Injectors and resistors

[Bill the arcstarter]

Steve Lamb wrote:
>I need the assistance of and EE......

I suspect there *might* be one or two on this list... :)

>My next major project is to get an 808 ecm to drive a Nissan VG30DET
>engine.  This a 3L Quad Cam 24V single turbo engine.  We believe we 

Is that the engine found in the Maxima over here (USA)? (no flame)

>I'm reliably informed that the 808 will not drive 6 low impedance
>injectors.  One alternative would be to change the injectors, but this
>would add quite a bit to the cost.  Another possible alternative is to 
try
>what Nissan did with its early L-Jet based systems......use a resistor 
in
>series with each injector and thereby increase the total load (?) seen 
by
>the injector driver.

I haven't tried it but I'd guess that'd work.  Surely it would limit the 
peak current to the proper value.  However - the time for the injector 
to open will be extended.   Don't know if that will be a problems or 
not...

I'd suggest trying the resistor trick and watch for problems at idle 
(when the fuel delivery is low and I'd guess any problems would be 
revealed)...

If that doesn't work you could use any number of peak-and-hold injector 
driver chips to drive your 2.5 ohm injectors.  Roughly, you would 
connect the injector outputs from the 808 to the drive inputs of the P-H 
driver chips.  Someone recently posed the part number/URL of such a part 
from Cherry and/or Linear Tech...  Looks fairly straightforwards. 

Let me/us know if you need advice about doing this!

-Bill
'92 SR20DE (2L, 16v)

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