Jack Performance Intelligence
Your tuner speaks data. JPI speaks driver.
Vehicle intelligence for tuned performance cars. Connects to any OBD-II vehicle via Bluetooth adapter, transforms raw telemetry into plain-English insights, and generates a shareable Tuner Briefing you hand to your tuner.
The Gap
Where JPI lives
Show you gauges. Maybe a DTC reader. You get numbers — you're on your own figuring out what they mean. Fine for checking a check engine light, not for understanding your tune.
Reads the same data your tuner reads and explains what it means. Knock correlation, fuel trim trends, thermal patterns. AI narrative runs entirely on your phone. No Windows laptop, no steep learning curve.
HP Tuners, MPVI4 — built for professional tuners. $750+ hardware, Windows-only, steep learning curve. Incredibly powerful, but not designed for the car owner.
Features
What JPI does
Plain-English Telemetry
Reads the same data your tuner reads — knock counts, fuel trims, intake temps, MAF — and explains what it means. Works with any OBD-II vehicle.
Wrist Alerts
Apple Watch companion taps your wrist when it detects sustained knock. You feel it before you see it. Eyes on the road.
Tuner Briefing PDF
AI-authored report you hand to your tuner. Session data, trend analysis, and a plain-English narrative. Shareable, printable.
Vehicle Baselines
JPI learns your specific car's normal operating ranges over three sessions. Then it tells you when something shifts — before you notice it yourself.
DTC Severity Engine
Not all trouble codes are equal. JPI ranks them by severity with vehicle-specific context — so you know what needs attention now vs. what can wait.
Read-Only by Design
JPI never writes to your ECU. It reads OBD-II data only. Your calibration is safe.
Compatibility
Works with your car
Fully Supported Platforms
C7 Corvette today · more platforms coming
- Enhanced OEM PID access — deeper data than standard OBD-II
- Platform-specific intelligence and thresholds
- VVT/cam monitoring and transmission health
- Vehicle-specific DTC context
Standard OBD-II
Any make/model from 1996+
- Live gauges and real-time telemetry
- DTC reading with severity ranking
- Session recording and vehicle baselines
- AI-powered Tuner Briefing PDF
Pricing
No subscription. No recurring billing.
Free
$0
- Live OBD-II gauges
- DTC reading
- Session recording
Pro
One-time purchase$49.99
- Everything in Free
- AI-powered plain-English insights
- Tuner Briefing PDF generation
- Apple Watch knock haptics
- Vehicle baselines and trend detection
- DTC severity engine
- Enhanced OEM PID access (supported platforms)
Requirements
OBDLink MX+
~$100 · sold separately
iPhone
iOS 17+
Apple Watch
Optional · for haptic alerts
Start understanding your tune
Download JPI free. Upgrade to Pro when you're ready for AI-powered insights, wrist haptics, and the Tuner Briefing.