Join Date: Jan 2005
Location: East of Seattle
The Portland Pipe
I'm planning to race at Portland International Raceway (PIR) next week. It's a smooth, relatively safe, well-kept track without elevation or many braking zones. And some from Seattle consider it boring. I've raced it numerous times on the bikes, and only a couple times in a car (over a decade ago). I find that it's fast with good flow, and appreciate that it turns right instead of left like most of the tracks out west. Allows for symmetric wear on the tires.
PIR is owned by the county, and is designated as some kind of park. So it has strict noise restrictions. I was once black-flagged on one of my louder little Honda racebikes for noise, and had to do a quick trackside modification to the exhaust to lower the decibels.
My car, despite the shortened exhaust and side-dump megaphone, isn't THAT loud, because it still has the Magnaflow muffler in place. But just in case, I fabbed up an exhaust diverter that points the noise down and to the right, away from the spectator side (and noise microphones) at right-turning tracks. My current exhaust points out the driver's side, which is obviously infield on left-turning tracks.
I was halfway through this project before I realized that PIR allows two noise variances per year, each for a vintage car racing event, including the race next weekend. But I finished it anyway, and call it the "Portland Pipe," jut in case.
Like usual, these are all scrap bits of metal. The flange used to be an old Harbor Freight loading ramp for an old motorcycle trailer I longer have. And the curved pipe was salvaged from my old exhaust. Remember, I never throw anything away. This project gave me a chance to mess around with my plasma cutter, which is kinda fun.
69 Spider, 2L, street; pursuit of happiness
69 Spider, 1.8L, race; happiness of pursuit