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How To Tune an Evo

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Old Oct 21, 2007, 12:22 PM
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your letting to many secrets out shhh!!!! jus kidding ive always wanted to know how to do this.... props great write up
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Old Oct 21, 2007, 12:29 PM
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good write up but i didnt understand anything you were just saying..
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Old Oct 21, 2007, 12:32 PM
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nicely done
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Old Oct 21, 2007, 12:36 PM
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I'm sure this will be useful when I pick up my evo this week. Thanks for the knowledge. Subscribed.
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Old Oct 21, 2007, 12:43 PM
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Originally Posted by SuPeRNeT View Post
This is by far the best how-to write up to date the only thing that i need to know is how the load, rpm traces through the fuel, timing map. Which load do i use load cal or the other load on evoscan?
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.
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Old Oct 21, 2007, 01:03 PM
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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.
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Old Oct 21, 2007, 01:09 PM
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Very nice write up.
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Old Oct 21, 2007, 01:17 PM
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what are the load cells, what do they mean, how are they used ?
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Old Oct 21, 2007, 01:22 PM
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thank you!
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Old Oct 21, 2007, 01:58 PM
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Originally Posted by LithiumX View Post
what are the load cells, what do they mean, how are they used ?
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.

Last edited by Jack_of_Trades; Oct 21, 2007 at 02:01 PM.
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Old Oct 21, 2007, 02:24 PM
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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 ?
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Old Oct 21, 2007, 02:40 PM
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One thing: NBO2 does a fantastic job near stoich
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Old Oct 21, 2007, 02:41 PM
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Now I just need to do this on my car. Thanks for all the info.
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Old Oct 21, 2007, 02:47 PM
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i was going to start a thread requesting how to start tuining the evo

thank you, subscribed
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Old Oct 21, 2007, 02:54 PM
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Originally Posted by LithiumX View Post
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 ?
Actually, any load cell can possibly get triggered. Say you downshift and when you let out the clutch you are in the 6k-7k range in the lower gear. You could be coasting at this rpm with very little load but if you decide to mash the gas again, you'll hit every cell between 0-220 as you ramp back up to redline before you need to shift again. My point is, you have to expect that every cell is going to be used eventually so its best to make educated guesses as to what timing advance that cell should be set at.

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.
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