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Thread: Huge Ford GT LM problem. need help

  1. #1
    Superkart Pilot CastrolGT's Avatar
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    Huge Ford GT LM problem. need help

    hi guys

    I have a huge oversteer problem.
    The Ford GT on Le Mans is a real mess. I don't understand. no matter what I change in the setup, the car still oversteers when I brake, lift, and on high speed like in the Porsche curves. and when I spin, the car gets on its side wheels like if the center of gravity is too high(literrally, I'm sliding on 2 wheels)

    here's the setup:

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    I can manage a 3:55 per lap, but I have to fight the car to avoid the oversteer; it really gets irritating and I'm sure that's not how the car drives IRL(I didn't mean that I know how the car drives IRL, but I really suppose it)
    the only losers are the ones who give up. but that doesn't mean that you don't have to surpass yourself.
    CastrolGT aka Mach
    T500RS + stiffened pedals and permanent DIY hydraulic brake upgrade

  2. #2
    GT4 Pilot AbeWoz's Avatar
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    increase your preload on your differential from 30 to like 80-100. also up your power ramp from 55 to about 75 and see how that goes?
    you might need to run more aero than the other GTE cars so try 2 or 3 on the rear wing.
    ***ALL MY TIRE RELATED DISCUSSION ARE REFERRING TO MODERN GT/LMP TIRES***
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  3. #3
    Superkart Pilot CastrolGT's Avatar
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    ok. I'll try that. but the Ford GT LM is already slower than it real life counterpart(2016) so, it annoys me a bit to put more rear wing. plus, it gets understeery. but I'll try

    EDIT: that did the main trick. but at indianapolis, the right hander, I still get a sudden oversteer even if I brake sooner

    EDIT 2: corrected to right hander instead of left hander
    Last edited by CastrolGT; 14-06-2018 at 21:44.
    the only losers are the ones who give up. but that doesn't mean that you don't have to surpass yourself.
    CastrolGT aka Mach
    T500RS + stiffened pedals and permanent DIY hydraulic brake upgrade

  4. #4
    GT5 Pilot rich1e I's Avatar
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    Try increasing front ride height a bit. Le Mans is pretty bumpy so we need to raise the ride height anyways. Also I noticed your rear anti-roll bars are pretty stiff. Try 30 maybe. Also, try increasing engine braking to maybe 4 or 5. Maybe a bit more camber as well, front&rear. Remove bump stops and see how it handles, but hey, if you have to fight the car and are still getting 3:55s I wouldn't be too concerned ^^ I run less front anti-roll bars and I don't get all that oversteer.

    Edit: I run 65/80 ride height, camber 2.6 /2.3, engine braking 5, anti-roll bars 110/30 and no bump stops. Diff settings 120 preload, 55/35
    Last edited by rich1e I; 14-06-2018 at 21:42.

  5. #5
    Superkart Pilot CastrolGT's Avatar
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    the thing is, it's really dangerous at Indianapolis. the car gets sideways on the right hander. even more when I brake. I tried with more camber, nothing. I've put bump stops because the rear scraped the road there. I'll try with less rear ARB again, but that won't do much, as I already tried that
    the only losers are the ones who give up. but that doesn't mean that you don't have to surpass yourself.
    CastrolGT aka Mach
    T500RS + stiffened pedals and permanent DIY hydraulic brake upgrade

  6. #6
    GT5 Pilot rich1e I's Avatar
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    Just noticed also the suspension could be too stiff. On bumpy tracks like Le Mans or Nordschleife teams run softer setups. Try springs 158/123 and see if it's any better

  7. #7
    Superkart Pilot CastrolGT's Avatar
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    thanks. I'll see that later
    the only losers are the ones who give up. but that doesn't mean that you don't have to surpass yourself.
    CastrolGT aka Mach
    T500RS + stiffened pedals and permanent DIY hydraulic brake upgrade

  8. #8
    GTE Pilot hkraft300's Avatar
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    Reduce your bump stop.
    You’re probably bouncing off them and into the wall. I run 0-5mm in GT cars.
    Also I’d increase rear spring. Try 158/158 front/rear.

    Your compression damping is much higher than rebound. Try the opposite: higher rebound than compression. It’ll help settle the car.
    G29 FFB RAW 70-50-5-10

    What tire compound were you using?
    What was your tire pressure?
    What was the track and tire temperatures?

  9. #9
    GT5 Pilot rich1e I's Avatar
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    Quote Originally Posted by hkraft300 View Post
    Reduce your bump stop.
    You’re probably bouncing off them and into the wall. I run 0-5mm in GT cars.
    Also I’d increase rear spring. Try 158/158 front/rear.

    Your compression damping is much higher than rebound. Try the opposite: higher rebound than compression. It’ll help settle the car.
    The problem is, if you want to reduce ridiculous oversteer increasing rear springs doesn't really help. Aero is a good point. He should try 0/2 and he should be fine. My guess is he wants the ultimate straight line speed with very little camber and aero. The thing is, being 3 or 4 kph faster on the straight doesn't help if you lose 1 or 2 seconds in the Porsche curves. Indianapolis, very tricky. I'm also running 0/1 and the car is very unstable through that section so I'm definitely going for 0/2. More aero also helps with braking and overall stability is better.

    What also happens very often is that people change too many things, that makes it really difficult to tell what made the car handle so badly at some point. In those cases the best thing to do is back to default and start a new setup.
    Last edited by rich1e I; 15-06-2018 at 13:20.

  10. #10
    GT4 Pilot AbeWoz's Avatar
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    your car is setup crazyyyyyy stiff....you have it setup almost like a LMP car.
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    Try the below settings:
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    ***ALL MY TIRE RELATED DISCUSSION ARE REFERRING TO MODERN GT/LMP TIRES***
    PC Rig: intel i7-6700k @ 1.21 gigawatts of electricity | Gigabyte Z170X G1 Gaming | EVGA 1080 Ti SC2 Gaming | Fanatec CSL Elite Base | CSL Elite Load-Cell Pedals | McLaren GT3 Rim
    Other endeavours: lacrosse, hockey, snowboarding, DCS F/A-18C
    The following 2 users likes this Post: hkraft300, VelvetTorpedo


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