Depends... according to that chart:
Stoptech F/R-> 63.74%
OEM 91-96 ---> 61.59%
OEM 97-05 ---> 54.02%
2002 Type R--> 55..24%
Brembo --> 50.00%
So.... according to that table a Stoptech F/R is too front biased for a stock 97+ or a 2002 Type R
It also really depends on tire size, and suspension setup what is the correct bias. Now add brake compound to the mix.
So... a Brembo F/R with a more aggressive F compound than R should give a closer to OEM bias. The question is what actually is the bias? You would have to do testing and try several compounds or go to a brake bias adjuster.
Yes, changing pad compounds front to rear does affect the bias, bite, characteristics of the braking system. Also as you pointed out later, the in-line proportioning valves of the OEM system is another variable, as is brake rotor swept-area and height of the pad (which affects where the pistons are centered in the given rotor diameter).
It appears Stoptech did their homework quite well on the NSX. The bias that Stoptech came up with is very similar to the Brembo F50/Lotus setup that FXMD developed with Titanium Dave - as wells as what Performance Friction calculated from their JGTC NSX, FXMD NSX, and OEM NSX experience. (all of which range from 55-65%).
Performance Friction
PFC calculated the best bias by looking at: front and rear piston size, rotor diameter and width, pad swept area, brake torque of said cars (measured at the wheel), weight distribution, center of gravity, and many more aspects of the stock, FXMD, and JGTC cars to come up with their brake bias.
Because of this development, we run the same aggressive PFC-01 compound pads front and rear on the FXMD NSX, with the stock master cylinder, and no proportioning valve and the setup is EXCELLENT and by far one of the best street or race brake packages i've ever run.
Forged Monoblock Calipers are extremely light, 4 pads per caliper! (multi-pad technology - 1 pad per piston), the largest rotors available on an NSX - 14" front and rear, and it IS a race caliper that's used in ALMS, JGTC, Indy Cars, Daytona Prototypes, etc...
Stoptech
I've never tracked a Stoptech-equipped NSX (but have many 350Zs and other cars) and their motorsports background showcases their ability. Still loosely based off of a Brembo design and fairly heavy but has an improved "bridge" design to increase rigidity. They run these exact brakes in their Grand-Am Cup cars. I would say its a great option to go with.
Rotora
Havn't driven on their setup for the NSX, but won the 25-Hours of Thunderhill on these brakes set up for an E36 M3 -which worked flawlessly and this too says a lot for their abilities. I've never been a fan of Rotora and until they had an influx of $ to develop and engineer a better product, their products were not very good. But now, they are more than acceptable and durable to handle racing abuse at that level and win. The company isn't as involved in racing as Stoptech and the design isn't a generic copy of an existing caliper, but It also might be a good entry level option.
Brembo
F50/Lotus Titanium Dave/FXMD setup - Great bias, but the F50 is a heavy caliper but looks much beefier and adds much needed front bias.
Lotus/Lotus setup - is also good but needs a prop valve, different brake pads F-R, and still might be too much rear bias.
-Both the F50 and Lotus are ~15year old race technology and heavy.
"Indy" - there is no such thing as an "Brembo Indy" caliper. That's just the name it was given by a certain vendor but Brembo dosn't acknowledge anything is called an "Indy" caliper. It's just a modern 2-pc motorsport caliper that is much lighter than the GT series street calipers. Lightweight, through-bolt (with nut) design makes for a much stiffer and rigid caliper than all of said calipers above which have a bolt that's threaded into the other side of the caliper which makes for a weaker caliper compared to a through-bolt design. (***other than PFC which is a Forged Monoblock)
What's the Front and Rear piston sizes (all) of the WP brake system? If the opportunity presents itself, I wouldn't mind testing a WP-equipped NSX. I also second the vote for Ryneen as he is a very capable driver who is one of the few on this forum who track their car and get the most out of it.
