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Dis Magnus spend his money wisely?

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  • Dis Magnus spend his money wisely?

    Well, looks like it.....
    I plotted all published results from the dyno test plus some data I got from Brad (Athens7) into the same chart. I extrapolated the ends to a round 500 rpm limit and of course there is some inaccuracy from my visually interpreting the dyno charts.

    Please see attached file

    Gert
    Attached Files
    Last edited by slomove; June 29, 2008, 07:37 PM.

  • #2
    >blush<

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    • #3
      I'm very pleased with my dyno tuning, thanks again Magnus. I finally got a chance to take the car on a long drive in the local mountains today, and the bump in torque is very evident. Lots of pull low down!

      Stan

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      • #4
        To add to my post above, another benefit is that my car has much less exhaust smell than it did before. I was apparently running very rich before the tune (O2 sensor head was black). Hopefully this will give me better mileage too.

        Stan

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        • #5
          Gert,

          I'd love to see you compare Robs results to the rest of the chart.

          http://www.blatchat.com/t.asp?Id=153906
          Tom "ELV15" Jones
          http://PIErats.com

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          • #6
            I had a quick look....not sure what to think of that. If I understand it correctly this is just a 2.3l Duratec with modest 270 degree cams. I suppose with ITBs, maybe ported? higher compresssion?.....But still, how is that supposed to output 260 hp @ 7500 rpm on a roller dyno? Is there anything more known about the magic that Ammo did to that engine?

            Or did they calculate back with assumed losses to crank hp?

            Gert

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            • #7
              Rob's is a calculated flywheel figure. Most of the UK dyno shops (including Emerald where Rob had this done) do a coast down measurement to calculate drivetrain losses and then add this back to the figures obtained on the rollers.

              Although the numbers might not be directly comparable to those you folks recorded on your dyno day, the shape of the curve is still an interesting comparison.

              -John
              Westfield SEiW
              2.0L Duratec
              Throttle Steer

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              • #8
                O.K., I can put this into the chart. How much should I deduct? 15% or 20% ?

                Gert

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                • #9
                  According to Bisi: 17% for RWD.

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                  • #10
                    O.K., here it is, 17% reduced.

                    Quite amazing. It matches Magnus' results very well within the accuracy limits of my visual data transfer.
                    I apologize for the illogical reading in some places (Magnus higher in torque, Rob higher in power at 7500 rpm) but once again this was just estimating from the charts and my vision isn't that good anymore 8-)

                    So, the next questions is...Ammo or Cosworth ;-)
                    Attached Files
                    Last edited by slomove; July 1, 2008, 08:09 PM.

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                    • #11
                      my vision isn't that good anymore
                      Nothing quite like science applied w/ poor vision.:D

                      Ammo sent me (unsolicited) a bunch of pics today of the exhaust and the can. The exhaust comes out high like on Jon's car, and the can is much larger and longer, attenuation-like, likely due to all the noise limits that they have to put up w/ there. As opposed to the bad food, ugly scenery, fat people, hot weather and shitty hotels we have to put up w/ here.:D

                      Anyway, numbers are nice, particularly lap times. See ya at the track?
                      Chris
                      ------------
                      A day you don't go a hundred is a day wasted

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                      • #12
                        Originally posted by moosetestbestanden View Post
                        Nothing quite like science applied w/ poor vision.:D

                        Ammo sent me (unsolicited) a bunch of pics today of the exhaust and the can. The exhaust comes out high like on Jon's car, and the can is much larger and longer, attenuation-like, likely due to all the noise limits that they have to put up w/ there. As opposed to the bad food, ugly scenery, fat people, hot weather and shitty hotels we have to put up w/ here.:D

                        Anyway, numbers are nice, particularly lap times. See ya at the track?
                        Chris, you are writing in riddles at times....bad food where? What lap times? See who at the track?

                        Anyway, my Seven isn't going anywhere anytime soon. Block being bored and honed, valves lapped and re-seated right now. And it will take me a little while to bolt it back together again (not as much time as Magnus needed, though) ;-)

                        Gert

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