Hondata CTR Fuel System Plus Injector set 1640cc
Introducing our high flowing FK8, FL5 and DE5 1640cc injectors, custom designed and proudly manufactured in the US. Elevate your performance with these high-quality injectors, providing a remarkable 55% increase in fuel delivery compared to the stock FK8 / FL5 / DE5 injectors. Stock starting with a smooth idle while preserving a stock like spray pattern. Take your Civic Type R and Integra-S fuel capabilities to the next level with this upgrade for unprecedented fuel delivery and efficiency.
- Four 1640 cc Hondata injectors (55% over stock)
- E85 compatible
- Stock like atomization
- Designed and manufactured in the USA
- Sold as a matched set of 4.
Increasing injector flow while maintaining atomisation requires countersinking the holes. Hondata replicated the stock injector hole design. Simply drilling a hole does not optimise fuel atomisation. (think firehose)
The injector fuel exit must be counter-bored stepped for optimal atomisation.
Hondata tested with a microfine grid under each injector to determine the fuel delivered to each segment.
Injector tips
- Stock injectors have 7 counter-bored holes
- Hondata 1427 injectors have 9 counter-bored holes
- The competitition have 6 counter-bored holes and 1 non counterbored.
Note the competitor injector spray cone and bend angle is smaller than stock.
| Injector | Cone angle 100 bar | Bend angle 100 bar |
| Stock FK8 | 52.1 | 20 |
| Hondata | 49 | 18 |
| Competition | 35.7 | 8 |
Stock injector atomisation 100 bar
Hondata 1640cc injector atomisation 100 bar
Competition injector atomisation 100 bar
Note the bulk of the spray is in the centre.
Fuel pressure
| Max operating pressure | 250 bar |
| Max sensor range | 260 bar |
Meaning, if you exceed 260 bar fuel pressure you wont know how much you over-pressureize. We've seen no powergains over 220 bar. Higher pressure improves atomisation but reduces fuel volume.
Injector lockup
When the fuel pressure is too high, the injector can lock up and stop delivering fuel. Fuel rails and pumps are very noisy as far as pressure waves are concerned. You might request 200 bar, but injector closing and pump operation can spike this to many bar higher. This pressure wave noise is too brief to be measured by the stock Honda fuel rail pressure sensor. Hondata injectors are designed to function between 200 and 240 bar (and a lot higher values). Higher pressures may improve atomisation but decrease fuel pump volumetric efficiency - as in your system delivers less fuel. (Read this Hondata test on in tank pumps) We have seen competing injectors lock up at 230 bar, which is bad for your engine.