Apr 27, 2009 update to the Mazda RX-7 project car

Shades of Exhaust

Behold: Racing Beat's Streetport Exhaust System.
Here's an up-close shot of the stainless steel header. It saves 5 pounds over the regular steel version.
We will install the sensor bung right before the muffler to collect A/F readings from both chambers.

We came back from lunch yesterday to discover we had received our Racing Beat Streetport Exhaust System.

Although we’re currently running an older Racing Beat system on the car, it had been hacked up by wayward mechanics in the past. This system served us well for at least six years after we bought it off a friend—who also purchased it used.

We would estimate it to be around 15 years old, and overall it has held up well. In fact, it will likely make its way onto our 1979 RX-7. While it may not be the highest-flowing system, the Racing Beat Streetport Exhaust makes good power while keeping the noise to a reasonable level. (An uncorked rotary is loud, so if you value your hearing you will muffle yours.)

Our RX-7 had a date at The Mitty with Jerry and the guys at DIYAutoTune. They planned to install a Megasquirt and tune the car, and we wanted to get the system leak-free before bringing it up to the event. The Streetport system is a true dual setup until the rear axle, so we mounted a sensor bung right before the muffler. That way the system would collect air-fuel readings from both combustion chambers. We confirmed that the exhaust was buttoned up to ensure accurate readings.

We pieced together this system using Racing Beat’s stainless steel header, which will save us 5 pounds over their regular steel version. This will be connected to a couple of pre-silencers and finally to the muffler. Since we’ve decided to dump the six-port actuator for simplicity’s sake, we ordered pre-silencers for a 12A model. These pieces do not have the built-in vacuum pickup tube.

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Greg Voth
Greg Voth Dork
4/27/09 4:54 p.m.

We came back from lunch yesterday to discover we had received our Racing Beat Streetport Exhaust System.

Although we're currently running an older Racing Beat system on the car, it had been hacked up by wayward mechanics in the past. This system served us well for at least six years after we bought it off a friend--who also purchased it used.

We would estimate it to be around 15 years old, and overall it has held up well. In fact, it will likely make its way onto our 1979 RX-7. While it may not be the highest-flowing system, the Racing Beat Streetport Exhaust makes good power while keeping the noise to a reasonable level. (An uncorked rotary is loud, so if you value your hearing you will muffle yours.)

Our RX-7 had a date at The Mitty with Jerry and the guys at DIYAutoTune. They planned to install a Megasquirt and tune the car, and we wanted to get the system leak-free before bringing it up to the event. The Streetport system is a true dual setup until the rear axle, so we mounted a sensor bung right before the muffler. That way the system would collect air-fuel readings from both combustion chambers. We confirmed that the exhaust was buttoned up to ensure accurate readings.

We pieced together this system using Racing Beat's stainless steel header, which will save us 5 pounds over their regular steel version. This will be connected to a couple of pre-silencers and finally to the muffler. Since we've decided to dump the six-port actuator for simplicity's sake, we ordered pre-silencers for a 12A model. These pieces do not have the built-in vacuum pickup tube.

thatsnowinnebago
thatsnowinnebago Dork
5/4/09 1:46 p.m.

Racing Beat's headers have such nice flanges

MadScientistMatt
MadScientistMatt UberDork
5/4/09 7:40 p.m.

It's definitely a very impressive system, now that I've seen it in person. Probably one of the best sounding rotaries I've heard.

Greg Voth
Greg Voth Dork
5/7/09 4:18 p.m.

Racing Beat really does make a nice product. It bolted up perfectly and is nice balance between sound and performance. I have more of a straight through "custom" exhaust on my 79 and I can't leave the driveway without the neighborhood knowing.

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