Haltech IG5 - Manual (Page 40)

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5.4.2 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.
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 THE CARS
HANDLING MAY BECOME UNSTABLE. ALL ROAD TESTING
SHOULD BE DONE AT LOW SPEED.