[Ronny]

Nabend,

ich habe gerade noch ne schöne beschreibung bei MSD gefunden:

Saturated Circuit Drivers/Injectors
Most domestic OE production EFI systems use an ECU with 12 volt Saturated Circuit drivers. These are very inexpensive, simple, and reliable. 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. 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 means that the current flow in the driver and injector circuit stays low keeping the components nice and cool for long life.
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 slower time can somewhat decrease the usable operating range of the injector energized by this 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.
MSD offers two higher flow injectors that are designed primarily for quick response time with a 12 volt saturated circuit driver. The PN 2018 Injector is rated at 38 lb/hr with 12 ohms and the PN 2013 is a 50 lb/hr, 12 ohm injector.

NOTE: You can measure an injector's resistance with a Digital Volt-Ohm Meter(DVOM) by connecting it across the injector's electrical plug contacts.
NOTE: Ohm's Law can be applied to calculate the current in the injector and driver circuit when using a high resistance injector like the PN 2018 (38 lb/hr static flow, 12 ohm). Remember, Ohms's Law is I = E/R, where I = the circuit's current in amps, E = battery voltage in volts available to the injector, and R = injector resistance in ohms. So, for our 12 ohm injector being supplied 12 volts, I = 12v /12 ohms, which is 1 amp of current in the circuit to operate the injector.

Peak and Hold Driver/Injectors
These type of injectors and drivers may also be called current sensing or current limiting. They are more expensive and complex than saturated circuit drivers, and are not generally used with domestic production ECUs. They are primarily used in aftermarket high performance systems.
Most high flow injectors are low resistance (2-5 ohms) and use a peak and hold driver to activate them. 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. 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.
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. How high? Using Ohms's Law we can calculate the current rating (12v/2 ohms = 6 amps). This is substantial current flow and a Saturated Injector cannot handle it.
The drivers also come in two values; 4 amp peak/1 amp hold, and 2 amp peak/0.5 amp hold.. 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. Note that the MSD PN 2014 (72 lb/hr, 2 ohm) and PN 2015 (96 lb/hr, 2 ohm) injectors require a 4/1 amp driver.


Was haltet ihr überhaupt qualitativ von den Einspritzdüsen diverser US Firmen? (sprich Holley, MSD etc.)

Ich habe da persönlich rein "null" erfahrung, habe aber auch schon desöfteren negative erfahrungen mit manch so hochgelobten "auslandsteil" machen dürfen.
Kann man bei solchen Firmen zugreifen oder sollte man eher auf Bosch etc. zurückgreifen? Gewissensfrage?

Gruß
Ronny