[200q20v] V8 vs old S4 - tramming
optic at halcyon.com
Fri Mar 2 11:11:39 EST 2001
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.
> Suspension design greatly effects the magnitude of observed tramming. Older
> cars not designed for wide, low tires and wheels tend to exhibit this
> problem in a far more extreme manner Vs modern designs intended to work with
> wiiiiide rubber.
> The ur-q with stock 215-50-15s on 8" wheels is far more sensitive, for
> example, Vs the 200q20v with factory tires and wheels, but the ur-q driver
> is expected to accept this as part of the handling/ease-of-use tradeoff made
> by Audi. Porsche 911s with monster tires exhibit major-league tramming as
> well, BTDT.
Some years ago I had this "characteristic" on a '90 VW GLI-16v with
stock 15" BBS wheels. The 205/50 Dunlop D40M2s wanted to steer the car
themselves and at times it was quite a handful. Thankfully, they wore
out quickly. Replacement with Dunlop SP8000s made the
follow-the-grooves problem vanish. Simply amazing. It was like having
a new car.
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