sample-drive.csv
1977 Chevy P30 — 496 ci, 100.53 lb/hr injectors
563 samples · 76.0 s
Time Trace
Grid Chart
AFR diff · RPM × MAP
0+ RPM · 80+ kPa
no data
500+ RPM · 80+ kPa
no data
1000+ RPM · 80+ kPa
no data
1500+ RPM · 80+ kPa
no data
0+ RPM · 70+ kPa
- min
- -3.40
- max
- -
- median
- -1.20
- samples
- 74
500+ RPM · 70+ kPa
- min
- -3.30
- max
- -1.40
- median
- -2.65
- samples
- 4 · low confidence
1000+ RPM · 70+ kPa
- min
- -3.90
- max
- -3.70
- median
- -3.80
- samples
- 3 · low confidence
1500+ RPM · 70+ kPa
no data
0+ RPM · 60+ kPa
no data
500+ RPM · 60+ kPa
- min
- -
- max
- -
- median
- -
- samples
- 2 · low confidence
1000+ RPM · 60+ kPa
- min
- -3.20
- max
- -0.20
- median
- -0.80
- samples
- 5
1500+ RPM · 60+ kPa
no data
0+ RPM · 50+ kPa
no data
500+ RPM · 50+ kPa
- min
- -0.70
- max
- -
- median
- -
- samples
- 9
1000+ RPM · 50+ kPa
- min
- -
- max
- -
- median
- -
- samples
- 2 · low confidence
1500+ RPM · 50+ kPa
no data
0+ RPM · 40+ kPa
no data
500+ RPM · 40+ kPa
- min
- -0.90
- max
- 0.10
- median
- -
- samples
- 168
1000+ RPM · 40+ kPa
- min
- -
- max
- 0.10
- median
- -
- samples
- 76
1500+ RPM · 40+ kPa
- min
- -
- max
- -
- median
- -
- samples
- 1 · low confidence
0+ RPM · 30+ kPa
no data
500+ RPM · 30+ kPa
no data
1000+ RPM · 30+ kPa
- min
- -
- max
- -
- median
- -
- samples
- 8
1500+ RPM · 30+ kPa
- min
- -
- max
- -
- median
- -
- samples
- 1 · low confidence
0+ RPM · 20+ kPa
no data
500+ RPM · 20+ kPa
no data
1000+ RPM · 20+ kPa
no data
1500+ RPM · 20+ kPa
no data
Blue = lean (actual > target) · Red = rich · Green = good · low confidence due to few samples
Tuning Report
Prepared from a 76.0 s run
Jul 8, 2026
Report № sample · Sheet 1 of 1
Vehicle: 1977 Chevy P30 — 496 ci, 100.53 lb/hr injectors
Log: sample-drive.csv
Run: 76.0 s · 563 samples
Coverage: Idle (44%) · Decel (3%) · Crank (2%)
We reviewed this datalog. Idle mixture looks good, Idle stability looks good. 1 item(s) are worth addressing before your next drive.
Recommended attention
-
1. Idle air control
IAC avg: 38.5 countsAdjusted limit: 25.6 counts @ 78.1 kPaIAC averaged 38.5 counts at warm idle — above the 6–20 count band ACES targets in neutral. That high, the IAC is carrying airflow the throttle blade should, leaving it less authority when load changes. This log reads 78.1 kPa barometric, so the limit is elevation-adjusted to 25.6 counts — set the throttle stop at the lowest elevation you drive, since counts read higher up high.
Suggest: Open the throttle plates (throttle shaft adjustment screw clockwise) until IAC Position reads between 6 and 26 (elevation-adjusted from ACES's 6–20 sea-level band) at operating temperature — that band leaves the valve room to add or remove air as load changes. If TPS rises above zero, redo TPS Autoset.
- Idle mixture
- Idle stability
- Idle air control (low)
- Idle air control steadiness
- Throttle position at idle
- Charging
- Cranking voltage
- Fuel trim correction
- Tip-in mixture
- MAP sensor
Not enough data to judge: Cruise mixture · Injector duty cycle
Log a longer drive that holds these conditions — steady idle, some cruise time — and we'll call them on your next upload.
Keep this log for good
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