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  1. #631
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    Quote Originally Posted by tbtstt View Post
    Found and signed up to this forum as a consequence of your blog Antony. Please keep the posts coming, some absolutely fascintating reading on your blog!
    Thanks! you made my day !!
    http://wrcbehindthestages.blogspot.com

  2. #632
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    Did a little piece of comparison between Tänak and Ogier on my blog

    http://wrcbehindthestages.blogspot.f...-vs-tanak.html

    Cheers,
    http://wrcbehindthestages.blogspot.com

  3. Likes: EstWRC (6th May 2015),OldF (7th May 2015)
  4. #633
    Senior Member EstWRC's Avatar
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    Thanks a lot. Actually Tänak didnt have a real go at this powerstage, he said he tried to add some more pace but that was it. But yeah I also noticed on sweden onboards that Tänak loses a lot in the twisty slow sections compared to Ogier and on the fast parts he doesnt lose time or is even faster than Ogier. And i agree that it is down to confidence and experience, which Tänak hasnt got a lot at the moment because of the recent incidents. We will see what he can do with the new upgraded Fiesta, he has said that it will suit him more.

  5. Likes: Antony Warmbold (6th May 2015)
  6. #634
    Objective observer stefanvv's Avatar
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    It is a rare privilege to watch such fast driving on such a rough and technical stage. Ogier literally "ran over" it. In such cases one can see the real difference why some drivers have more "luck" avoiding troubles than others.
    "With that car, your brain can actually never keep up"
    https://www.youtube.com/watch?v=_4IRMYuE1hI

  7. Likes: A FONDO (7th May 2015)
  8. #635
    Senior Member OldF's Avatar
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    I tried the calculator with the Polo RX values (http://www.volkswagen-motorsport.com...php?id=823&L=1), 0-100 km/h = 2,1s and 1300 kg. Got an odd result, 825 PS.
    “Don’t eat the yellow snow” Frank Zappa

  9. #636
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    Quote Originally Posted by OldF View Post
    I tried the calculator with the Polo RX values (http://www.volkswagen-motorsport.com...php?id=823&L=1), 0-100 km/h = 2,1s and 1300 kg. Got an odd result, 825 PS.
    well 850N of torque is huge so hell...why not !!!
    http://wrcbehindthestages.blogspot.com

  10. #637
    Junior Member Jack#07's Avatar
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    Hello Antony,
    I read all your topic and it is absolutely fantastic.
    Not sure if you still provide support to rally fans but I want to try to ask you a question about something that really confuse me and it seems that no one actually knows.
    The hot question is about steering lock ratios of modern wrc cars and its applications on driving and on setups.
    Fiesta/focus wrc specs on M-sport site says: "Steering: Power-assisted high-ratio (12:1) rack and pinion. One and a half turns lock to lock."
    From onboard cams I noticed that most of the wrc cars actually have 540° of steering wheel rotation but some seems to have only about 360° or little more (It's not easy to retreive it from onboards) So, Is it adjustable? The other part of the question is about rotation angle of wheels. 12:1 ratio means that the wheels can be phisically turned a total of 45° from lock to lock.
    I tend to think that it is a low value for a car that is frequently sideways, most of street derived cars have about 60° of wheels rotation and I think that an high value (even if not always used during driving) can help you to recover the car in the case of sudden loss of grip or if you exceed on slip angles... Is even this adjustable on WRC cars?
    I would like to ask you if you can confirm the m-sport values and (if they are actually adjustable) what steering/wheels lock values were you running on different rallies or surfaces conditions.
    Thank you

  11. Likes: A FONDO (20th May 2017)
  12. #638
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    Hiya Jack, 360° on a wrc car - I have never seen. But one and half turn sounds right for all the cars I've driven. I have never heard a driver or a tech speaking of or wanting to change the ratio or adjusting it - but anything is possible to do if you really need to. My feeling is if someone would make the steering more direct it would make the car more difficult to drive. I am unable to answer about the rotation angle of the wheels, sorry. But I can say that whatever angle they turn to, it always felt like plenty. A proper gravel driver will use speed, throttle and brake to make the car turn with as little big steering inputs as possible; maximum traction is attained with the front wheels straight. If you see a good driver coming around a corner with full opposite lock it's probably because he accidentally put the rear wheels in the loose and lost the rear. Hope this helps a bit with your questions!
    http://wrcbehindthestages.blogspot.com

  13. Likes: janvanvurpa (22nd June 2017),skarderud (21st May 2017)
  14. #639
    Senior Member Mirek's Avatar
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    Dear Jack, the reason why WRC cars have low steering rotation (i.e. very large turning radius) is IMO in driveshaft joints limitation. When front wheels are powered, especially with huge torque You need to keep the angle rather low, otherwise driveshaft brakes. I give an example from cheap rally car with stock steering - You can take commom old Honda Civic VTi with 170 Hp 1.6 engine with very low torque. The stock steering allows so high angle of the driveshaft joint that with LSD it is very easy to break the driveshaft just by pushing full throtle on first gear in full turn.

    That's also why You can see very high steering angles possible with RWD cars - there are no driveshafts in front. Simple as that.

    Anyway the turning radius limitation is more of an issue on asphalt than on gravel. It means some corners You need to take with handbrake because otherwise You have to reverse.

    PS The driveshaft joint extreme angles are kind of limitation also for suspension travel. With McPherson struts the more travel the higher angle of the driveshaft joints.
    Last edited by Mirek; 21st May 2017 at 11:02.
    Stupid is as stupid does. Forrest Gump

  15. Likes: janvanvurpa (22nd June 2017)
  16. #640
    Junior Member Jack#07's Avatar
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    Thank you for your replies, maybe I tought that it was more important than it actually is!
    Hiya Jack, 360° on a wrc car - I have never seen. But one and half turn sounds right for all the cars I've driven.
    I supposed 360° after watching this clip of Mekee from 2017 Sweden https://www.youtube.com/watch?v=C2-eRLOu26E when he turn the wheel exacly 360 degrees recovering the car from a snow bank, but maybe it is just a coincidence, I'm sure that during mexico rally he was using 450 degrees (saw him crearly at lock position during his "car park tour" on the last stage).
    Dear Jack, the reason why WRC cars have low steering rotation (i.e. very large turning radius) is IMO in driveshaft joints limitation.
    Very interesting theory, I read a similar supposition here https://forums.nasioc.com/forums/sho...d.php?t=707665
    but the only solution seems to be contacting Prodrive

    I also read an interesting article about braking from redbull site https://www.redbull.com/gb-en/jari-m...art-of-braking
    I think that the section "The Loeb effect" could be an interesting topic about how he changed the driving and braking techniques

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