15 Nov

After last week’s findings, a lot has to be redone. The wastegate spring was changed to 12 psi and the 3-port controller swapped back in, the wastegate spring duty cycle table has to be redone and the volumetric efficiency table checked.

A surprising number of people have asked why the air scoop points aft:

1. When cornering, the inside front tire throws road debris inboard, with some landing in the area of the air filter. With the scoop pointing aft, it shields the filter element from small rocks.
2. If and when the car gets caught in the rain, it eliminates water intrusion (especially when parked).
3. There is a large rotating air “bubble” behind the windscreen. This was made apparent when the oil O-ring failed and oil ended up on the inside of the windscreen. Air flows up over the top edge of the windscreen and circles down toward the engine cover, then forward to the base of the windscreen again. As a result, air is likely flowing into the inlet of the rear-facing scoop.
4. There have been suggestions on cutting open the scoop to fix the issue. While appreciated, cutting back the the scoop any amount exposes the filter to the elements, or opens up a hole into the engine compartment, allowing hot air to get sucked into the filter.
5. At car shows, it keeps troublemakers from thinking it might be funny to pour a drink into the air inlet.

A proper scoop will be made using the moldless-construction technique.

Next week is a short week for me so I hope to check several items off the to-do list. First up is replacing all the low-quality rod ends with higher quality parts. At the same time, I want to heat and bend the steering arms to move them away from being so close to the brake discs.

Lastly, it looks like my brother and I will be signing up for the infield track at Autoclub speedway, one that’s more twisty and more attractive to cars that handle well. Top speed in this configuration is around 130 mph instead of the 150-160 on the big course.