SleepyTuned started with a car I loved and an experience I didn't. Everything here is built around fixing the second part.
I owned a 3.3T, I wanted more out of it, and I did what most owners do: I paid a bigger shop and waited. What came back was a generic file, slow replies, and the feeling of being a transaction rather than a customer. I wanted someone who knew the platform and actually cared how my car ended up. I could not find them.
So I stopped waiting. I learned to tune the Lambda 3.3T myself, the hard way, on my own car, reading the ECU instead of guessing at it. I spent a long time on how this engine and transmission actually behave, tested everything before I trusted it, and ended up as the tuner I would have wanted to hire in the first place.
That is the whole idea behind SleepyTuned: build the shop I could not find. Honest numbers, support from the person who wrote your file, and calibrations made for owners who care about these cars as much as I do.
We work on one family of cars: the Kia Stinger, the Genesis G70, G80 and G90, and the Hyundai N platform. One family done properly beats a little of everything done generically. Here is what that focus buys you.
The transmission tune is where we go deepest. Faster, sharper shifts, gears held where you want them, and a car that finally behaves the way it should. It is the change most owners notice first, and almost nobody on this platform does it well.
With an EK1 in your OBD2 port we flash your ECU from wherever you are. No shipping the car, no mailing an ECU. You stay in your driveway and the tune comes to you. The EK1 itself is not included with a tune.
We publish tested estimates and label them as estimates. If a figure needs meth, a turbo upgrade or a particular fuel, we say so before you buy rather than after.
No mailing your ECU and no guesswork between checkout and a flashed car.
Pick your tune and tell us the car, the mods, the fuel and what you want from it. Not sure what fits? Message us first. We would rather point you at the right option than sell you the wrong one.
Your file is written against your exact ECU calibration ID and your setup, on a platform we know well, then checked before it goes anywhere near your car.
With an EK1 in your OBD2 port the finished file is flashed remotely. You drive it, send logs, and we revise from there. Revisions for anything tune-related are included.
Our mission is to support this community with thoughtful, well-tested tuning that puts safety, reliability and real performance first.
Every strategy is researched and refined on our own cars before it reaches yours. Not because it is profitable, but because the platform deserves to be pushed forward properly. We publish what we learn in the knowledge base instead of building walls around it.
This is not only about making fast cars faster. It is about leaving the platform better for everyone who drives one.
What we have written upMessages go to the people who built your tune, not to a ticket queue that forgets you after checkout. Questions and revisions are handled by name.
We research and refine on our own cars first. Nothing ships until it holds up on the platform, because we have to live with these files too.
Honest estimates, clear about what each tune needs, upfront about what your car will and will not do. If something is not right for you, we say so.
We stock what we would fit ourselves: SleepyTuned calibrations, Lambda Raceworks hardware, ARP fasteners and NGK plugs. Not a wall of everything.
We do not write these. A few from owners who let us share their words and handles.
Christian is the man when it comes to these 3.3 and custom tunes... the difference was night and day. Been running his E-40 tune 40k+ miles with no hiccups and just the proper maintenance.
My Stinger is far superior on sleepy's full E30 ECU flash compared to the stock tune! Car feels like it delivers power smoother and just runs healthier overall. Oh yeah and it's wayy faster lol. Would 10/10 buy his tune if you're on the fence.
Best tune for the Stinger & Genesis platform! My Stinger GTS now performs the way it looks. FAST! SleepyTuned changed the game for the KDM platform.
Shared with each owner's permission. Results vary with the car, its modifications and its fuel.
Tuning is delivered remotely, so where we sit matters less than it used to. Hands-on work is a different story: installs, head studs, engine builds and transmission work happen in Texas, out of DFW and Alvin. You can book a date, have the car transported, or ask about us coming to you where that is offered.
DFW and Alvin, Texas
What it is, what is on it and what you want from it. We will tell you what is worth doing, and what is not, if that is the honest answer.
