EVUL Empire Racing

RACE CALCULATORS

Battery sizing, gearing and pack weight for 132 ft drag. Tap a tool, enter your numbers, read the gauge.

OPEN THE TOOLS ▼READ THE GUIDES

THE TOOLS

BATTERY SIZING calculator screenshot
CALCULATOR

BATTERY SIZING

Weight, gearing, kV, cells and pack IR → peak amps, sag and motor load. Live tuner plus a 3-car table.

OPEN CALCULATOR ▶
GEARING calculator screenshot
CALCULATOR

GEARING

Motor pinion → spur → diff pinion → ring → wheel. Final drive, rollout, top speed and motor load.

OPEN CALCULATOR ▶
DRAG PACK WEIGHT calculator screenshot
CALCULATOR

DRAG PACK WEIGHT

Find the lightest mix of cells and supercapacitor strings that holds voltage through the launch.

OPEN CALCULATOR ▶

THE GUIDES

GEARING GUIDE cover
PDF GUIDE

GEARING GUIDE

Pinion, spur, ring and pinion: how the gears multiply, rollout and top speed, in pictures.

OPEN PDF ▶
DRAG BATTERY SIZING GUIDE cover
PDF GUIDE

DRAG BATTERY SIZING GUIDE

Size a 132 ft drag pack by internal resistance and sag, not the label C rating.

OPEN PDF ▶

WHERE IT STARTED

EVUL 2015 world-record puller on grass with sled box
2015 · WORLD RECORD

319 LB FOR 32 FT

The 2015 world-record puller: 319 lb pulled 32 ft. Everything on this site grew out of builds like this one.