Air-Fuel Calibrator

[Rodney_L_Wiggins at keybank.com]

I used the Split Second ARC-2 to convert from flapper box to hot wire MFS.
Great for idle and WOT, but I still have some frustrating drivability problems
at part throttle. The ARC-2 is the same as the ARC-1 you mentioned but has 4
pots instead of two.  (low, mid, high, and throttle-opening enrichment) Forget
the ARC-1, even the ARC-2 doesn't have enough adjustment points.  If you value
your engine you should use a proper wide-band sensor and a chassis dyno. On my
car, one click +/-of the high adjustment knob changed a/f ratio  from 13/1 to
14.5/1  to 11/1.  Not a lot of room to be "close".  Trying to set the car up
with the ARC-2 and a standard O2 sensor was fruitless and frustrating, as well
as very hard on the engine.  I at least had a knock-alarm and automatic
knock-retard. These protected me from my own foolishness quite often.  They are
pretty expensive. Look into the Apex-i fuel controller. If they have an
application for your car it looks like a much better unit. Maybe someone on the
list has some experience with one of these. (I'd be curious also).
Hope this Helps,

Rod
86 944 Turbo, 2.5ltr dynoed at 390 hp 465 ft/lbs (without the nitrous)
69 Land Rover,  95hp on a good day.


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