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how much back pressure ?

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  • how much back pressure ?

    My system has a bastuk decat pipe then a straight through to the rear silence box thats all,now im getting a different system made up thursday to try and gain more power and torque as i feel having no bk pressure is the reason my car lags and takes longer to boost progressivly,so any one know how much back pressure will be needed please.

    -ko3 hybrid turbo
    -i/c+ pipes
    -fueling kit + reg
    -480cc inject
    -high comp pistons+ rods
    -dv+ rcv
    -flowmaster missing the cold air pipe work could be another factor

  • #2
    Let us no how much you will want for the bastuck decat once its off
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    Astra Vxr GENUINE AFLs for sale...
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    • #3
      No backpressure at all is the best for power

      Some reading - http://www.nsxprime.com/FAQ/Miscella...austtheory.htm
      Last edited by IanJ; 15 June 2011, 12:47 AM.

      Astra

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      • #4
        As above ^^

        Beat exhaust for a turbo is no exhaust

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        • #5
          Hmmm beleive the ko3 Hybrid needs slight bck pressure will let u all know

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          • #6
            Originally posted by chrisw_vxr View Post
            Hmmm beleive the ko3 Hybrid needs slight bck pressure will let u all know
            Turbos don't need backpressure - on the Astra it's the reason why the oil restrictor is used as the lack of back pressure exposes the oil seals to greater pressure, nothing to do with power or lack of it though.

            Astra

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            • #7
              Originally posted by IanJ View Post
              No backpressure at all is the best for power

              Some reading - http://www.nsxprime.com/FAQ/Miscella...austtheory.htm
              good find ian!!! interesting readin there
              Daily Mk7 Golf R - Nortech Corsa Track Car !

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              • #8
                ditch the dv

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                • #9
                  Originally posted by CH07 ALL View Post
                  ditch the dv
                  Good shout! N back pressure sorted out i wer running a 2" pipe from decat made a good tone and noise but **** for the power fig so stand by for pics in a few weeks

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                  • #10
                    you'll feel the boost pick up better in changes with out the dv, i noticed straight away.

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                    • #11
                      Will you be selling any of the old zaust parts ?

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                      • #12
                        Running one silencer as you are at the moment is probably spot on.
                        Previously arctic311 Corsa Stage 3 Regal TV mag featured-Stage 2 Astra vxr

                        Detailing and Paint correction covering West Midlands
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                        • #13
                          Ok i will be selling my centre section from decat back to the rear section ,it will be consisting of 2" stainless steel grade 303 pipe and a silence rear section with the standard corsa vxr triangle tip for the oe look but a aggressive nice sound,im looking for 120 for the lot.cheers
                          Last edited by chrisw_vxr; 15 June 2011, 11:23 PM.

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                          • #14
                            with straight through exhaust... and 3" size... the turbo needs more time to load... but when it kicks in your going to have more hp on high rpm

                            with silenced exhaust... 2.5"size.. the turbo needs less time to load.. you have more hp in the medium range of rpm.. and more nm ... but less hp on high rpm

                            another problem is the intercooler... if your intercooler is to big you have more turbo lag
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