Honda CRX Info

Wtryskiwacze OBD2 to wtryskiwacze high impedance pracujące w trybie: saturated
Wtryskiwacze OBD1 to wtryskiwacze low impedance pracujące w trybie: peak-hold
ECU OBD1 nie za dobrze współpracuje z wtryskiwaczami OBD2

Injectors

here are a few common injectors and there flow rates

All obd 1/2 B series are 240cc's saturated

All obd 1/2 D series are 240cc's saturated

1988-91 Civic si/crx si Peak and hold 240cc
1992-95 Civic si/ex Saturated 240cc
1996-00 Civic Saturated 240cc
1990-91 Integra Peak and hold 240cc
1992-00 Integra ls/gsr/type R Saturated 240cc
1992-96 Prelude non-vtec Peak and hold 240cc
1992-96 Prelude VTEC Peak and hold 345cc
1997-up Prelude VTEC Saturated 280cc
1991-up Sentra se-r/200sx se-r Saturated 265cc
1988-91 Supra Turbo Peak and hold 550cc
1993-up Supra Twin Turbo Peak and hold 550cc
1993-up RX-7 Twin Turbo Saturated 550cc/850cc
1991-up 3000GT VR-4 Peak and hold 350cc

Differences in Peak/Hold and Saturated type injectors:
Peak and hold is the OBD0 (pre-OBD) low impedence injector type which needs the resistor box in order to recieve the correct voltage.
Saturated is for OBD1 & OBD2 systems which do not need the use of the injector box.

You can use Peak and hold injectors on OBD1&2 systems if you use a resistor box.

There are two basic types of injectors that work on Honda and acura cars. How they operate are totally different. Let's take a look.

Peak and Hold:

Peak/hold injectors are low impedence, usually in the 1-4 ohm range. When the ecu calls for fuel to be injected, it sends out voltage via the wire clips until a certain current level is reached (the peak part) (varies by injector size, company). For the duration of 1 pulse width, that current is slightly reduced and held (the hold part).

Advantages of this design:
• minimizes the injectors "on" time, resulting in faster response
Disadvantages of this design:
• increases coil heat, which can lead to failure over time

Saturated:

Saturated injectors are generally higher impedence than peak and hold, running in about the 10-15 ohms range. Unlike peak/hold, a saturated injector remains "on" for the entire pulse width.

Advantages of this design:
• reduces heat
Disadvantages of this design:
• slower response time
• can't handel large CC or lb/hr styles due to limitations in its speed.

So, which should I choose?

There are a ton of factors involved in this.
• First, power level. If you're going big, there simply won't be a saturated injector that will support your power level. The largest common saturated injecotrs on the market are 550cc, with 440cc being a common "cap" in saturated size. Most boosted people run peak/hold setups for not only their availibilty, but also their ease of upgrading later on if so desired. simply swap the injectors. no need to re-wire again.
• How is your car wired? most obd0 civics and some preludes are wired for peak/hold and have a resisitor box already. No point in changing to a saturated. Obd1+2 civics, and most other honda/acura cars after 1992 are all saturated and are not wired with resisitor boxes. Again, if there is an injector availble in your power range for flow of your car's design type, there's little sense to change.
• Price. DSM eclipse/talon 450cc peak and hold injectors fit honda rails and with just a minor modification plug right in. best of all, these can be had for about $50-75 a set of 4 instead of $350+ for a set of aftermarket injectors. Add a $25 resistor box from an obd0 civic/crx, wire it up, and you're good to go in you're saturated car.

High horsepower boosted cars often need large injectors. Most large capacity injectors are available in peak and hold form - about 2 ohms impedance, whereas most stock injectors from about 92 on are saturated (8-10 ohms impedance). Honda engine computers require a total injector impedance of about 10 ohms so a resistor pack is needed whenever the stock saturated injectors are swapped with peak and hold.

Early model injected Hondas; 90-95 Prelude and Accord; 89-91 JDM B16A Hondas all ran external resistor packs with low impedance injectors.

This wiring diagram shows the wiring for saturated (upper), and peak and hold injectors (lower). The engine computer activates the injectors by grounding each injector in turn.

Converting to Peak and Hold injectors

Near the brake master cylinder on OBD I cars is a connector that distributes power to the injectors and a number of sensors. Verify with a multimeter which wires go to the injectors. Cut all 4 and connect the wires coming from the injectors to the resistor pack. Connect the power wire from the resistor pack to all 4 of the unused wires coming from the power connector. OBD II cars may have this connector somewhere under the intake manifold.