Modifications

ChipExpress.com

Discovery 5 3.0 Td6 Common Rail Diesel Engine

** THIS CHIP DOES NOT WORK! IT WAS DETERMINED TO HAVE NO INCREASE IN HORSEPOWER OR TORQUE AND REDUCED THE FUEL MILEAGE. **

(no chip is available for gas engines)

https://www.chipexpress.com/products/land-rover/discovery/diesel-chip-tuning-boxes/5609/

Stock Engine = 254 Hp

Chipped Engine = 325 Hp (V6 Gas Engine 340 Hp)

+ 71 Horsepower

Stock Engine = 443 lb/ft Torque

Chipped Engine = 572 lb/ft Torque (V6 Gas Engine 332 lb/ft Torque)

+ 129 lb/ft Torque

More Fuel Economy

Stock Engine = 28 mpg highway

Chipped Engine = 33 mpg highway

+5 mpg

More Top Speed

Stock Engine = 130 mph

Chipped Engine = 136.5 mph

+6.5 mph

How does it work and is it safe?

Here is what I believe to be the case. Manufactures have to make modern diesel engines run rich to lower combustion temperatures in order to reduce NoX emissions mandated by the government. By leaning up the air/fuel mixture you can actually run the engine much more efficiently, substantially increasing power, fuel economy and reducing carbon and soot deposits, however you will emit higher level of NoX particles into the environment. Keep in mind though that the NoX output is still going to be less than full-size diesel truck engines which are legal, they just have less stringent requirements to meet. This is what Volkswagen got in trouble doing on their diesel car engines, they used rich mode for vehicle testing, which lowered fuel mileage, power and NoX emissions but then reverted back to lean mode for regular driving, increasing fuel mileage, power and NoX emissions.