Can U make up the diffrence of 4:27 to 3:73 w/ tires

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  • wastedincome
    E30 Modder
    • Aug 2004
    • 906

    #1

    Can U make up the diffrence of 4:27 to 3:73 w/ tires

    Ok I'm wondering if I changed my 4:27 diff. w/ a 3:73 could I make up the diffrence of the Final ratio w/ a lower profile tire??? I know its a big change but figured it may be poss.
    sigpic
    Wastedincome420@yahoo.com

    CURRENT STOCK LIST:
    00' e38 750iL HighLine=Highway Queen
    92' e30 318 vert=Aint going anywhere
    91' e34 535iM=Aint going anywhere
    91' e34 525iA=For parts
    92' e34 535iA=For parts

  • nando
    Moderator
    • Nov 2003
    • 34827

    #2
    yes, somewhat.
    Build thread

    Bimmerlabs

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    • wastedincome
      E30 Modder
      • Aug 2004
      • 906

      #3
      So what tire size would I need to run??
      sigpic
      Wastedincome420@yahoo.com

      CURRENT STOCK LIST:
      00' e38 750iL HighLine=Highway Queen
      92' e30 318 vert=Aint going anywhere
      91' e34 535iM=Aint going anywhere
      91' e34 525iA=For parts
      92' e34 535iA=For parts

      Comment

      • Rigmaster
        No R3VLimiter
        • Jul 2004
        • 3464

        #4
        Originally posted by wastedincome
        So what tire size would I need to run??

        You'd need to run gocart tires!! :)

        You can do the math- if you have a 4.27 now and want to run a 3.73 but keep the same basic RPM's in each gear- just figure out what size your current tires are (diameter and/or revs per mile) and find some that are close to the same percentage change as the diff change. Just some quick math (i.e.- could be wrong....) shows that a going from a 4.27 to a 3.73 diff- the new ratio is 87.4% of the old (numerically)- so you'd want to have a tire that changes the same amount. Assuming a 195/65R14 OEM tire has 867 revs per mile (based on tirerack.com)- then you'd need a new tire that has 992 revs per mile (!!) the smallest diameter 14" tire I found in a quick search is a 205/50R14 drag radial which shows only 939 revs per mile- so you might have trouble finding a tire that is small enough.............

        Seriously, why not just get a 4.10 ratio diff, you would hardly notice the difference, and they are readily available in both small (4cyl) and medium (6cyl) case sizes.


        Bret.

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