Haltech E8 - Manual (Page 88)

Haltech E11/E8 Instruction Manual
Prime
To aid in starting a cold engine, the prime map defines how much fuel to inject on the first cycle on
injections for each cylinder or rotor. The fuel injection opening times in this map are much larger than what
can be programmed in the base fuel maps. An A/F meter will not be very helpful in setting up this map
since the time that this map is used is so short. A process of trial and error is the easiest way to set this
map up. Simply increase the values in this map for the given temperature until the engine can be started
easily.
Figure 92 - Fuel Prime Map
Over priming the engine will cause it to flood and not start. To clear a flooded engine, open the throttle
fully and continuously crank the engine. Do not pump the throttle, as this will only worsen the problem.
Post Start
On some motors, in particular rotaries there may be a problem with vapour-lock (fuel which due to heating
of the fuel rail has vaporised). The additional fuel at start up allows the vapour in the fuel rail to be purged
through the injectors and also allow enough fuel to be injected into the motor to allow stable operation.
Post start can also be used to give extra enrichment when the engine is cold to assist drivability. When
used for this purpose, try to do the majority of your compensation using the coolant temp map and only
use the post start map after the coolant temp map is properly programmed.
The Post Start Map is accessed via the Maps menu. It covers a time of 128 seconds with each bar
corresponding to 4 seconds of time. The time starts after the RPM exceeds the Max Crank RPM.
In the Main Setup, a post start correction above the operating temperature, and below the operating
temperature are available. The operating temperature is also defined in the Main setup.
Seperate maps are available for both above the operating temperature and below the operating
temperature in the fuel correction maps page.
Page: 88 Copyright © Haltech 2008