The tuning co-driver that reads your live telemetry, finds exactly what your car is doing, and dials in a tune for how you actually drive.
Even the best calculators out there apply fixed, real-world formulas to every car. Horizon has never worked that way. Every car carries hidden stats and multipliers you'll never see in a menu, so two builds with identical numbers on paper can behave like completely different animals. And no formula knows the driver: your style, your hands, and your limits change what the right tune even is.
Slipstream doesn't apply a formula. It measures your car, with you driving it. That's the only place a real tune can come from.
Every tuning calculator runs a real-world formula off your weight and power. None of them ever watched your car turn a corner. Slipstream solves the car's balance from raw telemetry, sixty times a second.
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commanded = G(|steer|)·steer·speed balance = (yaw − commanded)·sign(yaw)
Not "oversteer" — which one. The same slide gets a different name, and a different fix, by where and when it bites: entry, apex or exit, on the brakes or on the gas.
Drive, get scored, get the next change, drive again. It steps bold, then fine-tunes in — and when the tune has done all it can, it tells you straight: that's the tires now, not the tune.
one clean lap — corners detected automatically
every corner graded — lower is better
Rear ARB 27 → 23 — one real number to type in
repeat until it's dialed
Pick a style and it moves the target — how much rotation it leaves you to work with. Aggressive keeps the car loose on purpose, for hands that can use it. Or just flag what you feel and it folds that in.
It knows skill when it sees it. On Aggressive, intentional snap rotation, lift-off and trail-braking read as your driving — not faults to tune away.
Neutral and settled.
The launch film comes with the first 25 keys free — first come, first served. After that it's $4.99, once.
A full setup before you've turned a corner — pick the car and the feel.
One lap and it knows your car's real grip, so the read is true to that car.
Saved per car with full history. Send one to a friend.
Calls it when it's the tires, not the tune — and won't chase a problem past the wall.
Say what you feel and it syncs your words to the data. Optional, local, off by default.
One profile per car: its tune, its characterization, its whole history.
Open the dashboard on your phone — a live pit board and Coach right beside your wheel.
A slim live readout over the game while you drive — glance, don't alt-tab.
Pure read-only telemetry — your car and your controller, straight off Forza's official feed. Slipstream reads every input you make and sends none of its own, so there's nothing for anti-cheat to flag. And telemetry out isn't a hack — it's a switch Forza itself ships in its own settings menu.
There's no company behind this. I'm one guy who's way too into cars, and I got tired of guessing at tunes, so I built the thing I wanted. Every dollar from Slipstream goes into my actual project car, a '91 Mitsubishi 3000GT SL. I'll post build updates on this page as it happens.
If it helps you go a little faster and have more fun with the game, that's the whole point. If you end up buying it, seriously, thank you.— the guy with the 3000GT
Flip on Data Out, open the app, and let it read your first corner.