When a manufacturer creates a timing map they build into it a big margin of error to cope with: adverse temperature ranges, minor faults & bad conditions. It is now possible to advance the timing if the throttle is wide open to give greater power or back off the timing when cruising at constant speed for improved economy.
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(Some manufacturers in the 2016 cheat software scandal have even created code to detect test conditions and run super lean to pass emissions limits.) So what does ECU remapping do?Įlectronic ignition allows the manufacturer to fine tune the economy at popular road speeds such as 30mph, 56mph and 70mph where most cars spend a large proportion of their time. The manufacturers are primarily concerned with meeting emissions regulations, and this has pushed the evolution of the engine and engine technology to new heights. With the improvements in Turbo chargers and injector technology, a very precise amount of control over fuelling and power output can be achieved. Now air temperature, engine speed, engine load and even control over turbo/wastegate control & fuel delivery rates means that precise management of the engine ignition timing is possible and you can achieve the maximum power output throughout the rev range. You ended up with a near perfect spark timing donly in a limited RPM band.Ī complete map of variables was entered into the ignition program and the preset timing would be read from a table. The electronic ignition system was born giving much finer control over fuel delivery and spark timing advance. This did a sufficiently good job, but for the most effective power you would need to vary the timing to a greater degree than a fixed ratio advance curve. It was clunky and mechanical but seemed to work reasonably well. The greater the RPM, the more the timing would advance.
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Then we'll reveal the hidden drawbacks and problems of getting your car remapped and how to ensure you are happy with the end result.īack in the good old days, the task of timing the ignition spark was performed by the mechanical distributor. This article will expose the secrets used to sell maps, show all the different options discussing the pros and cons of each.
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