Hi Nick,
There are several other variables that affect the rear sway bar issue on Alfas. Here's my two cents:
If your 1750 doesn't have a limited slip differential, adding a rear sway bar will promote inside tire lift and wheenspin while cornering. I found this with a new 1750 square tail Spider in 1971, and cured the issue by adding a LSD from a 1972 2000 Spider. Your suspension shop owner likely had a LSD in his 2000cc GTV.
Modifications like front negative camber or adding castor increase front grip, and tend to make the rear "looser". Sometimes to the level where an existing rear swaybar needs to be removed to reduce the oversteer.
So... it's a question of balancing front and rear grip and the contributing factors are:
Front and rear swaybars, and their stiffness relative to each other
Front and rear springs, , and their stiffness relative to each other
Front suspension alignment (camber & caster)
Presence of a Limited slip, and the level of "lockup"
Also different size front & rear tires
This balancing can be fun, or frustrating. It's like trying to shorten legs on a table; one is always too long or too short...
Finaly, remember the "Design of Experiments" theory: in order to evaluate the effects of changes, they must be done one at a time.
Quote:
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Originally Posted by alfanick
I've read a few articals and comments stating that when you stiffen and lower the suspension on a GTV 1750 or possibly any 105 that you don't really need the rear sway bar. I bought my 1750 knowing it ran without one. I had a suspension shop look at it today and the owner reckons that he has read it too but that in several years of racing that he proved that the car (he had a 2000) was 2.5sec quicker than cars running without. The class he ran in was stock engines etc.
He wants me to find a sway bar and re-install it.
Appreciate all thoughts before I go down that track.
Nick
GTV 1750
In Perth (The most remote Capital city in the world)
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