An engine parameter adjustment is made to a stock Viper.
This video addresses the question of how much tuning a naturally-aspirated vehicle can cost. The dyno is used to check adjustments to the air-fuel ratio, ignition timing, and other factors. This test was performed on a stock 2000 Dodge Viper that has only 38,000 miles (61.155 kilometers).
First, get a baseline output from the dyno. Next, check the air-fuel ratio throughout the rev range. This 8.0-liter V10 is rated at 450 horsepower (336 Kilowatts) as well as 490 pound-feet (664 Newton-meters), of torque at the crank. This engine produces 410 horsepower (306 kW) at the wheels and 450 lbft (610 Nm). This is a remarkable result for a car that’s only 20 years old.
The Viper runs rich in the middle range of the rev range. Therefore, the tuner reduces air-fuel ratio. A second test with the dyno shows that the Viper now produces 412 horsepower (307 kW) as well as 457 lb.ft (620Nm).
The tuner will continue to adjust the air-fuel ratio until it is perfect. He then adjusts the ignition timing. The dyno now shows that the engine produces 435 horsepower (324 kW) as well as 475 lb/ft (644 Nm). The timing adjustment causes the mill’s to run lean. Therefore, it is necessary to adjust the air-fuel ratio.
The dyno now shows that the engine produces 438 horsepower (327 kW) as well as 483 lbft (655 Nm), at the wheels (see graph). The powerplant now produces 6.8% more horsepower and 7.3% more torque than its stock counterpart. This is the tuner’s opinion on how safe it is to run safely on pump gas.
This change results in acceleration of 30 mph to 80 miles per hour in second gear. It takes 5.93 seconds to accelerate in stock form, and 5.53 seconds to accelerate with engine parameter tweaks.