What size injectors does a 2001 LS1 need to run E85?
Fit 42 lb/hr injectors and a higher-flow pump. The proven naturally-aspirated E85 setup is 42 lb/hr injectors — they flow about 50 lb/hr at 58 psi and run around 85-90% duty on a mild LS1 — with 60 lb/hr for cammed or higher-power builds. Set stoich to ~9.8 and tune in lambda.
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Who this applies to
- Computers: P01
- Engines: LS1
- Transmissions: 4L60E, T56
- Years: 2001-2002
- Not for: 1999-2000 LS1 (26.4 lb/hr stockers); 1998 LS1 (28.6 lb/hr)
Naturally aspirated / mild bolt-ons
- Enter the injector maker's full characterization — flow rate vs kPa, offset, short pulse — before touching any fuel table. full injector data first
- Upgrade the in-tank pump and service the filter; replace questionable rubber fuel line — E85 needs 30-40% more volume and old rubber is not ethanol-safe. 30-40% more fuel volume
- Set stoich AFR for E85 (~9.83) and tune in lambda; verify duty cycle stays under 80-85% at WOT. stoich ~9.83; duty <80-85%
Cammed / higher-power
- Step up to 60 lb/hr injectors (Siemens 60# units flow ~69 at 58 psi). 60 lb/hr (~69 at 58 psi)
- Same supporting work: full injector data, bigger pump, fresh filter, ethanol-safe lines.
- Set E85 stoich and retune VE/MAF in lambda; budget extra time for cold-start enrichment on E85. stoich ~9.83
Careful
- Make sure you have plenty of injector for the switch — fuel demand on E85 is far higher than gasoline, and undersized injectors go lean at full power.
- Never assume pump-gas stoich on E85 — set ~9.8 and tune in lambda, or every fueling calculation is wrong.
More in fuel, E85 & boost, or build a checklist for your swap with the tune checklist tool.
Go deeper
Check this first
- Log injector duty cycle at WOT on gasoline; if it is already near 80%, the stockers have no headroom for E85's ~30% higher demand.
- Confirm the rail holds 58 psi under load before sizing anything — a weak pump mimics undersized injectors.
Try this, then this
- Size the injectors first: 42 lb/hr for NA/mild, 60 lb/hr for cammed or higher power. — E85 needs ~30% more fuel and the stockers are already near their limit on gasoline. Worked if: Duty cycle at WOT lands under 85% on E85.
- Enter the maker's injector data (flow vs kPa, offset, short pulse) before touching any fuel table. — Every fueling calculation builds on injector data; tuning around wrong data never converges. Worked if: Trims stay near zero after the swap with no VE changes.
- Set E85 stoich and retune VE/MAF in lambda; adjust cold-start enrichment. — A stoich error shifts every fueling calculation, and E85 cold starts need more fuel. Worked if: Lambda 1.0 at cruise and commanded PE at WOT.
How you know it's fixed
- Duty cycle stays under ~80-85% at WOT on full E85 with fuel trims near zero.
- No lean spikes on tip-in; cold starts behave after the cold-start tables are adjusted for ethanol.
Key numbers
| What | Value |
|---|---|
| Stock 2001-2002 LS1 injector size | 28.8 lb/hr |
| Stock LS1 rail pressure | 58 psi |
| E85 fuel volume increase over gasoline | 30-40% |
| 42 lb/hr injector flow at LS rail pressure | ~50 lb/hr at 58 psi |
| Observed duty cycle, 42# injectors on mild LS1 E85 | ~85-90% IDC |
| Injector duty cycle ceiling | below 80-85% |
| E85 stoich starting point | ~9.83 |
Every option we know of
| Maker / product | Part # | Fits | Price | Where | Status / notes |
|---|---|---|---|---|---|
| Ford Racing SVO 42 lb/hr 'green tops', high-impedance EV1 | EV1 connector; needs published offset/short-pulse data | Discontinued / used only discontinued new; used sets should be cleaned and flow-tested | |||
| Siemens Deka 60 lb/hr high-impedance injectors | EV1; stock LS1 rail height | aftermarket retailers | In production needs full injector data entered in the tune | ||
| Bosch EV14 42 lb/hr (440cc) E85-compatible injectors | verify height and connector against the 2001 rail | aftermarket retailers | In production confirm EV1 vs USCAR connector with adapters if needed |
Prices are approximate as of September 2026. We list every option we know of, including small shops and used parts we can't link to. Confirm fitment with the seller.
Time and cost: A set of injectors, a pump, and a retune; plan a weekend plus tuning time.
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