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The Terminator
Engine/Tuning
Self Tuning With SCT Pro Racer
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<blockquote data-quote="03cobra#2" data-source="post: 16459250" data-attributes="member: 52057"><p>Figured I would update this.</p><p></p><p>First issue I had was when the ecu pulls timing. In the stock tune it starts to pull timing at 100* intake temps and by the time you hit 150* it's pulling a total of around 4*.</p><p></p><p>Solution was to start pulling at 130* and ramp to 160*. My wot logs are showing I'm getting the full 21* now at still safe iat2 temps (edit: I think I'm going to back timing down to 20). I felt that running E85 its a safe bet to raise that a bit.</p><p></p><p>My part throttle issue I was having is good now as well. Just to recap I was getting a shake / Loss of power during certain part throttle driving. My logs showed that at 200-300 throttle position counts I am in boost (6-10psi) and still in closed loop with the ecu trying to maintain 1.0 lambda. My short term fuel trims was even showing the ecu was pulling 5-10% fuel to maintain 1.0 af.....not good.</p><p></p><p>Solution was to enable open loop starting at 200 to counts instead of 300 so that I go open loop pretty much right as I start seeing boost. That's solved the issue. Getting back on the road and data logging the same situation showed that when I was commanding .8-.9 lambda my wideband was showing about 5-10% rich. It seems that my maf curve needs a bit of adjustment in the 400-500 count range. All is good. It seems that 400-500 maf counts is the forgotten area sometimes. It sits between normal part throttle and wot.</p><p></p><p>It just goes to show you that most shops are not going to give you a great tune, but a good / acceptable tune. Can't wait to hit the dyno in the fall.</p></blockquote><p></p>
[QUOTE="03cobra#2, post: 16459250, member: 52057"] Figured I would update this. First issue I had was when the ecu pulls timing. In the stock tune it starts to pull timing at 100* intake temps and by the time you hit 150* it's pulling a total of around 4*. Solution was to start pulling at 130* and ramp to 160*. My wot logs are showing I'm getting the full 21* now at still safe iat2 temps (edit: I think I'm going to back timing down to 20). I felt that running E85 its a safe bet to raise that a bit. My part throttle issue I was having is good now as well. Just to recap I was getting a shake / Loss of power during certain part throttle driving. My logs showed that at 200-300 throttle position counts I am in boost (6-10psi) and still in closed loop with the ecu trying to maintain 1.0 lambda. My short term fuel trims was even showing the ecu was pulling 5-10% fuel to maintain 1.0 af.....not good. Solution was to enable open loop starting at 200 to counts instead of 300 so that I go open loop pretty much right as I start seeing boost. That's solved the issue. Getting back on the road and data logging the same situation showed that when I was commanding .8-.9 lambda my wideband was showing about 5-10% rich. It seems that my maf curve needs a bit of adjustment in the 400-500 count range. All is good. It seems that 400-500 maf counts is the forgotten area sometimes. It sits between normal part throttle and wot. It just goes to show you that most shops are not going to give you a great tune, but a good / acceptable tune. Can't wait to hit the dyno in the fall. [/QUOTE]
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