Congrats, Andrie!

 

This car is really nice and the driving was very entertaining. Few questions:

-Why does the exhaust tip stick so far out?

-What do you think of the AD08s? Why are you using those and not a true R-Compound?

-I know you've had the Wilwood kit a while now...what do you think of the durability/longevity/brake bias etc?

 

@VitaRenovatio, as Tom said, we are running JRZ RS Pro. The balanced is pretty good on low speed. Still need a little more front high speed grip.

@Dipstick, Thanks! Hey, do I know you from the day I used to own an NSX?

@clarkster009,
The exhaust stick that far on the picture is because the picture was taken at Thunderhill. We were dinged for sound over 103 dB and had to install and elbow pointing away from the sensor.

We have to use street tire for the Global Time Attack and Super Lap battle down the road. We can run R compound for NCRC, but the car setup might change. We don't have the resource nor the funds to have multiple different setup.

We are still testing few street tires. We tested Direzza Star Spec, Hankook RS3, and this past weekend Yoko AD08. We will do one more test day this weekend with the Yoko AD08 and after that I'll do a review or write up when I find the time. That means after my taxes and working on the car But, so far, pure speed alone, the RS3 is fastest. Although we won't have that luxury when Super Lap Battle came, as they require tread wear of 180 or more for street class.

I spec my own Wilwood kit. I chose the pistons size and rotor size to give me the front brake torque 93% of factory strength. We're still experimenting with brake compounds. So far we tried Carbotech XP10 and XP12 mated with XP8 in the rear. Compared to the two, I liked XP10 better.
A lot of people said, well, as long as you can lock the tires, you don't need big brake. Braking to me is about maintaining at maximum breaking (treshold) the longest. With good brakes, I can modulate to be at the treshold most of the time and give me better balance and control.

I've been using Wilwood superlite caliper on my old race car (TSX) and pretty happy with it. I was hesitant at first, due to my past experience with their Dynalite line, which is pure garbage if run as front calipers IMHO. The superlite, while not as good as Brembo race caliper (not street), is as good if not slightly better than brembo street caliper. And for the price, which was a big determining factor back when I was in process of building my TSX, is probably the best bang for the buck.

The TSX had 4 season of racing. I race about every month and inspect the caliper every year without taking it apart. I noticed it has yet need rebuilding. Keep in mind this is race car that never see street driving. As far as brake pads, it is harder on the TSX than the S2000. The TSX pads usually run 3 weekends. On the S2000, so far we've seen 3 weekends and pads still about 60-70%

Full specification of the car can be found on my website at www.prima-racing.com. Click on the tab on the top to navigate through the site.

 

Thanks for the reply. I am confused by what you mean of "93% of factory strength"? Do you mean you gave it more rearward bias by having a piston area less than stock? Can you tell me the piston sizes you chose? From my reading, I thought that most people would prefer more bias shifted to the front brakes.

I actually think the reason Wilwood doesn't have as good of a reputation among the S2000 guys is that when the car first came out the only kits being sold were using the Dynalite...which uses a tiny pad. Whenever anyone says "Wilwood" they associate it with that.

 

any more information on the wicked tuning monoball suspension bushings? pictures, expected price?

 

x2

 

I have to dig up my notes. But it is pretty simple calculation. Measure the stock piston, and what's the lever arm (diameter of rotor for simplicity). Calculate torque based on assuming caliper pressure of 1 psi. Do the same for the wilwood caliper. Actually, Fastbrakes helped me putting all of it together. You could contact them and request my spec, not their off the shelf spec.

I choose to reduce front brakes cause I couldn't increase rear brake without going aftermarket caliper which means more cost and loosing emergency brake. I learned a while back that mid engine like slightly more rear bias compared to front engine cars. Add wing to the car, and it is almost like driving in the rain, where you need more rear brakes.

If it is an older ABS system I would have yanked it out and put a bias valve. But the S2000 ABS system is so good, I think I'd be at disadvantage for not running them.
The pad has little to do with it. The dynalite is just too small and don't have the rigidity to be a front caliper on production car.

 

yeah ...mine just rolled 102,000...sold yours?

 

Sold mine in 2002. Used the money to buy truck and trailer and started racing. Missed the car!

 

I'd appreciate if you could find out the piston sizes. It is interesting to hear you say you like more rear bias, because from what I have heard about people doing the Accord caliper swap, is that they like the increased front bias. I know a member robrob on here said he used to be able to lock up the rear brakes first on the stock caliper.

They do make a Wilwood rear kit which retains the usage of the parking brake...but then you are shelling out another $1250.