In order to see a more precise percentage of fuel that is being adjusted in Evoscan I highly recommend changing the STFT, LTFT (Low, Mid, High) equations to this. O2 feedback= This is the same thing as STFT in Evoscan LTFT= Long term fuel trim- a stored value that the ECU has learned to do to reach that target. STFT= Short term fuel trim- what the ECU is doing right now to get as close to stoich (14.7:1) as possible, adding or subtracting fuel over the base fuel map to reach that target. Instead of sifting through 58 pages of newbs asking the same questions I figured I would "summarize" everything in one thread, with quotes from contributers from the old thread.įirst lets go over some common acronymns that will be associated with this evolution. The following values are RECOMMENDED and not exact to your application. You will need to make adjustments to that table as well.ĭO NOT attempt to scale your own injectors without a wideband. It is correlated to Coolant temp, so if your car starts fine when warm, but cranks forever when cold. There is also a table that controls the injector pulse width during crank. The only way to get any other voltage readings is to use an oscilloscope and a test rig with Evo fuel pressures. Note: These values are mainly only tuned in the 8-14.3V range. So keep that in mind when deciding on your Injector Size Scaling. I figured on average the Evo fuel pressure is about 35psi base, hence the small scalings for large injectors (I.e. I figure we could use a thread for injector scalings and latencies.
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