TuneVault FAQ: What It Does, What It Does Not, and What You Need
Straight answers to the questions people ask before signing up: what TuneVault actually is, why it works from screenshots, which engines it covers, what it costs, what hardware you need first, and the things it deliberately will not do.
By TuneVault
Most questions about TuneVault come down to one of three: what is it, what does it need from me, and what will it not do. This page answers them plainly, including the parts that are limits rather than selling points.
As of October 2026 TuneVault is a copilot for people tuning with HP Tuners. It audits your tables, tells you exactly what to change and in what order, and verifies the result from your datalog. It costs $39 per guided tune, or $19, $49 or $249 per month. It does not flash your car, it does not promise horsepower, and it does not replace a tuner on a difficult build.
What it is, in one paragraph
HP Tuners gives you access to your vehicle's calibration: it reads the file, lets you edit thousands of values, and writes it back. What it does not do is tell you which of those values matter or whether the one you just typed is safe. TuneVault is the layer that does. The longer version of that distinction is in TuneVault vs HP Tuners alone.
How a guided tune works
Five steps, and you are in control of each one.
1. Describe the build. Year, engine, power adder, fuel and modifications, in plain English. It is saved to the vehicle in your garage so you do not repeat it.
2. Upload screenshots of your tables. Injector data, the airflow model, spark, fueling and limits, captured from VCM Editor. Every value is read from the image, units included.
3. Read the audit. Each table is checked against the others and against sane limits: lean wide-open-throttle fueling, aggressive timing for the fuel, injector data that does not match the parts, an airflow meter running out of range. Findings are flagged critical, caution or good.
4. Apply the change list. Specific cells and specific values, ordered with safety and reliability first, with the reason for each. You make the edits and write the file with your own interface.
5. Verify with a datalog. After a drive, you upload the VCM Scanner log. Commanded and delivered air-fuel ratio, knock retard, fuel trims and intake temperature are checked, and you get a clear go or no-go.
The session — tables, audit and plan — stays saved to the vehicle, so you can come back to it, revise, and return to the last known-good state.
Why screenshots
This is the question that surprises people most, and the answer is simple: the HP Tuners file is encrypted. No third party can open it, and TuneVault does not try to.
Working from screenshots and logs is how tuners already review each other's work. It has one practical benefit too — nothing is hidden. Every value in the audit is one you can find on your own screen, in a table you can open, which is how you end up learning the calibration rather than receiving one. If the layout is new to you, VCM Editor for beginners is the place to start, and what's inside a tune file explains what the file itself contains.
What you need before you start
| Item | Why | Notes |
|---|---|---|
| HP Tuners interface | Reads, writes and datalogs through the diagnostic port | MPVI2, MPVI3 or MPVI4 |
| VCM Editor and VCM Scanner | Editing the calibration and recording logs | Part of the HP Tuners software suite |
| A licensed vehicle | HP Tuners licenses each vehicle with credits | Confirm your exact vehicle is supported first |
| Wideband oxygen sensor | The only trustworthy fueling measurement under load | Mandatory for wide-open-throttle or boost work |
| Battery maintainer | Stable voltage during a write | Cheap insurance |
TuneVault does not sell or replace any of those. If you are still deciding on hardware, the MPVI3 vs MPVI2 buying guide covers the interface, vehicle coverage, credits and VIN licensing covers how to check support before spending anything, and the question of whether you need a wideband before tuning has its own article. The first-year total is set out honestly in the hidden costs of DIY tuning.
Which engines it covers
Ford, GM and Dodge/Ram gasoline engines that are tuned through HP Tuners:
- GM: the LS family and the LT family, including swaps.
- Ford: Coyote 5.0, the 5.4 3V, and EcoBoost.
- Mopar: HEMI.
Naturally aspirated, supercharged or turbocharged, on pump fuel or E85. Each family has its own page under tuning services — for example Coyote 5.0 tuning, LS swap tuning and turbo tuning.
Two limits follow from that list. If HP Tuners cannot read and write your controller, TuneVault cannot help with it, because there are no tables to look at. And platforms tuned with other tools — most imports, for instance — are outside its scope; import tuning platform coverage explains where those owners should look.
What it costs and which plan fits
| Plan | Price | Suits | Includes |
|---|---|---|---|
| Per Tune | $39 per tune | One car, one time | Full audit, change list, one datalog verification pass |
| Garage | $19 per month | Weekend builders | Up to three guided tunes a month, unlimited datalog re-checks on your cars |
| Pro | $49 per month | Active DIY tuners | Up to ten guided tunes a month, unlimited log analysis, priority Copilot |
| Shop | $249 per month | Performance shops | Unlimited tunes and logs, multiple seats, customer and vehicle records |
The decision is mostly about revisions. Tuning is iterative: you change something, drive, log, and check. Per Tune includes one verification pass. If you expect to go around that loop several times — which most builds do — a monthly plan covers unlimited re-checks, and you can cancel when the car is finished. The detail is on the pricing page and in the pricing explainer.
For context, a custom dyno tune commonly runs $300–600. That is a different purchase: a tuner's time and a controlled load, against analysis you act on yourself. The honest comparison of the three routes is in copilot vs e-tuner vs dyno shop.
What TuneVault does not do
Stated as plainly as the features.
It does not flash the car. You do, with your interface. You are responsible for the changes you write.
It does not guarantee power. No figure, no promise. The aim is a safe calibration and sound data.
It does not work without data. No wideband, no verification of fueling under boost. This is deliberate.
It does not fix mechanical faults. A misfire from a failing coil, a vacuum leak or a weak fuel pump is not a tuning problem, and tuning around one makes it worse. The pre-tune mechanical checklist comes first.
It does not help defeat emissions equipment. Removing or disabling emissions controls is illegal under federal and state law. TuneVault does not provide guidance for it. What can be changed compliantly is covered in the tuning and emissions inspection guide.
It does not replace a tuner on every build. High boost, an unusual combination, or an engine with real money in it deserves a qualified person. Knowing where that line sits is the subject of when to stop DIY tuning.
Who it suits
The first-time tuner who has bought the interface and stalled at the wall of parameters. The audit tells you which tables matter for your build and the order that keeps the engine safe: airflow, then fuel, then spark.
The experienced DIYer who wants a second set of eyes before flashing — the lean cell or the aggressive timing value that is easy to miss at midnight.
A shop that wants audits done faster, every change documented, and the same safety checklist applied by every technician.
It suits least the owner who wants a finished file handed over with no involvement. That is a legitimate thing to want, and an e-tuner or a dyno shop is the right purchase for it.
Getting started
Have the interface, the software and a supported vehicle. Take a datalog of the car as it stands, so there is a baseline. Then open Get Started and describe the build. If the broader picture of what tuning involves is still unclear, how to tune your car covers the whole process before you spend anything.
Frequently asked questions
What is TuneVault?
TuneVault is a copilot for people tuning their own vehicles with HP Tuners. You upload screenshots of your VCM Editor tables and your VCM Scanner datalogs; it audits the calibration for safety problems, gives you an exact, ordered list of changes with the reasons, and verifies the result from a datalog. As of October 2026 it costs $39 per guided tune, or $19, $49 or $249 per month on a plan.
Does TuneVault flash my car or write the tune file?
No. You make the changes in VCM Editor and write them to the vehicle with your own interface. TuneVault gives guidance and verification; the laptop, the flash and the final decision stay with you.
Why does TuneVault use screenshots instead of the tune file?
Because the HP Tuners file format is encrypted and not something a third party can open. Working from table screenshots and datalogs is the same way tuners review each other's work, and it means every value TuneVault comments on is one you can see on your own screen.
Which vehicles does TuneVault support?
Ford, GM and Dodge/Ram gasoline engines tuned through HP Tuners — the LS and LT families, Coyote, the 5.4 3V, EcoBoost and HEMI — whether naturally aspirated, supercharged or turbocharged, on pump fuel or E85. Your vehicle must be supported by HP Tuners itself, because that is the tool that reads and writes the calibration.
How much does TuneVault cost?
A single guided tune is $39 and covers one vehicle with one datalog verification pass. Monthly plans are Garage at $19 for up to three tunes a month, Pro at $49 for up to ten, and Shop at $249 for unlimited use with multiple seats. Monthly plans can be cancelled at any time.
Do I need a wideband to use TuneVault?
For any wide-open-throttle or boosted tuning, yes. Without a wideband there is no trustworthy measurement of fueling under load, and guidance is only as good as the data behind it. TuneVault checks that a wideband is logged before it will verify fueling under boost.
Will TuneVault tell me how much horsepower I will make?
No. Power depends on your hardware, fuel, altitude and the condition of the engine, and nobody can promise a figure without measuring it. TuneVault focuses on whether the calibration is safe and whether the data supports it.
Does TuneVault replace a professional tuner?
No. It gives tuner-grade analysis and conservative, specific changes, but you or your shop make the call and flash the car. For high-boost or unusual builds a qualified human tuner is still valuable, and for a car with a mechanical fault a person in the room is the right answer.