Diesel power works because torque and airflow matter more than people think. On the race side, a production-based 6.6L Duramax is pushed into the 1,300-horsepower range with twin turbos, Ram-Air ducting, and staged nitrous. The nitrous is doing double duty there, adding power and pulling charge temperature down so the engine can live at high boost. That combination is enough to push the Sidewinder S-10 to a 7.77-second pass at 180 mph. On the street side, the same logic applies in a much more usable package. The 2009 Jetta TDI responds to reduced intake restriction, tuning, and exhaust work because the real gain is in the torque curve and engine breathing. Our Banks Ram-Air Intake System cuts inlet restriction, supports the turbo better, and helps the little 2.0L diesel act bigger than it is. The result is a car that stays efficient, pulls hard, and does it without tearing into the engine.
In the parking lot, Gale Banks walked through a diesel drag truck built strictly for quarter-mile use. The truck is powered by a 6.6-liter, 403-cubic-inch Duramax V8 diesel of the same basic family used in pickup trucks, TopKick, and Kodiak medium-duty trucks. It retains aluminum heads as in production form, but Banks noted that the engine is roughly 100 to 150 pounds heavier than a big-block Chevrolet. In its current state of tune, this version makes about 1,320 horsepower, while the related engine in Banks' rear-engine dragster is already in the high-1300-horsepower range.
The engine operates in the high-30 to low-40 PSI boost range and also uses multiple stages of nitrous oxide. Despite the output, Banks emphasized the engine's remarkable fuel efficiency. During a day of running, the truck uses only about one gallon of diesel fuel, which he described as the most fuel-efficient engine he has ever had on a dyno in 51 years of testing. He clarified that the quoted power is flywheel horsepower, with roughly 75 horsepower lost through the driveline before reaching the tires.
Banks characterized the 400-cubic-inch Duramax as a big-block in physical scale as well as displacement. The engine turns about 5,800 RPM, which is extremely high for a diesel. In burnouts it will reach 5,800 RPM, while shift points during a pass are typically around 5,600 to 5,700 RPM. By comparison, the same engine in a pickup truck normally turns only about 3,200 RPM. That contrast underscored how aggressively the race engine is being spun. Banks also pointed out the diesel advantage in torque production: compared with a gasoline engine, the diesel's stronger low-speed torque allows relatively small-displacement engines to launch heavier vehicles effectively.
Visually, the engine features large intake plenums and upward-facing headers feeding twin turbochargers, giving it an appearance similar to one of Banks' marine engines. Banks said the layout is indeed close to his marine-engine configurations. Air is taken from the nose of the truck through a ducting system with hose couplings, creating a strong Ram-Air effect. As vehicle speed increases, that inlet pressure helps the turbo compressors, which Banks described as a poor man's supercharge.
The truck runs around 40 pounds of boost before nitrous is added. Rather than using a conventional intercooler, the system relies on nitrous oxide for charge cooling. A pass consumes roughly 7 to 8 pounds of nitrous. Banks said thermal couples are installed throughout the system to verify intake-air temperature, and his target is a maximum of 125 degrees Fahrenheit entering the engine. At the time of the discussion, the measured temperature was about 150 to 152 degrees Fahrenheit, somewhat above his goal, so he planned to add another stage of nitrous to improve cooling.
Banks stated that this truck was, at the time, the quickest and fastest diesel quarter-mile vehicle in the United States and, by extension, the world. Its record was a 7.77-second pass at 180 mph, achieved by this very vehicle. He contrasted that with the team's dragster, which was still in earlier development and running in the 9-second range and low 8s.
The dragster uses a 5-speed transmission, and Banks explained that they had only run it through fourth gear so far. It had not yet completed a full pass, indicating that the combination still had substantial development left. The broader point was that Banks' diesel racing work spans multiple formats, from quarter-mile vehicles to marine engines and land-speed efforts, with the same engineering mindset applied across them.
Banks reflected on his long involvement in motorsports and noted that drag racing had never been his primary focus, even though he had spent enough time around NHRA competition to push the organization into banning certain approaches. He said turbocharging was not allowed in Top Fuel and Funny Car, and that he had also seen turbocharging banned in offshore competition.
When asked why turbochargers were prohibited in Top Fuel while superchargers remained legal, Banks said he believed regulators considered turbo systems too difficult to police consistently. The exchange highlighted a recurring theme in Banks' career: he often pursued technically effective turbocharged solutions that challenged established racing norms and rule structures.
The conversation then shifted from race vehicles to a Volkswagen Jetta TDI wagon, which Banks presented as an example of efficient, usable diesel performance. The car uses a 2.0-liter turbo diesel four-cylinder and a 6-speed dual-clutch transmission. Banks praised the gearbox as road-racing-grade hardware in an inexpensive production car, noting that it shifts in 100 milliseconds or less.
He illustrated the car's efficiency with a real-world trip: after picking it up in Huntington Beach, he drove around Pasadena for three days, then up to Yosemite where he was building a house, drove around there for three more days, and finally returned to Bakersfield. When he refueled, the car took only 14.3 gallons. Banks estimated the tank capacity at roughly 17 to 18 gallons, meaning there were still 2 to 3 gallons left in reserve. The route included mountain driving as well as sustained 80 mph cruising on Highway 99 between Bakersfield and Fresno. Even under those conditions, the car delivered more than 600 miles on that fuel load.
Banks said the Jetta had also received a handling package. Normally his setup lowers the car about an inch, but this particular car sat slightly higher because he was taking it into the mountains and wanted some additional clearance. Even so, he described it as highly capable on winding roads, especially when accelerating out of corners with the dual-clutch transmission.
He also remarked that the car's performance often surprised other drivers. The point was not outright exotic-car speed, but the mismatch between expectations and actual capability: a diesel wagon driven by a man in his late 60s could move quickly enough to embarrass younger drivers in sportier-looking machinery. That anecdotal point reinforced Banks' larger argument that diesel torque and efficient drivetrains can make ordinary vehicles unexpectedly effective in real-world driving.
Under the hood, Banks described a straightforward package of upgrades rather than invasive engine work. The Jetta uses a front-wheel-drive, side-mounted inline-four layout, and he noted that torque steer was minimal. The hardware package included a Banks Ram-Air cold-air intake system, which he said cut intake restriction in half. The engine remains a turbocharged 2.0-liter, 122-cubic-inch diesel.
Stock output was described as about 140 horsepower, and Banks said his tuning approach aimed for roughly a 20 percent improvement. More important to him than peak horsepower was the torque curve. In addition to the intake, the car had tuning electronics and exhaust work. Banks referred to the tuner as a Six-Gun unit and said the car also used a Banks iQ system inside. He described the iQ as essentially a PC mounted on the dash that runs his equipment and reports what the car is doing in real time.
A key part of the package is that the engine does not need to be opened. There is no need to drop the oil pan, remove the heads, or perform internal modifications. Banks tied that philosophy back to the durability of modern diesel engines. He added that on pickup-truck applications, customers commonly gain 150 to 170 horsepower and about 230 to 240 lb-ft of torque on a stock engine using Banks hardware and tuning.
Banks closed on a broader engineering point: he sees a future in smaller-displacement engines that produce substantial torque while maintaining respectable horsepower and strong efficiency. The Jetta TDI served as a practical example of that idea. A 2.0-liter turbo diesel with the right intake, exhaust, and tuning can deliver useful real-world performance without sacrificing range or requiring major engine disassembly.
Across both vehicles in the segment-the 1,300-plus-horsepower Duramax drag truck and the modified Jetta TDI wagon-the common thread was Banks' emphasis on air management, turbocharging, torque production, and efficient use of fuel. Whether the goal is a 7.77-second quarter-mile pass at 180 mph or a 600-plus-mile road trip on 14.3 gallons, the engineering story remains the same: maximize airflow, control temperature, exploit diesel torque, and build performance around durable production-based hardware.