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Suspension Tuning Discussion/Tips Thread

Discussion in 'General Discussion' started by derpfleet55, May 5, 2016.

  1. derpfleet55

    derpfleet55
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    Ever since tuning has been added to the game there is tons of potential to set up cars for a variety of uses.
    This thread is for those who want to discuss tuning, what works, what doesn't work, what could be done better, etc etc etc...

    As for how to contribute you can either
    1. Post text instructions on how to setup your car or part. No need to post an entire car configuration necessarily if you are only changing a certain few parameters; post what has been changed.
    2. Post screenshot(s) of the tuning menu changes.
    3. Not sure if it can be done here, or if it should be done but you could post a configuration file. If there are concerns over that being included in a general discussion thread, mods please remove #3
    4. Assist someone with their tuning setups
    *****Try to use spoiler tags for longer entries, as some methods such as text could take up lots of page space. Screenshots are probably the easiest though a combination of methods #1 and #2 could work as well.

    **This is not a replacement for any configurations page thread, irregardless if how to make a configuration is posted here; this thread is about better tuning, and since the cars in BeamNG are in some ways different than real life cars, they have certain properties that makes them unique to tune.

    NOTE: a good way to get started in tuning is researching online on how cars suspensions, etc are tuned in real life, as BeamNG's inherent physical properties reflect those of real cars; what works for real cars should in theory work in BeamNG.

    , made to show what might work for the suspension on the car.
    The idea here is to post suspension, all other parts such as cosmetic parts should be ignored, engine parts can be posted however

    I will use screenshot method, since its the easiest for larger setups
    20160504195636_1.jpg 20160504195641_1.jpg
    Engine has a stage three turbo set to all maximum values, as well as an oil cooler and better radiator.
    Suspension is adjustable race front and rear with adjustable sway bars and adjustable front/rear differentials.

    Feel free to comment on your setup, such as its purpose, usage, good/bad etc.
    : This setup is fun for very tight tracks such as the small road on jungle rock island that starts on either side of the main road's tunnel. The car itself is designed to heavily over-steer when throttle is lifted off and "understeer" forward when applied, allowing for easy rotation around tight corners and a "point and shoot" method of driving . Not an easy car to drive currently but very fun when you get it right.

    RE: (above post) Good setup but weird to drive, I have found its much easier if the differential is given more preference to the rear, about 60% rear and 40% front. Making the rear sway bars softer and the front stiffer lowers overall limits but makes the car much easier to drive for non constant hairpin roads. More camber in the rear makes it feel much more stable too
     
    #1 derpfleet55, May 5, 2016
    Last edited: May 5, 2016
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  2. Narwhal

    Narwhal
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    i like this idea. heres my setup for offroad solid front axle that goes in a straight line
    screenshot_00736.png
     
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  3. CarBro74

    CarBro74
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    For a good tip I just lower it. It doesn't make that much of a difference, but it is still fun. Only on my Super Ibishu, I left some ground clearance, but you do what you want. The only way for it to make a difference is to lower it a ton. Only, if you do it all the way, your car would obviously brake its suspension and pull a direction and crash if there is something to crash into.

    This is my tip. Here is a picture of my tuned car:
    image.png
    Not a good photo for looking at suspension, but it is still a good tune build.
     
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  4. derpfleet55

    derpfleet55
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    FUN tip time for everyone's benefit. Toe is often overlooked but it is super important for a good handling car. Often rear wheel drive cars require toe towards the center of the car in the rear (this is positive percentage in the current tuning menu) and toe inwards at the front as well (also positive percentage in the tuning menu). AWD and FWD cars benefit from outwards facing front and rear toe, to counter their under-steer (both negative in tuning menu).
    Toe works like this:
    • Front toe, useful for the first 1/3 of the turn; outwards toe helps turn in but makes the car more sensitive and often "twitchy" if too much is applied. Inwards toe causes under-steer but increases stability.
    • Rear toe is much the same as front toe, but useful for the later 2/3 of a turn, inwards toe helps stability in putting power down in a rear wheel drive car by causing power to be sent towards the center of the car. Outwards toe sends the rear outwards, good for a drift car or a front or all wheel drive car to counter their under-steer.
    Here is a setup I use for the Sbr4 TTS2
    20160504212853_1.jpg
    Note the toe usage front and rear

    This setup uses a bit more camber at the front and rear, as well as lots more negitive toe in the rear and a bit in the front to heavily reduce understeer, while still keeping the car stable. works best under consistant throttle
     
    #4 derpfleet55, May 5, 2016
    Last edited: May 5, 2016
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  5. Goosah

    Goosah
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    Yay, a handling/suspension thread!

    In the default setups I tend to keep the rear toe positive (pointing inwards) even on fwd/awd cars, so that the cars can handle the more violent inputs of kb and gamepads. So I suggest that, except for the Bolide and rwd SBR4 perhaps, a wheel user (or a careful gamepad user) could happily run less rear toe.

    I also generally tune the rear wheel drive suspensions to add some toe in under compression. This way, when the weight transfers rearward under power, toe increases a bit. This has a big stabilizing effect, but if I do it too much, the car can be unstable when lifting/braking. It also makes the car oversteer a bit more abruptly with too much throttle.
     
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  6. derpfleet55

    derpfleet55
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    Yes toe inward makes lots of sense in that many people use keyboard controls. A wheel certainly allows much more freedom in terms of suspension setups, simply since small adjustments are easier, and therefore making a suspension that only requires small turning input for lots of turning is useful. If I may ask, how do you set up the suspension to give toe under compression? I have been attempting to do that by using the nodegrabber but so far results have remained inconclusive. I understand the basics of suspension tuning but i'll admit all the softness fast/slow compression ratios confuse me at times.

    I certainly agree with more inwards toe on the Boilde, heck I often add more since I have a bit of a lead foot when it comes to throttle control.
     
    #6 derpfleet55, May 5, 2016
    Last edited: May 5, 2016
  7. Deleted member 126452

    Deleted member 126452
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    Wouldn't that theoretically be practical for real life cars either or would the snap-oversteer be a bigger problem?
     
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  8. derpfleet55

    derpfleet55
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    I think for econobox cars its not a huge deal, however some cars use a system to add rear toe to help with cornering, specifically in sports cars. Essentially 4WS systems took this to a larger degree, allowing for less under-steer. Some companies like Porsche have even used passive rear steering systems on rwd cars to accomplish the same task, which is actually helpful on 911's to reduce under-steer and also reduce snap over-steer. This is because originally the old 911 platform would under-steer initially, causing the driver to need to lift off, brake or turn in sharper which would then induce some over-steer. If the initial under-steer is removed then the car was able to be driven smoother, and snap over-steer scenarios were less likely to happen. Though toe is a bit different than passive rear steering the idealized outcome is similar, plus generally the amount of toe added wont cause snap over-steer itself, though it certainly might make it a slight bit easier if you are not driving smoothly. I post way to much here...
     
  9. Deleted member 126452

    Deleted member 126452
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    Always wondered why the 911 has AWS as an option in the first place, thanks.
     
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  10. Goosah

    Goosah
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    It's done by changing the angles of the links in jbeam. The nodegrabber would be a very difficult way to do it haha. Sometimes only a few mm is enough to create the desired (probably at most 0.5 deg) change in toe through the travel range so it can be tricky. You can see the importance of the alignment readout feature ;)

    Here's the 200BX rear suspension for example. The toe link is the most rearward link, and the main link that determines the toe angle of the wheel throughout the travel. If I move node rh6r/l up and down just a few mm, I can change the toe curve.

    toelink.jpg
     
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  11. Goosah

    Goosah
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    I think the goal of a passive system (which means that it is adding intentional "compliance-steer" by using flexible components or bushings) is to get around the problems created by putting too much toe change in the suspension. With "hard" toe change, the rear suspension will toe out when braking or lifting. But the problem with the passive idea is that it can be unpredictable, because in a way, it's like a feedback loop. The toe is set by the lateral force on the suspension, which changes the toe, which changes the lateral force... If the conditions are wrong this can be unstable. A lot of racers end up removing the passive steering effect with solid bushings, and trading off the less "ideal" suspension with one that is just more predictable.
     
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  12. derpfleet55

    derpfleet55
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    Polyurethane bushings are great, Also helps for the track in that they are more durable than rubber ones. Good point about removing the "ideal" suspension, since even on a track things can get unpredictable; A lot of people who track day cars with active steering systems also remove them too, since they do have a tendancy to create unwanted over/under-steer.

    Here is a good setup I like to use for the RWD ETK 856 ttsport, though it does need some fine tuning still (Had a better setup but did not save it).
    20160505143953_1.jpg 20160505143941_1.jpg dem rims
    Car is otherwise stock, other than the suspension adjustments. Works really well on the "green hell" nordschleife track with a wheel.
     
    #12 derpfleet55, May 5, 2016
    Last edited: May 5, 2016
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  13. derpfleet55

    derpfleet55
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    Bump time, here is a config I have found works very well for endurance racing, using the ETK 3000i as a basis.

    Pretty photos
    screenshot_00129.png screenshot_00130.png screenshot_00131.png

    Photo's of parts and suspension configs (click on them to enlarge)
    parts
    Capture.jpg Capture2.jpg Capture3.jpg
    suspension
    Capture4.jpg Capture5.jpg Capture6.jpg

    Car is very well planted, but still rotatable in the corners, great for endurance racing many laps around a racetrack of your choice. Note that this setup uses a stock 3.0l engine but should work well with higher power levels as well. Enjoy!

    *Most of the suspension settings are the stock suspension settings for the race suspension, only camber and toe was adjusted.
    **You may have to change the brake pads from premium to full race if you want to use race brakes.
     
  14. CannedPakes

    CannedPakes
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    Nice, thanks. Why does the solid front axle pull to the side in the first place?
     
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