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a .025 to .035 inch orifice in the MAP sensor line to help average and stabilize the vacuum seen by the
SDS computer. This orifice should be inserted close to the manifold/ throttle body connection.
Acceleration Pump (ACC Pump)
You must have a TPS installed to have this function active. If you don’t have a TPS on the engine set the
two Accpump Hi & Lo Rpm values to zero and Accpump sense to 1. ACC PUMP values help give
smooth throttle response when the throttle is opened quickly. There are three adjustments to make for
the acceleration pump. Adjustment should be done when the engine is at normal operating temperature.
ACCS.JPG ACCL.JPG ACCH.JPG
The ACCPUMP LO RPM value controls action from 0 to 1800 rpm. With the engine idling, quickly open
the throttle. If the engine hesitates, change the value. If the hesitation is worse, you have changed the
value the wrong way. Find the value that gives the best, quick throttle response.
Next is to adjust the ACC PUMP SENSE. This is very important just out of the idle range. Set this control
by opening the throttle slowly from the idle position. Adjust for the smoothest acceleration. 1 is least
sensitive, 8 is most sensitive. Usually 5 or 6 is best for most applications.
The ACCPUMP HI RPM setting controls action above 1800 rpm Snap the throttle open quickly above
1800 rpm. If the engine hesitates, change the value. If the hesitation is worse, you have changed the
value the wrong way. Repeat this procedure until engine response is acceptable.
Acc pump values are generally between 5 and 50 on most applications. The ACCPUMP LO RPM is
usually a higher value than ACCPUMP HI RPM.
Engine Temperature (ENGINE TEMP, ET)
There are 32 ranges under this parameter which determine the amount of extra fuel injected to
compensate for a cold engine during warmup. Liquid cooled engines use a water temp sensor and air
cooled engines use a cylinder head temp sensor to supply a signal to the EM-6. The function of this
parameter is similar to a choke on a carburetor.
You should aim for a 0 value when the engine is at normal operating temperature. Most engines will not
require extra fuel after 100-140 degrees F. The values should decrease in a fairly linear fashion from cold
to operating temperature then have 0's entered above this threshold. Temperatures can be displayed in
F or C.
As a reference, a value of 127 would add 50% to the pulse width and a 255 entered will double the pulse
width.
By flicking back between Gauge 1 mode and ENGINE TEMPERATURE you can make adjustments while
the engine is warming up. Each time the ECU updates to a new ET in gauge mode, you can go to that
ENGINE TEMPERATURE range in the programmer. Turn the knob richer and leaner and note where the
engine starts to run rough on each side of 12 o’clock. If it runs rough say at 10 and 2 o’clock, you
probably have the engine temp values about right. If not, adjust the ENGINE TEMP value at the engine
temp displayed currently in Gauge1 mode.
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