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#1991 TOYOTA CELICA FUEL INJECTOR CONNECTOR DRIVERS#
#1991 TOYOTA CELICA FUEL INJECTOR CONNECTOR DRIVER#

The primary advantage of low impedance injectors is a shorter triggering time. The best way to determine impedance is to put a digital ohmmeter across the two electrical connections and see what it reads. The trend lately is to use high impedance types in most production cars. Most manufacturers have used both types at one time or another. There are some exceptions to this, notably the Bosch 803 injector used on the Porsche 944 turbo which is 4.7 ohms.

#1991 TOYOTA CELICA FUEL INJECTOR CONNECTOR DRIVER#

An injector operating on a saturated circuit driver typically has a reaction time of 2 milliseconds while a peak and hold driver typically responds in 1.5 ms. This slower time can somewhat decrease the usable operating range of the injector energized by this driver. Conversely, a downfall of a Saturated Circuit driver is that it has a slower response time (and closing time) than a peak and hold type. This means that the current flow in the driver and injector circuit stays low keeping the components nice and cool for long life. In general, if an injector has a high resistance specification (12-16 ohms) the ECU uses a 12 volt saturated circuit driver to control it. This type of driver works by supplying 12 volts to the injectors and the ECU turns it on and off to establish a fuel injector pulse. These are very inexpensive, simple, and reliable. Most domestic OE production EFI systems use an ECU with 12 volt Saturated Circuit drivers. Even though 6 amps may be available to operate the injector, the maximum it is allowed to reach is 2 or 4 amps, depending on the driver's current limit.

#1991 TOYOTA CELICA FUEL INJECTOR CONNECTOR DRIVERS#

The drivers also come in two values 4 amp peak/1 amp hold, and 2 amp peak/0.5 amp hold. This is substantial current flow and a Saturated Injector cannot handle it. How high? Using Ohms's Law we can calculate the current rating (12v/2 ohms = 6 amps). With this type of driver, 12 volts is still delivered to the injector, but due to the its low resistance, the current in the driver circuit is high. These require the extra kick from the higher current to keep the opening and closing time of the injector stable at the higher fuel flow rate. The Peak current is the amount required to quickly jolt the injector open, and then the lower Hold current rating is used to keep it open for as long as the ECU commands. Most high flow injectors are low resistance (2-5 ohms) and use a peak and hold driver to activate them. They are primarily used in aftermarket high performance systems. They are more expensive and complex than saturated circuit drivers, and are not generally used with domestic production ECUs. These type of injectors and drivers may also be called current sensing or current limiting.

High- 10 to 16 ohms (Saturated Circuit Drivers/Injectors) Low- 1.7 to 3.0 ohms (Peak and Hold Driver/Injectors) These are usually grouped in two categories: Injector impedance describes the electrical resistance of the solenoid windings. RC Engineering has the best calculators out there:ġ991-up 3000GT VR-4/ Dodge Stealth R/T TTġ989-up Eclipse/Laser/Talon Turbo/non-turbo

500cc per minute is approximately equal to 49lbs per hour which is equal to approximately 100hp.

So, if you were using the Impulse RS 322cc injectors in a 4 cylinder engine (with one injector per cylinder) the max power that the injectors could deliver fuel for would be about 249.6hp.Īll of these figures are assuming that you are running an average fuel pressure of ~43psi and at 90% duty cycle. This means that you need to multiply this rating by the number of injectors that are to be used. The power ratings discussed above are for each injector. So 30.6 pounds/hour multiplied by 2.04 gives a horsepower capability of 62.4hp - the same as we got from the cc/minute figure. To convert from pounds/hour to horsepower capability, multiply the figure by 2.04. Assuming a "normal" fuel density, the mass of the fuel in pounds per hour can be worked out by Dividing the cc per minute figure by 10.5.įor this injector, that gives a mass flow of 30.6 pounds/hour. If you want to be pedantic, it's the mass of the fuel (not the volume) which is the critical factor.

So, 322cc divided by 5 = 64hp maximum fuel flow with this injector. So, how much power is this injector good for? That depends on the air/fuel ratio that is used, but a good rule of thumb is to divide this flow figure by 5 to get a hp capability. Fuel Injector Spotters Guide and Information