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  1. Replies
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    I think a major issue is whether the 'kit car'...

    I think a major issue is whether the 'kit car' teams can (or do) score highly in the competition overall.

    A perfectly legal strategy for FSAE is to ignore the Design event (and the associated...
  2. Thread: Slip Sensor?

    by murpia
    Replies
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    10,083

    Just curious as to why you think it needs to be...

    Just curious as to why you think it needs to be real time?

    I would have thought syncing the video recording to the other data recorded on the car could be done in post processing on a workstation...
  3. Thread: Slip Sensor?

    by murpia
    Replies
    17
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    10,083

    If you have a GoPro, why not just video the track...

    If you have a GoPro, why not just video the track surface and post process using an optical flow algorithm?

    Or try one of these: http://www.unmannedtechshop.co.uk/optical-flow-sensor-board/
    ...
  4. Replies
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    Off Topic...

    Mmm, multi-track drifting....

    https://www.youtube.com/watch?v=86PUB4u2s2A
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    Wow, expensive...

    Wow, expensive...
  6. Thread: 2015 FSAE Rules

    by murpia
    Replies
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    114,380

    At one point in FSUK, changing car setup between...

    At one point in FSUK, changing car setup between dynamic events was encouraged. That contradicts the 'T1.2.3 The vehicle must maintain all required specifications, e.g. ride height, suspension...
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    Hi, I think the ground current issue is likely...

    Hi,

    I think the ground current issue is likely to be the cause, as well. But, it could also be related to a drop in the TPS supply voltage, which the ECU itself is robust to because it uses a...
  8. A controlled, variable fuel pressure could keep...

    A controlled, variable fuel pressure could keep the fuel pulse more constant in the engine cycle crank angle domain, as rpm rises. That _could_ maintain a better fuel mix than allowing the pulse to...
  9. Replies
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    Not a problem, only 2 countries in the world...

    Not a problem, only 2 countries in the world don't work in metric.

    Not knowing how to convert from inch to mm? Now, that's a problem... :)

    Regards, Ian
  10. Agreed. 'Sequential' ignition is mainly related...

    Agreed. 'Sequential' ignition is mainly related to dwell times, i.e. at really high revs you may have to charge the coil for longer than one engine revolution. Or you need it when you have unequal...
  11. Yes, for clarity, per-engine-revolution batch &...

    Yes, for clarity, per-engine-revolution batch & wasted spark are absolutely fine in my opinion too. And good for reliability although in my opinion there's no excuse for an ECU not to cope with loss...
  12. Hi Kirk, MoTeC may well have additional tuning...

    Hi Kirk,

    MoTeC may well have additional tuning & ECU hardware support for PWM'd and / or Peak & Hold injectors ('low Z'). I think for FSAE most hardware for novice teams will be 'saturated'...
  13. Thanks for the plot Loz. The issue that I'm...

    Thanks for the plot Loz.

    The issue that I'm trying to communicate, and apologies for any repetition, is that you should not simply tune the total pulse width against battery voltage.

    The...
  14. Kirk: do you have a reference for the reduced...

    Kirk: do you have a reference for the reduced flow effect of low battery voltage? I never heard that before, I understood the preload of the pintle return spring pretty much made for a two position...
  15. I would agree that TPS can be easier to get going...

    I would agree that TPS can be easier to get going with, but if you can go with MAP then this is more robust.

    Small variations in butterfly angle can create large airflow differences. If your TPS...
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    Hi Z, Presumably if you factor in body slip...

    Hi Z,

    Presumably if you factor in body slip angle (approx. rear tyre slip angle neglecting toe), the effect is even greater?

    Regards, Ian
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    One-way clutches have been used in RC racing,...

    One-way clutches have been used in RC racing, both on-road and off-road since at least 1984 as far as I know and probably earlier than that. Rather than 'getting away with it' with it's implication...
  18. Thread: anti dive setup

    by murpia
    Replies
    76
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    74,654

    Nor in many other formulae. One thing that does...

    Nor in many other formulae. One thing that does need reinforcing though is the ability of the suspension to distribute forces accurately. Non-engineers (or poor ones) will equate lack of suspension...
  19. Thread: anti dive setup

    by murpia
    Replies
    76
    Views
    74,654

    This is number one on my list of transient...

    This is number one on my list of transient vehicle dynamics effects to study should I ever get the opportunity to do some multi-body dynamics modelling. Drag racers use >100% anti-squat to generate...
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    This is especially true of turbo-shafts for...

    This is especially true of turbo-shafts for helicopters, which don't need to be concerned with frontal area, or having their air intakes at the front.
    ...
  21. Thread: AMG 595 Engine

    by murpia
    Replies
    13
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    11,320

    Why did they not put any suspension mounts on...

    Why did they not put any suspension mounts on those gorgeous castings???...

    Regards, Ian
  22. The newer models are infra-red... stealthy.... ...

    The newer models are infra-red... stealthy....

    Regards, Ian
  23. The M6 stud is not ground, it's power (PDM...

    The M6 stud is not ground, it's power (PDM outputs are high-side drivers).

    Multiple connector pins, whether power, output or ground are problematic. Sooner or later, despite all the warnings in...
  24. Thanks for the comments, I think I will go with...

    Thanks for the comments, I think I will go with the M6 stud initially.

    I have an opportunity next week to do some PCB layout. After that I should be able to indicate dimensions accurately, but my...
  25. Just a query on the main power connection (needs...

    Just a query on the main power connection (needs to supply up to 85A continuous).

    I was planning an M6 stud like the MoTeC units. But another option is a connector like this:
    ...
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