Hello, we're building an NC for ChampCar. This means 7 to 24 hour races. My current plan is below; any comments or suggestions are greatly appreciated.
- RX8 front hubs, stock rear hubs. My car will be far lighter than the MX-5 Cup Cars which experienced rear hub failure. I'm hoping this plus the use of street tires and a vented rear rotor will mean no hub failures? We can't upgrade to RX8 rear spindles and hubs without being penalized.
- RX8 brakes all around, on Rayesbestos ST43s in the front, and whatever gets the brake bias right in the rear.
- Keep the stock radiator since upgrading costs points, but relocate or remove all the stock in front of the engine and heavily vent the hood. No fan. Hopefully this will provide sufficient cooling? What do the MX-5 cup cars run?
- Stock oil cooler, since upgrading costs points. From what I understand oil temps will probably stabilize around 260F?
- ecutek tuning for the no-lift-to-shift functionality.
- Header, full exhaust, and cams. The cams and header will have to be matched together. From what I've seen, the stock cam profile and VVT system results in little to no overlap at high RPM, so tuned-length longtubes are out-performed by shorties. I'm expecting this not to be the case with aftermarket cams.
- An intake which goes straight from the throttle body elbow to the front bumper (ram air), with an inline filter.
- Lastly, there's no minimum weight in ChampCar. We're going to remove the windshield and frame, and eventually experiment with different ways to reduce drag over the empty passenger compartment (probably with a flexible cover or balsa wood).
Does anyone know what was done to the sealed MX-5 Cup motors to get them to 200 bhp?