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  • Vems How to improve boost quicker.

    I ran E85 Rs2Turbo N75 Max Boost 300Kpa used Virtual Dyno Compare to 034
    It's come late

    DY5 is E85 Logfile with Any Trim Flex Fuel Sensor

    Boost DC 90%
    Attached Files

  • #2
    have you changed the exoust piping and have the cat removed??

    Comment


    • #3
      always ive changed to bigger piping 3" or bigger, the boost comes earlier....600-1000rpm

      Comment


      • #4
        I changed exhaust pipe too twin 2 1/2" and no cat but my downpipe didn't change.

        Comment


        • #5
          you might want to contact 034 and ask them what a/r hotside the dyno graph was done with, and if that matches what you have on your turbo.
          Marc Swanson
          Proprietor, EFI Express
          95.5 //S6 Avant
          90' Coupe Quattro V8 4.2L twin turbo
          93' //S4
          83' UrQ
          97' F250 7.3 diesel

          Comment


          • #6
            Originally posted by KRIENG View Post
            I ran E85 Rs2Turbo N75 Max Boost 300Kpa used Virtual Dyno Compare to 034
            It's come late

            DY5 is E85 Logfile with Any Trim Flex Fuel Sensor

            Boost DC 90%
            I have sat on a shelf a 034 rs2 chip-set, I found it very disappointing there would be far better chip sets to compare your VEMS too
            RS 2 580HP

            Comment


            • #7
              Also check if they used the same gear as you. If they did the dyno in 5th and you did the run in 3rd it is possible to see later boost.
              Go Holset or Go RS4

              Comment


              • #8
                My GT2871 also does the something.i'm running with vems.i got 0.8 bar at 3000rpm and full
                Boost after 3200-3300RPM but my valve guided is worn and caused the boost
                Leaky through out the PCV system.that might be a culprit.i have wagner 'em and full
                3" pipe on DP.
                one of a few I5 from Asia.

                Comment


                • #9
                  Originally posted by popdemonic View Post
                  My GT2871 also does the something.i'm running with vems.i got 0.8 bar at 3000rpm and full
                  Boost after 3200-3300RPM but my valve guided is worn and caused the boost
                  Leaky through out the PCV system.that might be a culprit.i have wagner 'em and full
                  3" pipe on DP.
                  What is your full boost?


                  DNA Autocare Ltd
                  Danny
                  www.dnaautocare.co.uk

                  Comment


                  • #10
                    Originally posted by Billman View Post
                    Also check if they used the same gear as you. If they did the dyno in 5th and you did the run in 3rd it is possible to see later boost.
                    Like++

                    Comment


                    • #11
                      Yeah they could of just loaded it up on the dyno in a higher gear.

                      Comment


                      • #12
                        Originally posted by DNA-S2 View Post
                        What is your full boost?


                        DNA Autocare Ltd
                        1,8bar and taperred off after 5000rpm.

                        the turbo is GT2871 a/r .63 the graph said

                        it should be full boost by 2000RPM.i tried to

                        set the wastegate fully closed on the begining

                        it's still full boost at 3200RPM. i have mostly done

                        every upgraded parts on my car besides, the huge

                        boost leak on valve guides.
                        one of a few I5 from Asia.

                        Comment


                        • #13
                          Originally posted by popdemonic View Post
                          boost leak on valve guides.
                          that actually means boost leak on the valve/valve seat. the guide shouldn't see any pressure from the combustion chamber with the cylinder @ TDC.
                          Marc Swanson
                          Proprietor, EFI Express
                          95.5 //S6 Avant
                          90' Coupe Quattro V8 4.2L twin turbo
                          93' //S4
                          83' UrQ
                          97' F250 7.3 diesel

                          Comment


                          • #14
                            Originally posted by a4kquattro View Post
                            that actually means boost leak on the valve/valve seat. the guide shouldn't see any pressure from the combustion chamber with the cylinder @ TDC.
                            Because the seated valves should hold the compression, not the guides, right?

                            I'm the one who just ordered the VEMS and SB Stage 4 clutch with 7a flywheel. Thanks for all the help!

                            Comment


                            • #15
                              Originally posted by a4kquattro View Post
                              that actually means boost leak on the valve/valve seat. the guide shouldn't see any pressure from the combustion chamber with the cylinder @ TDC.
                              thanks Marc! A leakdown test can indicate this symptom right?
                              one of a few I5 from Asia.

                              Comment

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