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  1. #1
    Dex
    Dex is offline
    kut!
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    Cast Iron exhaust manifold VS stainless?



    VS:




    sooo, cast iron seems cheap. no cracking (?), but looks restrictive? or am i totally wrong? Someone got expierence with both? Or a very good idea?

    Teach me! (i seem to be in a learning-frenzy-stage atm, sorry)
    Priority warning. Outland stabilization force six Nova Prospekt. Perimeter restrictors disengaged.

  2. #2
    Jeff Mills Is Watching!
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    Glad you asked this Dex as I saw that cast mani on eBay and assumed it was wank too.

    Looking forward to the answer
    Its WALTON!!!

  3. #3
    dorifto kingu!
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    what power you wanting from it?

    stock will see 350... have heard or people porting them and seeing near the 400...

  4. From the Driftworks Shop
  5. #4
    spl dori master
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    Stainless looks pretty and is lighter.

    Cast doesn't tend to crack (depending on it's age and nickel content) and retains more heat in the exhaust gases.

    For absolute all out maximum power, an equal length tubular manifold will be better (which is why the fastest 4wd drag cars have them, though they are designed very specifically to suit the engine and cams they are using). An off the shelf solution will probably show little to no improvement.

    A cast manifold should bring the turbo on a few hundred rpm sooner, as they keep more heat (energy) in the exhaust gas.

    But a stainless 'bunch o bananas' looks pretty.

  6. #5
    dorifto kingu!
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    cast mani for the win
    Limiter Bash gets the Gash
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  7. #6
    Made guy

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    im all for cast manifolds. they dont break!

    as for ebay, often the quality problems from cheap manifolds, be them ali or cast is the maching. i.e the surfaces that are supposed to be flat, often arnt at all!
    GARAGE SOUTHERN STYLE

  8. #7
    tail slider
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    Seems for reliability cast, bling stainless. Think porting original could be the way forward.
    tyres realllllllly hate me

  9. #8
    Miseryguts

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    Stock is fine unless you fitting a T3 flanged turbo

  10. #9
    Back to Black
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    For bottom mount, I go tubular. Flatten the faces on a belt sander, fuck off the studs for bolts & locking nuts where possible then the turbo gasket lasts too.

    My last XS power cheapo lasted about 3 years of constant abuse -not bad for the 100 it cost.

  11. #10
    dorifto kingu!
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    i think greg gush said when he mapped my car and i got more tourque than if i had tubular! :S
    BDC SUPER PRO NO 10
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  12. #11
    DORITECH MOTORSPORT

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    Quote Originally Posted by Stavros View Post
    Stock is fine unless you fitting a T3 flanged turbo
    Unless your Bonbon then he will just weld a new flange on and while he is at it weld a wastegate flange to the otherside HKS/Tomei has nothing on BonMods.


    >>>>>>>>>>> www.doritech.com <<<<<<<<<<<

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  13. #12
    Back to Black
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    I'd take a 10 lbs of torque drop to save half an hour getting the bastard off

  14. #13
    kam
    kam is offline
    I've touched Chris Parry

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    Skim it.
    Brace it.

    Sorted.


    SKYLINE GEOMASTER KNUCKLES - NOW AVAILABLE!

    Quote Originally Posted by Hamis-509 View Post
    I sent an anvile, my bowling ball collection and 60" tv I had packaged in lead for 39.99...

  15. #14
    dorifto kingu!
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    Iam running a stock rb25det manifold that has been ported and modded for external wastegate.

    Works fine, I have used it for 4 events since fitting it. The previous owner used it for about 3 years or so iirc, its been to nurnurgring a couple times and was fitted to an rb20 with 403hp.

    Ill try slap pics up later

  16. #15
    Jeff Mills Is Watching!
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    Quote Originally Posted by Stavros View Post
    Stock is fine unless you fitting a T3 flanged turbo
    Exactly this was what I was thinking, hence why I looked on eBay at the mani Dex posted first. They do a t3 version. Was thinking it'd be a lot less likely to crack than a tubular and doing a budget Holset build was kind of the original idea but if the XSPower one can be braced to take it then maybe that's worth the money.

    Won't be for a long while yet for me but this is still good info.
    Its WALTON!!!

  17. #16
    dorifto kingu!
    Join Date
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    I just bought the japspeed bottom mount tubular jobbie to replace my standard mani lol

    Gavwan stated to flatten faces and use bolts and locking nuts where possible, is there anything else that should be done before putting it on?

    Sorry for minor hijack

    Rob

  18. #17
    kam
    kam is offline
    I've touched Chris Parry

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    BRACE IT!!!



    Look at any turbocharged race engine, do what they do.


    SKYLINE GEOMASTER KNUCKLES - NOW AVAILABLE!

    Quote Originally Posted by Hamis-509 View Post
    I sent an anvile, my bowling ball collection and 60" tv I had packaged in lead for 39.99...

  19. #18
    Miseryguts

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    Always cracked me up, that even 7yrs ago or so when I first bought a Jap car, all you would read is people crying about manifolds cracking, and its the same still today.
    I used to say to people then brace them, as thats what everyone does, even some standard cars, but nobody ever takes any notice.





  20. #19
    Back to Black
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    Quote Originally Posted by Sticklin View Post
    I just bought the japspeed bottom mount tubular jobbie to replace my standard mani lol

    Gavwan stated to flatten faces and use bolts and locking nuts where possible, is there anything else that should be done before putting it on?

    Sorry for minor hijack

    Rob
    Check there is room for M8 nuts on the top of the flange next to the pipes before drilling out the threads for the studs. I have 2 bolts going upwards and 2 down. It takes longer doing the first time getting the right length bolts but I swear by it.

    I'm hopefully going topmount next so will definately brace the turbo as much as possible. I've learnt the hard way that a bit of extra prep doing these jobs pays you back in less 's later.

  21. #20
    Made guy

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    Quote Originally Posted by Gavwan View Post
    I'd take a 10 lbs of torque drop to save half an hour getting the bastard off

    absolute yes!
    GARAGE SOUTHERN STYLE

 
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