It reads what your car is doing from live telemetry, then tunes it for how you actually drive.
Most tuning apps just plug your weight and power into one generic formula. Horizon doesn't work like that. Every car carries hidden stats and multipliers you'll never see in a menu, so two builds with identical numbers on paper can drive completely differently. And no formula knows how you drive, which changes what the right tune even is.
Slipstream doesn't use a formula. It measures your car with you driving it.
Other apps just run the numbers, your weight and your power, and hand you a generic guess. None of them ever watched your car turn a corner. Slipstream reads what the car is actually doing from live telemetry, sixty times a second.
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commanded = G(|steer|)·steer·speed balance = (yaw − commanded)·sign(yaw)
Slipstream tells you 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 makes a bold first move, then smaller ones. 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. That's how much rotation it leaves you. 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, deliberate snap rotation, lift-off and trail-braking read as driving you meant. It won't tune them 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. Won't chase a problem past the wall.
Say what you feel and it matches your words to the data. Optional and local, off by default.
Every car keeps its own profile, with its tune, characterization and full 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 from 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 is 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, great. If you buy it, seriously, thank you.The guy with the 3000GT
Flip on Data Out, open the app, and let it read your first corner.
Tell me what broke, what’s missing, or what you love. It goes straight to me, no ticket queue, no bot.