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Simota Carbon Air Box Dyno Test

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  • #16
    I think Imran has made a good point as Rolling Roads are generally the only logical method of testing a cars power.

    However, if Exdos claims his mod only with a moving car, then its hard to tangibly find out if it works! Logically though, one thing that can be said, providing the theory behind the exdos mod is true, the car will perform better off the Dyno(the road) than on it....

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    • #17
      Lets not forget ram air effect, if correctly applied will only make a noticable difference in excess of around 80mph, below that a rolling road with a decent fan is more than adquate in displaying the differences between a open style induction kit and the exodus mod.

      For me anyway 0 to 100mph is what its all about, i dont really get the chance to regulary go over 120mph anyway, on the roads around me, hence any improvement at lower speeds will be a bonus and more relavent to me.

      Also i doubt the exodus mod can realistically achieve the sort of power gains you have shown.
      Although i do accept its free and costs nothing.

      Dont forget that the power gains shown were done without the correct level of airflow,
      Maybe the ramair effect could benefit this product too?

      Well lets see the results of Exodus's Exodus mod test

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      • #18
        A rolling road will give a good enough indication but if you want to get a real world result at high speed you need to use F1 technology you need a recording of the engine sound at full tilt in top gear. The sound is then analyzed to give you rpm and power readings which can be very accurate.

        If you stick in a pressure sensor in the air box you might get an increased reading but that means nothing as it’s the pressure at the inlet trumpet and in the intake port in the head that needs to show the increase. On top of that the ecu needs to be programmed to get full effect. If there is any ram effect yes there is a point where a slight increase in air will give you more power but when you start reaching ram effect there comes a point where the ecu on the car won’t be advanced enough or programmed to be able to cope with it and it will be a waste. You also have to be careful you don’t create a stall effect at the point where the air is entering the inlet trumpets. Also the standard inlet manifold hasn’t really been designed to get full effect from any ram air so the best way to get more power is to find a balance on giving the engine just more free flowing air.

        Obviously the exdos mod does work and is an improvement over the standard one but if it’s better then anything else then we can only go buy comparing them on a dyno preferably one with a 120 mph fan unless we can get hold of the F1 boys.

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        • #19
          Here's a very interesting article on air intakes, but unfortunately it's written in that nauseating "for dummies" style. Still a worthwhile read though.

          http://autospeed.drive.com.au/cms/article.html?&A=0629

          Also another article at:

          http://www.vararam.com/ramairinaroadcar.html
          /// Exdos ///
          "Men who try the impossible and fail spectacularly are infinitely superior to those who reach for nothing and succeed" --Napoleon Bonapart

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          • #20
            I believe that someone is going to lend me one, and I will report the findings when I've tried it. Like you, I'd like to see the facts too
            Yep, sensor is ready - I'm just finishing the cal this weekend, seems to work very well (the sensor that is).
            Black 02 reg S54 M Roadster

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            • #21
              I look forward to the results. What would it take to be able to test the effect of "ram air" on the rollers? Bexleys use a fan that simulates wind of up to 100mph if not more.

              Just to add we measured the temperature differences (outside the car, and inside the air boxes) of the standard box and the Simota. Both of them kept the ambient temperature inside the boxes the same as outside the car when driving on the road.

              When we tested a K&N cone filter without a heatshield we found that the metal gauze on the filter actually reatined heat even when travelling at speed.

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              • #22
                The bit that I have a problem with is this: wouldn't BMW have fitted a Gruppe M style (or any other style air intake system) if it thought that they would perform much better on an ///M model car :?: In an earlier posting, THE ANIMAL suggested that we need to use F1 technology to test these things. Does BMW not have access to such technology whereas Simota and GruppeM don't :?:

                Why have BMW used a similar air intake systen in the Z4 MC to that in the Z3 MC if the GruppeM style is better :?:

                Imran,

                Do you have any photos of your Simota air box so that we can see how it gets its air supply?
                /// Exdos ///
                "Men who try the impossible and fail spectacularly are infinitely superior to those who reach for nothing and succeed" --Napoleon Bonapart

                Comment


                • #23
                  Why can Supersprint make exhaust systems that perform better than standard BMW items?

                  BMW are probably restricted by production cost and noise levels to name but 2.

                  I have measured the 2 parameters that are in my capability to measure to demonstrate that this product is effective. If it wasn't I would not have it on my car regardless of the fact that I have some commercial interest in it.

                  I think most people want an induction kit for the noise. If it improves performance that is bonus.

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                  • #24
                    John

                    I will take some pictures tmrw.

                    Comment


                    • #25
                      Originally posted by maahny
                      I think most people want an induction kit for the noise. If it improves performance that is bonus.
                      people buy induction kits and uprated exhausts for a bit of automotive bling!

                      maybe BMW are holding back on the carbon induction systems etc. for stuff like the CSL!

                      they should make a CSL version of every model, bit like the CLK DTM! 8)

                      Comment


                      • #26
                        Originally posted by exdos
                        The bit that I have a problem with is this: wouldn't BMW have fitted a Gruppe M style (or any other style air intake system) if it thought that they would perform much better on an ///M model car :?: In an earlier posting, THE ANIMAL suggested that we need to use F1 technology to test these things. Does BMW not have access to such technology whereas Simota and GruppeM don't :?:

                        Why have BMW used a similar air intake systen in the Z4 MC to that in the Z3 MC if the GruppeM style is better :?:

                        Imran,

                        Do you have any photos of your Simota air box so that we can see how it gets its air supply?
                        Thats like saying, why didn't BMW fit a 5litre v10 to the MCoupe? Where do they stop?

                        There are limits to what BMW aim to achieve and there has to be a compromise between a road going car that is going to make some money and a race car.

                        Remember, the e36 m3 evo was a car produced in high numbers and they felt that it produced enough power to keep buyers happy and to keep it a cut above the competition.

                        Sure, the engine produces lots of power, but its not at its optimum level.

                        There is more power available from that engine, but a series of carefully chosen modifications will extract that power.

                        There is no way that BMW would build the engine to its Maximum output as its got to be a car that can be maintained and used by the masses, not specialist engineers.

                        Comment


                        • #27
                          Originally posted by Rags
                          Thats like saying, why didn't BMW fit a 5litre v10 to the MCoupe? Where do they stop?

                          There are limits to what BMW aim to achieve and there has to be a compromise between a road going car that is going to make some money and a race car.

                          Remember, the e36 m3 evo was a car produced in high numbers and they felt that it produced enough power to keep buyers happy and to keep it a cut above the competition.

                          Sure, the engine produces lots of power, but its not at its optimum level.

                          There is more power available from that engine, but a series of carefully chosen modifications will extract that power.

                          There is no way that BMW would build the engine to its Maximum output as its got to be a car that can be maintained and used by the masses, not specialist engineers.


                          Rags,



                          I'm sure it would have been easier and cheaper for BMW to stick a cone filter on the end of a pipe attached to the MAF with a little shroud around it, like most of the aftermarket "induction" systems, than devise the air intake that the MC actually has, especially if it would work better.

                          I agree with Imran and Ben, I think most people buy aftermarket air-intakes and exhausts primarily for the noise they make, even if that means some systems might be detrimental to their car's performance. If that's what some owners want, then I certainly don't intend to stand in their way.
                          /// Exdos ///
                          "Men who try the impossible and fail spectacularly are infinitely superior to those who reach for nothing and succeed" --Napoleon Bonapart

                          Comment


                          • #28
                            Our rolling road shootout showed most mods didn't work ...... but then it was cold last November and if the car wasnt warm then an unfair reading was taken.

                            Still, Superbow was one of the first there and his car stood for quite a while but still came top with a replica Gruppe M and nothing else.

                            Comment


                            • #29
                              Broccers,

                              I read a very interesting posting on another BMW forum by John Thorne of Thorney Motorsport, explaining the considerable variation in performance that exists between individual cars of the same model. Apparently, not all cars are created equally, and the way they are treated, particularly in their early use, significantly affects ultimate performance capability and engine longevity.
                              /// Exdos ///
                              "Men who try the impossible and fail spectacularly are infinitely superior to those who reach for nothing and succeed" --Napoleon Bonapart

                              Comment


                              • #30
                                Absolutely agree John and you'll always get a huge spread of readings unless you test in exactly the same conditions each time. Our rolling road shootout showed such a spectrum it was unreal.

                                My own thoughts are to leave it well alone while I've a warranty in place and after that who knows.

                                Air kits are worth it for the noise, added power is a bonus.

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