RFactor 2 Advanced Car Set up Guide

Discussion in 'General Discussion' started by davidporeilly, Sep 13, 2015.

  1. tommy737

    tommy737 Registered

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    Hi All/David

    First of all please let me thank you for your guide, as I'm a complete newbie of this world, the guide was exactly what I needed to undestand the principles of car setup.

    Don't know if this comes against the rules of the community, but I'll try to post amessage coming from a different internet site as I'm honestly getting confusing regarding diff lock setting so I really hope somebody else could help me to understand my doubts....


    Other site statement
    Power-diff: High values=over-steer behaviour, Low values=under-steer behaviour.
    Coast-diff: High values=Under-steer behaviour, Low values=Over-steer behaviour.

    To complete this:


    Well, as a poor driver, I'm trying to chase the truth by myself making test and different run (SPA, using Formula Renault 3.5 as it comes on the sim). Closing the diff power (100%) car does not oversteer so quickly but tyre wear highly increases and this should confirm what David explains on the guide, but my question is...

    how is that possible such a video on youtube explaining exactly the opposite? Any possibilities the other sim uses opposite scale? I do believe lock means lock (100%) so an increase on diff power should bring the car towards Understeer, and not oversteer as stated just above.

    I have been also checking at the beginning of this topic some topic related to this, so do we have (as a magic number of setup does not exist) which is the right direction on setting up a car with diff?

    Hope it makes sense
    Cheers
    T
     
  2. davidporeilly

    davidporeilly Registered

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    @tommy737
    In my view the other site statement
    "Other site statement
    Power-diff: High values=over-steer behaviour, Low values=under-steer behaviour.
    Coast-diff: High values=Under-steer behaviour, Low values=Over-steer behaviour."

    Is a bit confusing, do they mean to deal with oversteer behaviour or to create oversteer behaviour?
    They also maintain that more diff lock or less diff lock does the opposite thing on power vs coast.


    My view is explained completely in the guide but to "ad lib" some reply here.
    Increasing diff lock makes the car go straighter in corners, as the freedom of the wheels to rotate at different speeds is reduced and that freedom is what lets the car turn more. There are some very good video links in the guide explaining this by starting at the fundamental function of a diff.
    Making the car go straighter is reducing oversteer. So increasing diff lock reduces oversteer.
    On power side it does it on throttle (mid corner and corner exit on throttle).
    On coast side it does it off throttle (so under brakes).
    Pre-load does it all the time.

    If you ever saw a car in the days before limited slip diffs were available (another name for a diff that locks a bit) you would see the loaded outside wheel gripping and the unloaded inside wheel spinning. This created oversteer.

    That video is a bit long and slow moving for me to watch 18 mins on that one topic-sorry. But I smiled as I raced Snetterton IRL 2 weeks ago and that's where the opening sequences were.

    As a rule of thumb you need to set diff lock as low as possible to reduce front wear. More lock means the fronts are fighting the diff as they try to turn the car.
    So first get the chassis balance right (springs-dampers) for mid corner. Then play with diff in the transitional parts (entry -Coast and exit-Power). Start with none. Only add to solve oversteer that is occurring.
     
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  3. Phoentje

    Phoentje Registered

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    Hi David. Send you a request trough PayPal. Forgot to mention my email address. Did ya receive it?
     
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  4. davidporeilly

    davidporeilly Registered

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    Yes I think it's sent now (Monday).
    I was away from Friday at Donnington.
     
  5. Dady Cairo

    Dady Cairo Registered

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    The printed version is only English i think?
    What's the price to Germany with Porto and Package?
    Cheers
    Chris
     
    Last edited: Aug 24, 2019
  6. graphicaluserinterface

    graphicaluserinterface Registered

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    As posted here, and a great summary of setup guides, you can have a look at this:
    image0.png
     
  7. Dady Cairo

    Dady Cairo Registered

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    Thank you looks really helpful. I think I must print this....
    DC
     
  8. davidporeilly

    davidporeilly Registered

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    Fellow Sim racers.
    Follwing a summer of real life racing where I put these theories to the test at Donnington Park GP, Anglesy, Oulton Park, Snetterton and Silverstone International, The Sim racers Performance Guide has had a small freshen up.
    There is an added paragraph on ride height which I will insert here for the convenience of customers.
    Aside from that it has had some grammar tidy ups (e.g. and i.e. vs EG or IE) a new logo added to the cover and a tiny update on the author.
    I let my creative forces run free with the logo/shield. I hope you like it. It represents What we measure, what we control and underneath the changes we can make and where they contact the road!! :)
    If you have the guide already you are welcome to the update at no cost but if convenient you can just make a note of the ride height details below.
    Page 17 "Chassis adjustment-Ride height"
    "Also changing the ride height at one end will move grip around e.g. if you raise one end it will add grip to the other and vice versa. This can be very handy if other suspension adjustments are limited. On cars without aero this is simple. If cars have underbody aero it gets more complicated."
    SimRacers Guide Cover with shieldV3_flattened.jpg
     
    Last edited: Nov 22, 2019
  9. davidporeilly

    davidporeilly Registered

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    Here is some more blurb updated from last years refresh.

    The guide will now run to about 74 pages and include driver skills and strategy.
    There a lot of video links to help you, (prob 20 hours or so but who's counting) to illustrate points and to take away the boredom of just reading my ramblings. Some are bespoke, some existing ones.
    The forum link below takes you to two of the videos we have created to support the guide.

    Pricing; The thorny issue of pricing must be addressed.
    • Firstly the old version is still available for sale and is still €5.
    • The New Guide will be launched @ €10 (or £8).
    • If you bought the old one you can get the updated one by simply paying the difference of €5.
    • If you were one of the amazing people who just out of the kindness of your heart paid me €25 or €30 for your copy of the original guide or paid for multiple copies for your team (instead of pirating) you get yours for free.
    • If you are a modder in this community who has created free of charge assets that we can all enjoy; be they cars, tracks or plugins then you get yours for free as well.
    • For everybody else, the investment in your knowledge and development is €10. (cheaper than 3 issues of motorsport or about the price of 2 coffees).
    Please can we avoid the massive debates about "everything should be free, it's a ripoff" etc. :) (If you want the entertainment it all happened 2 years ago earlier in this thread). If you deserve a free one (see list above) you get a free one. If not then we welcome and appreciate your patronage @€10 or alternately respect your consumer right to walk away.

    To order you simply send the purchase price to my paypal
    davidporeilly@hotmail.com
    Ensure your email is quoted correctly.
    If you are one of the generous people listed above then just let me know the story or send me a receipt.

    Merry Xmas to all sim racers.
    David
     
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