Front End

The run

Conditions

Quick adjust

The between-races levers. Each tap changes the sheet and goes in the log. Tap what you did, not what you wish you did.

Tire temps, straight off the track (°F)

Three per tire: inside edge, middle, outside edge. Inside is the edge toward the middle of the car. Take them within a minute of stopping, right side first.

Hot pressures (psi)

What did the driver say?

Crew chief call

Run log

Backup

Everything lives on this phone. Export before changing phones or clearing the browser. The file restores every setup, baseline, track and run.

Track library

Edit banking or length if the track's numbers are wrong, add a track that is not here, or delete one you never run. Your saved baseline for a track lives with it.

Add a track

The car

My starting numbers

These are the numbers the sheet starts from at a medium, medium-banked track before it adjusts for the track. Change them to the chassis builder's numbers and every baseline in the app follows. Reset brings back the defaults for the car type above.

Wish list

Want the sheet to do something it does not? Tell us in one line and we try to have it for the next race. The button in the corner does the same thing from any page.

How this sheet was built

What it knows, where the numbers came from, what it assumes and how far to trust it. Read it here.

Order of operations at the track

1. Before the first lap. Set the sheet's baseline for the track. Scale the car, set pressures cold, check camber and caster with the gauge, set toe with the plates, tape the tires for stagger. Save the setup.
2. After every run. Temps first, right side first, within a minute. Then hot pressures. Then ask the driver. Enter it all on the Run tab and hit What do we change.
3. One change at a time. The sheet gives one main change and says what to leave alone. Apply it, log it, run again.
4. Feature setup. Load the run that felt best from the Log tab. That is your feature setup.

How the sheet reads temps

Camber comes from inside versus outside on each front tire. Right front wants the inside edge 10 to 20 degrees hotter than the outside. Left front wants outside even to a little hotter than inside. Outside that window the sheet moves camber a quarter degree, half if the run was long.

Pressure comes from the middle versus the edges. Middle hotter than both edges means too much air, cooler means too little. It also checks hot pressure gain: the right sides should gain roughly 2 to 4 psi, the lefts 1.5 to 3.

Balance comes from front average versus rear average, and left versus right. Fronts much hotter than rears is a tight car working its front tires to death. Rears hotter is loose. A left front as hot as the right front means the left front is carrying too much of the car.

The levers, in the order the sheet reaches for them: tire pressure, then front camber, then cross weight or rear stagger for balance, then toe. Springs, shocks and bars are on the sheet so you remember what is in the car, but the sheet does not tell you to change them. That is a conversation with the chassis builder.

The fast levers, between a heat and a feature

Half-round and half-pound steps. One lever at a time. If two levers say the same thing, use the one you can undo fastest.

Rules of thumb it uses

These are generic tour-modified rules. The chassis builder's sheet wins when it disagrees.