introduction and dyno results: What do you think

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  • bogreg
    S2Forum Hobbyist
    • May 2008
    • 21
    • Country: Hungary

    #1

    introduction and dyno results: What do you think

    I have been reading the forum for quite some time, so first of all let me thank you all for the incredible amount of useful information that is available here.
    My car is 1995 RS2 with 168k km in the clock, overall pretty good condition. For a year and a half now I have tried to make it as close to orginal condition as possible. She is completely stock, apart from a VDO pressure gauge installed in the dash.
    Here are some pictures with the winter wheels on:








    There are some more, if anyone is interested: http://indafoto.hu/bogreg/alap_album

    There are still a few things to solve however. I have taken the car for remapping and also to check how it performs on a dyno.

    This is what we got:


    What do you think?
    First about the stock (pink) performance. It seems to have quite accuratly met stock power levels. What I find a bit strange however is the torque curve starting to climb so late. Audi claims some 400+ Nm from 2800...well, mine seems to have produced the same levels, but a 1000 rpm later. But checking dyno results of others I can see many similar curves. (Although it is difficult to find a stock one here...) Is this how it should be or is it that my turbo has got "lazier" in 15 years? (No fumes, no play in the axle, seems to be OK, but who knows)

    And the mapping? We have had some difficulties in programming the boost chip, maybe this is why it drops to stock 1? bar at the end of the curve. The smaller loss in power at low rpms is not nice, but it could be the result of higher air (intake) temperatures after 2 hours of dyno mapping. (The first run was with the stock chip)
    I have the same problem here: I am basically satisfied with this power, but I'd prefer a an earlier climb and probably a higher top end as well. What do you think? Am I expecting too much of an old K24 7200 or could it be improved without replacing too many parts?
  • quattro
    S2Forum Maniac
    • Dec 2004
    • 768
    • Home: Wales Current: England

    #2
    Un ability to be able to breate at top rpm's and slower than expected spool up may be that your cats are starting to perish on them selves and are cloging up?
    Probably the longet S2 project in history EVER!

    Comment

    • Le S2 Audi
      S2Forum Possessed
      • Jul 2009
      • 3805
      • Home: Scotland Current: England

      #3


      Nice looking car...

      Wish we got proper climate control on UK spec cars....

      sigpic

      New S2 - S8 & RS2 -RS6 Keyrings

      Comment

      • bogreg
        S2Forum Hobbyist
        • May 2008
        • 21
        • Country: Hungary

        #4
        I have thought of that as well, but how can it be tested?

        Comment

        • bogreg
          S2Forum Hobbyist
          • May 2008
          • 21
          • Country: Hungary

          #5
          Thanks. I can see UK cars seem to have has some strange specs. I guess it takes quite a lot more work than just replacing the control panel to change it

          Comment

          • bogreg
            S2Forum Hobbyist
            • May 2008
            • 21
            • Country: Hungary

            #6
            Can anyone post a dyno of a stock or (only) chipped RS2 to compare the curves with mine?
            Has anyone ever tried to replace the turbo only (with something of more recent tech.) and leave all other parts EM, IM, exhaust, IC unmodified and see how it improves spool and lag? I have had a GT3071 installed in my previous car, but since there were so many things changed already, it is difficult to tell how each of the elements contributed to the overall results.

            Comment

            • GazzaG60
              S2Forum Freak
              • Mar 2007
              • 4133
              • Country: United Kingdom

              #7
              id expect maybe a little more of a plataeu at the top of the torque curve though no expert on RS2.

              similar size to a td04 turbo and they graph like that.

              Comment

              • GazzaG60
                S2Forum Freak
                • Mar 2007
                • 4133
                • Country: United Kingdom

                #8
                sorry meant td05

                Comment

                • Jamo
                  Retired OG Mod
                  • Mar 2004
                  • 21750
                  • Country: United Kingdom

                  #9
                  S2avant and Sal_S2 both have dyno results over 350 bhp with stock RS2 ecu and 3" exhaust, worth asking them

                  Comment

                  • porkkis
                    S2Forum Extremist
                    • Aug 2003
                    • 1994
                    • Country: Finland

                    #10
                    Audi figures have been done on engine dyno by braking the engine starting from upper revs...

                    Here is a dyno plot of a completely standard RS2 running generic porkkis chipset. These have been developed by me and available from me.
                    Attached Files
                    -

                    Comment

                    • bogreg
                      S2Forum Hobbyist
                      • May 2008
                      • 21
                      • Country: Hungary

                      #11
                      Originally posted by GazzaG60
                      sorry meant td05
                      Is that a Mitsubishi turbo? You mean similar in max power levels and torque curve on a 2.0l?

                      Comment

                      • bogreg
                        S2Forum Hobbyist
                        • May 2008
                        • 21
                        • Country: Hungary

                        #12
                        Thanks Jamo, I'll try to contact them, but looking at the diagramm porkis posted it seems that this is more less the limit of the standard setup spoolwise... Now I guess I am at the question of how to improve it then - which turbo topic...

                        Comment

                        • bogreg
                          S2Forum Hobbyist
                          • May 2008
                          • 21
                          • Country: Hungary

                          #13
                          Originally posted by porkkis
                          Audi figures have been done on engine dyno by braking the engine starting from upper revs...

                          Here is a dyno plot of a completely standard RS2 running generic porkkis chipset. These have been developed by me and available from me.
                          Thanks porkkis for the plot. Starting from upper revs? That is quite a strange way to measure power levels to me, but seems like an explanation for the huge difference. Looking at your plot however it seems very similar to mine in terms of spool/lag, although you are probably using more pressure to achieve these higher torque levels. It seems that what I am after is not really a chip, but a quicker, more responsive turbo. It just difficult to decide which one - I don't want to change the exhaust for anything louder and would like to keep the engine bay as original as possible...

                          Comment

                          • GazzaG60
                            S2Forum Freak
                            • Mar 2007
                            • 4133
                            • Country: United Kingdom

                            #14
                            yes its a mitsu. stock on an ej20t up to 97. impreza only. IIRC a pre 93 legacy (the swap year to impreza) was a IHI vf12.

                            creates a similar curve.

                            the extra cc dont do much on boost anyway. we are after all governed by boost and flow.

                            looking at porkkis graph id say its about there.

                            rumour has it the stock chips aint too good so you should be able to hang onto the power a little longer with a better chipset. jamo is on the money though if its a stock exhaust.

                            for reference, i know not audi, a change on the subaru from 2.5 to 3" made about 50hp. also about 500rpm sooner spool on. non stock turbo.

                            Comment

                            • urS6Tom
                              S2Forum Maniac
                              • Mar 2009
                              • 773
                              • Country: United Kingdom

                              #15
                              Slightly off-topic but that is a MINT looking interior!

                              What do you use to keep it looking so new? Or has the car only got 20k miles on it??

                              Comment

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