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What size injectors does a 2001 LS1 need to run E85?

Here is what the documentation says. Each point links to its source; tables and names vary by computer, operating system and tuning software.

  • E38, E67, P01, P59, Terminator X; LM7, LQ4, LQ9, LS1, LS3, LS6; 1999-2013: A proper E85 fuel system needs 30-40% more flow capacity than the gasoline equivalent; injectors should be sized to stay at or below 90% duty cycle and the pump should carry 10-20% headroom. Materials to avoid include PVC, nitrile, natural rubber, urethane, non-anodized aluminum, zinc, brass, and untreated ferrous metals, and pre-2001 OE fuel systems were not engineered for any ethanol concentration. (Performance Racing Industry)
  • E38, E67, P01, P59, Terminator X; LM7, LQ4, LQ9, LS1, LS3, LS6; 1999-2013: For E85 service, injectors with stainless steel internals (such as Bosch EV14) resist the corrosive environment, Viton O-rings are the preferred seal material, and a serviceable inlet filter on each injector serves as the last line of defense against fuel-system residue clogging. (Performance Racing Industry)
  • P01, P59; LS1; 1998-2002: Converting a fourth-gen F-body LS1 to E85 required swapping to high-flow E85-compatible fuel pumps and larger injectors, because ethanol's substantially lower lubricity quickly wears out a standard pump not designed for it; OBD-II-era fuel systems otherwise already tolerate the ~10% ethanol in pump gas. (LSX Magazine)

More in fuel, E85 & boost, or build a checklist for your swap with the tune checklist tool.

Confidence: medium — sources disagree or are limited; check the sources below.

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