I used to own this machine but sold it years ago. It's been sitting unused in a workshop so last year I asked if I could borrow it back for a while.

 

Was there any update to this? Now that I've got my AP Racing Pro5000Rs installed, the OEM spindle stiffness appears woeful at 1.4G longitudinal and 1200kg (2650lb).....

 

If you are still on OEM hubs, that is the source of most of the flex in an NA/NB. Just adding big billet hubs eliminates probably 90% of pad knockback and reduces flex enough to change pyrometer temps across the tread.

 

I’m on E30 hubs, so perhaps still something from that... changing pyrometer values in switching from OEM is crazy though! Would be scary seeing that on a high speed camera.

Theres no perceptible knockback with this setup, but it does have stiff knockback springs. From my pad taper I am suspecting the lugs are being deflected by pure braking torque. But I need to do the FEA to see what’s going on in detail.