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exhaust?

Discussion in 'Forced Induction' started by B16aJWHO, Nov 17, 2003.

  1. B16aJWHO

    B16aJWHO Junior Member

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    I am putting a t3 turbo on my b16a with stock internals and i am planning on running 7-10 psi. what size piping should i use on my custom exhaust?
     
  2. swanny

    swanny Senior Member

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    3 inch or if ya wanna be stealth keep the stock exhaust and put a cut out on it :D
     
  3. LSTurboCivic4DR

    LSTurboCivic4DR Junior Member

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    I would run a 2.5", that should be good enough for the T3. I dont see a need for a 3" and there hard to fit also. If you want the 3", Thermal sells a good 3" system prefabbed for you car, and if you upgrade later, it would save some money insted of buying 2 exhausts. Look at what your overall goal for the car are. If you plan on running more boost later or a bigger turbo, spen more on the 3" now, if you are going to run light boost with that turbo for good, go 2.5", its plenty of flow.
     
  4. pissedoffsol

    pissedoffsol RETIRED

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  5. InsaneCivicSedan

    InsaneCivicSedan Junior Member

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    3" mandrel = quickest spool
     
  6. preluderjs

    preluderjs Senior Member

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    Is that right? Cuz the idiot i bought my car from has piping that i believe is 3" and the throttle response sux and takes longer to spool than I think it should.... but then I do have a tiny turbo too. Is a T3 that much larger than a K03?... anyone have any idea at all?
     
  7. pissedoffsol

    pissedoffsol RETIRED

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    the exhuast can only be as effective as the downpipe coming off the turbo. most kits use a 2.5 DP. turbos hate backpressure, and thats why the larger exhaust gives more power.

    there's a lot more to spooling a turbo than exahust size...

    proper manifold design that keeps backward flow out of the head
    gas flow to spool it in the first place
    post detonation
    eld's
    overall size
    motors displacement/cfm of air flow pushing out
    VE
    and so much more
     
  8. preluderjs

    preluderjs Senior Member

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    Would the slightly smaller exhaust help at all though? My turbo is incredibly small... and my "effective" downpipe has a hole in it for now and when I noticed the throttle response. + everything else is stock on the car.
     
  9. pissedoffsol

    pissedoffsol RETIRED

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    smaller does NOT help at all in any way. some peeps are stepping to 3.5" downpipes and 4" exhausts on their high power-ed cars lately
     
  10. SolReaver

    SolReaver Senior Member

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    um, no. Think about it. If there is backpressure (restriction) in the exhaust, thats restricting the turbo from spooling up. Remove that restriction and see the turbo spool faster, thus making more power faster

    note how when peeps run open downpipe they gain 95 whp as compared to with an exhaust
     
  11. preluderjs

    preluderjs Senior Member

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    Ok, that all makes a lot more sense and it should actually help my spool time... but I'm still not sure about throttle response: I mean specifically how long it takes the engine to respond to input. If I'm just a dumbass and it has nothing to do with exhaust size just say so.
     
  12. TommyTheCat

    TommyTheCat Gonzo Scientist

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    A lot of people are saying 2.5" is fine up to something like 300-350hp*. Then you start switching and moving up towards 4"(Which is ungodly large, 1000+ supra need apply only).

    Going with a a 2.5" versus a 4" for a t3, I hardly think you'll see an increase in low rpm boost.

    *This is reflective of turbo choices for the power range. I.E. not a T78 or GT40.
     
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