Haltech E8 - Manual (Page 82)

Haltech E11/E8 Instruction Manual
Full load tuning should be approached with caution. An engine at full load that is too lean may begin to
detonate and cause damage to engine components. Before loading the engine, increase the heights of
the right-most bars so that they are higher than the line projected by drawing a straight line from the idle
and free-rev settings and through the part-load settings.
On the Road
Tuning on the road is similar to tuning on the dynamometer, but with hills, acceleration, gear-ratios and
brakes providing the necessary retarding force. Although it is harder to maintain constant load and speed,
it is still possible to use the same procedure used on the dyno. It will be necessary to have one person
drive while another does the tuning.
Load the engine by selecting an appropriate gear and either driving up a constant grade hill, applying the
brake or handbrake.
Fine Tuning the Engine
When fine-tuning the engine for the road, the same principles apply to all engines. Under full load at all
rpm the fuel mixture should be rich. On naturally aspirated cars, an air to fuel ratio of around 12.5:1 to
13.5:1 is usually best. On forced induction vehicles (turbo or supercharged), the air to fuel ratio may go as
rich as 10.5 but should not be leaner than approximately 12.5. Forced induction vehicles may make more
power with leaner mixtures, but the excessive combustion chamber heat may cause damage to engine
components.
When cruising (light to medium load) the mixture should be as close to stoichiometric (best mixture) as
possible and decelerating conditions may allow the engine to be run lean to save fuel. This will result in a
particular shape for the map.
Note: All maps for all engines should be smooth. A map with a "lumpy" curve is most likely wrong. If,
when you have finished tuning, the map does have lumps in it, try to make it visually smooth.
Using the Haltech Quicktune Feature
The Haltech Quicktune feature can be used only if the ECU has a calibrated wideband O2 Sensor input
setup. The calibrated wideband O2 input will be the output of an external wideband O2 sensor product
such as the Haltech wideband O2 controller, other wideband controllers that have a 0-5V calibrated output
are also acceptable (INNOVATE, FJO, AFX, M&W Ignitions, TECH-EDGE and many other Wideband O2
controllers have this capability).
Once an auxilary input has been correctly setup and calibrated with a wideband O2 sensor input (go to the
setup menu -> sensor setup -> calibrate sensors -> wideband O2 controoler, to adjust the wireband O2
sensor calibration) the target air to fuel ratio table can be setup. This map is found in the maps menu
under target AFR map:
Page: 82 Copyright © Haltech 2008
WARNING
Be very careful using the brake to load the engine. The brakes can get very hot
and suffer from brake fade (reduced braking capability) and vehicle control may
become unpredictable. All road testing should be done at low speed.
Road tuning should only be performed on a closed track or private road.