Hello Guys,
From my own experience, getting a flush look with spacers depends on many parameters :
- The type of tires : some tires, even with the same dimensions, can be drasticaly wider than others (i.e Michelin PSS vs. Conti's for example )
So, chances of rubbing are least with narrower tires that are a little stretched.
- Alignment : the geometrical setup plays a hudge role. Particularly for the rear end where camber is adjustable. ( audi specs are within -0.5 and -1.6° if i remember well, and each 0.1° has the same effect that ~ 1 mm spacer for rubbing. Too much toe in can also lead to rubbing where bumper and rear fender meet.
- Ride height: the more your are low, the more you have chances to rub, but it's almost dependent on the alignement specs, more than ride height.
- Chassis alignement !! : i notices than my rear end was not symetrical: for a same spacer size (and same alignement specs): i had ~ 3 mm more room at he passenger side ! (so initialy, i rubbed on passenger side and did not at the driver side with my 12.5 mm ECS spacers). Since i track my car i little bit, i had an agressive camber set up done (-2.0°) and now, it doesn't rub at all with 12mm passenger side and 15 mm driver side spacers . (Yes, I dared ... ;o) )
So, My general advice should be to care about spacer at the verry end of your chassis mods:
Drop your car if you want / check and get a proper aligment / have in mind that your tires type plays a role also
Then, your can start a "trial and error" process. And if you want the best flush possible without any chance of rubbing, your will have to buy different spacers sizes. (10-12-15)
I personnally have 10 mm front and 12 mm driver side and 15 mm passenger side rear. without any rubbing (with -2.0 ° rear camber and not too much toe in)
Personnally, I prefer to not put spacers Under 10 mm as they don't have a real centering flange like the original hub. I think without these, shear stress in the bolts are exessive (bolt are aimed at traction stresses and not shear). But, i don't have knowledge of problems with 8 mm spacers (with minimal centering flange), though....
Please feel free to share your opinion on this!
Brest regards
Mathieu
EDIT: here is the set up:
(dropped a little more the car since these pics)
Maybe, i will try 12 mm front and 17 mm driver side and 14 mm passenger side rear (by machining H&R 20 and 15 mm spacers) for a litlle more flush look !!
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