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Catalog #71003
Brochure #63-0261
©2004 Edelbrock Corporation
Rev. 3/04 - DC/mc
Page 6 of 22
1.2 Jet Map Information
Edelbrock Engineering has conducted dyno testing with the Edelbrock 2002-2004 Subaru WRX Nitrous System to
ensure the horsepower increase with the nitrous system is as intended. On a typically stock 2.0L engine, you can
expect the following approximate power gain:
Nitrous Jetting
Fuel Jetting Approx. HP Gain
.034 .020 50hp
On an engine of greater displacement, horsepower gains may be slightly different.
1.3 Engine Operation Considerations
When used correctly, nitrous oxide safely elevates cylinder pressures and temperatures while increasing
combustion rate. These characteristics make the engine more sensitive to detonation. To ensure proper
performance, engine and drive line life, the following tips are suggested:
• System Jetting
Never exceed the recommended jetting!! Excessive jetting can result in severe engine damage.
• Fuel Quality
Because Nitrous oxide is an oxidizer, fuel selection is critical. Both octane and fuel consistency affect fuel burn rate.
The oxidizer quality of nitrous oxide will accelerate the burn rate, so we recommend a high quality of gasoline. We
also recommend you use the same grade of gasoline every time you use your nitrous oxide system. This will help
maintain the same fuel burn rate every time.
• Ignition Components
Most aftermarket performance chips increase the vehicle’s ignition timing, which can cause detonation with the use
of nitrous oxide. Please consult with your chip manufacturer on information regarding the compatibility of your chip
with nitrous oxide use.
If your vehicle is equipped with platinum type spark plugs, we highly recommend they be removed and replaced
with the equivalent standard type spark plug.
• Engine System Upgrades
With all performance modifications, complementary system upgrades will always serve to elevate the consistency
and longevity of an engine, especially when using nitrous oxide as a power adder. Modifications such as ignition
upgrades, free-flowing exhaust, camshafts, cylinder heads, manifolds can all add to the performance of a nitrous
oxide injected engine.