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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: 16456998" data-attributes="member: 52057"><p>OK found an area of my tune that needs work! </p><p></p><p>While cruising on the highway today in 6th gear and give it part throttle (enough to get into low boost) the car drifts lean and starts to shake a bit. Give it a bit more throttle (like half throttle) and it smooths right out and goes to commanded af.</p><p></p><p>Easiest way to recreate it is being in 5th or 6th gear lower rpm's cruising then give it like 1/3 throttle. I wonder if it's getting into boost and still being in closed loop is causing an issue. Or maybe the maf curve needs work.</p><p></p><p>Edit: looking at my logs it seems that I hit a 2.0 load (and boost) at around 200 throttle position. I'm not exactly sure how much boost that is because I don't have boost logged but it's probable a decent amount (10spi?). I have open loop transition set at 300 TP. So I think the issue is that I'm getting into boost while the ecu is still in closed loop trying to maintain 1.0 lambda. </p><p></p><p>I lowered my open loop TP threshold table down to 200 TP counts from 300...so I get into open loop sooner. I would think ideally you want to transition to open loop as boost comes on. I also did a bit of tweaking in my base fuel table so to get more fuel at the lower Throttle position counts. Here is a couple screen shots. I hope this works. </p><p>[ATTACH=full]1652456[/ATTACH][ATTACH=full]1652457[/ATTACH]</p><p></p><p>If I need to get more aggressive with the fuel down low in my table I will... But I think this will improve things.</p></blockquote><p></p>
[QUOTE="03cobra#2, post: 16456998, member: 52057"] OK found an area of my tune that needs work! While cruising on the highway today in 6th gear and give it part throttle (enough to get into low boost) the car drifts lean and starts to shake a bit. Give it a bit more throttle (like half throttle) and it smooths right out and goes to commanded af. Easiest way to recreate it is being in 5th or 6th gear lower rpm's cruising then give it like 1/3 throttle. I wonder if it's getting into boost and still being in closed loop is causing an issue. Or maybe the maf curve needs work. Edit: looking at my logs it seems that I hit a 2.0 load (and boost) at around 200 throttle position. I'm not exactly sure how much boost that is because I don't have boost logged but it's probable a decent amount (10spi?). I have open loop transition set at 300 TP. So I think the issue is that I'm getting into boost while the ecu is still in closed loop trying to maintain 1.0 lambda. I lowered my open loop TP threshold table down to 200 TP counts from 300...so I get into open loop sooner. I would think ideally you want to transition to open loop as boost comes on. I also did a bit of tweaking in my base fuel table so to get more fuel at the lower Throttle position counts. Here is a couple screen shots. I hope this works. [ATTACH=full]1652456[/ATTACH][ATTACH=full]1652457[/ATTACH] If I need to get more aggressive with the fuel down low in my table I will... But I think this will improve things. [/QUOTE]
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