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Thread: BMW M3 GT4 setup enquiry

  1. #11
    GT3 Pilot blinkngone's Avatar
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    Quote Originally Posted by warhammer2 View Post
    I have tried this setup and found it much better than my previous one. However tire temps still around 87-92 when hot.
    Brakes i keep around 500 front 460 rear range when i start braking。。
    Gear final i keep at default value as I find 4.1 is too low.
    how should I tune radiator opening? There is an engine symbol and always green. I suppose if I close it abit i should get faster.
    Hi, glad you are making progress, I was worried because with all the camber heathen's is more of a Loose setup and you had been driving Stable so good for you, Loose is faster. Sorry, I think you are stuck with the tire temps because of the track.

    I would guess you could be closing the radiator to 20%, where are you now? Changing the ride height would give you more speed down the straight than reducing the radiator opening under 20%.

    On the Engine symbol the middle number will show damage from overheating, over 20% after a couple(EDIT: sorry about 5 laps) laps will mean the opening is too small.

    Radiator change from 20% to 10% improvement is 0.100.
    Ride Height change from heathen's to 105/100 rear improvement is 0.200.
    Last edited by blinkngone; 23-01-2019 at 13:24.
    Bikes wrecked-77 Suzuki RM125, 78 Honda Elsinore 250, 81 Honda CB900F, 2000 Kawsaki ZX12R(2), 2001 Honda F4I, 2005 Yamaha R1. A bike hasn't been made I couldn't wreck, spectacularly, but I'm retired now.

  2. #12
    GT3 Pilot blinkngone's Avatar
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    Because I am bored again I decided to check on the effects of toe on top speed and tire wear. I used the AMG GT3 at the Tri-Oval. I checked the toe used on the WR run by Kramarsky at Monza GP, -0.3 front and +0.4 rear, used those. He uses more toe than others, especially on the rear, typically and is pretty fast as well.
    Top speed not much of a negative impact.
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    Tire wear not much of negative impact after 10 laps. After 10 laps my lap time was the same as my first lap.
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    Top speed Huracan.
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    Tire wear after 10 laps. The Huracan doesn't appear to tolerate toe as far as tire wear as well as the AMG.
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    Well apparently the 650 S doesn't tolerate higher toe as well as the AMG or Huracan.
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    Last edited by blinkngone; 24-01-2019 at 01:36.
    Bikes wrecked-77 Suzuki RM125, 78 Honda Elsinore 250, 81 Honda CB900F, 2000 Kawsaki ZX12R(2), 2001 Honda F4I, 2005 Yamaha R1. A bike hasn't been made I couldn't wreck, spectacularly, but I'm retired now.

  3. #13
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    Interesting testing blink, I thought I'd do some tests in a regular circuit as well. I just did 5 laps in Watkins with the AMG GT3, first with completely default setup (toe at -0.2 / +0.2 front/rear) and then only increased negative/positive toe to -1.0 / +1.0. With similar pace (was doing high 1.43s) after all tires were on temperature, I saw those results:

    - At the start/finish line, after completing the 5th lap, tire pressures were identical in both tests (1.80 , 1.75 / 1.77 , 1.75 front/rear)
    - At the same place, surface tire temps were also almost identical for both tests (108C , 104 / 108 , 104 in default - 108 , 103 / 109 , 101 with +/-1 toe)
    - Tire wear for rear tires was practically identical (3.3% , 3.4% in default - 3.5% , 3.5% with +/-1 toe)
    - Tire wear for front left tire was almost identical, but interestingly it was a little (10%) higher for the front right in the second test (5.1% , 5.1% - 4.9% , 5.6%)

  4. #14
    GT3 Pilot blinkngone's Avatar
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    Hi, I also made a couple of ride height runs with the AMG. Starting with minimum F/R and increasing by 5 mm there was only a minor impact unlike the BMW GT4. I believe there was a feeling that toe changes contributed to excessive tire wear which is why I wanted to check. So it's true for some cars but not others, you would need to test.

    As usual the BMW GT4 doesn't like toe changes either.
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    Last edited by blinkngone; 24-01-2019 at 08:49.
    Bikes wrecked-77 Suzuki RM125, 78 Honda Elsinore 250, 81 Honda CB900F, 2000 Kawsaki ZX12R(2), 2001 Honda F4I, 2005 Yamaha R1. A bike hasn't been made I couldn't wreck, spectacularly, but I'm retired now.

  5. #15
    GT3 Pilot blinkngone's Avatar
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    With toe changes, Ducts and Radiator opened up the AMG is still pretty good. The 650 S is however very sensitive to these changes.
    AMG.
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    650 S.
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    Huracan.
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    BMW.
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    Renault R.S.01 GT3
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    911 GT3 R.
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    Ginetta G55 GT3.
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    Last edited by blinkngone; 24-01-2019 at 14:53.
    Bikes wrecked-77 Suzuki RM125, 78 Honda Elsinore 250, 81 Honda CB900F, 2000 Kawsaki ZX12R(2), 2001 Honda F4I, 2005 Yamaha R1. A bike hasn't been made I couldn't wreck, spectacularly, but I'm retired now.

  6. #16
    GT3 Pilot blinkngone's Avatar
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    Quote Originally Posted by cpcdem View Post
    Interesting testing blink, I thought I'd do some tests in a regular circuit as well. I just did 5 laps in Watkins with the AMG GT3, first with completely default setup (toe at -0.2 / +0.2 front/rear) and then only increased negative/positive toe to -1.0 / +1.0. With similar pace (was doing high 1.43s) after all tires were on temperature, I saw those results:

    - At the start/finish line, after completing the 5th lap, tire pressures were identical in both tests (1.80 , 1.75 / 1.77 , 1.75 front/rear)
    - At the same place, surface tire temps were also almost identical for both tests (108C , 104 / 108 , 104 in default - 108 , 103 / 109 , 101 with +/-1 toe)
    - Tire wear for rear tires was practically identical (3.3% , 3.4% in default - 3.5% , 3.5% with +/-1 toe)
    - Tire wear for front left tire was almost identical, but interestingly it was a little (10%) higher for the front right in the second test (5.1% , 5.1% - 4.9% , 5.6%)
    Hey, are the tire temps unusually high in your runs?
    Bikes wrecked-77 Suzuki RM125, 78 Honda Elsinore 250, 81 Honda CB900F, 2000 Kawsaki ZX12R(2), 2001 Honda F4I, 2005 Yamaha R1. A bike hasn't been made I couldn't wreck, spectacularly, but I'm retired now.

  7. #17
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    Quote Originally Posted by blinkngone View Post
    Hey, are the tire temps unusually high in your runs?
    No it was the same, no matter the toe value I used. But I only tried with this car (AMG)..

  8. #18
    GT3 Pilot blinkngone's Avatar
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    Ok, didn't know if those are normal temps. Been thinking about changing my name from blinkngone to Loctite 242.
    Bikes wrecked-77 Suzuki RM125, 78 Honda Elsinore 250, 81 Honda CB900F, 2000 Kawsaki ZX12R(2), 2001 Honda F4I, 2005 Yamaha R1. A bike hasn't been made I couldn't wreck, spectacularly, but I'm retired now.

  9. #19
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    Quote Originally Posted by blinkngone View Post
    Ok, didn't know if those are normal temps. Been thinking about changing my name from blinkngone to Loctite 242.
    They are a bit hot, but hard tires manage that. During the lap they get even higher at 115C in the corners, but never lose too much grip. With soft tires (at least the GT3 onrs) it would had been a pain going at such temps though...

  10. #20
    GT3 Pilot blinkngone's Avatar
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    Quote Originally Posted by cpcdem View Post
    They are a bit hot, but hard tires manage that. During the lap they get even higher at 115C in the corners, but never lose too much grip. With soft tires (at least the GT3 onrs) it would had been a pain going at such temps though...
    Ok, do you know anything about Zhuhai? He is in the high 80s, could he possibly use Soft tires?
    Bikes wrecked-77 Suzuki RM125, 78 Honda Elsinore 250, 81 Honda CB900F, 2000 Kawsaki ZX12R(2), 2001 Honda F4I, 2005 Yamaha R1. A bike hasn't been made I couldn't wreck, spectacularly, but I'm retired now.

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