Dodge Owner Shares Easy Tuning Process Behind Stock Viper’s Power Upgrade

Long before they were Stellantis North America, Fiat-Chrysler, or even DaimlerChrysler, the Chrysler Corporation had visions of ten pistons dancing around under the hood of a compact sports car. In 1988 Bob Lutz pushed for these visions to be realized and just four years later Chrysler unveiled their first ever 10-cylinder car, the cleverness viper.

The Dodge Viper has been a popular speed icon for car enthusiasts for decades, but it’s rather difficult to categorize it. To call it a sports car almost undermines its capabilities, but the handling is much better than any other muscle car. Since the price of a Dodge Viper is about twice that of the Dodge Challenger, you can safely call this a supercar, and it is, in fact, super.

Automotive YouTuber Four Eyes takes this incredibly clean 2000 Dodge Viper GTS to the test bench to see how “super” he can make this car in its standard form, without damaging the original engine.

Four Eyes is not your typical YouTuber on the dyno. He explains accurately and simply his process to achieve this impressive power gain, while also imparting some additional knowledge of the engine and how dyno tuning works.

In this video, Four Eyes takes its 2000 Dodge Viper GTS to the dyno at Street to Sand Offroad in Reno, Nevada, to really run its stock V10. Although their name suggests that they only specialize in all-terrain vehicles, that is far from the truth. Street to Sand Offroad tunes and builds incredible cars, from Ferraris to Camaros. They can even trade LS3 with your grandma’s Buick.

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20-year-old Dodge Viper GTS looks immaculate

Seeing this particular 2000 Dodge Viper GTS driving down the road is sure to turn some heads. If the paint was all this car needed, that alone would be enough. This immaculate 20 year old car is as immaculate inside as it is outside. With only 38,000 miles on it, it’s obvious that this car has been incredibly well-maintained.

“It’s in much the same condition as when it rolled off the assembly line over 20 years ago,” explains Four Eyes. “The engine is completely unchanged, the interior is all original and it still has its strangely quiet stock exhaust. It even had a set of 22 year old tires when I picked it up earlier this year.”

Air-fuel ratio and timing equals performance gain

For the baseline run, the Viper’s 8.0-liter V10 delivered 410 horsepower and 450 ft-lb of torque to the wheels. But since the car seemed to run rich from 3,500 to 5,000 rpm, Four Eyes knew there were some changes it could make to get even more power.

Adjustments to the fuel table drastically improved the air-fuel ratio around 4,000 rpm, adding 2 horsepower and 7 lb-ft of torque, but it still ran rich after 4,500 rpm. Minor adjustments to the fuel table resulted in the second tune with an even power gain. With the Viper now pumping out 418 horsepower and the fuel table finely stitched, it was time for Four Eyes to focus on timing.

For the third tune, he moved the timing forward 3 degrees and left the fuel table alone to see its effects. Raising the timing alone produced an extra 10 horsepower, bringing it up to 428 horsepower. A few more minor tweaks to the AFR and timing resulted in a slight gain, but the car ran lean pretty consistently throughout the run. One final tweak across the entire fuel table did the trick. On its best run, this 2000 Dodge Viper GTS was able to squeeze out 438 horsepower and 483 lb-ft of torque. This is a total performance gain of 28 horsepower and 33 lb-ft of torque, just after some dyno tuning.

The correct adjustments to the AFR and timing resulted in a 6.8% increase in horsepower and a 7.5% increase in torque for this 2000 Dodge Viper GTS.

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Acceleration test: 30-80 MPH

After a successful fifth tune, Four Eyes didn’t want to risk putting any more strain on this stock engine and decided to end its day of tuning on a high note.

Before he got to the dyno, he set an acceleration time of 30-80 mph on the base. On a standard tune, the Viper raced over a long, empty stretch of road and was able to complete this acceleration test of 30-80 mph in 5.93 seconds.

After his significant power gains at the dyno, this 20-year-old Dodge Viper GTS took to the streets again to give this acceleration test another try. During the post-tuning acceleration test, the Dodge Viper GTS was able to complete its 30 to 80 mph drive in just 5.53 seconds. This really shows how much proper tuning can affect a vehicle’s performance.

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