Anybody using a GT3 master cylinder

[rastta]

Originally Posted by Topless

Nope, but a bunch of 987 drivers did at some point for the reasons you suggest. A lot of them reported: "awesome!", "totally transformed my brake pedal" "solid as a rock now".

My impression after driving hot laps in several of their cars vs mine with stock master cyl? It did not do what they wanted it to do. I noticed no significant difference between the two. I chalked-up the comments to confirmation bias. YMMV

Since I have a 987 Cayman S as well as the Boxster - I had been following the forums and I never quite understood the whole GT3 Master Cylinder thing. My Cayman's pedal is very firm. Same with my 986 Boxster S. Pedal location on both is fine for heel/toe as well.

[Lemming]

I think this is more about personal preference. My spb brakes feel over boosted, making it very easy to over brake. My last race car had a dual-master cylinder setup with no boost, which, when set up properly, made it very easy to modulate the brake, but you had to push HARD. I believe the GT3 master and vacuum setup do the same (you must increase foot pressure to get the same brake pressure) for the spb, but I'm finding it hard to justify the cost when I have other items still on my list.

Larger MC = equals shorter throw, but more foot pressure to build brake pressure.