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Ibishu Pessima

Discussion in 'Official Content' started by gabester, Nov 13, 2012.

  1. Shotgun Chuck

    Shotgun Chuck
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    I have managed to salvage it somewhat with suspension tuning, then added more power just to see if I could bring its performance a little closer to some of the other Street Tuned cars.

    PARTS EXCHANGED:

    Engine Management: Stock ECU >>> Adjustable Race ECU
    Engine Long Block: Stock Long Block >>> Heavy Duty Long Block (stock one overtorques with even the lowest fixed N2O shot)
    Nitrous Oxide System: Empty >>> Nitrous Oxide Injection

    SETTINGS CHANGED:

    Engine/RPM Limit Cut Time: 0.13 s >>> 0.01 s
    Engine/RPM Limit: 6000 RPM >>> 7000 RPM (If you forgo the nitrous and upgraded long block, set this to 6600 as the stock one overrevs in that range; 6700 seems safe with a longer cut time but even 6650 can cause trouble with a shorter limiter, however 6600 isn't really enough overrun as the engine's horsepower peak is at 6400, so I set it to 7000 with the upgraded long block)

    Suspension/Front/Bump Damping: 7000 N/m/s >>> 6000 N/m/s
    Suspension/Front/Rebound Damping: 15000 N/m/s >>> 13000 N/m/s
    Suspension/Front/Spring Rate: 71000 N/m >>> 50000 N/m

    Suspension/Rear/Bump Damping: 5000 N/m/s >>> 4500 N/m/s
    Suspension/Rear/Rebound Damping: 10000 N/m/s >>> 9500 N/m/s
    Suspension/Rear/Spring Rate: 51000 N/m >>> 41000 N/m

    Wheel Alignment/Front/Camber Adjust: 0% >>> -5%
    Wheel Alignment/Front/Toe Adjust: -20% >>> -35%

    It's much better than before, but the front end still likes to bounce off the ground when landing from Utah's crests. This seems to be a problem with the stock one too. Going any softer on the front than I did may have actually made it worse, and may have also caused more on-power push. Lack of grip doesn't seem as much of a problem in Utah as it did on the C1 Loop mod, however it does still seem to manifest from time to time. How would I fix the front to make it stick landings better?
     
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  2. gdfastner

    gdfastner
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    More front end damping would make the front land smoother I think, but I haven't done any tuning in a long while so I wouldn't know.
     
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  3. Shotgun Chuck

    Shotgun Chuck
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    Maybe I'll try it after I get back from Dillingham tomorrow night, thanks.
     
  4. fufsgfen

    fufsgfen
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    It might be that bump stop has not enough damping, or then it can be related to ARB setup, not sure which, but some cars still tend to bounce bit like pogo-stick even ARB behavior was greatly improved with Torsion ARB setups quite recently.

    I have thought it is bump stops, but might of been way ARB was working.

    For race variant I have made this setup, which does not get quite so much air time, not sure if you can get much improvement to street tuned variant by examining it, but might be worth to test with such damping:
    https://www.beamng.com/threads/beamng-nordschleife-lap-times-competiton.61112/#post-1004952
     
  5. korbitr

    korbitr
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    135
    Didn't the LCD display on the stereo system used to show that the car was playing Candle in the Wind by Elton John? Did that get removed or something? The stereo in the 200BX is still playing Sandstorm by Darude...
     
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  6. ManfredE3

    ManfredE3
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    Was it the other Pessima?
     
  7. MrAnnoyingDude

    MrAnnoyingDude
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    No.
     
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  8. rottenfitzy

    rottenfitzy
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    Reverb Pulseblaster 40-C.

    On a factory stereo.

    I’ll just leave that there.
     
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    • Informative Informative x 1
  9. Ytrewq

    Ytrewq
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    Mine is fine
    screenshot_2019-05-02_00-43-58.jpg
    --- Post updated ---
    It's ReverS.
     
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  10. default0.0player

    default0.0player
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    Nov 30, 2018
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    I found a problem
    The Street Tuned has 17X8 front wheel and 17X9 rear wheels, which leads to understeer at any speed
     
  11. Copunit12

    Copunit12
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    Jan 13, 2015
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    That not a problem that's a feature.
     
  12. gdfastner

    gdfastner
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    Most, if not all, FWD cars have wider rear tires than front.
    Wider front tires gives you lethal snap oversteer.
     
  13. Harkin Labs Gaming

    Harkin Labs Gaming
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    That isn't correct unfortunately. Most FWD cars have a squared setup where the front and rear wheels are the same width to make it have the most balanced handling and the ability to rotate tires. The only time I can think of a FWD car having different tire widths is on a drag racing car, but those are purpose built for driving in straight lines.
     
  14. gdfastner

    gdfastner
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    Ah alright. Completely gloss over damn near all FWD american car from the eighties but do continue.
    Anyways, a car having wider fronts than rears is a recipe for disaster.
     
  15. default0.0player

    default0.0player
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    Most, if not all, RWD cars have wider rear tires than front.
    FWD cars have same rear tires as front.

    Other Pessima(2nd gen) than Street tuned use the same front and rear tires
     
  16. Harkin Labs Gaming

    Harkin Labs Gaming
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    After doing about 5 minutes of research, I can find only 1 oem car that had a staggered tire setup on a FWD car. It seems that it was a feature on one of Pontiac's performance models. My project car is a 1989 Buick Reatta and it has 225s all around. I can't seem to find any other mentions of FWD cars leaving the factory with staggered tire setups.
     
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  17. FLyInG 2 YoUr SoUL

    FLyInG 2 YoUr SoUL
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    What?

    Most sporty RWD cars do.

    FWD? It's a common practice to rotate front and rear tires around to even out wear and increase their usable life. Just sayin'...
     
    • Agree Agree x 6
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