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artzzr

3L RUNNING RICH

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hi

having completed the 3 l conversion first dyno run shows engine running too rich and really rich over 4000 revs, still running the beige injectors and st24 maf , ecu etc

have noticed on the cougar forum , dyno print outs on 3l conversions having the same richness

why is this when the 3 l is drawing much more air, and can a remap correct this

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You MUST reprogram the ECU after an engine swap. Despite what anyone says, there is no perfect combination of 2.5L parts that will make a 3L engine swap run correctly without reprogramming. Some have found the secret sauce which allows the engine to run without triggering the CEL, but it's not a perfect tune. The ECU is designed to operate within a very narrow margin to keep emissions in check. It's designed to provide the correct fuel/air mixture for the 2.5L and only the 2.5L (assuming it's not a 2.0L). The ECU cannot "learn" beyond what is programmed.

 

Get it tuned or don't bother driving the car. You'll only damage the catalytic converters, foul the plugs, and waste fuel. A remap with a rolling road and wide band O2 sensor data is the best method. The programming will be specific to your setup, and not some generic "one size fits all" tune.

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What exactly do people mean when they say "tune" or "reprogram the ECU" ? Where can this be done and what type of equipment does it take ?

 

thanks,

 

Mad Dog

 

"Tune" is used to describe the fuel map program or the act of reprogramming the fuel map. Reprogramming the ECU (engine control unit, aka PCM (powertrain control module (automatic trans)) or ECM (engine control module) requires specialized equipment. "Tuners" can refer to the person performing the reprogram or the physical reprogramming device.

 

Specialized automotive performance dealers may have the equipment to reprogram your car's ECU. The most popular brand for Fords is SCT. SCT dealers can sell you a preprogrammed flash tuning device that you connect to your car's OBD II port. The tuning device "reflashes" the ECU's stored program to adjust for performance modifications. The preprogrammed devices are great for mild bolt ons (air intake, exhaust) but are limited when the modifications are more extreme (engine swap). The best method of reprogramming is to take the car to a shop that offers reprogramming with a chassis dynamometer (dyno, rolling road). The dyno enables the tuner to run the car under real world driving and race track conditions in a safe controlled environment. The tuner can put the engine under a load and tune for specific modifications instead of generic modifications.

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Spridget has it handled :thumbs:

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