Zamani wrote:Sorry Jim, you don't know how to drive. You should be able to gain 1 sec with solid 250mm front rotors and stock pads.
Serioulsy, you nailed it Jim. My car is slightly lighter than yours and on SOME turns after a couple of laps, you just wonder what happened to the brakes. My current setup is, stock rotors and calipers, Porterfield R4S pads and Valvoline synthetic fluid.
Hi Z
I had a look at whe R4S web site, and this is what they had to say...
"R4-S High Performance Street and Autocross
For high performance and heavy-duty street conditions. Perfect for prolonged everyday street use while also being capable of tolerating the most severe street use without any fade. Rotor friendly of course. The R4-S friction level will give you an impressive increase in stopping ability with very minimum pedal effort. R4-S compound has the absolute lowest noise and dust levels, far below OEM equipment or any other high performance brake material. Good for autocrossing, some drivers schools, solo events, and rally’s. The R4-S compound is available for virtually any vehicle sold in the US. We also offer the R4-S in pad sizes for competition type calipers that are used under street driven conditions"
I'd say you need to get some more agressive pads right away!
Using street pads on a demanding track is just asking for trouble. The pads will get to hot and become useless outside their designed heat range.
Have you tried performance friction race pads, or the DS3000?? both EXCELLENT on the GTV6/75 with uprated standard set-up, add a little cool air ducting too.
Cheap upgrades can make a useful difference!
Do you have abs?? if you do, is it cutting in at every braking zone?
But, as we all know, a road car on the track, will always lead to compromise
So, come on z man........time for you to build a dedicated track beast with 24v, or a 4pot turbo

DO IT, you know you want to
