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  • Users: Mark944turbo
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  1. Mark944turbo

    What is wrong with my instnataneous torque formulas?

    I thought I had these formulas working and I messed around and lost it If work per cycle = integral of Pressure * dVolume, the most instantaneous work should get done where piston velocity is highest, because dV will be biggest, if you assume constant pressure. So doing that out, my engine...
  2. Mark944turbo

    effect of resistance to tuning

    I am curious about the effect that being in a higher gear, or driving up a hill, has on tuning fuel and timing. Obviously when you spend more time at high load the detonation threshold is lowered and temps increase, but what is the effect of the piston having more resistance to acceleration...
  3. Mark944turbo

    One point of forced induction/NA SI engine comparison

    Hi, I'm looking at one of aspects of SI NA/forced induction engines. Let's say we have a defined RPM and a given amount (mass) of air for every stroke, any AFR, any engine design, WOT and optimal ignition timing (max torque or knock limited). I wonder if a forced induction engine could produce...
  4. Mark944turbo

    Combustion Pressure sensors

    Is there a website out there that actually lists these things for sale? Preferably with prices? I am looking into these as an aid in my engine building/dyno service business. Any help or info is appretiated. I know they are expensive. Thanks
  5. Mark944turbo

    backpressure backpressure

    I remember seeing a formula once that used a bunch of variables to output a maximum backpressure/map ratio, that is, the ratio that if exceeded the motor will start making less torque. At least I think I remember this. Does anyone have this equation or know if it exists? I ask because on a...
  6. Mark944turbo

    Editing Bosch Motronic ECU Eproms

    I am trying to figure out the code in my Porsche 944 turbo's eproms. I want to edit things like the rev-limiter, fuel maps, ignition maps, and overboost protection. If anyone here could give me ANY useful information I would appretiate it. Information on this subject seems hard to come by! Mark

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