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  • #46
    Originally posted by RAC View Post
    Sounds good Wroom. Have you found any one cylinder more prone to knock under full load with your engine?
    Simple answer is: It does not knock on full load.

    And why waste a good engine that is hard to get hold of just to see which cylinder is most prone to knock on full load? Especially when there is no gain in upping the ignition above MBT. Leaning the engine would be just dumb, since it is on the spot concerning EGT.

    And there is no reason to run the engine on inferior fuel, since running on V-power gives the best power of the available pump fuels.

    Otherwise, it is most often cylinder number 3 that is most prone to knock on the Imprezas, due to the turbo mounted right behind it, and cylinders 1+3 fuel rail being down stream of the cyl 2+4 fuel rail, unless rebuilt to paralell feed.

    I was expecting a higher tendency to knock on cylinder 3, but it seems not to be obviously easier to force knock on any of the cylinders.

    If the engine had been more prone to knock, and that it would have been one cylinder that knocked most often, then i would have enrichened fuelling and/or set back ignition some on that cylinder to equal out the difference, and so being able to get more power out of it.

    But that is not the case.
    Johan Jansson, +46-708-280832

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    • #47
      Johan do you think it will work as good as on your engine as with a build evo engine that is more noisey?? examples like more engine noise, twin/triple plate rattling in gearbox etc. Or will it constant show knock cause of the extra noise? can you adjust the sensitivity?? Thanks to your positive review, I think am gonna try it.

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      • #48
        My engine will keep making more and more torque around peak torque with more timing right to the edge of knock but higher rpm is as you say, i can go 4-5deg more and make stuff all power more.
        But it is not like this throuth peak torque (4500rpm) with pump gas on my engine.
        Peak torque on my engine has only about 9deg at 1.5bar boost with a 10%meth 98 pumpgas. The engine make 360kw atw in rwd.
        It only takes a slightly less capable fuel to show up problems so i'm always very careful after a gas up, Its amazing how good the simple knock links are when you get use to watching them.

        I don't need to run the engine into hard knock to test it, if the knock board works will it should start picking it up with the onset of very light knock that you can conferm with headphones.

        I'm still keen to know how the knock board is setup for each engine. You say you have a 22b engine so it 96mm bore, I have a 2.5L so 99.5mm bore, was the knock board tested with subaru engines other than the 2L's 92mm bore in mind ?

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        • #49
          Originally posted by Dragracer187 View Post
          Johan do you think it will work as good as on your engine as with a build evo engine that is more noisey?? examples like more engine noise, twin/triple plate rattling in gearbox etc. Or will it constant show knock cause of the extra noise? can you adjust the sensitivity?? Thanks to your positive review, I think am gonna try it.
          Yes, try it.

          No, i don't think it would show constant knock because of the noise. I think it would only show single, or a few, knock events when the noise changes.
          I tested the knock board with a rattling cat plate, and did only get occational single knock events. Whereas a knock link would light up like a christmas tree since it cannot discern between different sounds from the knock sensor, and that it does not monitor engine timing to measure knock within certain timing windows and compare with timing windows that can not have knock.

          But as you say, built EVO engines, and especially stroker engines, with its very hard induction, rattling twin plate clutch, etc. makes the task for a knock sensor very difficult. Having a knock link on a stroker 4G63 is a joke.

          But for stock engine geometry i guess the knock board can lift up lots of torque around 4000 rpm. If the rods and pistons are upgraded. Otherwise, if using full stock 4G63 bottom end, one should not try to get more than what is already easily attainable with good knock margin.

          Originally posted by RAC View Post
          My engine will keep making more and more torque around peak torque with more timing right to the edge of knock but higher rpm is as you say, i can go 4-5deg more and make stuff all power more.
          But it is not like this throuth peak torque (4500rpm) with pump gas on my engine.
          Peak torque on my engine has only about 9deg at 1.5bar boost with a 10%meth 98 pumpgas. The engine make 360kw atw in rwd.
          9 degrees? That sounds rather low even on premium pump gas, if we are talking about an impreza engine. My guess is that the cause of knock is not early ignition timing. Rather something else in the setup, or something happening just before you get to peak torque. Maybe some transient leanspot or something like that? But then of course i don't know how much air mass flow that boost corresponds to in your engine.

          Originally posted by RAC View Post
          It only takes a slightly less capable fuel to show up problems so i'm always very careful after a gas up, Its amazing how good the simple knock links are when you get use to watching them.
          Yes. It's a simple device, but a useful one. Works rather good on the Imprezas.

          Originally posted by RAC View Post
          I don't need to run the engine into hard knock to test it, if the knock board works will it should start picking it up with the onset of very light knock that you can conferm with headphones.
          Of course i haven't induced hard knock on the engine. Only as you say, so much that can be heard with headphones. (If one has good ears).

          Originally posted by RAC View Post
          I'm still keen to know how the knock board is setup for each engine. You say you have a 22b engine so it 96mm bore, I have a 2.5L so 99.5mm bore, was the knock board tested with subaru engines other than the 2L's 92mm bore in mind ?
          The 22B engine is in fact 97 mm bore exactly.

          I will not go into details on things concerning the knock board that has not been officially released.
          Johan Jansson, +46-708-280832

          Comment


          • #50
            MRM, price for PnP for Evo IX with Knock Board?

            is it available?
            Last edited by diablo2184; August 21st, 2009, 12:19 AM.

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            • #51
              Yes they are and there is no need for calibration, they just adapt to each different sensors on the EVO IX.

              We have very good shipping from Sweden to US, just overnight, delivery next day. But I only ship parts that is not available from other dealers. You should get this from your closest US dealer.

              You find closest here http://www.autronic.com.au/Dealer%20...%2023JUN09.pdf
              Robert Jansson
              MRM-Racing

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              • #52
                Well i called a few so-called "dealers" in the states and none of these guys know the difference between a hole in the wall and their ***. I inquired about the knock board, and no one here in the U.S. knows anything about it and they all say its unavailable and not been released. Only one guy was really able to help me out, who was Harvey at Boost Creep. Plus, Autronic's site is no good.

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                • #53
                  I am sure Enzo in NY can help.
                  Robert Jansson
                  MRM-Racing

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                  • #54
                    I have sent you PM and still waiting for reply. Thanks...

                    Comment


                    • #55
                      Originally posted by RAC View Post
                      ..I'm still keen to know how the knock board is setup for each engine. You say you have a 22b engine so it 96mm bore, I have a 2.5L so 99.5mm bore, was the knock board tested with subaru engines other than the 2L's 92mm bore in mind ?
                      The Subaru knock board was tested on various engines including WRX 2L, STI type C and a forged piston 2.5L that you could hear the pistons rocking all the way through a dyno ramp. The knock board detected a bent valve on one engine (that had previously occured in an unfortunate test of launch on a shimmed engine) even though a leak down test didn't.

                      The board is auto adaptive for different engines of the same family and different cylinder levels. The Subaru is worse for this than other engines due to the non symetrical location of the sensor.

                      Buzzard recently had some very impressive results on a modified EVO, but maybe he can report on that separately.

                      Comment


                      • #56
                        Ian, is the knockboard officially out now for the evo? If it is, when will the complete specs will be given? I think a lot of people are interested in the complete specs of the board.

                        Comment


                        • #57
                          Originally posted by Ian View Post
                          The Subaru knock board was tested on various engines including WRX 2L, STI type C and a forged piston 2.5L that you could hear the pistons rocking all the way through a dyno ramp. The knock board detected a bent valve on one engine (that had previously occured in an unfortunate test of launch on a shimmed engine) even though a leak down test didn't.

                          The board is auto adaptive for different engines of the same family and different cylinder levels. The Subaru is worse for this than other engines due to the non symetrical location of the sensor.

                          Buzzard recently had some very impressive results on a modified EVO, but maybe he can report on that separately.
                          Thanks Ian, good stuff.

                          Comment


                          • #58
                            Originally posted by ZLODEY View Post
                            I have sent you PM and still waiting for reply. Thanks...
                            how can I buy this???

                            Comment


                            • #59
                              The knock board is invaluable for early detection once the engine is tuned properly. I have found that I needed to work out what was a true knock as opposed to just noise by listening through a headset. I also found that the 2.5L Subaru engine was more prone to knock from 4 - 5k and had to take out about 4 degrees (15 - 16) to stop knock at anything above 150kPa - 220kPa. I could then add a few degress back in all the way to 7k (20 degrees @ 220kPa using OPTIMAX 98).

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                              • #60
                                Ian I want to buy the knockboard, but I want to see the speclist and features first, could you e-mail me this? My local Autronic dealer does not have any info regarding the knockboard.

                                Buzzard could you please share your recent experience with the knockboard on the modified evo?

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