Let's say a car is corner weighted. You then measure the distance between the fendor and the wheel center of both the right and left rear. Should these distances be equal?

 

Not necessarily.

 

In a perfect world, yes, but the answer is no.

Why do you ask?

 

when i got my car aligned and corner weighted, they put my car on four scales and adjust the height of each of the coilovers

 

Cornerweighting is only possible with height adjustable suspension such as coilovers. The reason being your car's weight is not evenly distributed, and some corners will weight more/less compared to others. Cornerweighting ensures that load is transferred evenly during cornering, and to do this the car must be set so that static weight is as evenly distributed as possible across the car's 4 corners. And to do that, the height at each corner is raised/lowered. Common sense will tell you that there is no way a car's weight is evenly distributed from the factory (gas tank on one side, driver on one side, battery on one side, etc etc) so having all heights equal will not lead to a perfectly balanced car.
Also, no offense, but it sounds like you are a little unfamiliar with the purpose and principles behind corner balancing, which itself is a fairly complicated process. I hope you took it to a place that knows how to do it right (disconnecting swaybar endlinks, adding balast to the driver's seat, etc).

 

It depends on your coilovers. If your coilovers have independent spring perch and body height adjustments (like say the Endless function x's), then yes, the measurement should be pretty much equal. If your coilovers do not have independent spring perch and body height adjustments (like say the Ohlin R&T's), then the measurements will probably not be the same.

fwiw, some people measure from the bottom of the rim to the inside of the fender well. This measurement will be the same regardless of tire pressure and for some is easier to measure than the "center" of the wheel.

 

Do they do a camber correction for true center?

 

Wow, it was just a hypothetical question. And I am familiar with corner weighting and have adjustable coilovers.

 

I'll try to summarise a bit. The over simplified version is that the goal is to get your left to right balances as close as possible and to also get the weight transfer across the car's diagonals to hit 50/50. The Evo is slightly front heavy so there will always be a slight front weight bias.

Between the reasons mentioned above and the fact that virtually every car will have some variation in how the sheet metal skin "hangs" on it, it's not uncommon to see differences in fender clearence. I've seen cars that were "set-up" by matching the fender clearences have terrible weighting and balance when put on a set of scales.