When pulling the steering wheel at low speed, is it troublesome that the tires of Porsche sound gorgorge?

Boxster GTS tires
Travel information about Porsche

"Gorigori" sound of the tire

When I cut the steering wheel at low speed on a cold weather day on the winter, the tires will sound "gorigori" "bolivoli"Sometimes.(For example, when going out from the parking lot to the left or right)There seems to be owner who inquires dealer, "Is this a problem?",In conclusion, this is not a problem.

My husband explained the reason for that the other day, but as I can not understand much like the example ... "Because I am not good at physics, I do not understand such theory (- _ -)", " This is not a physical problem but general common sense or w "and a lecture using a radio control began (* _ *)

Cause of tire "gorgorgi" sound

Porsche on the steering mechanism"Adopt Parallel steering geometry, not Ackermann steering geometry"are doing.

Ackermann steering geometry is what is commonly adopted in passenger cars. When traveling at ultra-low speed, when turning the handle large and trying to bend, the turning radius through which the left and right tires pass is different,When the front tire's right and left break angle are the same, it becomes difficult to bend.In order to prevent it, it is the Ackermann steering geometry that the setting of the front tire's breaking angle is set differently.

However, if you adopt Ackermann steering geometry,When turning the steering wheel during middle to high speed driving, it becomes impossible to make a smooth turn using the characteristics of the centrifugal force.For example, when turning to the right corner, the load to the left tire increases due to the centrifugal force and the load to the right tire decreases. By reducing the load on the inner tire, the turning performance improves more smoothly and it can be bent smoothly, but if you adopt Ackermann steering geometry, its characteristics will be lost.

thereSports cars and racing cars dare not adopt Ackerman steering geometry.Parallel steering geometry(Steering link mechanism in which the inside and outside turning angles of the front tire are set approximately equally in parallel)It is designed to be able to turn more smoothly when traveling at medium and high speeds.

Therefore, if you turn the steering wheel at a very low speed and turn it, the front wheel slips because the inside and outside angle of the front tire is almost the same"Gori Gori" "Boliv"An unusual noise is generated.

Also, because Porsche tires are made of high performance and heat resistant (Meaning of "N (number)" of Porsche certified tire and behind the scenes of approved tire development)Conversely, when the temperature in winter is low, it sounds like that due to the friction between a hardly cold tire block and asphalt.

In other words, this sound"Proof that Porsche is a sports car" "Proof that it is a high-performance tire"It is.

Proof that it is a Porsche

When I guess the reason why Porsche adopt parallel steering geometry,

① Enable to turn smoothly when turning the curve at medium and high speed
② The responsiveness improves when the steering wheel is turned off while driving
③ To suppress extra load and heat to the inner tire by circuit etc.

Is not that what it is. Her husband, when he noticed such a thing, wrote it on paper and explained it.(The characters are too dirty to read w)

While I was driving, I occasionally heard this "gorigori""Because my driving is bad, I hear a burden on the tires and this sounds like that."I thought. But I learned that it was not so, I was a little relieved (lol)

By the way,

"This gorigori, the sound of bolivar, is the proof of PorscheWhat If you don't like this sound, you'll get a Porsche. You should take a duck or a general passenger car! Rather, please boast about this sound! "

I was saying w

No, he's really deep inside.

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  1. Wind slope

    Since I was the first Porsche to start from winter, when I first experienced it, it was "suddenly faulty! "I feel embarrassed memories that rushed to the dealer and gave me the same explanation!

    • MinaMina

      Mr. Sakamichi of the wind
      Thank you for your comment!

      > Since I was the first Porsche to start from winter, when I first experienced it, it was "suddenly faulty! "I feel embarrassed memories that rushed to the dealer and gave me the same explanation!
      That's right (laugh)! But, it is a problem ...! I think for a moment. I was convinced that "there is such a noise from the tire as my driving is too bad," I could not even say that until recently (lol)

  2. Ruun Rumba

    Nice to meet you! I always see blogs happily.

    I live in Kyushu who suddenly developed Porsche disease (lol) two years ago. Air cooling 964 → Cayman GT 4 → 718 Boxster GTS → 991 GTS There is no utility and no delivery wait
    Although it is a car itinerary, but air-cooling 964 is satisfactory if it moves, so I do not mind the trouble (suitable) GT 4 and Boxster sound loudly together (lol)
    Incidentally, Alfa Romeo's Julia Quadrifoli was similar too. Is it a medal of a sports car?
                              
    I am looking forward to the fun Porsche article from now on!

    • MinaMina

      Ruun Rumba

      It is a nice pen name ^ ^! Thank you for your comment again!

      > I live in Kyushu who suddenly developed Porsche disease (lol) two years ago. Air cooling 964 → Cayman GT 4 → 718 Boxster GTS → 991 GTS There is no utility and no delivery wait
      > Although it is a car itinerary, I do not mind a problem because air-cooled 964 is satisfactory as it moves (suitable)

      Oh - oh, it's just a wonderful car transferring ...! And 991 GTS delivery wait is ... amazing! ! !
      Although it may be unlikely practical indeed, (laugh) From a sports car lover, it is a funny lineup that drool will come out!

      Julia of Alfa Romeo is also so! My husband suddenly said "Julia is cool! I want to get on!" ^ ^

      Thank you very much for your continued support from now on!

  3. Kasamachikara

    Excuse me,

    I also experienced at 981.
    Especially when I left from temporary stop on T-junction and turned left, I was getting fuzzy.
    I thought whether the tire was hard in winter and that the mountain decreased with traveling 12000 km in 3 years is also relevant
    I switched to Michelin Pilot Sports 4 from Pirelli P Zero and it got level that does not matter even if it passes the same place (it is the exit of the house).
    For nearly two years after that, the mileage has reached 22000 Km, but at the moment there are no bad sounds and vibrations.
    I think that it was the influence of the hardness of the tire and escape by the remaining mountain in my 981 case.

    • MinaMina

      Ms. Kasamachikara
      Thank you! It is getting pretty cold already and I think that the tire has become the season of "Gagaga" ~ Today these days (lol)

      > I also experienced at 981. Especially when I left from temporary stop on T-junction and turned left, I was getting fuzzy.
      > When switching from Pirelli P Zero to Michelin Pilot Sports 4, it is a level that does not bother me through the same place (it is the exit of the house).
      That's right! I do not care whether it will gradually become unconscious when riding a buggagger, but it depends on the tire so much ...!

      I would be happy if you could tell me again.
      Continue to thank you!

  4. euukie

    I will comment for the first time.
    As I am a Porsche beginner, I am happy to see any article.
    I was riding on the Mankan and I thought it was completely wrong before I read this article.
    When I was parked in the office every morning, I was scared to say that it was a problem and I couldn't go to the dealer, although I was hearing the resistance felt by the sound and steering. (Lol)

    As there are no Porsche owners around me, I am really looking forward to the update.
    We look forward to the fun content from now on!

    • MinaMina

      euukie
      Thank you for always seeing the blog!
      And thank you for your comment ^ ^

      > I was riding on a kan, and I thought it was completely wrong before I read this article.
      It sounds quite loud, and I think it's completely a fault ... ^ ^;
      It is full of things I do not know yet, and Porsche's common sense and the common sense of a general car are completely different.

      I will continue to enjoy myself and update my blog from now on,
      Continue to thank you!