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72 Torino GTS single rear mount Now a 7265 T4

Discussion in 'The Turbo "Builds" Board' started by 72gts, Aug 29, 2021.

  1. 72gts

    Joined:
    Aug 16, 2021
    Well I finally got under the car this weekend.

    I pulled the dual exhaust and started to hack weld...Uhhh...I mean tack weld some 2-1/2" exhaust pieces together.

    As I've confessed in the "introduce yourself" section, I'm not a good welder, but I am an accomplished grinder. Luckily my dad owns a TIG welder and is pretty "ok" at it.

    I bought a gt3582 directly from maxspeedingrods as it was cheaper than ebay, and will be doing a rear mount.

    I mocked up a y-pipe from the headers and to the drivers side using all new pipe. I also tacked together the dump pipe. The exhaust dump pipe routing will be interesting to say the least. I'll post pics of that too once I get it finalized, hopefully by the weekend.

    The next time I get to work on it (probably mid week) I'll continue with the mid pipe, a "S" section, and into the turbo just ahead of the axle.

    I have a scavenge pump ready to go and a 120" of ptfe -3AN to feed the oil to the turbo.

    But first some pics of the soon to be sold Paxton

    20210828_105745.jpg #ad


    20210828_105701.jpg #ad
     
    Last edited: Nov 11, 2021
  2. 72gts

    Joined:
    Aug 16, 2021
    A couple pics of the Y-pipe

    20210829_175313.jpg #ad


    20210829_175236.jpg #ad
     
    Last edited: Nov 11, 2021
    tbird and B E N like this.
  3. 72gts

    Joined:
    Aug 16, 2021
    I welded most of the sections of the y-pipe a couple days ago, and snuck an hour in after work tonight test fitting and grinding off the extra splatter.

    Yes....sadly....I officially suck at welding, but continue to improve my grinding skills.

    The y-pipe still fits up quite well because I alternated where I welded so as to not warp anything too much.

    I plan to solidly mount the turbo to the car with a 1/4" bracket.

    I've got a Vibrant stainless steel 2 1/2 inch flexible coupler on the way which should allow the exhaust to flex slightly.
     
  4. 72gts

    Joined:
    Aug 16, 2021
    20210902_174450.jpg

    20210902_174424.jpg
     
    Last edited: Sep 4, 2021
  5. 72gts

    Joined:
    Aug 16, 2021
    The weld at the "y" junction is not mine.....it came that way. Haha.
     
  6. Disney Lincoln

    Joined:
    Feb 14, 2003
    You're good at grinding!
     
  7. B E N

    Joined:
    Nov 22, 2016
    Are you using a flux core wire? If so spatter is hard to avoid, super clean welds are tough and your more likely to burn through thin stuff. Keep at it, looks fine!
     
  8. 72gts

    Joined:
    Aug 16, 2021
    Thanks B E N

    I will check. My dad will know, but he's been under the weather which is why I had at it with the MIG.
    I really need to learn how to TIG but that'll have to wait.
    That y-pipe is a lot thinner than the other pipe sections and I did blow through a couple times.
    I also learned that gravity is my friend.
    Once I positioned the pipe so I was working downward, the seams were easier to fill.
    I will pressure test it too, then paint it.
    When the whole exhaust is done I will wrap it and no one will see it. Ha ha ha.
     
  9. B E N

    Joined:
    Nov 22, 2016
    Welding tubing uphill with a mig can be a real pain, good call on changing the position!
     
  10. Mnlx

    Joined:
    Sep 20, 2009
    Not to be that guy, but am I the only one thinking that a single GT3582 (guessing most likely a T3) is much too small for this build? A GT45, or S366 would be the smallest i'd be looking at.
     
    Disney Lincoln likes this.
  11. 72gts

    Joined:
    Aug 16, 2021
    Oops

    I really do appreciate the input. That's one reason I joined the forum.

    I probably should have asked for input from you guys, but I already bought it.

    It is a t3. I'll post up the specs in a bit.

    Hopefully it'll get me at least 350 rwhp, a little more than what the Paxton yielded.

    If it's any less than 325ish I'll save up for something better....possibly bb & billet.

    I expected my first turbo purchase to be "off" somewhere
     
    Last edited: Sep 12, 2021
  12. 72gts

    Joined:
    Aug 16, 2021
  13. 72gts

    Joined:
    Aug 16, 2021
    I sort-a based my choice on price, and what I could find for a compressor map for the Garrett.

    I realize the maxspeedingrods is not a Garrett by a long strech, but most of the specs line up pretty well.

    So I took a stab at it, and I'm hoping for 400-ish rwhp at 10 lbs of boost. If it's 350, then well - - - ok, so be it.



    upload_2021-9-3_13-23-26.png #ad
     
    Last edited: Sep 3, 2021
  14. 72gts

    Joined:
    Aug 16, 2021
    ..... but hey.... at least I'm not giving up an estimated 50 - 60 hp to spin the Paxton.

    And I'm guessing the engine will accelerate quicker without the Paxton robbing power.

    (nothing against centri's though. I loved the SN while it was on there. What a learning experience !! )
     
    Last edited: Sep 3, 2021
  15. Mnlx

    Joined:
    Sep 20, 2009
    I don't necessarily think the compressor is undersized, but the small turbine is going to limit hp, and rpm.
     
  16. 72gts

    Joined:
    Aug 16, 2021
    so maybe a T4 flange and something like these specs?

    Turbine Trim: 77.6
    Turbine Inducer Diameter: 88 mm
    Turbine Exducer Diameter: 77.5 mm
    Turbine A/R: 1.05
     
  17. Mnlx

    Joined:
    Sep 20, 2009
    That's a GT45 which could work pretty decent. I actually like the S366 which has a 80/73 turbine. All this hinges on what power it makes na. The GT35 compressor is a decent fit up to about 250 hp na, but I still feel the turbine will hold you back even at that hp level. If you're above 250 hp na, then the 366 or GT45 are better. You want a T4 flange.
     
  18. 72gts

    Joined:
    Aug 16, 2021
    Excellent. Thank you.

    It was about 250 - 260 rwhp na
    325 - 330 rwhp at 7 - 8 psi (7 psi was about 375 hp, then take off ~50 for the Paxton, so around 325 net rwhp)

    When I get this sorted, I will definitely search out a T4.
     
  19. Mnlx

    Joined:
    Sep 20, 2009
    250 whp na needs a bigger turbo. The gt45 is super cheap, and probably worth a try
     
  20. Russell

    Joined:
    Jan 13, 2019
    I have always heard that the GT45 is physically large. Where are you rear mounting it? How much room is there?
     
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