Native datalog analysis for Holley® EFI V6 and Terminator X™ V3.
Reads .dl and .dlz files directly — open the app,
get the answer. Built for tuners who want speed.
Tunelyzer is built around three things — getting your runs in fast, knowing what they tell you at a glance, and catching trouble before it catches you. Every pass, every time.
Tunelyzer reads your datalog folder. Open the profile
after a pull and your latest log is already loaded —
or every new log since last time, your call. Native
parsing of .dl and .dlz files means
no round-trip through another tool, no waiting.
Walk back from the round, open the laptop. Latest pass already loaded — DA, weather, and tune name auto-filled. Warning rules already ran on it. Two glances and you know if the tune held.
Set warning rules once — "AFR under 12.5 in boost", "oil pressure below 40 over 4,000 RPM" — and every future log gets a status badge. Green means clean. Red means something needs your attention. No more checking each channel manually after every pass.
A real Holley pull loaded — tabs across the top, multi-axis plot on the left, live stats panel in the middle, channel picker on the right. Quick stats sit underneath. Everything you need on one screen.
Every feature here exists because something about the stock viewer made the job harder than it needed to be.
Open a profile and Tunelyzer lists every log in its datalog
folder, newest first. Pick the one you want, or flip the
auto-import flag and every new pass loads automatically. Keep
a profile per scenario — race day, driveway tuning, customer
cars — each with its own folder, channels, warnings, and tabs.
.dlz and .dl files are treated the same
— no separate unzip step, no waiting, no extra clicks.
.tnzprof — share a vetted setup with another tunerVersus: the long way — open the viewer, find the file, wait for it to render. Every time.
Track, fuel, ET, 60-ft, tune notes, knock zero, pulse modifier —
every log carries fields you define. Add a field,
rename it, change its type, hide it, delete it. Reorder by
drag. The card is yours. Tune name auto-populates from the
.dlz on import so you never type it.
Versus: a single fixed notes field per log. Hope you remember what you ran last week.
Click Current Weather for your live DA right now — handy
when you're at the track and trying to decide what tune to load.
The same source auto-fills temperature, humidity, barometric
pressure, and DA on every log you import, looked up from the
date and location of the run. Already have a year of .dlz
files? Import them and Tunelyzer pulls historical weather on
every one. Your archive becomes searchable by DA in one go.
.dlz files get the weather they ran inVersus: type the DA in by hand from whatever weather app you trust. Every pass, every time.
Click the search icon next to the Log Info button and the Search logs dialog opens. Fill any fields you care about — Tune, Fuel Type, Tune Changes, Notes — plus min/max ranges on Air Temp, Humidity, Barometer, Wind, and Density Altitude. Results update live as you type, with a match counter at the bottom ("2 of 7 logs match"). Double-click any result, or hit Open, and you're in that log.
e85 to match anything containing it1500…2500 ft DA gives you every altitude-y passe85 + DA min 2000 + Notes contains colder plugs in a single searchVersus: scroll a flat list, hope the filename is descriptive enough to find what you're after.
The stats panel pins the two things you want first after a pass. Warning rules fire green or red against conditions you've set ("AFR below 12.5 in boost", "oil pressure under 40 over 4,000 RPM"). Right next door, Quick Stats shows the headline numbers — peak RPM, max boost, lowest AFR, min oil pressure — updated as you pan and zoom. Two seconds and you know if the pass went well.
.tnzwarn — share with another tuner; per-profile so each car has its own setVersus: read every curve and scroll every log, every pass, every time.
Lay last week's pass on top of today's. Pick overlay (dashed lines, same plot) for matched scales, or split (pane underneath, shared X-axis) when the curves are too crowded to read on one. Line up at launch uses your profile's auto-zero trigger — one click and both runs start from the same instant. Time-shift manually if you need finer alignment.
Versus: two windows side by side, eyeballing the difference by hand.
Wrap a channel name in brackets and use the usual math:
Horsepower = [RPM] * [Torque Estimate] / 5252.
Once saved, your math channel works like a real one — plot
it, stat it, warn against it. Math channels can reference
other math channels, so you can stack simple formulas into
fancy ones. Hit Test to run it on the open log before you
save so you can sanity-check the numbers.
abs, min, max, sqrt, log, clamp.tnzmath files — share a custom formula with another tunerVersus: no built-in way to compute it. Eyeball peak values, run the math in your head, or skip it.
A 60 Foot tab zoomed to launch. A Suspension tab with the shock and ride-height channels. A Boost tab with RPM, TPS, MAP, and knock stacked in their own panes — shared time axis, synced cursor. Drop a note ("traction loss at 0.8s") in one tab and it shows in all of them. The note follows the moment in the run, not the view.
Versus: one view, switched between channels by hand, every time you reopen.
Tunelyzer reads native Holley `.dl` and `.dlz` files from the V6 and Terminator X V3 ECU families. Designed to run on the laptops you already use at the track or in the shop — including older hardware.
No questions, no forms. Just email me directly.
Every fix and feature in this major version is yours. Buy once, own this version.
One activation per license. Changing shop laptops? Email me and I'll move it. Free.
One activation ping on first launch. After that, no telemetry, no analytics, no usage tracking.
Introductory price: $99. Regular price $129 once the introductory window closes. One-time payment, single machine, no subscription. 30-day refund if it's not for you.
Online ordering opens shortly.
Email info@tunelyzer.com — click the button if you have a mail app set up, or copy the address — and you'll get a note the day sales go live.
Holley EFI V6 (Dominator family) and Terminator X V3 datalogs (.dl and .dlz). Sniper support is on the roadmap — email me your files if you'd like it prioritized.
Probably yes today. Tunelyzer isn't yet code-signed, so SmartScreen may show "Windows protected your PC" on first run — click More info → Run anyway. A signed build is coming; the same license activates either version.
One license = one machine at a time. If you change shop laptops, email me and I'll move the activation. No charge.
All v1.x updates are free for life — emailed to license holders. v2.0, if it ever happens, will be a paid upgrade with a meaningful discount for existing customers.
30 days, no questions asked. Just email info@tunelyzer.com and you'll have your money back the same day.
License activation needs an internet connection once on first launch to verify your key. After that, the app runs offline. No telemetry, no analytics, no usage tracking.
Windows 10 / 11 only at launch. The Holley tuning world is overwhelmingly Windows, but if enough demand shows up, Mac and Linux could follow. Email me if a port matters to you.
If you open Holley datalogs and want a faster, clearer view of them, yes. If you don't yet collect logs, get familiar with the standard tooling first and come back later.