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LS 80lb Injectors: When Your LS Build Is Ready for Real Fuel

Posted by donald blatz on

You can only lean on stock injectors for so long.

Once you add boost, cam, E85, or big power goals, fuel delivery becomes the thing that either makes the combo… or melts it.

That’s where LS 80lb injectors come in. They’re the sweet spot for a lot of turbo and supercharged LS builds—big enough to support serious power, but still streetable when your tuner knows what they’re doing.

In this guide, we’ll break down what LS 80lb injectors actually are, when you really need them, and how to choose and tune them the right way.

What Are LS 80lb Injectors?

“80lb injectors” usually means a fuel injector that can flow around 80 lb/hr, which translates to roughly 800–840 cc/min, depending on the fuel pressure. Precision Auto InjectorsTREperformance

Most modern LS 80lb injectors used in performance builds are:

  • High-impedance (works with factory-style ECUs and most stand-alone systems) Texas Speed+2TREperformance+2

  • Designed with multi-orifice tips for better atomization and cleaner idle than old-school “pencil stream” big injectors Texas Speed

  • Built to handle higher fuel pressures commonly used in boosted applications

At High Performance Injectors, LS 80lb sets are professionally cleaned, tested, and matched before they ship, so each cylinder is seeing as close to the same fuel as possible. High Performance Injectors

When Do You Actually Need LS 80lb Injectors?

Most people jump to “bigger is better,” but injector sizing should match your power level, fuel type, and goals.

LS 80lb injectors are a great fit when:

  • You’re targeting roughly 600–750+ wheel horsepower on gasoline or a bit less on E85 (since E85 needs more volume). Precision Auto InjectorsTREperformance

  • You’re running turbo, supercharger, or nitrous and want headroom instead of leaning on 60s at 100% duty cycle.

  • You’re swapping from pump gas to E85 or flex-fuel, and your current injectors can’t keep up.

  • You want a future-proof setup so you don’t have to re-buy injectors every time you add more boost.

If you’re building a mild cam-only 450 hp street car, LS 80lb injectors are probably overkill. But if you’re in the “turned up on Friday nights / lives at the drag strip” category? They’re right in the zone.

Why LS 80lb Injectors Work So Well in LS Builds

Modern 80lb injectors use newer designs (Bosch EV14 / DEKA-style, etc.) that deliver a high flow rate without trashing idle quality. They remain controllable at low pulse widths, especially when they’re characterized correctly in the tune. Texas Speed Speed Engineering

Paired with a good tune, LS 80lb injectors give you:

  • Clean idle and cold starts instead of loading up or fouling plugs

  • Better fuel distribution between cylinders thanks to matched flow sets

  • Consistent fueling under boost so you’re not playing “which cylinder melts first”

That’s exactly why you see LS 80s recommended over older, generic “big injectors” that idle like garbage and fight the tuner the whole time.

LS 80lb Injectors and E85: A Perfect Match (When Tuned)

E85 is awesome for boosted LS builds—more knock resistance, cooler charge temps, and room for more timing. The catch? You need about 30% more fuel for the same power compared to gasoline. TREperformance

That’s another reason LS 80lb injectors shine:

  • Plenty of flow for E85 turbo / blower setups

  • Materials and internals designed to handle ethanol-based fuels

  • Still tunable for part-throttle drivability when characterized properly

If you know E85 is in your future, skipping straight to an LS 80lb set often makes more sense than buying 60s now and upgrading again later.

How to Know If LS 80lb Injectors Are the Right Step

A simple way to think about it:

  • Staying under ~550 hp on pump gas? 42–60 lb injectors may be fine.

  • Pushing 600–750+ hp or switching to E85? LS 80lb injectors start to look very smart.

  • Going full send four-digit power? You’ll probably end up in 120–220 lb territory instead.

If you’re on the fence, you can cross-link to your other sizing content and let buyers self-educate:

  • Want a deeper look at injector sizing in general? Check out “What You Need to Know Before Purchasing Fuel Injectors” on the High Performance Injectors blog for a solid overview. High Performance Injectors

Q&A: Will LS 80lb Injectors Make My Car Run Rich at Idle?

Q: I’ve heard big injectors make cars idle like trash. If I upgrade to LS 80lb injectors, will my car run rich or rough at idle?

A: That used to be true with older designs. Modern LS 80lb injectors are a different story.

Today’s 80lb injectors are:

As long as your tuner uses correct injector data and sets the fuel tables properly, LS 80s can idle surprisingly well—even on street-driven cars. If the car idles terrible after the swap, it’s usually a tuning issue or a mechanical problem elsewhere, not the injectors themselves.

Why Buy LS 80lb Injectors from High Performance Injectors?

There are a million places online to buy “80lb injectors,” but not all of them are actually tested or consistent.

At High Performance Injectors:

  • Sets are professionally cleaned, ultrasonically serviced, and dynamically flow tested

  • Injectors are matched into sets so each cylinder gets similar fueling

  • You’re working with a shop that specializes in LS builds, drag racing, and boosted combos, not a random reseller High Performance Injectors High Performance Injectors+2

 

Ready to Step Up to LS 80lb Injectors?

If your LS build is creeping into serious power territory, your injectors need to be just as serious.

LS 80lb injectors give you:

  • Room to grow into more boost and power

  • Compatibility with E85 and race fuels (with the right setup)

  • Modern injector tech that still idles and cruises clean when tuned correctly

👉 Upgrade your LS with professionally tested LS 80lb injectors from High Performance Injectors and give your engine the fuel system it deserves.

💥 At checkout, use code Turbo for 10% Off qualifying injector sets at
HighPerformanceInjectors.com

Fuel it right. Turn it up. Don’t starve your build.

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