diameter of the circles for drift

Thread in 'Technical Questions' started by bastards-of-street, Sep 29, 2019.

  1. bastards-of-street

    bastards-of-street New Member

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    hello guys, I'm Italian, I'm preparing my nissan s13, I want to do a stage 2. 260-280cv. I'm undecided, tomorrow I have to buy the rims, 17x8 tyre 205/45 17, or 18x8.5 tyre 225/40 18? i love the 18, do you feel the difference between 17 and 18? the car struggles a lot with the 18? or should I not have problems with that power?

    Simone
     
    #1 bastards-of-street, Sep 29, 2019
  2. BenRice

    BenRice Well-Known Member

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    What is you final drive / diff ratio?

    The car will feel more responsive on a 205/45/17 tyre due to the smaller rolling diameter than the 225/40/18. You will definitely notice it.

    However you can make those 18" tyres feel like the 17" tyres by going for a shorter diff ratio. Assuming you're running a 3.9:1, if you were to run a 4.36:1 diff ratio the 18" tyres will feel more responsive and like how the 17" tyres feel with a 3.9:1 diff ratio.
     
    #2 BenRice, Sep 29, 2019
  3. bastards-of-street

    bastards-of-street New Member

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    I don't know what relationship I have, can I check, if I block the differential 100%?
     
    #3 bastards-of-street, Sep 29, 2019
  4. BenRice

    BenRice Well-Known Member

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    Block it????

    You can either remove the diff from the car and take off the rear cover and look on the crown wheel for the numbered ratio (list of number markings are here: http://www.eatsleepboost.lt/tech-info/nissan-tech-info/nissan-r200-diff-ratios/)

    Or you can raise the car off the ground, go under the car near the front of the diff, mark a bolt on the driveshaft input flange on the diff and count how many times the driveshaft spins around completely while another person spins the wheel 360 degrees.

    If the driveshaft rotates about 3 and a half times a 3.692 ratio
    If the driveshaft rotates slightly less than 4 times it's a 3.916 ratio
    If the driveshaft rotates slightly more than 4 times it's either a 4.083 or 4.111 ratio (negligible difference between the two)
    If the driveshaft rotates about 4 and a third times it's a 4.363 ratio
     
    #4 BenRice, Sep 29, 2019
  5. bastards-of-street

    bastards-of-street New Member

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    yes friend, weld it, 100% blocked, I know that what I have is a self-locking, I will do this test as you say
     
    #5 bastards-of-street, Sep 29, 2019
  6. bastards-of-street

    bastards-of-street New Member

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    however, I attach the weight of circles 17 and 18

    Screenshot_2019-09-30-10-23-02-049_com.facebook.orca.
     
    #6 bastards-of-street, Sep 30, 2019
  7. r3k1355

    r3k1355 Well-Known Member

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    Tyres will be expensive drifting on those rims, have you taken that into account?
     
    #7 r3k1355, Sep 30, 2019
  8. bastards-of-street

    bastards-of-street New Member

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    the tires to make drift, give them to me, or, I buy them used, so they cost little, I'm interested only to know if the car with 18 "rims, strains, or I can feel comfortable with that power
     
    #8 bastards-of-street, Sep 30, 2019
  9. bastards-of-street

    bastards-of-street New Member

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    I could also mount 215 40 18
     
    #9 bastards-of-street, Sep 30, 2019
  10. tomsheen

    tomsheen Active Member

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    You will be able to drift on 18” wheels no problem
     
    #10 tomsheen, Sep 30, 2019
  11. bastards-of-street

    bastards-of-street New Member

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    therefore, I buy wheels with 18x8.5j weight 10.5kg, tyre 215/40 18, more, I buy the lightened flywheel, to mask the loss of power

    280cv
    Wheels 10.5 kg + tyre 11kg
     
    #11 bastards-of-street, Sep 30, 2019
  12. BenRice

    BenRice Well-Known Member

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    Don't worry about the lightened flywheel. Weight of the wheel at these power levels is not important

    215/40/18 is a better size for the 18's too. Compare your rolling diameter using: https://www.willtheyfit.com
     
    #12 BenRice, Sep 30, 2019
  13. tomsheen

    tomsheen Active Member

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    Your thinking too much.. Just put whatever wheels look cool on and go drive the car.
     
    #13 tomsheen, Sep 30, 2019
    • Winner Winner x 1
  14. bastards-of-street

    bastards-of-street New Member

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    Hello guys!! I ordered the rota grid wheels 18x8.5j offset 30,tyre 215 / 40-18. what do you think?
     
    #14 bastards-of-street, Oct 5, 2019
  15. BenRice

    BenRice Well-Known Member

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    They'll do the job
     
    #15 BenRice, Oct 6, 2019
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