Ethanol Content Calculator

Calculate actual ethanol content effects on air-fuel ratio, injector duty, fuel flow requirements, and timing adjustments.

Input Parameters

Results

--
Target AFR (Ethanol Blend)
--
Fuel Flow Increase
%
--
Injector Duty Cycle
%
--
Estimated HP Gain
hp
Note: E85 requires ~30% more fuel volume but offers 105+ octane equivalent, enabling more timing advance and boost. Verify flex-fuel sensor accuracy.

Reference

Stoich Blend = Stoich_gas x (1 - E%) + Stoich_eth x E% Stoich Gas = 14.7, Stoich E100 = 9.0 Target AFR = Stoich_blend x Base_AFR / 14.7 Fuel Increase = (14.7 / Stoich_blend - 1) x 100 HP Gain from higher octane + charge cooling