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The downshift bug

Discussion in 'Simracing Team Challenge' started by Roland Ehnström, Mar 29, 2013.

  1. First post here... Hi all! :)

    Have you noticed the infamous McLaren gearbox issue, where the car sometimes jumps into neutral if you blip the throttle while shifting down?

    If yes, let iRacing know, to get this problem fixed ASAP: http://members.iracing.com/jforum/posts/list/3095885.page

    This problem could cause mayhem in a 40-car field...
    • Like Like x 1
  2. Bram

    Roaring Pipes Maniacs | #27 Staff Premium Member

    Hey Chevyman :)

    I was thinking huh first post? But you were on of those 20K people with a strange character in their username that messed up our import from vbulletin to xenforo forums 1 1/2 years ago and had to be removed. Welcome back :)

    Noticed this strange behavior as well, very nice when you approach that sharp turn on Sebring :)
  3. Thank you! Hmm, it never ceases to amaze me how in the 21st century a couple of dots above a circle can still cause so many problems! :O_o:
  4. Bram

    Roaring Pipes Maniacs | #27 Staff Premium Member

    I left mine out Hängefjöld -> Hengeveld, much easier :)
  5. So that's how your name is actually spelt Bram... my life is a lie. :cry:

    On the subject of the bug... I'm not sure if it's really a bug. The McLaren has auto-blip, so you shouldn't have to blip the throttle yourself. I think I also read somewhere that getting stuck in neutral is sometimes because of the driver not "pulling" on the paddle/gearstick long enough for the next gear to engage.
    I've experienced the gearbox freaking out on me a few times and I've mostly gotten around it by being firm with my pressing of shifting buttons and staying off the throttle when braking.

    But I don't know, maybe it is a bug and I'm just living in my own little world where there is a firm solution to every problem... :p
    • Like Like x 1
  6. What makes me see this as a bug rather than a strange "feature", is that I believe it's simply physically impossible for a real sequential gearbox to jump directly from 3rd gear to neutral. Correct me if I am wrong.

    It is absolutely true that you should not blip the throttle by yourself in the McLaren. You should let the electronics do it for you. And if you let the semi-automatic work it's magic, the gearchanges are just fine. However, sometimes the car will get unstable under braking, and the only way to get the rear back in shape is to apply a little bit of throttle. It's when you are unlucky to do this while also changing down a gear, that the gearbox sometimes gets stuck in neutral.

    This is a different problem: On the upshifts, you have to press and hold the paddle for a tenth or two (not just tap it). In an earlier build, when you just tapped the upshift paddle, the gearbox could also end up in neutral. This problem has since been fixed; now when you don't press the paddle long enough, the next gear will simply not engage, you stay in the previous gear, but you no longer end up with a box of neutrals.

    What I am looking for, is a similar fix for the downshifts.
  7. Kevin Ascher

    Kevin Ascher
    #47 Roaring Pipes Maniacs

    Isn't this what the anti-stall does in F1 cars?
  8. Does it not simply engage the clutch?
  9. Bram

    Roaring Pipes Maniacs | #27 Staff Premium Member

    And yours is Rjüs Gjärdïnär :)

    On the topic of the car handling: i find the ridiculously low grip levels more disturbing than the shifting-bug.

    Also do the real drivers in GT3 never apply the throttle for a film bit of blipping?
  10. Kevin Ascher

    Kevin Ascher
    #47 Roaring Pipes Maniacs

    I am not sure. in German TV they always say it puts the gearbox into neutral.
    Besides that, they have a neutral button o their steering wheel.
  11. True, but I always thought they need to be in first gear before pressing that button, else nothing will happen. Not sure how it works really.

    Either way, I find it hard to believe that the real McLaren gearbox leaves the driver in neutral if he touches the throttle while shifting down.

    Bram, if you measure the grip in cornering force, this car has plenty of grip, I belive it's pulling in the region of 2 G in the corners. It's more the handling that is, well, tricky. :) Especially how the rear behaves in the slow chicanes. Once the rear starts to slide you have to slow way down to reel it back in. But it's a nice challenge - the car feels very "alive", which is a good thing.
  12. Well didn´t Hamilton pushed the Neutral button in Interlagos in 2007 by mistake in turn 3? Talking about F1 there.

    To me it feels as a bug aswell, I can´t believe the car goes to neutral like that in real life, as you loose all the engine breaking power and it could make it really dangerous if you don´t notice that on time.
  13. It happened to me in the middle of T1 in practice yesterday, not very pleasant... :confused:
  14. Risto Kappet

    Risto Kappet
    Premium Member

    Im having a slightly related problem: often i need to doubleclick to shift down in Interlagos, especially on trailbraking, mostly from 4th to 3rd and 3rd to 2nd. Very uncomfortable as i already get used to doubletapping the downshift, but sometimes the bug doesnt happen so i go down 1 too much, also the car revs dont sound too vivid so its hard to tell, also wheel covers the gear indicator etc :D
    Same problem with both no aids, autoclutch and autoblip. Using sequential, definatly not hardware problem as i can tap gears with 100% accuraccy while stationary.
    EDIT: fixed, i was downshifting too early. If the car senses it will overrev, it wont even start a shift.