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EU Formula 3 @ Floripa - Wed 15Nov17

Discussion in 'Automobilista Racing Clubs & Leagues' started by Ross Garland, Nov 7, 2017.

Added to Calendar: 15-11-17
  1. CMGARAGE

    CMGARAGE
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    I mentioned some of the parameters of engine wear in last weeks Curvelo race thread with Dan, although it was more aimed at his temp management.

    There's two main factors that impact wear; temps and revs. With a 6 radiator you should've of been good for temps. It seems keeping oil under 110celsius is advisable. I couldn't see your motec or see any temps on the HUD but 6 should easy keep you at safe levels.

    The most likely cause is too many revs on downshifts. If any point revs are calculated to be above 8500rpm the engine will die immediately. You are rev limited to 7250rpm so you can only go above this with aggressive downshifting. You also get a wear factor of 50 for each second you are above the rev limit.

    If you save you replays watch your rev readout (top left) as you downshift. If it goes beyond 8500 it's an instant blowout and couldn't be avoided. If it's general wear you can adapt your driving slightly to improve engine life. :)
     
    Last edited: Nov 15, 2017
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  2. Tero Dahlberg

    Tero Dahlberg
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    I would put money on too fast downshifts. The revs go off the charts, literally, when you watch the tacho while you downshift through the gears.

    You gear spacing seems a bit odd too. I think they are quite close together and that leaves 6th quite long. Which also makes it so that you have to downshift through more gears for tighter corners.
     
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  3. KODIAK

    KODIAK
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    I'll revert to stock for next race. tbh, they were killing me in that big left sweeper.

    ill check.

    *so I watched that replay, and I never went anywhere near 8500rpms

     
    Last edited: Nov 15, 2017
  4. Martin Fiala

    Martin Fiala
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    Oh yeah, I completely forgot - sorry about that tap in the first chicane at the start, @Steve Le Gallez - it was a bit of an accordion effect there, but still, I should've been more careful...
     
  5. Steve Le Gallez

    Steve Le Gallez
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    No worries mate, not your fault :thumbsup:
     
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  6. ionONE1

    ionONE1
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    I looked at the message someone posted during the race on the other screen, should not distract me but it did, missed the braking point and decided to stop.
     
  7. Craig Patteson

    Craig Patteson
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    Shame mate we were having a really good battle you were much faster after the pitstop
     
  8. ionONE1

    ionONE1
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    I thought i can do this without a pitstop, had a full tank but tires were melting to fast.. only thing i could do was to force you to pit early for fuel, worked out but i was never going to overtake with 23/23 wing.
     
  9. Tero Dahlberg

    Tero Dahlberg
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    But if you keep constantly overrevving on downshifts it'll eventually blow up the engine. You go over 7300 rpm each time and there are these lines in the engine file:
    EngineHyperWearMinRPM=7250 //Min revs to wear the engine EngineHyperWearFactor times faster
    EngineHyperWearFactor=50
    EngineInstantBlowUp=8500
     
  10. Tero Dahlberg

    Tero Dahlberg
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    Out of curiosity, and for reference, as I had never paid attention going over 7250 rpm, I loaded Motec and checked my telemetry. I spent a total of 0,332 seconds above 7250! Of which 0,293 s happened on the warmup lap for some reason :D
     
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  11. Dan ONeill

    Dan ONeill
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    Probably the start of the line?
    This subject is interesting and should help people who blow their engines. Better armed with the knowledge than guessing...
    Cheers
     
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  12. KODIAK

    KODIAK
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    From this I gather that I was effectively wearing down my engine every time I was going over 7300, which I did quite a few times, and it finally gave out?

    My next question is should I have tighter gearing for 1-2-3 or 4-5-6
     
  13. Tero Dahlberg

    Tero Dahlberg
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    Well that is my assumption, based on that downshifting in that one corner. I assume you did it more or less the same way every time and possibly for other corners too. I'll look a bit more of your video at some point. And well you can do it too :D

    As for the gearing... I think the engine is very very forgiving regarding gear spacing as it has a very wide torque peak, more of a plateau actually. Blue is torque, red is HP. I think "redline"/limiter is at 7250 btw. So at least in my understanding it doesn't make a world of difference where between 5000 and 6250 your RPM drops down to when shifting up.
    [​IMG]

    If someone disagrees or knows I'm wrong, please say something :)