DeatschWerks 1200cc Fuel Injectors for B/D-Series

DeatschWerks 1200cc Top-Feed Fuel Injectors - Honda B-Series / D-Series

An injector can only flow so much fuel per minute. Once the engine needs more than that, the only way the ECU can add fuel is to hold the injectors open longer. At some point they're open nearly the whole time, close to 100% duty cycle, and there's no more fuel left to give. Add more boost after that and the engine goes lean, usually at the top of the rev range, where detonation is most likely to start. Factory B- and D-series injectors were sized for N/A power. A turbo build runs them out of headroom fast, and switching to E85 makes it worse, since it takes about 30% more fuel for the same power.

These DeatschWerks injectors flow 1200cc per minute, several times what the factory injectors do. That's big injector territory for a four-cylinder Honda. They make sense for a high-boost B or D build, or for an E85 car that needs headroom for both the power and the extra fuel. If you're running a small turbo on pump gas, you can get away with a much smaller injector. A smaller injector gives your tuner finer control at idle and cruise, too. Size injectors for the power you're going to make, not for the biggest number available.

Flow Matched to 1-2%

No two injectors flow exactly the same, and the difference matters. If one injector flows 5% less than the others, that cylinder runs 5% leaner at full throttle. The other three can be perfect, and that one cylinder still takes the hit. DeatschWerks matches each set to within 1-2% of each other and includes a flow report showing the numbers. Your tuner works with one fuel map for all four cylinders, and none of them is quietly running leaner than the rest.

What the Specs Mean for Tuning

These are Denso top-feed injectors with Sumitomo connectors. They're high impedance at 14.2 ohms, so most modern tuning setups can run them without a resistor box. The minimum pulse width is 1.1 milliseconds. That's the shortest time the injector can open and still deliver a consistent amount of fuel, and it's what decides how smoothly a big injector idles. They'll handle fuel pressure from 40 to 100 psi and a maximum duty cycle of 92%. The spray pattern is tuned for good atomization, which helps idle quality and keeps light-throttle driving clean. That's usually where big injectors are hardest to live with. DeatschWerks provides tuning data and phone or email tech support, so your tuner isn't starting from scratch.

What Else You'll Need

Injectors only spray what the fuel system gives them. A 1200cc set needs a pump that can keep up, and that's usually a DW420 or bigger. It also needs a fuel pressure regulator and lines that can handle the flow, plus an ECU or tuning platform that's set up for the new injector data. Plug these into a stock ECU without a tune, and the car will run dangerously rich. They come with a 3-year warranty.

Install Notes

Depressurize the fuel system before you pull the rail. Lube the new O-rings with clean engine oil, seat each injector straight into the rail and manifold, and make sure every one is fully seated before you tighten the rail down. Leak-check with the key on and the pump running before you start the car. Give your tuner the DeatschWerks injector data and the flow report. Don't let the car see boost until it's tuned for the new injectors.

Fitment

• Honda B-series engines, including Acura Integra LS, RS, GS, and GS-R
• Honda D-series engines, including Honda Civic CX, DX, EX, and Si
• Confirm your exact year and engine before ordering