How To Tune an Evo
#20
Evolved Member
iTrader: (17)
Currently, most guys either follow the log graph on evoscan or open it up with Excel to see which load cells are being hit at certain RPM's. Hamish (creator of Evoscan) is currently finishing up his MapTracer updated software which will do it all for us and simply highlight the cell blocks in the Fuel/ignition maps that were actually used during your log session. Life just keeps getting easier and easier,lol.
#21
Evolved Member
iTrader: (55)
Great job NJ...it seems like alot at first but once you get into it all the features, cells, etc start to make sense and your tuning is alot quicker and effective.
Practice makes perfect.
Just one thing. On the boost cut, i believe that is from Maf air flow and not boost.
Practice makes perfect.
Just one thing. On the boost cut, i believe that is from Maf air flow and not boost.
#25
Evolved Member
iTrader: (17)
The ECU determines how much of a load is being put on the engine at any particular RPM via multiple sensors. Each rpm increment has a row of "cells" ranging from 0 to 260. When the engine load falls into one of these cells, the ECU changes its parameters depending on the information entered into that cell. If you tell it to advance ignition timg to 8 degrees in that particular cell, the ECU will attempt run 8 degrees ingnition advance (unless it sees knock, then it will alter the setting to try and eliminate the knock). It does the exact same thing for Fuel cells too. The values in the fuel cells aren't the EXACT air/fuel ratio's the car will achieve though so don't wig out if they seem to be different from your actual values with a wideband O2 sensor.
This isn't the best explanation, just the first words that came to my mind.
This isn't the best explanation, just the first words that came to my mind.
Last edited by Jack_of_Trades; Oct 21, 2007 at 02:01 PM.
#26
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Join Date: Aug 2007
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thx actually clears it up a bit for me, so change in boost etc would change the load and i guess some load cells are never activated hence the 30* timing at 6-7k < 100 load ?
#30
Evolved Member
iTrader: (17)
Evoscan has a nice feature called "interpolation". If you KNOW what the timing should be at a lower load cell, and you also KNOW what it should be at a higher load cell, you simply highlight the lowest cell,highest cell, and everything in between. Then you go to the FILE menu and interpolate the highlighted area. Evoscan adjusts all the cells in between so its a smooth transition from the lowest to the highest. Its a great feature to get you in the ballpark quickly.