If you look down this list to the Toyota engine
4ME 5ME and 5MEG with the 2.4 ohm 36 pound injector I am
willing to bet that is the same one Mazda uses.

If Tracy's EFI is designed to use the high impedance (13.8 ohms)
version that is probably the one up a bit in the table  for
the Toyota 4AFE engine. That one is also 35 pounds.

It is waste of electrical power to put a five ohm resistor
in series with the injector coil.  There are
some injector driver chips that handle the peak
and hold low impedance injectors. 

I think the Harris Semi HTP14N40F3VL could be one of them.
Also National Semi LM1949.
Cherry Semi CS-452 and CS-453.

While searching I also found the Harris Semi HIP9010 knock 
sensor signal processor. More on that later.

Paul Lamar

***************************************************************************
"Regarding peaking and hold in general ...

The IC's that are currently available on the open market are (probably) silicon
built to a specific manufacturers (ie. Delco, Ford or Chrysler).  Ford does but
IC's from both Motorola and Cherry (I don't know which from whom).  The benefits
you list were the reasons for this type of driver.

I think we (Ford) have now switched completely to "high" impedance injectors
(ie. >= 12 ohms) which only draw a nominal 1 amp and don't require the peak and
hold drivers.  Power MOSFET are only recently being used because in the past
they were too expensize.

Jack Patteeuw"
******************************************************************************


 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2002 All world wide rights reserved.