The OFFICIAL 2011/12 WRX wheel/tire thread - Page 16
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This is a discussion on The OFFICIAL 2011/12 WRX wheel/tire thread within the Suspension & Wheels forums, part of the Tech & Modifying & General Repairs category; Originally Posted by KHP Ok just a different perspective. Instead of just assuming that .2 difference in height difference is ...

  1. #226
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    Quote Originally Posted by KHP View Post
    Ok just a different perspective. Instead of just assuming that .2 difference in height difference is "nothing". Lets actually do some calculations.
    Cool....did you remember if you saw the difference in differential revolutions as the diameter increases by .1 at 65 mph?

    I'll be sure to post back if I see any negative affects over the years of ownership.

    I always wondered how camber effects the diameter of your wheel/tire. What variables would i use to figure that out?

    :-)

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  3. #227
    KHP
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    Quote Originally Posted by boostem View Post
    Cool....did you remember if you saw the difference in differential revolutions as the diameter increases by .1 at 65 mph?

    I'll be sure to post back if I see any negative affects over the years of ownership.

    I always wondered how camber effects the diameter of your wheel/tire. What variables would i use to figure that out?

    :-)
    It should be about less than half that at .1" height/diameter so <2 turns every 30 seconds. That's less than half the energy that the diff absorbs. Also keep in mind running the same size tires (diameter wise) the diff would be at rest (very close to 0 turn difference between front and rear axles) when driving on a straight line and this gives it time to rest/cool off.

    With your current setup your diff never rests as it constantly absorbs some energy at city speeds to quite substantial energy once you hop on highways.

    Regarding negative effects you may or may not feel any negative effects during normal driving. Viscous couplers usually fail gracefully (you end up with a completely open center diff). I've seen some diffs fail in bad way where they completely lock up and you end up with a binding drivetrain whenever you turn.

    Negative effects of open center diffs is quite hard to feel until you end up in some low traction situations. The car may feel like it lost its' dynamic handling and it will not be able to transfer power well between front and rear axles.

    Regarding camber I would like to believe that Subaru ran the rear tires at a lower pressure to help with the more pronounced positive camber and also lighter weight on the rear end from the factory. Factory pressure is 32R 33F.
    Last edited by KHP; 01-02-2014 at 01:39 PM.
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  4. #228
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    i have a sizing question. i have an '11 wrx sedan on stock suspension. looking at getting 18x8.5 Rota G-Force (5x100/e48/56.1). What is the meatiest tire i could get away with? without rolling or lowering

  5. #229
    Toboggan T0rque's Avatar
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    offset of 48 is the problem with the above statement


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  6. #230
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    Also an 18x9 with an offset of +38 is NOT the same as an 18x10 +38 there is an inch difference in the wheel the offset is different like I stated above.


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    what offset and tire size would i need to run with the 18x8.5 to avoid problems?

  8. #232
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    you arent going to run into problems with an 18x8.5 et 48 its just the look that isnt the greatest

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    this is 18x8 et 48 with 235/35/18 see how far into the fender they sit? Needs to be about a 40 or 42 on an 18x8 or 8.5


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    oh yeah that does look pretty bad. didnt realize 48 were set in so far...

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    Click image for larger version. 

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    This is an 18x9.5 with a 38 offset and 275/35/18 tires

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    This is an 18x9.5 with a 35 offset and 265/35/18 tires


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    the 18x9.5 with 35 looks great. is that on stock suspension as well?

  12. #236
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    No it with the konis and 08 tein s techs so its lowered like an inch maybe


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  13. #237
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    18x9.5 et 40 on GR wrx tires 255/35/18 how much rolling is required on coilovers

  14. #238
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    I'm getting close to making my decision... its between 18x9.5 +43 or 18x9 +38 on 255's.

    My question is: Anyone running 9.5" front have rubbing issues on hard turns. I'm a very spirited driver and would like to run the wider (concave look) but concerned about rubbing inside wheel fender. I'm not slamming the car, it'll probably have a finger gap. I'm on coilovers running stiff Eibach ERS springs. Thanks!
    Last edited by iH4; 02-10-2014 at 12:56 PM.
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    Information overload going on here!! Just to clarify, 18x9.5 et38 with a 255/35 or a 265/35 going on a stock 2011 WRX with no intentions of lowering, will work? New sways may be as far as I intend to go for now. Now being the next 3-4 years.

  16. #240
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    Stock 2013's WRX

    Plasti dipped for almost a year now!
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    Last edited by gelmanskiii18; 02-20-2014 at 07:07 PM.

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