Dodge Neon SRT4 Engine Fundamentals

The Dodge Neon SRT4 is tuned to fulfill certain requirements from the production line. Their particular aim when tuning your car isn't to maximise the engines power production but to average power figures and gas mileage as described in published specs. As you modify your car you should tune your engine so you actually benefit from the modification. Merely changing the wastegate or other component may cause high boost however your engine won't be performing at ideal levels.

 Your motor works harder when tuned for improved power. Improved power usually lowers fuel economy. Also, there are several stock components which will need to be changed considering they are not designed to endure stress a result of the boost in power. After the engine is tuned it will require regular routine maintenance and servicing that will maintain performance and reliability. Improved power generally will reduce gas mileage.

 Power output, fuel economy and dependability should be considered while tuning your vehicle. Each of these is as important as the other. It would be a mistake to turn your car to realize optimum power production but also greatly reduce your fuel economy to an unwanted level and puts a great deal of stress on the components that you end up investing a lot of money just keeping it running. So, tune the engine to achieve a compromise between power output, gas mileage and dependability.

 SRT4 Tuning

 The engine is controlled by the computer (PCM). The PCM is often a complex computer system used to set how you want each component to perform and tracks variables such as air flow, air temperature, oxygen within the exhaust, throttle position and engine load. Altering your PCM tune is known as remapping. When you remap your ECU you're reprogramming how the computer operates the wastegate and fueling which in turn affects how much fuel/air that is burnt.

 Canned remaps can be obtained but will only contribute to minimal changes in power production, gas mileage and dependability. A customized remap is specific towards the specific engine and typically achieves the greatest results. Modifications to engine components requires a custom remap to truly realize noteworthy improvements. It ought to be mentioned by using most of todays tuners you are able to save and use different tunes for different conditions and applications with minimum effort and time.

 Wastegate

 The cars engine exhaust spins the turbo forcing air in to the intake which results in more exhaust turning the turbo more rapidly. Without controlling the boost level this closed loop system would keep producing greater pressures till the engine failed. As a result, the wastegate releases boost pressure whenever a established pressure level is attained.

 One issue using the wastegate is it operates by a spring. As soon as the boost pressure approaches the maximum that can be held through the spring the wastegate starts to open (creeps) and thus releasing pressure. As a result, there's a slight reducing of boost prior to the precise boost level is reached. Consequently, a boost controller is used to combat the premature release of boost pressure built in while using wastegate.

 Fuelling

 Components involved in fueling are the fuel pump(s), injectors, fuel pressure regulator and fuel filter. The correct air to fuel mixture is critical for maintaining power output and reliability of the engine. To rich or to lean fuel mixture will lower power production and can cause severe problems with reliability. The additional power you're achieving the more essential the air to fuel mixture will become.

 Blow Off Valve (BOV)

 When your turbocharged engine spools up, it pressurizes the intake system, that forces additional air into the combustion chamber. After you take your foot off the accelerator, that pressure stops instantly and the extra pressure is quickly released by the BOV. Without a BOV the pressure would change course and return back in the intake system, creating undue force on the turbocharger's components. This kind of pressure return will also limit the velocity of the compressor wheel, which means it will take much longer to spool up again once the throttle is opened.