I've noticed improvements from s3 to ttrs breaking... The calipers are all aluminium way lighter than those iron rocks from oem... I even felt the car handling better when I installed the ttrs breaking...
Discs are proper heavy though compared to stock, i also have strut brace on my car to improve handling it does actually work made a noticable amount of difference on cornering etc
Difference is you went from s3 brakes to that setup where as OP has gone from poxy little tdi brakes to massive ttrs setup, and yes, if it spins freely without any friction it's down to the extra weight.
I think the goal here is more stopping power meaning shorter stopping distance meaning more security... That really iwas the main goal when I changed from 288mm to 312mm to s3 and finally to ttrs breaking. Non of the previous setup gave me the security this one does...
The weight of the caliper won't make much difference, It's probably lighter than a stock one. The difference comes about from the rotating mass and more so where the weight is concentrated.
The discs and wheels/ tyres act as flywheels. And increasing the amount of mass further away from the centre of rotation increases the moment of inertia. http://en.wikipedia.org/wiki/Flywheel
The TTRS brakes have cast alloy bells but there is more weight further out so this will have an effect. Are the wheels genuine Audi with the hollow spokes or are they replicas.
If you want performance and fuel economy the smallest lightest wheel is the way to go.
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