My entry for the January 2013 GtVault tuner challenge hosted by DjWess. (Link below)
The challenge was to take an NSX-R Prototype LM around Daytona Road Course without power upgrades in as little time as possible.
This car had about 200km on it when I started, and was in good condition, with an engine rebuild, oil change and customs rims (White RAYS VOLK RACING RE30s, to go with the Championship White body) with oil changes and car wash when the power ran out, the car made 537 hp at 10,000 rpm for most of the 1431.8 km driven for that challenge.
The key to this challenge was stability under brakes and traction out of the slow corners, which is where the differential and gear ratios come into play. The differential was set up to keep the car straight under brakes, allowing me to get a good line through the corner, get the car pointing straight to power out as aggressively as possible, which was aided by the long ratios for 1st and 2nd, even though 1st was never used, which also should have given me better acceleration up high to combat the massive drag incurred by the high downforce levels, which I believe helped in the traction zones.
Every lap comes down to the last 2 sectors through the high speed bus stop, where your entry point and use of curbs totally defines the speed you can carry, where your entry speed gets you the 4th sector, your exit the 5th sector. As shown below my best overall lap was far from my best sectors that I recorded in a 28 lap run.
The time was good enough to win the challenge by 3 tenths, with Brette taking second place.
I completed my best lap using a Driving Force GT wheel, which gave me better throttle resolution and allowed me to gently release the brakes to aid turn in on the hairpins.
Due to the downforce and choice of gear ratios, the top speed on the front straight right before turn 1 was 295km/h, while the top speed on the back straight before the bus stop was 285.
This setup was good for many laps in the 1:45's, however when you engaged skid recovery force, the additional grip beyond the limit allows sideways braking zones and 100% throttle on the exits, which got me to 1:43.791 before I went for non SRF times.
My video of the lap can be found here: