AEM Plug & Play Programmable EMS
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AEM Plug & Play Programmable EMS
http://www.hondatuningmagazine.com/a...2_tech01.shtml
I've included small portions of the article to generate interest. Very cool article.
The art of fine-tuning an engine computer is viewed as one of the blackest in the aftermarket
Our test car already had the PEMS installed, so our goal was to further tune it and turn up the boost.
Our first pull netted us a healthy 260 horsepower at the wheels. However, the car was unexpectedly running dangerously lean (more than 15:1) as boost built up to its maximum 11 pounds
Siebels hooked up the laptop and went to work. He uploaded the ECU's current state to the laptop, and opened up the fuel map graph. But instead of manually renumbering each cell on the table by hand, he simply clicked on the edge of the graph and dragged it higher, thus telling the computer to add more fuel at that range. He did this at several points along the graph. Then the magic of the software came into play. Siebels did not need to adjust the rest of the table--or even the graph--by hand. Instead, he simply selected an area and commanded the software to "smooth" out the graph for all the points selected. The whole procedure took about a minute. For other systems, that would have been a solid half hour of work.
The car was fired up, and Siebels laid down another dyno pull. Still lean, but better. A few more tries showed the big injectors were nearing the limit of their duty cycle, which by all logic should have been flooding the cylinders with gas. Clearly there was a problem with fuel delivery, and a quick glance under the hood discovered that the power lead for the secondary fuel pump (supposed to come on at 3000 rpm) had come loose. The fuel map was returned to the original settings via the "undo" button, and tuning started from scratch. This particular problem was detected, diagnosed, and fixed within about a 30-minute span.
This time, the engine was much happier, and had plenty of gas. So the boost was turned up (in this case, through an external boost controller). After a couple of steps, the boost was comfortably raised from 11 pounds to 13. Fuel was increased appropriately, and a solid 12.5:1 ratio was shown through the full pass. At this point, the car was just breaching 300 hp at the wheels.
I've included small portions of the article to generate interest. Very cool article.
The art of fine-tuning an engine computer is viewed as one of the blackest in the aftermarket
Our test car already had the PEMS installed, so our goal was to further tune it and turn up the boost.
Our first pull netted us a healthy 260 horsepower at the wheels. However, the car was unexpectedly running dangerously lean (more than 15:1) as boost built up to its maximum 11 pounds
Siebels hooked up the laptop and went to work. He uploaded the ECU's current state to the laptop, and opened up the fuel map graph. But instead of manually renumbering each cell on the table by hand, he simply clicked on the edge of the graph and dragged it higher, thus telling the computer to add more fuel at that range. He did this at several points along the graph. Then the magic of the software came into play. Siebels did not need to adjust the rest of the table--or even the graph--by hand. Instead, he simply selected an area and commanded the software to "smooth" out the graph for all the points selected. The whole procedure took about a minute. For other systems, that would have been a solid half hour of work.
The car was fired up, and Siebels laid down another dyno pull. Still lean, but better. A few more tries showed the big injectors were nearing the limit of their duty cycle, which by all logic should have been flooding the cylinders with gas. Clearly there was a problem with fuel delivery, and a quick glance under the hood discovered that the power lead for the secondary fuel pump (supposed to come on at 3000 rpm) had come loose. The fuel map was returned to the original settings via the "undo" button, and tuning started from scratch. This particular problem was detected, diagnosed, and fixed within about a 30-minute span.
This time, the engine was much happier, and had plenty of gas. So the boost was turned up (in this case, through an external boost controller). After a couple of steps, the boost was comfortably raised from 11 pounds to 13. Fuel was increased appropriately, and a solid 12.5:1 ratio was shown through the full pass. At this point, the car was just breaching 300 hp at the wheels.
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