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The Terminator
Engine/Tuning
Which Tuning Parameters to Datalog?
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<blockquote data-quote="mofasta" data-source="post: 7889291" data-attributes="member: 71110"><p>Start the vehicle. Click on the “Graph” Icon and open the various “trees” to check the following PIDs (datalog items): RPM, MAF AD counts, Short Term Trim 1, Short Term Trim 2, Load, Idle air integrator, ISC duty cycle, battery voltage, fuel source, spark source. On returnless fuel vehicles (’99 and up Mustangs) also choose fuel pump duty cycle, pressure drop across injectors. On Blown Mustangs and Lightnings also choose Intake air temp or downstream intake air temp or IAT temp. They may be in a different order and may be labeled slightly different.along with your a/f reading.</p><p>For the first tests record A/F at idle, 1500, 2000, 2500, 3000 and 3500 RPMs just free revving the motor. When you first start it, wait 2 minutes before taking the first idle readings – then rev to 1500, wait about 10 seconds and record the readings, etc. If the readings sometimes jump around, just give a rough average of what they are. Record below – note Target A/F is 14.64 – so in this mode really anything from about 14.4-15.2 is OK, since the 02 sensors will pull it into tolerance when they are turned on:</p><p></p><p></p><p>“0” Tune</p><p></p><p>RPMs Air to Fuel MAF Volts </p><p></p><p>Idle </p><p></p><p>1500 </p><p></p><p>2000 </p><p></p><p>2500 </p><p></p><p>3000 </p><p></p><p>3500 </p><p></p><p> </p><p></p><p>“1” Tune</p><p></p><p>RPMs Air to Fuel MAF Volts </p><p></p><p>Idle </p><p></p><p>1500 </p><p></p><p>2000 </p><p></p><p>2500 </p><p></p><p>3000 </p><p></p><p>3500 </p><p></p><p> </p><p></p><p>“2” Tune</p><p></p><p>RPMs Air to Fuel MAF Volts </p><p></p><p>Idle </p><p></p><p>1500 </p><p></p><p>2000 </p><p></p><p>2500 </p><p></p><p>3000 </p><p></p><p>3500 </p><p></p><p> </p><p></p><p>“3” Tune</p><p></p><p>RPMs Air to Fuel MAF Volts </p><p></p><p>Idle </p><p></p><p>1500 </p><p></p><p>2000 </p><p></p><p>2500 </p><p></p><p>3000 </p><p></p><p>3500 </p><p></p><p> If any of the tunes are close to 14.64 at all positions, you can start WOT runs. </p><p></p><p>Wide open throttle – this is best done on a dyno. But if you have a long deserted stretch of highway and a friend in the car and you will not exceed the speed limit or be unsafe, you can do it on the street. Do either third or fourth (in a 5 speed – 2-3 in an auto) gear runs, start at 2500 or so, don’t let the engine lug though. The target A/F at WOT is 11.5:1. Stop the run if the A/F goes leaner than 12.3-12-4:1 this can cause engine damage. It may be lean at the beginning of the run while the fuel transitions to open loop, this is OK, but by about 3500, it should transition. Stop it if it goes lean up top too. STOP the run if you hear ping or detonation. The tune assumes 10* base and 39.5 fuel pressure (stock). in the meantime, take 2-3* out of the distributor.</p><p></p><p></p><p></p><p>mofasta</p></blockquote><p></p>
[QUOTE="mofasta, post: 7889291, member: 71110"] Start the vehicle. Click on the “Graph” Icon and open the various “trees” to check the following PIDs (datalog items): RPM, MAF AD counts, Short Term Trim 1, Short Term Trim 2, Load, Idle air integrator, ISC duty cycle, battery voltage, fuel source, spark source. On returnless fuel vehicles (’99 and up Mustangs) also choose fuel pump duty cycle, pressure drop across injectors. On Blown Mustangs and Lightnings also choose Intake air temp or downstream intake air temp or IAT temp. They may be in a different order and may be labeled slightly different.along with your a/f reading. For the first tests record A/F at idle, 1500, 2000, 2500, 3000 and 3500 RPMs just free revving the motor. When you first start it, wait 2 minutes before taking the first idle readings – then rev to 1500, wait about 10 seconds and record the readings, etc. If the readings sometimes jump around, just give a rough average of what they are. Record below – note Target A/F is 14.64 – so in this mode really anything from about 14.4-15.2 is OK, since the 02 sensors will pull it into tolerance when they are turned on: “0” Tune RPMs Air to Fuel MAF Volts Idle 1500 2000 2500 3000 3500 “1” Tune RPMs Air to Fuel MAF Volts Idle 1500 2000 2500 3000 3500 “2” Tune RPMs Air to Fuel MAF Volts Idle 1500 2000 2500 3000 3500 “3” Tune RPMs Air to Fuel MAF Volts Idle 1500 2000 2500 3000 3500 If any of the tunes are close to 14.64 at all positions, you can start WOT runs. Wide open throttle – this is best done on a dyno. But if you have a long deserted stretch of highway and a friend in the car and you will not exceed the speed limit or be unsafe, you can do it on the street. Do either third or fourth (in a 5 speed – 2-3 in an auto) gear runs, start at 2500 or so, don’t let the engine lug though. The target A/F at WOT is 11.5:1. Stop the run if the A/F goes leaner than 12.3-12-4:1 this can cause engine damage. It may be lean at the beginning of the run while the fuel transitions to open loop, this is OK, but by about 3500, it should transition. Stop it if it goes lean up top too. STOP the run if you hear ping or detonation. The tune assumes 10* base and 39.5 fuel pressure (stock). in the meantime, take 2-3* out of the distributor. mofasta [/QUOTE]
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Which Tuning Parameters to Datalog?
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