MHD & bootmod3
Strong on the engine: boost, timing, fuel. Your gearbox stays exactly as it left the factory.
Tune the engine.
Tune the gearbox.
One licence.
Everyone else tunes half your car. Hellflash does the engine and the gearbox from one app, for less than either one costs on its own.
£300 one time for your car, with no subscription, and you can read your car for free first.
Everyone else tunes half your car.
The gearbox decides how fast you shift and how hard it holds the power. The big names make you buy a second tool for it. We don't.
xHP
Firmer, faster shifts. Nothing for the engine. A second app, and a second price.
Hellflash
Both halves, one app, one price. Tune the engine and the gearbox, and own it for your car.
Nothing hidden. See every change.
See what's on your car right now, and what every map changes against stock, before you build and before you write. No black boxes.
+28%more power, Stage 1
1,180live map tables
£300vs £580 to £850 the old way
Power at the wheels
Tuned Stock
Your whole car. One app.
The engine
More power, your way.
Tap a ready-made map, or open the sliders and shape boost, timing and fuel yourself. Kept in safe limits, and checked before it ever reaches your car.
- One-tap stage maps, matched to your car
- Simple sliders, or a full map editor when you want it
- An AI that writes the map for you
The half the big names skip
The gearbox
Finally, the half nobody else tunes.
Firmer, faster shifts that hold your new torque. Upshift torque-cut so it bangs through the gears. Plus the brap: real pops and crackle on hard upshifts, dialled by how loud you want it.
- Firmer, faster, harder-holding shifts
- Upshift torque-cut, the bang between gears
- The brap, as loud or as subtle as you like
One price. The whole toolbox.
No stripped trial. Your licence includes the maps, the editors, the gearbox tools and the updates for your car.
Ready-made stage maps
Proven Eco, Stock and Stage maps matched to your car. Pick one, build it, done. No tuning knowledge needed.
Custom tuning
Simple sliders for a quick change, a full pro editor when you want to go deep.
Gearbox tuning
Shift firmness, speed, torque-cut and the brap. The half the big names skip.
See what's on your car
The tune loaded right now, and every change it makes against stock, in plain words. Even a previous owner's tune. It only reads, it never writes.
Logging & faults
Log a drive, watch live data, read and clear fault codes. All built in.
Own your tune
No subscriptions. No per-flash credits. One licence for your car, yours to keep.
Built so you can't rush it.
Tuning is permanent. Hellflash protects your car at every step, and nothing is ever written unless you choose to.
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Backup firstA full backup of your car before any change is even built.
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Charger neededA write won't start without steady power and a charger on the car.
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In person onlyTuning is written at the car, with a clear confirmation. Never remotely.
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You see everythingEvery change is shown in plain words before you commit.
£300. One time. Per car.
The big names charge that for half the car. We do the engine and the gearbox, and you never pay again for that car.
£300
One time. One car. Yours to keep.
Get your licence
- Engine tuning: stage maps and a full editor
- Gearbox tuning: shifts, torque-cut, the brap
- See your tune, logging, live data, fault codes
- In-person flashing tools, safety first
- Map and feature updates for that car
- No subscription, no credits
Is your car supported?
Full engine and gearbox tuning on the cars below, with more added all the time. Not sure? Check yours in the app, for free.
Supported now
The engine and the 8-speed gearbox, ready today.
M240i340i440i540i
X3 M40iX4 M40iZ4 M40iToyota GR Supra
More on the way
New models added all the time. Add yours to the list and we'll tell you the moment it's ready.
Request your car
Two tools' worth of tuning.
One £300 licence.
Engine and gearbox, for your car, yours to keep. Read your car free in the app, and activate when you're ready.