Re: RS2 Injectors

["Scott Mo." <scottmo@teleport.com>]

Mark,

The high resistance injectors (15-17ohms) typically use a saturated switch
type transistor  driver in the ECU to ground the injector to turn it on.
(Injector has +12v supplied on the other lead). Usually the injector driver
has some sort of built in current limiting if one or more injector
winding(s) shorts out to prevent damaging the driver.

The low resistance injectors (3-4 ohms) use what is called a "Peak and
Hold" driver inside the ECU which provides a high initial "on" current
(4amps typically) to open the injector, then the driver reduces the current
down to about 1 amp to hold it open. 

If you used the low resistance "Peak/Hold" type injectors with an ECU
designed for the high resistance saturated switch type injectors, it would
likely cause current limiting in the ECU driver as if the driver thought
the injectors were shorted.

HTH

Scott Mockry

>Mark said:
>My price on these 993 units is $72/each.  Strangely enough, I may have >found
>some Mustang GT injectors which flow at 445 cc/min at 20#...still
>researching this.  The other problem is the amount of resistance on the
>nozzles.  The 200's nozzles run 15 - 17 ohms of resistance, while most other
>nozzles run 3 - 4 ohms (not sure what the S4/S6 nozzles are rated at).  I'm
>trying to get more information on these mustang units which may work, as
>well as the real RS2 nozzles through Hoppen.

Thanks,
-Mark