The Leno Law with Christian Robinson of SEMA - DWA! Ep. #941

The Chevrolet Corvette is a performance sports car known for strong acceleration and a driver-focused design. It’s often discussed in podcasts because it represents a mainstream, recognizable way to get serious speed and handling without going to an exotic supercar. In a conversation about fast cars, the Corvette is a common reference point for “how fast can a regular production car feel?”

The Toyota Camry is a mainstream midsize sedan known for being practical and widely used as a daily driver. It’s mentioned here as a contrast point against faster cars, highlighting how different vehicles can be in the same conversation about driving culture.

The BMW M3 is a performance-focused version of the 3 Series, built by BMW’s M division for high-revving, driver-focused handling. In 1995, the M3 is the E36-generation, and it’s notable here because the host is dealing with California emissions testing to keep it street-legal.

“California smog” refers to the state’s emissions testing program that checks whether a vehicle is producing acceptable levels of pollutants. For older cars, passing can require the engine and emissions equipment to be in very good working order, even if the car is otherwise stock.

In emissions testing, a “roller” usually means a dynamometer setup where the car’s wheels are driven while the vehicle remains stationary. This allows repeatable load and speed conditions so emissions can be measured consistently.

Oxygen sensors (often called O2 sensors) measure how much oxygen is left in the exhaust. That feedback helps the engine control fuel mixture (air-fuel ratio), which directly affects emissions and how easily a car can pass an emissions test.

“Cats” is shorthand for catalytic converters, which use chemical reactions to reduce harmful exhaust gases. If the catalytic converter isn’t working properly—or if the system isn’t calibrated correctly—emissions testing can fail even when the car otherwise runs well.

Fuel injectors deliver gasoline (or other fuel) into the engine in precise amounts and timing. If injectors are worn, clogged, or not delivering correctly, the air-fuel mixture can drift and emissions can rise—making emissions testing harder to pass.

The 1997 Toyota Supra is a legendary late-90s performance coupe, and the “twin turbo” setup means it uses two turbochargers to boost power. That twin-turbo system is part of why the Supra became a motorsports and tuner icon in the 1990s.

A blow-off valve is a turbo-related pressure-release valve that vents excess boost pressure when the throttle closes. On many turbo cars, it helps prevent compressor surge and can produce the characteristic “pssh” sound people associate with turbo setups.

“Eight pillar gauges” refers to a gauge setup mounted in the A-pillar/B-pillar area (often via pods) to monitor multiple engine parameters at a glance. Enthusiasts commonly add gauges like boost, air-fuel ratio, and oil temperature/pressure to keep track of how a turbo car is performing under load.

SEMA (Specialty Equipment Market Association) is a trade association representing the specialty automotive parts industry. In the episode, it’s described as doing government affairs and advocacy for member companies, with its biggest annual event being a major trade show in Las Vegas.

The “trade show in Las Vegas in November” refers to SEMA’s annual specialty-equipment industry event. It’s a key industry gathering where aftermarket brands and suppliers showcase products and network.

OBD2 (On-Board Diagnostics, second generation) is a standardized system that lets mechanics read a car’s stored fault codes and live sensor data. Plugging into the OBD2 port is a quick way to check modern cars, but older vehicles may need different testing methods.

A comprehensive test is a more involved emissions/diagnostic procedure than a quick scan, often required for older vehicles that don’t communicate the same way as modern cars. The idea here is that older cars may need harder-to-find test stations and more time to evaluate properly.

Catalytic converters are emissions-control devices that convert harmful exhaust gases into less harmful ones using catalysts. In the context of emissions testing, changing or upgrading catalytic converters can affect whether a vehicle passes smog requirements.

A smog pump (often part of an emissions system) injects air into the exhaust to help oxidize pollutants, especially during warm-up. In older California emissions setups, the required hardware can be specific, so swapping engines or exhaust parts may require reinstalling the smog pump to pass inspection.

Thermal reactors are older emissions-control devices used on some vehicles to reduce pollutants by using heat to promote chemical reactions in the exhaust. They’re mentioned here as part of the historical emissions hardware that can complicate engine swaps and compliance.

An emissions sheet is documentation showing a vehicle’s measured emissions results (often from certification testing). The episode notes a scenario where a car can be numerically “clean” on paper but still fail because it doesn’t meet required visual/installed equipment criteria.

A rolling cutoff is an emissions-rule exemption threshold that updates over time (for example, based on the vehicle’s age as the years pass). The hosts contrast it with a hard deadline, arguing that rolling cutoffs are more practical than fixed dates for determining which vehicles qualify for less strict rules.

A historic vehicle cutoff is the specific age/date threshold a state uses to classify a vehicle as “historic,” which can change how strictly it must meet emissions requirements. The segment describes Maryland trying to change this cutoff from a rolling 20 years to a fixed year (1999), and how that sparked controversy before being adjusted again.

“Leno’s Law” is the nickname for California SB 1392, a piece of legislation discussed in the episode. The hosts frame it as an issue the SEMA community has been pushing for, and they describe how it gained attention through high-profile car people and legislative allies.

SB 1392 is a specific California state bill number. In this episode it’s discussed as the legislation commonly referred to as “Leno’s Law,” and the hosts explain how it moved through the political process.

The “Bureau of Automotive Repair” (BAR) is a state agency that oversees vehicle emissions testing and related programs. In this segment, it’s mentioned as the authority that provides oversight to ensure smog equipment and processes are working properly.

The Porsche 911 is a long-running sports car line known for its rear-mounted flat-six engine and classic silhouette. In this segment, the host uses a late-1980s 911 ("87 Carrera") as an example of a car that would be affected by smog rules and emissions testing.

DMV stands for Department of Motor Vehicles, the government agency that handles vehicle registration and licensing. In the context of emissions programs, the DMV is often the place where fees, exemptions, or compliance steps are processed.

Diagnostic trouble codes are specific error identifiers stored by the car’s OBD-II system when it detects a fault. For emissions testing, the presence (or absence) of certain codes can indicate whether the car’s systems are functioning correctly.

Tailpipes are the exhaust outlets of a vehicle. In emissions testing, “looking at tailpipes” usually means measuring exhaust gases directly, as opposed to using OBD-II scan results.

A “25-year rolling” emissions policy means the exemption or reduced testing window advances each year so that cars become eligible once they reach about 25 years old. The idea is to treat older vehicles differently because they’re less likely to be driven frequently and may be maintained as collector or hobby cars.

Rust is corrosion of metal, and in car policy discussions it matters because it affects whether older cars survive and remain roadworthy. The speaker contrasts regions where rust is common versus places where older cars can last longer.

The hosts discuss a California law from 2003 that requires replacement tires to match the rolling-resistance efficiency of the tires that came with the vehicle. The goal is to preserve the fuel-economy assumptions used when the vehicle was certified.

OEMs means “original equipment manufacturers”—the companies that build the vehicle and specify the parts it comes with. In this context, OEMs certify fuel-efficiency performance using the tires that are part of the vehicle’s setup.

The Honda Civic is a widely sold compact car that often comes in multiple trim packages, and those trims can be paired with different tire types. In this discussion, it’s used as an example of how tire choice can vary by configuration.

A summer tire is designed to work best in warm weather, using rubber compounds and tread patterns optimized for dry and wet grip at higher temperatures. They generally lose traction in cold conditions compared with all-season or winter tires.

Rolling resistance coefficient is a number that describes how much energy a tire needs to keep rolling. Lower rolling resistance usually improves fuel economy, while higher rolling resistance can increase fuel use.

The McLaren F1 is a landmark supercar known for its mid-engine layout and the fact that it was built around extreme driver-focused performance. It’s famous for its three-seat cockpit (driver in the center) and its reputation as one of the most iconic “supercars of the 1990s” ever made.

The Mercedes-Benz 600 is a luxury flagship from the 1960s/early 1970s era, known for its large, powerful V8 and high-end comfort. It’s also a common base for long-wheelbase and heavily modified “statement” builds, including limo-style conversions.

A “compressor” here refers to a supercharger—an engine-driven forced-induction system that increases air pressure going into the engine. Calling it a “super 600” suggests the Mercedes-Benz 600 has been modified to make it more powerful than stock using forced induction.