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    Re: 997TT geometry settings

    cannga:
    WTT997:

    Hi,

     Anyone on the alignment list running on 20" wheels? I've been trying to find out the ideal combination for quite some time. Currently on GMG springs, GT3 sways with tarrett drop links, adjustable rear toe links, and front tie rods.

     Would appreciate any inputs.. Thanks a lot!

     Ronnie


     

    I have not ran across any article that states the need to change alignment settings according to wheel size. Since the most noticeable change from bigger rim is a harsher ride, if anything needs to be done, I would think  it is related to reducing compression dampening or spring rate, not alignment change.

    So my vote would be to do the same as what a lot of people are doing: Keep everything stock, except increasing the front camber to a more negative value like the GT2. Mine is around minus 1.2 degree.

    If you are so inclined and feel the steering is lazy, the second step you might want to consider is very slight front toe out. Mine is at minus 2 minutes.

    And that's it. Nothing dramatic but it would wake up your Turbo IMO.


     Just got mine aligned at the dealer and they performed what they call their sport setting.

    I was going through rear tires every 5000 miles with the inside down to the wires caused by a factory rear camber of -2.00.

    The car is not lowered and final values are as follows:

     

    front camber: -0.4

    front toe: -0.01

    front caster: 7.15

    rear camber: -1.33

    rear toe: 0.01

    The car feels much tighter in city driving and I cant wait to really test it on some twisties.

     


    --

    2007 997 TT Protomotive

     


    Re: 997TT geometry settings

    AAHTT:

    Just got mine aligned at the dealer and they performed what they call their sport setting.

    I was going through rear tires every 5000 miles with the inside down to the wires caused by a factory rear camber of -2.00.

    The car is not lowered and final values are as follows:

    front camber: -0.4 <-------- Consider  - 1.2 ?

    front toe: -0.01 <------- SmileySmileySmiley

    front caster: 7.15

    rear camber: -1.33

    rear toe: 0.01

    The car feels much tighter in city driving and I cant wait to really test it on some twisties.

    Hi Anthony,

    Very nice. I am mildly shocked to see even a dealer is using the front toe-out setting (minus .01).
    This change makes the steering response razor sharp -- no lag, very similar to the GT2. A number of well known tuners in Southern Cal. are using it -- but because it makes the car so "sensitive" Smiley, I am surprised to see a dealer committing to it.

    You might want to consider increasing the front camber to some more negative value. Yours, at minus .4, is actually still stock value, and the change to around minus 1.2 is nearly universally recommended.


    --

    Regards,
    Can
    997 Turbo + Bilstein Damptronic (Review) + Cargraphic Exhaust (Heavenly Race Car Noise Smiley Review)


    Re: 997TT geometry settings

    cannga:
    AAHTT:

     

    Just got mine aligned at the dealer and they performed what they call their sport setting.

    I was going through rear tires every 5000 miles with the inside down to the wires caused by a factory rear camber of -2.00.

    The car is not lowered and final values are as follows:

    front camber: -0.4 <-------- Consider  - 1.2 ?

    front toe: -0.01 <------- SmileySmileySmiley

    front caster: 7.15

    rear camber: -1.33

    rear toe: 0.01

    The car feels much tighter in city driving and I cant wait to really test it on some twisties.

    Hi Anthony,

    Very nice. I am mildly shocked to see even a dealer is using the front toe-out setting (minus .01).
    This change makes the steering response razor sharp -- no lag, very similar to the GT2. A number of well known tuners in Southern Cal. are using it -- but because it makes the car so "sensitive" Smiley, I am surprised to see a dealer committing to it.

    You might want to consider increasing the front camber to some more negative value. Yours, at minus .4, is actually still stock value, and the change to around minus 1.2 is nearly universally recommended.

    Thanks Can, you are right they basically left my front camber the same and since I was leary of excessive negative camber from my experience with the rear tires, I decided to let them leave it alone. Plus I am not sure you can get -1.2 on a non lowered car?.

    I felt the front toe driving difference immediately as my car's front toe was too conservative before. I was surprised too they would offer anything called sport setting and they are offering it now for 199$, which is cheaper than other local shops.

            


    --

    2007 997 TT Protomotive

     


    Re: 997TT geometry settings

    Yes you need to lower the car to get more cambers as I understand it.  Now that I am -15mm max camber on the front that I could get was neg 1 degree 6 minutes...


    It's your toe I am a little concerned with, especially the rear.  You want a healthy amount of positive toe on the rear or the car will be a handling nightmare!

    TIP: if your steering feels too light now then this can be rectified with more positive front toe.


    --


    Click for bigger picture!


    Re: 997TT geometry settings

    AAHTT:

    Thanks Can, you are right they basically left my front camber the same and since I was leary of excessive negative camber from my experience with the rear tires, I decided to let them leave it alone. Plus I am not sure you can get -1.2 on a non lowered car?.

    I felt the front toe driving difference immediately as my car's front toe was too conservative before. I was surprised too they would offer anything called sport setting and they are offering it now for 199$, which is cheaper than other local shops.

    Regarding front camber, I *vaguely* remember that the max front camber allowed without lowering is minus 1.2. If you have any question, just call either Stuttgart/RSS or Lucent. BTW, Lucent would charge you 160-180 for alignment change (GMG $280 Smiley Smiley).

    Re. rear camber, yes I know my tires wear more inside also from the neg. camber that is same as yours. But it has lasted 12,500 miles on Michelin, so it is really not bad at all.

    Re. front camber, I'll let you know how the front camber of minus 1.2 affect my tires in the long run, but many of us do this and I haven't heard much complaint. So I still think it's worth a try; I think you will be amazed. It's basically the stock setting of GT2/GT3 and is a near universal recommendation from tuners, even if it affects tire wear.



    --

    Regards,
    Can
    997 Turbo + Bilstein Damptronic (Review) + Cargraphic Exhaust (Heavenly Race Car Noise Smiley Review)


     
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