[200q20v] V8 vs old S4 - tramming

[Edward J Kellock]

I thought negative camber was only helpful in maintaining
the tire surface flat to the road surface in extreme cornering
when the whole car is leaning heavily.  Toe adjustments are what
affect turn-in.  Right?

Ed
Colorado Springs.

On Sat, 03 Mar 2001 00:40:09 -0800 Linus Toy <linust at mindspring.com>
writes:
> At 12:20 PM 3/2/2001 -0500, Glen Powell wrote:
> 
> >The follow-the-grooves problem (also know as 'tramming' I think) is 
> mostly a
> >function of tire and wheel width and tire profile. As width goes up 
> and
> >aspect-ratio goes down tramming becomes more and more of a problem. 
> Two
> >otherwise identical cars but with substantially different 
> tire/wheel widths
> >and tire aspect ratios will behave very differently. This is a 
> trade-off
> >manufactures have to make based on the target cusomer and his 
> expectations.
> 
> I think the "problem" is more an issue of alignment.  On my '91 
> 200q, I've 
> had stock size 215/60-15, '92 S4 size 225/50-16, and my favorite, 
> 235/45-17.  The most significant tramlining I've experienced was 
> with the 
> 15" wheels & tires, before I had the suspension realigned.  The 
> alignment 
> factor contributing most to this effect is camber--too much negative 
> 
> camber, to be exact.  While more negative camber helps the car 
> "point" 
> (turn-in) better or helps wider tires clear the fenders, the result 
> is more 
> tramlining effect.
> 
> Remember that on our cars with mac-strut fronts, lowering the car 
> beyond a 
> certain point often means you cannot reach alignment specs for 
> camber.  One 
> "trick" to minimize the tramlining effect of too much negative 
> camber is to 
> increase your toe-in.  This can't be too good for tire wear, 
> though.
> 
> --Linus
> *--------------------------------------------------------------------*
> *  Linus Toy                      Insanity is doing the same thing   
> *
> *  Mercer Island, WA              you've always done and expecting   
> *
> *  linust at mindspring.com          different results                  
> *
> *                                      - Roger Milliken              
> *
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