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  1. #1
    Join Date
    Oct 2004
    Location
    Austin,Tx,
    Posts
    154

    Buick Grand National Twin Scroll EFR Turbo build

    Hey guys, I haven't posted on here in a very long time but I wanted to share a project I'm just now finishing. I don't know how many of you guys are familiar with the Borg Warner EFR turbos but in my opinion they are simply the best turbochargers available on the market. I'll let you guys look them up but they are the quickest spooling turbos due to several neat features but the main one being the gamma titanium turbine wheel and shaft. After having a timing chain failure in my buick and having to build the motor, I decided that I had to have this turbo along with the advantages of doing a twin scroll setup. Unfortunately, nothing off the shelf was available so I had to build several custom parts to get it to work. The final result is still to be seen as I have not finished tuning the car or broken in the motor but I will say that the spool up is phenomenal and the car feels as fast now at 10 psi than it was before at 20. Any ways Here are the pictures of the build.

    The Turbo when it arrived
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    The mocking up of brackets
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    The finished products
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    Turbo Comparison to TE-44
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    Exhuast Moddifications
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    Going on the motor
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    In the Car
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    Attached Images Attached Images      
    1969 RS Camaro
    1985 Buick GN
    2005 F-250


  2. #2
    Join Date
    Jul 2011
    Location
    Prescott, AZ
    Posts
    205
    Country Flag: United States
    Superb fabrication and install! We agree that the EFR's are the best turbos on the market right now. There's a reason all the turbo indy cars and most Le Mans cars use them lately. Is yours a 7670?
    Last edited by Centerforce; 10-25-2016 at 03:26 PM.

  3. #3
    Join Date
    Oct 2004
    Location
    Austin,Tx,
    Posts
    154
    Thanks for the compliments. Yeah, Indy car has run them for 2 seasons now with 0 failures! Mine is the 8374 that is being run to its max potential. It's incredible how fast it spools on this little v6, it almost acts like a big block motor.
    1969 RS Camaro
    1985 Buick GN
    2005 F-250

  4. #4
    Join Date
    Mar 2006
    Location
    Lowell, MI
    Posts
    395
    Country Flag: United States
    Badass dude! Awesome twin scroll flange you made.

    Turbo Charged LS1/T56

  5. #5
    Join Date
    Nov 2006
    Location
    Hildebran, NC
    Posts
    961
    Country Flag: United States
    Quote Originally Posted by Paul69camaro View Post
    Thanks for the compliments. Yeah, Indy car has run them for 2 seasons now with 0 failures! Mine is the 8374 that is being run to its max potential. It's incredible how fast it spools on this little v6, it almost acts like a big block motor.
    This thing looks awesome!
    Where are the burnout vids????

  6. #6
    Join Date
    Oct 2004
    Location
    Austin,Tx,
    Posts
    154
    how do I post a video off an iPhone?
    1969 RS Camaro
    1985 Buick GN
    2005 F-250

  7. #7
    Join Date
    Jul 2011
    Location
    Prescott, AZ
    Posts
    205
    Country Flag: United States
    Quote Originally Posted by Paul69camaro View Post
    how do I post a video off an iPhone?
    The easiest way would be upload to youtube, then post the URL here.

  8. #8
    Join Date
    Feb 2013
    Posts
    1,211
    Country Flag: United States
    Subbed for burnout video...


    Ridetech Suspsension
    Tech Specialist
    Phone: 812.481.4734

    Project Fox
    1979 Trans Am

  9. #9
    Join Date
    Nov 2012
    Location
    springville al
    Posts
    18
    Country Flag: United States
    That looks so clean cant wait for vido

  10. #10
    Join Date
    Dec 2010
    Posts
    709
    That is some very nice work there, and it's a whole bunch of turbo! I don't usually care about dyno numbers, but for this, I'm really intrigued. Does this type of turbo stress the engine a bit less at lower RPMs, even with the quicker spool, or does it require a bit more attention to the buildup of the block than a typical single turbo setup that will be a bit laggy, then hit you in the junk?

  11. #11
    Join Date
    Jun 2016
    Location
    Eastampton, NJ
    Posts
    35
    Paul,

    Any update on this project and how it worked out? I'm currently running a TE44 in my GN and was just researching these BW turbos.

    Looks like a great build!

    Dave