I’ve always been puzzled how front/back brake balance is maintained when a different size caliper & rotor is installed - not that I would claim to know a lot about brakes.

 

I am fairly sure the 376 mm rears have very little if any greater stopping power than the 326/325 rears.
They have almost identical pad area and very similar rotor braking surface area (the 376 mm brakes have a yuge central blank area).
Other than the improvement in looks (my main reason for changing over) the only difference I can guess at is the larger brakes would be less susceptible to fade, which of course is only a factor under severe and protracted braking such as at a track day.
In the thread I started about the rear brake upgrade a few early posters suggested that I might need to get the ABS recalibrated but I never bothered with this and I have never had any problem with the brakes. I also suspect the OEM brake balance system/calibration easily and automatically adjusts for any slight increase in rear braking power.

 

Keep in mind that stopping power is a function of clamping force x effective radius. If you take the same pad/caliper combination and apply it to a larger diameter rotor, you increase the effective radius and braking torque. The change from 325 mm to 376 mm rotors will yield ~15% more stopping power just due to the effective radius change. As mentioned, you also have the benefit of more mass and area to absorb and dissipate heat for more braking endurance.

 

Am aware. I can lock up the rears on the street with 305 rubber at will now...so unless I am doing "track" the larger rears at 9.5lbs more are not likely helpful, and even then the fronts are doing 90+ percent of the work. The 326mm rotors are larger than the 996 rears I had on a 700hp car that got tracked and I did not lack in stopping power...issues were front temps....never the rears....at VIR.

 

I am in the searching of pads for the same application as OP and I have no luck. The closest I have found is probably EBC Bluestuff NDX, but they are dusty as hell. R4S are constantly reviewed as bad for track, as they glaze easily.
I wish to go to a track once or twice a year max, so I am not so happy about having two separate sets and switching them to be honest.

 

Since my original post, and with additional investigation, I went with VAP Girodisc 2-piece rotors and have continued with OEM pads. I have not found a suitable aftermarket pad that provides the same combination of decent street manners (if a bit grabby) and good track performance. The only downside to the stock pads is the dust, but that's a compromise I am willing to deal with. I have done 6-7 track days with this combination and have had no fade or brake-related issues. I had a couple of instructors who track Porsches regularly who were impressed with the brakes on my F-Type. I'm still hoping for someone to introduce a better pad option, but it seems that the unique pad shape of the OEM calipers means there are very limited options.

 

I run R1 Concepts eLINE slotted and drilled rotors and Porterfield R4-S pads. I don't track the car, however I do road race it and am quite happy with the setup.

 

Did you track the car also with OEM rotors, do you have a comparison with VAP?
The dust on OEMs are so crazy. I have ceramic coated black rims and the fronts are all covered in sticky dust instantly.

 

I tracked the car once or twice with the stock pads and rotors, then decided to upgrade rotors. I didn't have any issues with the stock pads and rotors, but I also wasn't pushing the car as hard as I do now. The VAP rotors are much lighter (at least 40 lbs per car set) and my post-session rotor temps are lower now than with stock rotors. With VAP rotors, stock pads, and Motul RBF 600 fluid, my car stops consistently well throughout 20-minute track sessions. I am running 265/305 PS4S tires, so going to stickier tires would put more heat into the brakes and might cause issues with the stock pads.

I have seen mixed reviews on EBC Blue Stuff NDX pads, but that is the case for any pads that try be to street and track applicable. I don't think I have seen anyone who has run Blue Stuff on an F-Type, so I would be interested to hear how it goes if you take that path.

 

The UK member that did the test fit for the Wortec rotors used EBC Yellow Stuff pads initially. I'm not sure if he stayed with those, nor what he thought of them in the long term. I haven't revisited the whole thread, just enough to confirm my recollection of Yellow Stuff:

https://www.jaguarforums.com/forum/f...2/#post1879607