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NRG and car class

If you're racing a Hypercar (LMH/LMDh), GT3, or LMP2 in Le Mans Ultimate, you've got an NRG (hybrid energy) system to manage alongside fuel. StintIQ's fuel calculator handles NRG as a second constraint that runs in parallel with fuel — but the inputs differ by car class because the underlying budgets work differently.

Hypercar

In LMH and LMDh, you get the full 100% hybrid budget per stint. The car deploys based on the strategy you've programmed, but the ceiling is always 100%. If you burn it down too aggressively, you pit early (or run with no hybrid for the last few laps).

StintIQ inputs for Hypercar:

  • NRG per lap (%) — the rate at which the car burns hybrid energy per lap (e.g., 12.5%/lap).
  • No second input needed — the 100% budget is implicit.

The math:

  • Effective NRG capacity = 100%.
  • Laps per NRG charge = 100 / nrg per lap.

If nrg per lap is 12.5%/lap, you get 8 laps per charge. The calc checks this against laps-per-tank and reports whichever is tighter.

GT3

In LMU GT3, NRG works differently — there's no full 100% budget. Instead, the BoP (Balance of Performance) assigns you a fixed number of laps of hybrid per stint (e.g., 5 laps). Your effective capacity is that lap budget × the burn rate.

StintIQ inputs for GT3:

  • NRG per lap (%) — same as Hypercar; the burn rate.
  • NRG laps — the BoP-assigned lap budget for the car at that track. Check the race-day BoP sheet.

The math:

  • Effective NRG capacity = nrg laps × nrg per lap.
  • Laps per NRG charge = nrg laps (tautologically — your charge runs for exactly the BoP lap budget).

So if BoP gives you 5 laps and the burn rate is 14%/lap, your effective capacity is 70%. That's the number the calc uses.

LMP2

LMU LMP2 follows the same shape as GT3 — there's no full 100% budget. BoP assigns you a fixed lap budget of hybrid per stint (set by the LMU rulebook). Your effective capacity is that lap budget × the burn rate.

StintIQ inputs for LMP2:

  • NRG per lap (%) — the burn rate.
  • NRG laps — the BoP-assigned lap budget per stint. Pull this from the LMU ruleset for your car at the track you're running.

The math is identical to GT3:

  • Effective NRG capacity = nrg laps × nrg per lap.
  • Laps per NRG charge = nrg laps.

So if the rulebook gives you 12 laps at 8.5%/lap, your effective capacity is 102%. The calc reports whichever is tighter — fuel or NRG.

Sim-aware NRG section in the new-plan form

The NRG section adapts to your team's sim:

  • ACC — section hidden entirely (no NRG mechanic).
  • iRacing — Hypercar only.
  • LMU — all three options (Hypercar, GT3, LMP2).
  • Other sims — all three options, in case your league uses an NRG convention.

The standalone Fuel Calculator (/tools/fuel) and the Discord bot's /fuel slash command have no team context, so they always offer all three classes.

Why the split?

We tried a single "NRG capacity" input early on and it bit us. The same number meant something different for Hypercar vs GT3 captains, but the calc treated them the same — wrong projections, no error. Now you tell us the car class and we apply the right formula.

Not racing Hypercar, GT3, or LMP2?

Leave the NRG fields blank. The calc runs fuel-only.

If you're not sure of your numbers

  • NRG per lap — easiest to measure from practice. Drive a lap, note the % dropped. Repeat for confidence.
  • NRG laps (GT3 + LMP2) — straight from the BoP sheet for your car at that track.

If you guess wrong, the projection is just wrong. The math has no telemetry input — it trusts what you tell it.

Have questions? Join our Discord →