Splash-Its Baywatch time

                        Comment

                          #13
                          Originally posted by jay View Post
                          "Also, 400whp in a Miata is ****ing retarded fast."

                          Worth repeating. You really better know your **** driving a 400 hp miata. I'm good enough behind the wheel to be competitive in stage rally at least on a regional level and I find the concept of thrashing a 400 hp miata to be somewhat intimidating. Vastly amusing, and I'd hit it like the angry god fist, but I'd (try to) be ready for wheelspin in the first 4 gears every time the turbo hits the sweet spot...yeeeee haw
                          It's true and getting a RWD to break loose in a turn can be a lot more dangerous than a FWD from my limited experience.

                          Comment

                            #14
                            Originally posted by Lex View Post
                            It's true and getting a RWD to break loose in a turn can be a lot more dangerous than a FWD from my limited experience.
                            thats what countersteering, left foot braking, and throttle steering is for

                            it does take a different skill set in a slide from RWD to FWD but both are controllable as long as you know whats going on.
                            "Discontent is the first necessity of progress."
                            -Thomas A. Edison

                            "There is a fine line between ballin' on a budget, and dreamin' on an empty wallet."


                            *Junked* 92 mx3, BP swap- milage whore, beaten up and down the east coast
                            *Junked* KLZE powered 323 on Megasquirt 1
                            172.60HP & 156.93 TQ with only headers and short ram intake. back under the knife for a BPT swap.
                            New Daily stock 1.6L 1999 Mazda Protege LX

                            Comment

                              #15
                              rwd is definitely more difficult/dangerous though.

                              i agree, holsets are a great option. you can get a brand new one for less than what you'd pay for a used GT series turbo
                              Escort GTR -- 11.87 @ 117.6 mph -- 320 HP / 325 Ft. Lbs. @ 23 PSI
                              ... The first FWD BG with a Toyota E153 transmission conversion in the USA!
                              Looking for BP x Toyota E153 adapter plates? PM me or contact me on Facebook: Riel Performance Parts

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