How to Tune and Modify Automotive Engine Management Systems by Jeff Hartman

By Jeff Hartman

Figuring out gas injection and engine administration platforms is the main to extracting greater functionality from today’s autos in a secure, trustworthy, and driveable fashion.

Turbochargers, superchargers, nitrous oxide, excessive compression ratios, radical camshafts: all are identified to make horsepower, yet with no right figuring out and regulate of gasoline injection and different digital engine administration platforms, those renowned power-adders won't ever reside as much as their capability and, at worst, could cause pricey engine damage.

Drawing on a wealth of information and event and a heritage of greater than 1,000 journal articles at the topic, engine-control specialist Jeff Hartman explains every thing from the fundamentals of gasoline injection to the development of complicated undertaking automobiles. Hartman covers the newest advancements in fuel-injection and engine administration expertise utilized by way of either international and household brands, together with well known aftermarket systems.

No different publication out there covers the topic of engine administration structures from as many angles and as comprehensively as this book.

Through his non-stop journal writing, writer Jeff Hartman is usually updated with the most recent fuel-injection and engine administration items and structures.

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Extra resources for How to Tune and Modify Automotive Engine Management Systems

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EnrichmenT summAry Enrichment values stored in tables in ECU memory include choke enrichments, acceleration enrichments, and volumetric efficiency enrichments (or enleanments). Combined with engine displacement and peak VE, these values together define a fueling map for a certain engine. An EMS microcomputer sums all enrichment values to arrive at a total enrichment for the current fuel-injection event that is represented by G (for the Greek letter gamma). The total enrichment (or enleanment) is an offset from the theoretical (stoichiometric) air/fuel ratio based simply on air mass.

Typically, a first stage TPI or LT1 PROM would be designed to work well with a low-restriction air filter, a low-temperature thermostat, a throttle body air foil, MAF screen removal, and modified air filter housing. 7-liter TPI V-8. 6-second faster quarter mile with 2 miles per hour faster top end. It is very important to use the right PROM with lower-temperature thermostats (since the ECU could otherwise assume that the car is still warming up) and keep warm-up enrichment activated, which wastes fuel, cuts power, and wears out the cylinders fast from wetting down the cylinder walls.

As such, the sensor determines magnet position regardless of rotational speed and is less sensitive to variations in gap between the sensor and wheel. Timing scatter is greatly reduced, and timing variations with rpm are eliminated. Hall effect sensors normally have three wires usually for ground, output signal, and reference voltage (from the vehicle’s ECU, 5 or 12 volts). Like flying magnet pickups, Hall effect sensors make use of the interaction between a magnet and ferrous metal coming into close proximity.

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