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what size turbo

Discussion in 'Forced Induction' started by breed, Apr 25, 2004.

  1. breed

    breed Senior Member

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    I have a turbo ls/vtec but I got the turbonetics turbo from someone and they don't know what size turbo it is. I think it's a t4 but I'm not sure. the turbo is not completly spooled till about 4000 rpm's. I want to be spooled up at like 2500-3000 rpm's. what size turbo should I get that can give me good power but still spool fast?
     
  2. turboB20hatch

    turboB20hatch Senior Member

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    change the trim on ur turbo save urself $
     
  3. pissedoffsol

    pissedoffsol RETIRED

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    i doubt its a t4.
    maybe a t3/t4

    if you want to spool faster, up the compression of your motor, give your motor more air flow, head work, etc and get a real 3" exahust. the exhaust is holding your spool back a LOT im sure.
     
  4. breed

    breed Senior Member

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    how do I change the trim?
     
  5. breed

    breed Senior Member

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    also whats a good 3" exhaust or should I get it custom
     
  6. NotUrAverage_Si

    NotUrAverage_Si Senior Member

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    get a smaller compressor wheel and housing.
     
  7. NotUrAverage_Si

    NotUrAverage_Si Senior Member

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    your local muffler shop can make you 3" exhaust/downpipe.
    if you don't have a downpipe already, turbonetics makes a downpipe flange with a 3" adapter outlet for a 3" downpipe for about $20.
     
  8. breed

    breed Senior Member

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    if I get it from a local shop it will be crush bent does that make a big difference?
     
  9. NotUrAverage_Si

    NotUrAverage_Si Senior Member

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    the shop can't make it mandrel bent? I would only use mandrel bends, if that shop doesn't do it then find a shop that will. Mandrel bends are more expensive but I think it's worth it. I mean don't get me wrong crush bent will work also but with mandrel you don't get the narrowing of the pipe where the bends are. my custom downpipe right now is crush bent but I wish I would have gotten it mandrel bent which is what I'm gonna do eventually.
     
  10. pissedoffsol

    pissedoffsol RETIRED

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    crush bent 3" is probably worse than mendrel bent 2 1/2.

    but seriously, leave the turbo alone for now. i think there are other areas that are bottle necking you.

    1- downpipe. if its not 3", toss it.
    2- cat, if you have one at all, its hurting you- but if you need to run one, get a 3" high flow as well
    3- cat back, 3" mendrel
    4- muffler - striaght through as possible. none of this twin-loop quad tip bullshit.

    doing that will give you at LEAST a 500 rpm jump in spool
     
  11. b16ahatch

    b16ahatch Senior Member

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    :werd: :withstupid: I had an apexi n1 cat back on my car with a crap fmax douwn pipe. When i put my thermal 3 inch and a 3inch down pipe i went from 285whp to 348whp. If i were you first thing on my shopping list be a full 3 inch exhaust.
     
  12. jeffsciv23

    jeffsciv23 Senior Member

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    damn thats a big jump by just changeing the exhaust. i knew it hurt you but i didn't know it was like that.
     
  13. brasilianstreet

    brasilianstreet Senior Member

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    ey where did you find the apexi n-1 catback 3' ,i have a regular apexi n-1 catback but im going turbo so now i need a 3' one and i want the apexi i know they make one but i never could find one?
     
  14. radnulb

    radnulb Senior Member

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    I have a custom mandel bent 3" exhaust and 3" DP on my CRX with a 3" in 4" out Apexi N1 coffeecan on my turbo LS. Works fairly well. The N1 is pretty much a straight through kinda deal... not much in the way of restrictions.
     
  15. pissedoffsol

    pissedoffsol RETIRED

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