Guide to injector sizes

Injector Size Reference Guide

Upgrading injectors often raises the same questions:

  • Which injector size should I choose for my engine?

  • How much horsepower can a single injector support?

  • What injectors do others use at similar power levels?

  • Is there a complete list of injector capacities?

This guide gives you a clear overview of injector flow rates and the horsepower they can support at 3 bar base fuel pressure. Calculations assume turbocharged engines with 90% duty cycle (leaving 10% margin).

If you’re close to the limit of an injector, you can either:
✔ Step up to the next injector size
✔ Increase your base fuel pressure for additional safety margin

The lists are divided by Gasoline vs. E85 and grouped by engine type: 4, 5, 6, or 8 cylinders.

Single Injector Reference (per cylinder, 3 bar, 90% duty cycle)

Gasoline

  • Up to 37 hp – Bosch 280cc

  • Up to 49 hp – Bosch 373cc

  • Up to 57 hp – Bosch 968 Green 465cc (430cc)

  • Up to 72 hp – Bosch 550cc

  • Up to 83 hp – Bosch 630cc / Siemens Deka 630cc

  • Up to 115 hp – Bosch 870cc / Siemens Deka 875cc

  • Up to 129 hp – Bosch 980cc

  • Up to 157 hp – Bosch 1200cc

  • Up to 197 hp – Bosch 1500cc

  • Up to 224 hp – Bosch 1700cc

  • Up to 290 hp – Bosch 2200cc (incl. High-Ohm NGI2)

E85

  • Up to 32 hp – Bosch 280cc

  • Up to 43 hp – Bosch 373cc

  • Up to 49 hp – Bosch 968 Green 465cc (430cc)

  • Up to 63 hp – Bosch 550cc

  • Up to 72 hp – Bosch 630cc / Siemens Deka 630cc

  • Up to 99 hp – Bosch 870cc / Siemens Deka 875cc

  • Up to 112 hp – Bosch 980cc

  • Up to 137 hp – Bosch 1200cc

  • Up to 171 hp – Bosch 1500cc

  • Up to 194 hp – Bosch 1700cc

  • Up to 251 hp – Bosch 2200cc (incl. High-Ohm NGI2)

4-Cylinder Turbo Engines (per cylinder injector, 3 bar)

Gasoline

  • Up to 150 hp – Bosch 280cc

  • Up to 200 hp – Bosch 373cc

  • Up to 230 hp – Bosch 968 Green 465cc (430cc)

  • Up to 290 hp – Bosch 550cc

  • Up to 330 hp – Bosch 630cc / Siemens Deka 630cc

  • Up to 460 hp – Bosch 870cc / Siemens Deka 875cc

  • Up to 520 hp – Bosch 980cc

  • Up to 630 hp – Bosch 1200cc

  • Up to 790 hp – Bosch 1500cc

  • Up to 900 hp – Bosch 1700cc

  • Up to 1160 hp – Bosch 2200cc (incl. High-Ohm NGI2)

E85

  • Up to 130 hp – Bosch 280cc

  • Up to 170 hp – Bosch 373cc

  • Up to 200 hp – Bosch 968 Green 465cc (430cc)

  • Up to 250 hp – Bosch 550cc

  • Up to 290 hp – Bosch 630cc / Siemens Deka 630cc

  • Up to 400 hp – Bosch 870cc / Siemens Deka 875cc

  • Up to 450 hp – Bosch 980cc

  • Up to 550 hp – Bosch 1200cc

  • Up to 690 hp – Bosch 1500cc

  • Up to 770 hp – Bosch 1700cc

  • Up to 1000 hp – Bosch 2200cc (incl. High-Ohm NGI2)

5-Cylinder Turbo Engines (per cylinder injector, 3 bar)

Gasoline

  • Up to 180 hp – Bosch 280cc

  • Up to 250 hp – Bosch 373cc

  • Up to 280 hp – Bosch 968 Green 465cc (430cc)

  • Up to 360 hp – Bosch 550cc

  • Up to 410 hp – Bosch 630cc / Siemens Deka 630cc

  • Up to 570 hp – Bosch 870cc / Siemens Deka 875cc

  • Up to 640 hp – Bosch 980cc

  • Up to 790 hp – Bosch 1200cc

  • Up to 990 hp – Bosch 1500cc

  • Up to 1120 hp – Bosch 1700cc

  • Up to 1450 hp – Bosch 2200cc (incl. High-Ohm NGI2)

E85

  • Up to 160 hp – Bosch 280cc

  • Up to 210 hp – Bosch 373cc

  • Up to 240 hp – Bosch 968 Green 465cc (430cc)

  • Up to 310 hp – Bosch 550cc

  • Up to 360 hp – Bosch 630cc / Siemens Deka 630cc

  • Up to 490 hp – Bosch 870cc / Siemens Deka 875cc

  • Up to 560 hp – Bosch 980cc

  • Up to 680 hp – Bosch 1200cc

  • Up to 860 hp – Bosch 1500cc

  • Up to 970 hp – Bosch 1700cc

  • Up to 1250 hp – Bosch 2200cc (incl. High-Ohm NGI2)

6-Cylinder Turbo Engines (per cylinder injector, 3 bar)

Gasoline

  • Up to 220 hp – Bosch 280cc

  • Up to 290 hp – Bosch 373cc

  • Up to 340 hp – Bosch 968 Green 465cc (430cc)

  • Up to 440 hp – Bosch 550cc

  • Up to 500 hp – Bosch 630cc / Siemens Deka 630cc

  • Up to 690 hp – Bosch 870cc / Siemens Deka 875cc

  • Up to 770 hp – Bosch 980cc

  • Up to 950 hp – Bosch 1200cc

  • Up to 1180 hp – Bosch 1500cc

  • Up to 1340 hp – Bosch 1700cc

  • Up to 1740 hp – Bosch 2200cc (incl. High-Ohm NGI2)

E85

  • Up to 190 hp – Bosch 280cc

  • Up to 250 hp – Bosch 373cc

  • Up to 290 hp – Bosch 968 Green 465cc (430cc)

  • Up to 380 hp – Bosch 550cc

  • Up to 430 hp – Bosch 630cc / Siemens Deka 630cc

  • Up to 590 hp – Bosch 870cc / Siemens Deka 875cc

  • Up to 670 hp – Bosch 980cc

  • Up to 820 hp – Bosch 1200cc

  • Up to 1030 hp – Bosch 1500cc

  • Up to 1160 hp – Bosch 1700cc

  • Up to 1500 hp – Bosch 2200cc (incl. High-Ohm NGI2)

8-Cylinder Turbo Engines (per cylinder injector, 3 bar)

Gasoline

  • Up to 290 hp – Bosch 280cc

  • Up to 370 hp – Bosch 373cc

  • Up to 450 hp – Bosch 968 Green 465cc (430cc)

  • Up to 580 hp – Bosch 550cc

  • Up to 660 hp – Bosch 630cc / Siemens Deka 630cc

  • Up to 910 hp – Bosch 870cc / Siemens Deka 875cc

  • Up to 1030 hp – Bosch 980cc

  • Up to 1270 hp – Bosch 1200cc

  • Up to 1580 hp – Bosch 1500cc

  • Up to 1790 hp – Bosch 1700cc

  • Up to 2320 hp – Bosch 2200cc (incl. High-Ohm NGI2)

E85

  • Up to 250 hp – Bosch 280cc

  • Up to 340 hp – Bosch 373cc

  • Up to 390 hp – Bosch 968 Green 465cc (430cc)

  • Up to 500 hp – Bosch 550cc

  • Up to 570 hp – Bosch 630cc / Siemens Deka 630cc

  • Up to 790 hp – Bosch 870cc / Siemens Deka 875cc

  • Up to 900 hp – Bosch 980cc

  • Up to 1100 hp – Bosch 1200cc

  • Up to 1370 hp – Bosch 1500cc

  • Up to 1550 hp – Bosch 1700cc

  • Up to 2000 hp – Bosch 2200cc (incl. High-Ohm NGI2)

✅ With this complete overview, you can quickly match your injector setup to your engine, fuel type, and horsepower goals.