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Thread: S52 Cutring Headgasket and Arp headstud.

  1. #1
    Join Date
    Jun 2018
    Location
    Albuquerque, NM
    Posts
    6
    My Cars
    1998 BMW M3 Coupe

    S52 Cutring Headgasket and Arp headstud.

    What am i limited in terms of power for a cutring headgasket and arp headstud upgrade to a 220 k miles car, i want to turbo soon and the turbo is a gt35 rated for 500, can i run that and be safe for the engine and not pushing the turbo, or should i upgrade to a gt30 (600+) and be safe with that and do all supporting mods for 600. i know its a lot of "depending on the tune" but i just want to know what i am limited to in terms of power and boost.

  2. #2
    Join Date
    Apr 2006
    Location
    Minnesota eh?
    Posts
    6,155
    My Cars
    86 325es
    What fuel do you intend to run? If pump gas you will also need to add the copper spacer as well to lower the compression a bit. If everything is right about 550 whp is the max that will be safe before you’ll be at risk of pretzeling up the rods. A gt35 is good for about 650 whp. A gt30 is smaller than a 35.


    86 325es, 2.8L m50, S476sxe, ProEFI 128 ecu, e85, solid rear axle, TH400 trans, 28x10.5w slicks, zip ties, popsicle sticks, tape
    best time 9.06 @ 151.8 mph, best 60 foot 1.30

  3. #3
    Join Date
    Jun 2018
    Location
    Albuquerque, NM
    Posts
    6
    My Cars
    1998 BMW M3 Coupe
    Quote Originally Posted by someguy2800 View Post
    What fuel do you intend to run? If pump gas you will also need to add the copper spacer as well to lower the compression a bit. If everything is right about 550 whp is the max that will be safe before you’ll be at risk of pretzeling up the rods. A gt35 is good for about 650 whp. A gt30 is smaller than a 35.
    yes i will be running pump gas, and honestly im okay with 550 cause thats pretty good for basically stock until i can upgrade parts and make more. gt30 is smaller but says it can make more for some odd reason i dunno ill try and post a build progress if interested but im sure im not the only one doing this type of build.

  4. #4
    Join Date
    Apr 2006
    Location
    Minnesota eh?
    Posts
    6,155
    My Cars
    86 325es
    Whoever said a gt30 will make more power than a 35 is not a reliable source of info lol. A 35 or similar size precision or BW is the minimum that should be considered for what your trying to do. Look into the Garrett gtw turbos like the gtw3884


    86 325es, 2.8L m50, S476sxe, ProEFI 128 ecu, e85, solid rear axle, TH400 trans, 28x10.5w slicks, zip ties, popsicle sticks, tape
    best time 9.06 @ 151.8 mph, best 60 foot 1.30

  5. #5
    Join Date
    Jun 2005
    Location
    New England
    Posts
    25,402
    My Cars
    F90 M5; E36 M3 Turbo
    On a 220k mile S52, I’d stay conservative unless you don’t mind blowing it up and building a motor. Definitely drop CR with the spacer. Are you running 91 or 93 pump gas? Will you be using water/meth? If it was me, I’d aim for more like 500 lbs and 500 rwhp if I wanted to reduce the risk of having to take it all apart and swap in another S52 or build a motor.

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