Remember, drive slow to go fast! Take a few laps at an easy pace, making sure to hit all your marks, and drive a clean, quiet (as in tire squeel) line. Chances are it'll be faster than going balls to the wall. I know my two fastest laps were one where I purposely relaxed and tried to make sure I slowed down a lot for the tight corners.
I got my helmet here:
http://www.bellmotorsports.com/
It's the Formula 1 model, and it's pretty light since it's a composite material:
Quote:
Formula 1 (Unvented)
Lightweight COMPO TECH Composite Shell; Plush fitting Removable Nomex Interior; D-Ring Fastener; Sizes: X-Small through XX-Large; Meets or Exceeds Snell SA Standards; Available in White Only
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If you only plan on Auto-X, you might be able to save some money with an open-faced helmet, it'll also be more comfortable on hot days, and give you more visibility. I got the F1 in case I ever drive a CAM car again or do Skip Barber... where the full coverage is safer and keeps the wind outta your eyes.