WeathermanShawn
April 19th, 2011, 05:17 PM
In-Memory-of-Shawn-Sankey (http://forum.efilive.com/showthread.php?16849-In-Memory-of-Shawn-Sankey)
TUNERS CHECKLIST
1. General Checklist
□ On a cold start, just prior to starting, IAT and ECT should be very close, within a few degrees of each other
□ MAP should read same as barometric pressure
□ MAF should read zero airflow
□ Battery should be fully charged and functional
2. General Maintenance
□ Replace air and fuel filters annually
□ Check oil level and replace dirty oil
□ Clean MAF with approved electrical cleaner
□ Check PVC system
□ Ensure spark plugs and wires are operating normally
□ Check for manifold and exhaust leaks
□ Replace Narrowband O2 sensors at least every 60,000 miles
3. Injector Tuning
□ Ensure your injector data is accurate
□ Check fuel pressure and replace the fuel pump/wiring, if necessary
□ Ensure you have the correct IFR slope (sloped vs. flat) and that it matches the FPR (un-reference vs. referenced)
□ Check for fuel leaks anywhere, which this is a fire hazard
□ Any bad grounds, insufficient wire sizing, and/or poor connections will lead to fueling problems
4. Tuning/Mechanical Issues
□ Ensure you do not have excessive heat-soak. For more accurate readings and consistent fueling, IAT Sensor should be located away from heat sources (like the radiator or the engine itself)
□ Home-ported throttle body can be problematic
□ Ensure catalytic converter(s) is(are) not blocked or plugged
5. MAF & Other Sensors
Good NBO2 in closed loop (i.e. trimming properly) will show these characteristics during steady part throttle:
□ Swinging faster than two (2) complete cycles per second
□ Swinging above 600 mV and below 300 mV
□ Average voltage will be close to 450 mV
□ If they switch slower than three (3) cycles per second, the trimming will lag a little behind
□ If they switch without going above 600 mV or below 300 mV then a DTC will trigger
□ If the average mV deviates significantly from 450 mV then the trimming will be to some unpredictable AFR
□ MAF signal should not show jagged edges or rapid changes in airflow during cruise or WOT. Some oscillation is normal, but it should not exceed 5% per frame (1/10 sec)
□ Wideband Location is crucial. Tailpipe locations should be avoided. Follow the wideband manufacturer’s guidance as to the location and installation. Sensors should be calibrated regularly, including heater calibrations if necessary.
Example of normal operating Closed-loop Scan with Fresh O2 Sensors. (Long-Tube Header Location) Shows NB switching, steady MAF signal, and wideband oscillating normally around stoich AFR.
http://i1126.photobucket.com/albums/l609/weathermanshawn/HeaderHO2.png
Example of why you should NEVER use Stock NarrowBands for WOT Tuning Fresh NB O2's..AFR both 12.62.
1. IAT 90F MV: 872-890
http://i1126.photobucket.com/albums/l609/weathermanshawn/WOT90FIAT.png
2. IAT 64F MV: 929-942
http://i1126.photobucket.com/albums/l609/weathermanshawn/HO2IAT64F.png
TUNERS CHECKLIST
1. General Checklist
□ On a cold start, just prior to starting, IAT and ECT should be very close, within a few degrees of each other
□ MAP should read same as barometric pressure
□ MAF should read zero airflow
□ Battery should be fully charged and functional
2. General Maintenance
□ Replace air and fuel filters annually
□ Check oil level and replace dirty oil
□ Clean MAF with approved electrical cleaner
□ Check PVC system
□ Ensure spark plugs and wires are operating normally
□ Check for manifold and exhaust leaks
□ Replace Narrowband O2 sensors at least every 60,000 miles
3. Injector Tuning
□ Ensure your injector data is accurate
□ Check fuel pressure and replace the fuel pump/wiring, if necessary
□ Ensure you have the correct IFR slope (sloped vs. flat) and that it matches the FPR (un-reference vs. referenced)
□ Check for fuel leaks anywhere, which this is a fire hazard
□ Any bad grounds, insufficient wire sizing, and/or poor connections will lead to fueling problems
4. Tuning/Mechanical Issues
□ Ensure you do not have excessive heat-soak. For more accurate readings and consistent fueling, IAT Sensor should be located away from heat sources (like the radiator or the engine itself)
□ Home-ported throttle body can be problematic
□ Ensure catalytic converter(s) is(are) not blocked or plugged
5. MAF & Other Sensors
Good NBO2 in closed loop (i.e. trimming properly) will show these characteristics during steady part throttle:
□ Swinging faster than two (2) complete cycles per second
□ Swinging above 600 mV and below 300 mV
□ Average voltage will be close to 450 mV
□ If they switch slower than three (3) cycles per second, the trimming will lag a little behind
□ If they switch without going above 600 mV or below 300 mV then a DTC will trigger
□ If the average mV deviates significantly from 450 mV then the trimming will be to some unpredictable AFR
□ MAF signal should not show jagged edges or rapid changes in airflow during cruise or WOT. Some oscillation is normal, but it should not exceed 5% per frame (1/10 sec)
□ Wideband Location is crucial. Tailpipe locations should be avoided. Follow the wideband manufacturer’s guidance as to the location and installation. Sensors should be calibrated regularly, including heater calibrations if necessary.
Example of normal operating Closed-loop Scan with Fresh O2 Sensors. (Long-Tube Header Location) Shows NB switching, steady MAF signal, and wideband oscillating normally around stoich AFR.
http://i1126.photobucket.com/albums/l609/weathermanshawn/HeaderHO2.png
Example of why you should NEVER use Stock NarrowBands for WOT Tuning Fresh NB O2's..AFR both 12.62.
1. IAT 90F MV: 872-890
http://i1126.photobucket.com/albums/l609/weathermanshawn/WOT90FIAT.png
2. IAT 64F MV: 929-942
http://i1126.photobucket.com/albums/l609/weathermanshawn/HO2IAT64F.png