Native datalog analysis for Holley® EFI V6 and Terminator X™ V3.
Reads .dl and .dlz files directly — no Datalogger round-trip,
no CSV export. Built for tuners who want the answer fast.
If you tune a Holley, you've already done the dance — open Datalogger, wait for the file, hunt for the right channel, squint at one trace at a time. Tunelyzer is built around the three things that dance gets wrong.
Tunelyzer watches your datalog folder. Open the app
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
Datalogger round-trip, no CSV export, no waiting on
Holley's software to think.
See RPM, AFR, MAP, and EGT on the same plot — each with its own Y-axis, color-matched to its line. No more squinting at flatlined traces because one channel steamrolled the others.
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.
Peak RPM, max boost, min oil pressure, lowest AFR — the numbers you actually care about, pinned beside the plot. Updates as you pan and zoom. Answers "did this pass go well?" in one glance.
Build Horsepower, Torque, Converter Slip, AFR Error from formulas. Plot, stat, and warn against any of them like a real channel.
Overlay before/after tunes. Same scales. Synced cursors. Time-offset the runs to line up at launch, shift, or any point you pick.
One tab per view: Drive, 60-ft, Boost, Suspension. Mark traction loss at 0.8s in your 60-ft tab and the same marker shows up in your Suspension tab — and every other tab for that run. Notes are tied to moments in the log, not to a single view.
.dlz filesHolley names your logs with cryptic codes. Tunelyzer renames them on import using a template you control — date, tune name, track, anything you want to read at a glance.
Track, fuel, ET, 60-ft, tune notes — fully customizable per-log fields. Weather and density altitude auto-fetched from the date and location of the run. Search across every log you've imported to find "all my 1.5x boost runs at 2,500 ft DA."
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.
Tunelyzer is being evaluated by a small group of Holley tuners — running real `.dl` files on real cars across the V6 and Terminator X V3 ECU families.
The beta is invitation-only and not currently for sale. Public release is coming. If you're an active Holley tuner who'd be a strong fit for testing, get in touch — there's a short list and we read every email.
When Tunelyzer reaches public release, it'll be a one-time license — single machine, no subscription. Buy it once, own that version.