For JB4-tuned turbo cars
Upload a JB4 datalog and get instant boost, knock, and fuel-trim analysis — with engine-health trends and alerts the moment something flags trouble.
7-day free trial, then $7/mo or $59/yr · cancel anytime
21.0 psi
1
10.9%
1 crit · 4 warn
critical · knock
Run 1: 1 sudden timing drop (worst 6°) — likely knock with the ECU protecting the engine. Check fuel octane, plugs, and intake temps.
warning · boost
Run 1: boost held 3 psi under target while the wastegate was commanding ~max duty (90%) — the signature of a boost leak (charge pipe, coupler, or intercooler) rather than wastegate calibration. Check for leaks first.
warning · fuel
Run 1: AFR ran leaner than 13.5:1 above 10 psi for 3 consecutive samples (max 13.8:1) — typically enrichment lag during spool; keep an eye on it.
warning · boost
Run 2: boost held 3.6 psi under target while the wastegate was commanding ~max duty (90%) — the signature of a boost leak (charge pipe, coupler, or intercooler) rather than wastegate calibration. Check for leaks first.
warning · fuel
Fuel trims averaged 10.9% at WOT — adding fuel (possible intake leak, weak fuel delivery, or injectors). Beyond ±10% deserves attention.
info · temps
Run 1: intake temps climbed 32° during the pull (peak 132°) — intercooler heat soak. Expect some timing pulled when hot.
This is a sample log. Start a free trial to upload and analyze your own.
☝ That's the actual product — no competitor analyzes JB4 logs for you like this.
datazap shows you the numbers. Auto Tracker tells you what they mean — and keeps the whole build in one place.
Upload a CSV (or pull it from Google Drive) and we detect every WOT pull, then compute peak boost, knock events, fuel trims, and boost-vs-target — and flag the issues automatically. No more squinting at rows on a forum.
Every log feeds trend charts for boost, timing, fuel pressure, and more — so creeping problems show up as a line heading the wrong way, long before they leave you stranded.
Schedule services by time or mileage, estimate your current odometer between updates, and get told what's due — and what's overdue — at a glance.
Track your parts inventory, log open issues, and keep a running tally of what the build has cost you.
Unlimited vehicles, a photo gallery per car, and insurance and document storage — one command center for everything you own.
Critical and warning flags surface knock, lean conditions, boost leaks, and heat soak the moment a log shows them — so you can back off before something breaks.
Tuned for the cars and the people who run them — technical, data-driven, and serious about their engines.
Every plan starts with a 7-day free trial and unlocks the entire app.
Every plan unlocks the whole app
Import your first log in under a minute. Free for 7 days.