Haltech Platinum Pro 350z - Manual (Page 38)

User Manual – Haltech 350Z
vehicle has been calibrated satisfactorily, then changing the target AFR will change the engine to operate
sufficiently close to the new AFR to only require minor tuning or checking. This is far quicker than the trial and
error method required when manipulating injection times directly.
Similarly, if injector sizing is changed, then a change to the injector flow and dead time parameters will adjust the
fuelling to suit the new injectors.
The tuning of the VE table is typically much easier than manipulating injection time because the values of the VE
table a typically very similar across an operating range of the engine. For example, the majority of engines have a
relative VE between 45% and 90%. This results in a map with a flatter shape than an injection time map.
To illustrate the effectiveness of VE tuning, it is often possible to use a single VE value of approximately 80%
across the entire table to get an engine started and running, assuming all the other parameters are correctly set up.
This reduces the set up time of the fuel maps to getting a car to a stage where the main tuning can begin.
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