Idle Tips & Tricks
The Basics:
1. Proper Fueling
2. Enough Base Spark
3. Enough Desired Airflow.
Make the least amount of changes to maximize Idle!
Do not Alter the Following:
1. IAC Effective Area (unless different TB size).
2. Start-Up Airflow Corrections
3. Airflow Parameter(s) that affect Idle.
1. B0101-Main VE Table: Perform Calc.VET or AutoVE for the Idle Rpm's 800- 1200. For 400 Rpm's extrapolate the 800 Rpm Values minus 10%.
2. B4307-Desired Airflow: Log SAE.MAF (g/s) vs ECT at Idle. The goal is to have your MAF, VE, and Desired Airflow all utilizing identical Airflow Values. RAFIG may produce values too low.
3. B4352-Cat Light-off Idle Offset Multiplier: Make Multiplier zero (0). Eliminates additional Airflow Source while tuning Idle.
4. B4504- Airflow learning Control Delay: Change per Idle Tutorial from 1.3 to 4.3 seconds.
5. B4512, B4514, B4515- Learning Parameters: Per Idle Tutorial.
6. B4309-Throttle Cracker Airflow in Gear (TC): Utilize the least amount of air to prevent Rpm's hanging (cruise control), but enough to prevent excessive engine braking and lack of throttle response. A great 'Stall Saver' is to add +4 g/s to the 400 Rpm Values. A good TC Table will gradually decrease throughout the RPM and MPH range, with no 'holes' or added air. I use a 98 Camaro LS1 Automatic TC Table with about 33% less air (-33%).
7. B4315-B4320 Throttle Follower: Identical values as Idle Tutorial. Great way to get additional Air when you press the throttle.
8. B5932-Base Spark in Gear: Add +4 degrees to Spark Values in the 400 RPM Idle Region, and +8 to to the 0 RPM Idle Region on Base Spark. If the car wants to stall you automatically get a bump in Spark to help prevent Spark for going to low. If your car wants to stall when you shift into gear (High-Octane Spark), then your Spark is probably dropping to low. Your High Octane Spark and Base Spark in gear should be within 4 degrees of each other.
Note: Tables are for Illustrative Purposes only. Use discretion in modifying Tune..
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LS1 CAM/IDLE BASE Tune & IDLE PDF (See Below) **
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Credits: SSpdDmon's EFILive's Idle Tutorial:http://forum.efilive.com/showthread.php?4661-Idle-Tuning-Helpful-Info-Inside.
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