I went to some of the RX 7 groups online to find out the best way to control
FI.  I am looking at Megasquirt as a plan B or C if the 555 analog system does
not work out.  I guess there is manifold pressure which is not stable on a P
Port.  Ther is  Mass air flow which is being proposed for the 555 system and is
supported by Megasquirt.  The RX 7 guys seem to think the MAF sensor could
impead the air flow to make big horse power.  200 to 250 HP does not seem to be
big HP when they are getting a lot more out by turning the engine faster.  How
does TPS or throttle position sensor fit into this?  Thanks for any help

Joe Berki
Limo EZ 13b P Port



As long as the mass airflow sensor is around 5.5 square inches it should be fine.
That is something about 2.625 or 2.75 inches in diameter will give around
250 HP. The throttle position sensor will not work with the 555 system
not is it needed.
--Paul

Paul

How would the  mass flow sensor work with a turbo charger on the front
end?  I Think that the MAF sensor would be calibrated for ambient
pressure N/A applications.

Doug in Japan

The 555 system has a provision for scaling the airflow signal.
The gain of the op amp can be adjusted.
It responds to mass flow only and not pressure per se.

Paul Lamar