Paul, throttle response of our peripheral port engines was very good on  the
ground and in the air, and at any point throughout the operating  range. No
discernible lag. No stumble with throttle advanced from  idle slightly or
full throttle when on short final, etc. so made it  very nice to fly. Idle
speed approx. 1000-1200 engine rpm. But we  had the throttle shaft and
plates located inside the rotor housing.  Although locating the throttles in
the rotor housings is probably  the optimum for response and idle speed, it
involves a lot of work.  Putting a slide or throttle-body with plates/shafts
just outboard of  port probably next best location.

Steve Beckham

As  I recall Mazda placed the injectors close to the P-port on the  Lemans
engine for throttle response reasons as it is very important  when road
racing.

http://www.rotaryeng.net/Mazda_R26B_US.pdf

Also it might be a  good idea to use a Megasquirt in this application.
The 555 system  and Tracy system has no provision for rapid engine
acceleration.

We did discuss it at one time by putting a special switch on the throttle
knob  to
temporarily enrich the mixture.

"Basically it is  short stroke pancake air cylinder mounted on the slide
throttle
knob  inside the cockpit with a small air hose connected to the back
side  of the diaphragm in the Tillotson type carb. The increased air
pressure
will inject an extra shot of fuel and open the supply  needle valve at the
same
time. When the knob is released the  diaphragm spring will slowly restore
the diaphragm
and close the  needle valve again.

Something like a 1 inch bore (2" OD)  cylinder with a .5 inch stroke
or smaller should do the job. A  spring inside the cylinder will restore the
stroke after the knob is  released. A one way valve on the intake port to
the cylinder
will  fill the cylinder with air."


Paul  Lamar


Paul and group,
Every racing and street EFI that I have encountered has a throttle
position sensor. The rapid opening of the throttle at low RPM should  automatically
enrichen the mixture. Since the injection is a demand system based  on RPM
of the pump, and the stroke or the time of opening the injector, the
throttle response should be better than any carb system. Airflow performance  type
systems use the differential between the servo pressure and the inlet
pressure to do the same thing. Hilborn style systems connect a valve directly to
the throttle shaft that does the same thing. (I know Paul knows this
already but  it should be built into any EFI system.) The basics of fuel
injection is so  intuitive that it is supprising that the carburetor came first.
Even a system  without a throttle position sensor should have programing
ability to richen  using the map sensor. Older alpha-n systems used only a TPS and
RPM with a  programmed fuel map. We are talking about making a injector
pump like used in a  carb. This shouldn't be needed in a EFI. Just my $0.02.
Bill Jepson