712750, 715750-COBB 3-PORT ELECTRONIC BOOST CONTROL SOLENOID

Owned by Chris Mitchell
Last updated: Oct 06, 2021 by Brandyn Mowat
11 min read

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712750, 715750

COBB 3-PORT ELECTRONIC BOOST CONTROL SOLENOID



 
Congratulations on your purchase of the COBB Tuning 3-Port Electronic Boost Control Solenoid! The following instructions will assist you through your installation process. Please read them first BEFORE beginning the install and familiarize yourself with the steps and tools needed. If you feel that you cannot properly perform this installation, we HIGHLY recommend you take the vehicle to a qualified and experienced automotive technician.

Warning! The installation of this 3-port solenoid requires proper tuning. The use of a COBB OTS map designed for a stock solenoid, with a 3-port solenoid installed, will result in drastic under or over boost behavior. Always match your tune with the exact components and installation method required for that tune. This includes how the hoses are routed to/from the EBCS, and which boost restrictor pills are present. If you have any questions or concerns and will be using an OTS map, please contact us. If you'll be using a custom tune, talk to your Protuner about which EBCS and hose routing method they desire for your application.

Part List (712750)

  •   1 x COBB EBCS 
  •   1 x COBB Mounting Bracket 
  •   2 x M3 SS Socket Head Screw 
  •   2 x M6 SS Hex Bolt 
  •   4 x M6 SS Flat Washer 
  •   2 x M6 SS Lock Washer 
  •   2 x M6 SS Nuts 
  •   72” 4mm Silicone Vacuum Line 
  •   6 x 4” Zip/Cable Ties

Parts List (715750)

  •  1 x COBB EBCS 
  •   1 x COBB Mounting Bracket 
  •   2 x M3 SS Socket Head Screw 
  •   1 x M6 SS Hex Bolt 
  •   1 x M6 SS Flat Washer 
  •   36” 4mm Silicone Vacuum Line 
  •   6 x 4” Zip/Cable Ties


Tools Needed
  •   10mm Deep Socket 
  •   10mm Socket 
  •   12mm Socket 
  •   Flat Head Screwdriver 
  •   Ratchet 
  •   Needle Nose Pliers 
  •  Scissors

Important! Before beginning work, make sure the engine is cool to the touch!  You will be working very near/touching the turbocharger!


02-05 WRX and 04-05 STi (P/N 712750)


      1) Remove the cover on the passenger side of the engine bay where the factory boost control solenoid is located.

      2) Unplug the solenoid from the factory wiring harness.


      3) Remove the vacuum lines currently installed on the factory solenoid. 

      4) Using a 10mm deep socket, remove the two nuts securing the factory solenoid and remove the solenoid from the car.

      5) Install your new COBB EBCS onto the same studs that the factory solenoid used and tighten the 10mm nuts down hand tight.


      6) Follow the factory vacuum lines that were removed from the factory solenoid and remove them from where they terminate. One line will tee off into two lines and terminate on a WG nipple and a
          compressor housing nipple. The other will terminate into your turbo inlet hose. There is a plastic fitting about 4" from your turbo inlet hose where two hoses connect. Remove the hose that is between
          the boost solenoid and the plastic fitting.

      7) Using the supplied 4mm vacuum hose, press one end over the plastic turbo inlet fitting and route the hose back to the COBB solenoid. Cut the vacuum line to an appropriate length and press
           the end of the line onto PORT 1 on the COBB solenoid. 

      8) Using the supplied 4mm vacuum hose, press one end over the wastegate nipple and route the hose back to the COBB solenoid. Cut the vacuum line to an appropriate length and press the end
 
           of the line onto PORT 2 on the COBB solenoid.
  
      9) Using the supplied 4mm vacuum hose, press one end over the compressor housing nipple and route the hose back to the COBB solenoid. Cut the vacuum line to an appropriate length and
 
           press the end of the line onto PORT 3 on the COBB solenoid.
  
      10) Ensure all lines are neatly routed and tucked with no kinks in the line all while being fully seated onto the barbs of all the connections and secure them with the included 4" zip ties. Trim
 
             the ends of the ties with scissors.
  
      11) Go back and tighten the 10mm nuts that secure the COBB solenoid to the vehicle.
  
      12) Reinstall the lid that covers the solenoid housing.
  
      13) Enjoy the reduced response time and greater precision of your new COBB EBCS!
 
            
 
            Remember! You MUST properly tune for the installation of a 3-port EBCS. Using an off-the-shelf tune will result in overboosting.

      


 06-07 WRX and STi (P/N 712750)


      1) Using a 10mm socket, remove the nuts that secure the bracket on the passenger side of the engine bay that holds the boost control solenoid.



      2) Unplug all the factory vacuum lines and the factory electrical connect.


      3) Using a 10mm socket, remove the factory boost control solenoid and replace it in the same place with the COBB EBCS unit by using the factory nuts or the supplied hardware if needed.


      4) Follow the factory vacuum lines that were removed from the factory solenoid and remove them from where they terminate. One line will tee off into two lines and terminate on a WG nipple and a

          compressor housing nipple. The other line will terminate into your turbo inlet hose. There is a plastic fitting about 4" from your turbo inlet hose where two hoses connect. Remove the hose that is

          between the boost solenoid and the plastic fitting.


      5)  Using the supplied 4mm vacuum hose, press one end over the plastic turbo inlet fitting and route the hose back to the COBB solenoid. Cut the vacuum line to and appropriate length and press

           the end of the line onto PORT 1 on the COBB solenoid.


      6) Using the supplied 4mm vacuum hose, press one end over the wastegate nipple and route the hose back to the  COBB solenoid. Cut the vacuum line to and the appropriate length and press the

          end of the line onto PORT 2 on the COBB solenoid.


      7) Using the supplied 4mm vacuum hose, press one end over the compressor housing nipple and route the hose back to the COBB solenoid. Cut the vacuum line to an appropriate length and

          press the end of the line onto PORT 3 on the COBB solenoid.


      8) Ensure all the lines are neatly routed and tucked with no kinks in the line all while being fully seated onto the barbs of all the connection and secure them with the included 4" zip ties. Trim the

          ends of the ties with scissors.


       9) Go back and tighten the 10mm nuts that secure the COBB solenoid to the vehicle.


      10) Reinstall the lid that covers the solenoid housing.


      11) Enjoy the reduced response time and greater precision of your new COBB EBCS!


          Remember ! You MUST properly tune for the installation of a 3-port EBCS. Using an off-the-shelf tune will result in overboosting!



08+ WRX and 2005+ LGT (P/N 715750)

      1) Legacy GT owners need to remove the factory engine cover to gain access to the factory boost control solenoid.


      2) Using a 10mm wrench, remove the factory boost control solenoid found on the passenger side of the intake manifold. 


      3) Unplug the factory connector and remove the factory vacuum lines from the solenoid.


      4) Install the COBB EBCS and bracket into the same location using the factory bolt.



      5) Follow the factory vacuum lines that were removed from the factory solenoid and remove them from where they terminate. One line will tee off into two lines and terminate on a WG nipple and a

          compressor housing nipple. The other line will terminate into your turbo inlet hose. There is a plastic fitting about 4" from your turbo inlet hose where two hoses connect. Remove the hose that is

          between the boost solenoid and the plastic fitting.


      6) Using the supplied 4mm vacuum hose, press one end over the plastic turbo inlet fitting and route the hose back to the COBB solenoid. Cut the vacuum line to an appropriate length and press

           the end of the line onto PORT 1 on the COBB solenoid.


      7)  Using the supplied 4mm vacuum hose, press one end over the wastegate nipple and route the hose back to the COBB solenoid. Cut the vacuum line to an appropriate and press the end of

            the line onto PORT 2 on the COBB solenoid.


      8) Using the supplied 4mm vacuum hose, press one end over the compressor housing nipple and route the hose back to the COBB solenoid. Cut the vacuum line to an appropriate length and

          press the end of the line onto PORT 3 on the COBB solenoid.


      9) Ensure all lines are neatly routed and tucked with no kinks in the line all while being fully seated onto the barbs of all the connections and secure them with the included 4" zip ties. Trim the

          ends of the ties with scissors.


      10) Go back and tighten the 10mm bolt that secures the COBB solenoid to the vehicle.


      11) Reinstall the engine cover.


      12) Enjoy the response time and greater precision of your new COBB EBCS!

            

            Remember! You MUST properly tune for the installation of a 3-Port EBCS. Using an off-the-shelf tune will result in overboosting!



04-08 Forester XT (P/N 712750)


      1) Using a 10mm socket, remove the three screws that secure the bracket on the passenger side of the engine bay that holds the boost control solenoid.



      2) Unplug all the factory vacuum lines and the factory electrical connect.


      3) Using a 10mm socket, remove the factory boost control solenoid and replace it in the same place with the COBB EBCS and bracket by using the factory nuts or the supplied hardware if needed.


      4) Follow the factory vacuum lines that were removed from the factory solenoid and remove them from where they terminate. One line will tee off into two lines and terminate on a WG nipple

          and a compressor housing nipple. The other line will terminate into your turbo inlet hose. There is a plastic fitting about 4" from your turbo inlet hose where two hoses connect. Remove the hose that is between the boost solenoid and the plastic fitting.   


      5) Using the supplied 4mm vacuum hose, press one end over the plastic turbo inlet fitting and route the hose back to the COBB solenoid. Cut the vacuum line to an appropriate length and press

           the end of the line onto PORT 1 on the COBB solenoid.


      6) Using the supplied 4mm vacuum hose, press one end over the wastegate nipple and route the hose back to the COBB solenoid. Cut the vacuum line to an appropriate length and press the

          end of the line onto PORT 2 on the COBB solenoid.


      7) Using the supplied 4mm vacuum hose, press one end over the compressor housing nipple and route the hose back to the COBB solenoid. Cut the vacuum line to an appropriate length and

          press the end of the line onto PORT 3 on the COBB solenoid.

             

     8) Ensure all lines are neatly routed and tucked with no kinks in the line all while being fully seated onto the barbs of all the connections and secure them with the included 4" zip ties. Trim the

        ends of the ties with scissors.


     9) Go back and tighten the 10mm nuts that secure the COBB solenoid to the vehicle.


    10) Enjoy the reduced response and greater precision of your new COBB EBCS!


          Remember! You MUST properly tune for the installation of a 3-port EBCS. Using an off-the-shelf tune will result in overboosting!


08+ STi (P/N 715750)


      1) Using a 10mm and 12mm socket, remove the nuts that secure the bracket on the passenger side of the intake manifold that holds the boost control solenoid under it.



      2) Unplug all the factory vacuum lines and the factory electrical connector.


      3) Install the COBB EBCS and bracket onto the factory bracket as shown below.




      4) Follow the factory vacuum lines that were removed from the factory solenoid and remove them from where they terminate. One line will tee off into two lines and terminate on a WG nipple and a

          compressor housing nipple. The other line will terminate into your turbo inlet hose. There is a plastic fitting about 4" from your turbo inlet hose that joins two hoses end to end. Remove the hose

          that is between the boost solenoid and this plastic fitting.


      5) Using the supplied 4mm vacuum hose, press one end over the plastic turbo inlet fitting and route the hose back to the COBB solenoid. Cut the vacuum line to an appropriate length and press

          the end of the line onto PORT1 on the COBB solenoid.


      6) Using the supplied 4mm vacuum hose, press one end over the wastegate nipple and route the hose back to the COBB solenoid. Cut the vacuum line to an appropriate length and press the

          end of the line onto PORT 2 on the COBB solenoid.


      7) Using the supplied 4mm vacuum hose, press one end over the compressor housing nipple and route the hose back to the COBB solenoid. Cut the vacuum line to an appropriate length and

          press the end of the line onto PORT 3 on the COBB solenoid.


      8) Ensure all lines are neatly routed and tucked with no kinks in the line all while being fully seated onto the barbs of all the connections and secure them with the included 4" zip ties. Trim the

          ends of the ties with scissors.


      9) Reinstall the factory bracket that holds the EBCS in place onto the intake manifold.


      10) Enjoy the reduced response and greater precision of your new COBB EBCS!


          Remember! You MUST properly tune for the installation of a 3-port EBCS. Using an off-the-shelf tune will result in overboosting!



External Wastegate Installation

      1) Hook up vacuum lines as outlined below.


            a. Port 1 is T-ed to the bottom port on the external wastegate (not on the top) and the compressor housing (boost pressure source).


            b. Port 2 is routed to the top port on the external wastegate.


            c. Port 3 is routed to the intake.



Links

COBB Product Install Instructions for Subaru Vehicles 

Main Installation Instruction Repository for Subaru Parts



Calibration Map Notes for Subaru Vehicles

Link to Subaru Map Notes to see what map you should be on given the parts you've added


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Email: support@cobbtuning.com

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866.922.3059


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