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exhaust: 2.36" vs. 2.5"

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    #1

    exhaust: 2.36" vs. 2.5"

    On a mild H22 n/a build (valvetrain, cams) which would be better?

    I already have a Rsr 60 mm (2.36") ID exhaust, and I love it. I was just wondering if I will be robbing myself of some extra horses or tq by not being a true 2.5" ID exhaust. Input?
    Last edited by Smiley_cb7; 06-30-2012, 12:38 PM.
    Tags: None
    #2
    Your current exhaust is fine for anything up to about 5k rpms. If you want to maximize your power above 5k you'll get it with a larger exhaust with the expense of a loss of power below ~3k. In general though, the H22 does well with a 2.5"-3" exhaust, especially when you add cams and valvetrain upgrades.

    Along with this just make sure you have a quality header and true 3" intake piping to maximize the gains from the cams.

    And a TUNE, you'll gain alot from a good tune!
    My Member's Ride Thread

    Bisimoto header before & after dyno

    1993 10th Anniversary: F22a6, H23IM, Bisimoto header, Custom mandrel exhaust, 5spd swap.

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      #3
      Yea the header I have has a 2.5" collector, and even though its not that much of a difference between 2.36 and 2.5, I want it as free flowing as possible. So you think maybe 3"?

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        #4
        If your header is 2.5" don't go smaller than that. For a stock h22 2.5" would be fine but since you will have cams and hopefully a tune which will move your powerband up the rpm range you'll want your exhaust velocity to be optimum at this higher rpm range and thus you will be better off with the 3".
        My Member's Ride Thread

        Bisimoto header before & after dyno

        1993 10th Anniversary: F22a6, H23IM, Bisimoto header, Custom mandrel exhaust, 5spd swap.

        Comment

          #5
          In never have had cams in my car at allbut for stock 2.25 did well for me whuped ass left and right. For cams I dont really no but I know but only one way to find out.

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            #6
            3" is the way to go, makes power on an otherwise stock engine


            Originally posted by lordoja
            im with you on that one bro! aint nothing beat free food and drinks any day of the week, even if its at a funeral

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