Perry Mick wrote:

I think the stock '86 na fuel injectors are something like 440 cc/min?
And the '87 turbo are higher, like 550? And low-impedence (since they
have ballast resistors)?

I needed some replacement fuel injectors for my '86 NA RX-7 so I put the
higher flow rate injectors I had from a turbo engine in the two
secondary positions. It is working, but I guess my question is, does
anyone have cross-reference numbers from the RX-7 various models/years
to a generic Nippon Denso part numbers? My guess is if you could buy
these by OEM part number, they would be cheaper than the inflated Mazda
price.

Also, I know my plane engine runs rich at RPMs above 4000 (stock ECU). I
think Mazda does that purposely for best power acceleration in the car.
Since the secondary fuel injectors only kick in at high RPM, I'm
thinking of running lower flow-rate injectors than stock in the
secondaries in the plane. I would maybe loose some power in climb but
would get better fuel economy in cruise. Any comments on that idea? Thus
a complete list of fuel injectors that would fit the stock RX-7 fuel
rails with various flow rates would be of interest to me, if anyone has
this data.

Perry

Hard to trick that stock fuel injector computer into running lean.
What does the signal look like coming out of the mass air flow
sensor? Can you put a voltage divider pot on it and trick the computer
into thinking it is getting more air than it really is?

Paul Lamar

Opps. Make that:
"Can you put a voltage divider pot on it and trick the computer
into thinking it is getting LESS air than it really is?"

Paul Lamar

That wouldn't be too difficult. I was also going to feed in a fake water
temp. Haven't gotten around to any of that. I thought a reduction of
flow on the secondary injectors would be something easy to try. Of
course it would not allow for adjustment.

Perry

 
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