LS/VTEC Build — Tuning Dashboard

01Project-Wide Metrics

Aggregated across all 33 logs analyzed over the tuning window.

Logs analyzed

MSL + MLG, 4 formats decoded

7.2h

Logged runtime

1,509,931 total records

966

Best settled idle RPM

±42 (Day 9), target 906

Stall events (project total)

concentrated in days 3–5, plus 3 crank attempts day 8

Session Idle Speed & Stability Trend

Hover over data points to view exact session metrics and notes in real time.

Per-day idle mean, computed as the mean of every log's idle average that day (pooled full-session, not a single best segment). Days 8–9 are single cold-start logs, so their full-session means (1208, 1039 RPM) sit higher than the warm/settled idle those same runs reach once hot (963±95 and 976±68 RPM) — hover any point for the warm figure. This is also why the pooled numbers differ from the narrower ±48 RPM quoted for the day 7 validation run.

Where the build stands today The car starts, idles at target with tight stability, holds coolant temperature under load, charges correctly at 14.1–14.3 V, and has completed multiple road tests. Every remaining blocker is hardware, not calibration — see the report below.

02Browse by Day

Each day below has its own page with full log-by-log data, real statistics computed from the raw files, and the narrative of what was found and fixed.

Day 1

Aug 8-9, 2026

First Contact & Baseline Review

3 logs 14m logged 1612 avg RPM 2 stalls

Day 2

Aug 9-10, 2026

The IACV Investigation

3 logs 20m logged 1173 avg RPM 8 stalls

Day 3

Aug 11, 2026

Trigger Offset Bracketing

3 logs 44m logged 1289 avg RPM 20 stalls

Day 4

Aug 12-13, 2026

MLG Format Cracked, Cooling Bleed Begins

5 logs 63m logged 1649 avg RPM 0 stalls

Day 5

Aug 13-14, 2026

Polarity Correction & the Cranking Voltage Discovery

8 logs 39m logged 958 avg RPM 28 stalls

Day 6

Aug 14, 2026

PCV Fix, Idle Dialed In, First Road Tests

7 logs 96m logged 888 avg RPM 2 stalls

Day 7

Aug 16-17, 2026

Thermostat Replaced & Validation Testing

2 logs 109m logged 859 avg RPM 10 stalls

Day 8

Aug 18, 2026

Updated Tune Validation (Cold Start)

1 log 23m logged 964 avg RPM 3 stalls

Day 9

Aug 19, 2026

Cold-Start Idle Run

1 log 22m logged 976 avg RPM 0 stalls

03Estimated Engine Performance

Vehicle Speed reads 0.00 kph in every log on file, so no dynamometer-grade output figure can be calculated — rusEFI's virtual dyno requires a working VSS input and a WOT pull, neither of which exist in the current log set. No wideband O₂ is installed either. The figures below are physics-based estimates from logged airflow, not measurements. Day 9 extended the measured envelope to 6,231 RPM — its 5,900–6,100 RPM loaded points are the highest-RPM airflow data yet, and they track the VTEC-disabled projection, anchoring the top end of the curve with real data instead of pure extrapolation.

140–153

Estimated Peak Flywheel Power

modeled at 7,000 RPM rev limit — VTEC-disabled to tuned+VTEC (NA)

not derivable (no torque data)

Estimated Peak Torque

strongest breathing logged near 2,800–3,600 RPM

99.9%

Peak Volumetric Efficiency

measured Day 9 at 2,835 RPM; ~88–90% at 6,000+ RPM on the low cam

Performance Note The figures above are physics-based estimates from logged airflow, not measurements. All Day 9 data is on the low cam (VTEC not yet commissioned) at part throttle, so the measured points sit below the modeled WOT lines by design — scaled for load they track the VE 92% VTEC-disabled curve. The tuned+VTEC and optimistic lines remain projections until a wideband O₂ is installed and a full WOT pull is logged. Wideband feedback is required before adding timing or aggressive tuning.

04Engine Health & Telemetry Metrics Audit

Measured across raw datalog files to evaluate intake efficiency, starter battery health, electrical charging stability, and idle control performance. Values are the Day 9 session snapshot; metrics that Day 9 could not capture are noted inline.

Telemetry Channel	Baseline / Target Limit	Measured Value (Day 9)	Status / Health Assessment
Warm Idle Vacuum (MAP_idle)	30.0 – 36.0 kPa	30.4 kPa	EXCELLENT Solid manifold vacuum (σ 1.5 kPa); no unmetered intake leaks.
Idle Stability (σ_RPM)	±50.0 RPM	±42 RPM	EXCELLENT Tightest idle yet — settled open-loop control around the 906 RPM target (idle closed-loop never engages).
Alternator Load Droop (ΔV_batt)	< 0.40 V under load	14.34 V → 13.84 V	PASS Charging holds 13.84–14.34 V (14.20 mean) through fan cycling — no collapse under load.
Cranking Voltage (V_crank)	> 10.0 V minimum	not captured Day 9	OPEN Day 9 began with the engine already running, so no crank event was logged. Last captured start collapsed to ~5.58 V — battery, starter or ground-circuit hardware, independent of the tune.
IAT Heat Soak (ΔIAT)	< 15.0°F above ambient	+71°F to 158°F	MONITOR Large soak over a 22-min stationary idle with no ram air — expected with the car parked; would fall quickly once rolling.
Peak Volumetric Efficiency (VE_max)	> 85.0% NA	99.9%	CALCULATED Peak airflow at 2,835 RPM under load (part throttle; no true WOT pull on file).

04bCooling & Ring-Seating Evidence

Supporting charts for the root-cause and telemetry sections above.

Peak coolant temperature per session by date. ✦ Day 7 thermostat replacement dropped the ceiling from ~212–216°F to ≈196°F; Days 8 & 9 confirm the new stable ceiling.

Pre vs post rev comparison — Same commanded idle position, less throttle opening — yet 7.6 kPa more vacuum and 214 more RPM after the engine's first hard revs. Evidence of piston ring seating in progress.

Warmup tracking error — Idle tracking error across the warmup range, day 7 validation run.

06Actionable Next Steps (Hardware Checklist)

Priority	Item	Detail
HIGH	Cranking voltage collapse	Drops to 5.58V under load. Load-test battery, clean/torque grounds and starter feed.
HIGH	Wideband O₂ Integration	Gates all VE fuel auto-tuning and ignition mapping. Signal pin available at input D14.
DONE	Valve lash adjustment	Set to 0.007" intake / 0.008" exhaust, stone cold. Recheck after 3–5 heat cycles as the fresh valves seat.
MED	Ring seating	Underway, measurable already. Needs varied-load driving.
LOW	VSS input	Reads 0.00 kph. Required for virtual dyno and gear-dependent boost/idle tables.
LOW	Knock calibration	Flat −20dB placeholder. Profile noise floor before adding timing.