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  • 2 wastgates

    I am sure someone asked this, but I din't see it when I searched. Can I use an internal and external wastegate as a back up? pretty simple.
    sigpic

  • #2
    no need to.
    sigpic
    2005 Legacy GT
    2004 Vue V6 AWD
    1995 SL1

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    • #3
      Originally posted by brentg
      no need to.
      Internal wastegates never break?
      - Justin [s]99 Blue SL2 - T3/T4 14psi[/s] (dead)


      FS: Pimped lower trans mount, TiAL 38mm Wastegate, Gauge Cluster, Oil Drain

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      • #4
        that's not what he means

        you're better off going external than internal or internal and external combined
        -Vinny

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        • #5
          but say he has a turbo with an internal gate, and a nice manifold that already has an external gate attached to it.

          Would it be worth buying a new turbo or even modifying the other?


          Or just run both gates.

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          • #6
            you usually can take off the internal wastegate and run and external ifyour manifold has one. otherwise, plug off the ex. port and use the internal. internal external internal external.. confused? lol
            sigpic
            2005 Legacy GT
            2004 Vue V6 AWD
            1995 SL1

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            • #7
              yeah confusing indeed, I will run with the internal since I expect low boost with a target of 190-200hp. Enough to getup and roll, I am still waiting for the turbo to get here, so I may do as recommended and remove it and go external, will see
              sigpic

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              • #8
                if you have the external, use it. itll flow way better than the internal, which will help boost response. plus youll be able to run lower boost with the external (i think anyway) cuz you can change the spring easier. im assuming your turbo has the somewwhat porkchop shaped 5 bolt flange... they make internal delete flanges for them.


                Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut. -Ernest Hemingway

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                • #9
                  Internal gates are adjustable from about 3-4 to whatever the gate is rated at.

                  Its just a PITA to get it at the proper setting sometimes.

                  Oh and they like to flutter the flapper too. Right now my car makes 7-9psi, and its annoying watching the gauge flutter back and forth.
                  07 Redline w/ stuff.<br /><br />89 Civic hatch w/o stuff.<br /><br />96 SL2 that dont need stuff.

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                  • #10
                    internal is going to probably be more reliable then a external. factory garrett actuators are used on just about everything that is turbo from the factory. if externals where more relibable, they would use them. there are some factory cars that do come with externals, but they are rare. personally, i think they would last longer due to the fact that the actuator diaphram is usually placed a significant distance away from the turbine houing. this keeps it away from heat, which is usually the cause of spring and diaphram failure.

                    external's arn't really needed due to factory ecu's being able to compensate for boost creep and spikes. while internals are more reliable, they are not going to control boost as accuratly as a external. if they spike, who cares, the factory tunes for it. not to mention, they arn't really running that much boost in the first place usually. if a factory turbo spikes too 9 instead of the target of 7, its not an issue.

                    externals are better for aftermarket use, because control is a lot more important. with an aftermarket setup on a n/a car, most people tune to a specific boost level, so the margin for error has to be considerably smaller. if you spike to 26psi when your shooting for 20psi, that could be a big no no. aftermarket systems have to be precise in most cases, so using a larger external gate will help you. most run on the raged edge of pump gas, so spikes or creeps can be detrimental.

                    external gates are less prone to spiking and creeping primarly due to the size of the port. they can be just as crappy as an internal, if it has a small port and/or poor manifold placement. externals have bigger ports usually and the reason this works better is because they can expell more exhaust gas.

                    if i were in your shoes. i would just run the internal gate. if all your looking for is about 200whp, your going to need about 7 psi. your not going to need a bigger gate for that amount of power, so there is no sense making things more complicated. the internal is already installed and ready to rock. adding another wastegate or strictly using the external will require a port on the manifold, which usually costs more money. complicating a system more then it needs to be usually ends with more problems.

                    if your going for more power in the future, but sticking with the same turbo and manifold, you might want to go with the external. more then likely you'll need to run more boost then the internal gate will handle to get more power.

                    remember to "keep it simple stupid!"
                    http://www.alphatuning.com

                    Give it a Like! Alpha Tuning on Facebook

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                    • #11
                      You are so hot right now mike.
                      -teb

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                      • #12
                        I'm glad I just read that whole thing.
                        sigpic

                        2002 SL Sport - Totaled by Negligent Driver
                        1995 Miata Flared Turbo R Package - Rest In Pieces.
                        1999 Miata Brilliant Black - The Daily

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