It's speculated on the internet that a DOHC engine can't possibly see gains from the Pulstar plugs because of where it is in the chamber. On these engines the plug is usually positioned directly in the center of the chamber with two intake valves on one side and two exhaust valves on the other. The 2.5L Nissan 16-valve 4-cylinder happens to be the engine in the car we tested today.
With stock plugs installed the 2.5 put down 189 HP at 5900 rpm and 197 Ft-Lb at 3800 rpm. The acceleration test came out to 7.99 seconds to 80 mph from 40 mph over a distance of 0.14 miles and consumed 1081.49 cc on the fuel economy run.
Pulstar plugs DG-1 installed at .044" gap the engine made 195 HP at 5900 rpm and 203 Ft-Lb at 3800 rpm. Acceleration from 40 to 80 took 7.95 seconds and took 0.13 miles while the fuel economy test yielded 1039.85 cc of fuel usage.
This comes out to a power increase of 6 HP (3.2%) and 6 Ft-Lb (3.0%) and a fuel savings of 41.64 cc (3.9%) versus stock. The acceleration didn't quite give us much of a result, at a difference of a mere .04 seconds (.5%) but it is a positive result nonetheless.
These are good gains and about what you can expect to see from a typical after market bolt on that isn't FI (Forced Induction). For only about $112 you'd be hard pressed to even find a cold air intake that you could bolt onto this, or any, engine.
www.pulstar.com
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