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Can someone explain my dyno results? PICS

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  • #1

    Can someone explain my dyno results? PICS

    I've got a MK4 GTI with a full 2.5" turbo back exhaust, a POD filter and a GFB Hybrid DV Valve (made for the MK4 GTI)

    There are no engine mods, so really other than the exhaust and pod its all stock.

    Car is always serviced and in good condition - never had any problems with it.

    I recently did a chip trial and then dyno'd the car. I did not dyno the car before the retune, though it would have been a good idea.

    The car only got 99.6kw (in 3rd gear) and the the Air/Fuel is around 10.6. Boost drops steadily from 12.6 all the way down to 5psi. The guy doing the dyno said that the boost curve didn't look 'right'.

    I sent these results to the chip manufacturer and they got back to me and said that the lack of boost is because of the after market blow off valve, even though the valve I'm using is a hybrid system and has no leaks.

    Does anyone have any ideas as to why these are the results I'm getting?

    (I've attached 2 pics of the dyno results)

    Thanks guys.

    *EDIT - since been resolved. Page 3 of this post has info*
    Attached Files
    Last edited by blue_reality; 25-04-2009, 07:17 AM. Reason: Car fixed...
    sigpic

    MK4 GTI | MK5 Sportline | 08 Audi S3

    Modify your ride with free DIY videos at www.mightycarmods.com
    Tags: None
  • #2
    why does the graph start at 4k????

    what sort of result was you looking for?

    how does the car drive? does it feel better?
    I am asking that because i have a mate with a 2.1 8v mk1 and it NEVER performs on a rolling road but when you drive the car it is silly quick.
    Velly
    '91 2.0 8v GTI

    Originally posted by DubSteve
    I have wood thinking about you

    Comment

    • #3
      Do a stock dyno run & overlay the graphs.

      Depending on dyno setup, maybe its a massive gain over stock, or it could also be a massive loss over stock.

      sigpic

      Comment

      • #4
        AF ratio seems a little off to me.... anyone else?


        i like volkswagens
        My blog: http://garagefiftythree.blogspot.com.au/

        Comment

        • #5
          Running lean to me. AFR should be 12 or even a little more for safety. Especially with that little boost, that's messed up.

          Maybe whoever did the chip is tryina say that the spring in the BOV is so weak it's opening when it shouldnt? Would be a stupid thing to say though....
          I'd stick the stock BOV back on it, do it again, then ask them for some answers...

          Comment

          • #6
            Originally posted by D3bb4 View Post
            Running lean to me. AFR should be 12 or even a little more for safety. Especially with that little boost, that's messed up.

            Maybe whoever did the chip is tryina say that the spring in the BOV is so weak it's opening when it shouldnt? Would be a stupid thing to say though....
            I'd stick the stock BOV back on it, do it again, then ask them for some answers...
            That's exactly what they are saying - but while on the dyno we checked for leaks and also wound the spring up on the BOV so it was only releasing on a very high load.

            The chip is one of the big brands and they are confident that it is not their tune as they have done it to heaps of cars. So could there be any other options?
            sigpic

            MK4 GTI | MK5 Sportline | 08 Audi S3

            Modify your ride with free DIY videos at www.mightycarmods.com

            Comment

            • #7
              What should a MKIV GTI be looking at in stock form?

              Comment

              • #8
                Originally posted by D3bb4 View Post
                Running lean to me. AFR should be 12 or even a little more for safety. Especially with that little boost, that's messed up.

                Maybe whoever did the chip is tryina say that the spring in the BOV is so weak it's opening when it shouldnt? Would be a stupid thing to say though....
                I'd stick the stock BOV back on it, do it again, then ask them for some answers...
                Think you might be getting a bit mixed up there, 10.6 is richer than 12 mate, head towards Stoich 14.7 and you are lean.
                Jmac
                Alba European
                Service, Diagnostics and repairs. Mobile Diag available on request
                Audi/VW/Porsche Factory trained tech 25+ yrs exp
                For people who value experience call 0423965341

                Comment

                • #9
                  Originally posted by Jmac View Post
                  Think you might be getting a bit mixed up there, 10.6 is richer than 12 mate, head towards Stoich 14.7 and you are lean.
                  Jmac
                  Yea, from my limited knowledge, 10.6 is WAY rich. over 14.7 [stoich] is lean, ie 15.6 etc.

                  Boosted applications generally should run about 12.5-13.5. Generally where the most power is on bell curve [power vs AFR graph] I reckon it's lost power cause it's running too rich. just imho


                  i like volkswagens
                  My blog: http://garagefiftythree.blogspot.com.au/

                  Comment

                  • #10
                    what chip was it??

                    Comment

                    • #11
                      get rid of the blow valve
                      it leaks, regardless you can see it or not
                      the spring is much weaker in it and does not hold boost properly

                      put your stock dv and try again or get a GFB plumback, if you want sound get an AEM Intake or a like.

                      i noticed when i had that bv, i lost 3-4psi
                      What’s behind you doesn’t matter..

                      Comment

                      • #12
                        Originally posted by Jmac View Post
                        Think you might be getting a bit mixed up there, 10.6 is richer than 12 mate, head towards Stoich 14.7 and you are lean.
                        Jmac

                        too true. was on train this morning thinking i got that backwards oopse! it was late

                        Comment

                        • #13
                          I'm going to go 100% plumback and redyno after checking over the system. Will let you all know results.

                          Thanks for the PM's Fuzion and Bug_Racer.
                          sigpic

                          MK4 GTI | MK5 Sportline | 08 Audi S3

                          Modify your ride with free DIY videos at www.mightycarmods.com

                          Comment

                          • #14
                            Originally posted by fuzion View Post
                            get rid of the blow valve
                            it leaks, regardless you can see it or not
                            the spring is much weaker in it and does not hold boost properly

                            put your stock dv and try again or get a GFB plumback, if you want sound get an AEM Intake or a like.

                            i noticed when i had that bv, i lost 3-4psi
                            My car has been running perfectly fine with my BOV for ~50,000kms.

                            *knock on wood*

                            Comment

                            • #15
                              Originally posted by SoVeReIgN View Post
                              My car has been running perfectly fine with my BOV for ~50,000kms.

                              *knock on wood*
                              dave, maybe because i have more mods? who knows.
                              what did you dyno at anyhow? as your 24psi from sig, im only 18/19!
                              What’s behind you doesn’t matter..

                              Comment

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