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SVTPerformance's Chain of Restaurants
Tuning À la carte
Dies on Return to Idle
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<blockquote data-quote="SecondhandSnake" data-source="post: 15753288" data-attributes="member: 116684"><p>decipha- I've actually been using dashpot values based on your guide for awhile.</p><p></p><p>Finally got a chance to put together a cal and take it for a run to get some data. After looking through the data, it looks like I overshot the adjustment, down to where my IACDC is too low. It did drive remarkably better though. Maybe it's the engineer in me, but I'm just as happy to get bad data, because with interpolation two wrongs can make a right.</p><p></p><p>I've got the data for the base throttle stop position; IACDC, and flow through the TB. I've got the same for my second position. I pick the target of ~45% IACDC, and interpolate between the two points to determine how many turns of the stop I need, as well as how much airflow I should see through the TB. It may not be right on the money due to using linear interpolation, some MAF noise and rounding error, but it ought to be pretty damn close, at least to the point it's easily driveable. I think I'll also dial the dashpot preposition and decay rate to be a little more aggressive now that I don't need a bandaid to keep it from dropping too quick.</p><p></p><p>EDIT:</p><p></p><p>Still pretty garbage at startup. Only likes it with the adjustment screw way out.</p><p></p><p>Any chance I'm running into an issue with "Max Mass Air Allowed At Idle?" Stock setting is 1.3 on it. It seems like it's capping my ISCDC around that airflow.</p><p></p><p>I think it's dialed in when hot. The ISC neutral idle air table is pretty spot on for my tested hot idle values, and matches pretty closely the stock 03 Cobra table. The airflow through the TB should be at least in the ballpark.</p><p></p><p>Now I think I've got another spot to tune; the startup ISC airmass multiplier. I just stumbled across Decipha's cold startup guide. I hadn't even thought of needing to change that table from stock. Needless to say, it's going to want a <em>lot</em> more air on cold start than it currently has.</p><p></p><p>Only drawback is I'm using SCT Advantage so there's a painful amount of trial, error, reflash, and datalogging. No live adjustment for me on cold start. Feels bad, man.</p><p></p><p>DOUBLE EDIT:</p><p>Used the cold start data with the throttle body adjusted way out to calculate the multiplier. After a lot of interpolation and calculations, the cell for startup around 60 deg F ECT should be 3, vs. the default table that starts at 1.6@0s and tapers to 1.15@30s. It was getting half as much as it needed. That would explain things. I'll update the table, as well as stretch out the time running from 30s to 120s on the y axis.</p></blockquote><p></p>
[QUOTE="SecondhandSnake, post: 15753288, member: 116684"] decipha- I've actually been using dashpot values based on your guide for awhile. Finally got a chance to put together a cal and take it for a run to get some data. After looking through the data, it looks like I overshot the adjustment, down to where my IACDC is too low. It did drive remarkably better though. Maybe it's the engineer in me, but I'm just as happy to get bad data, because with interpolation two wrongs can make a right. I've got the data for the base throttle stop position; IACDC, and flow through the TB. I've got the same for my second position. I pick the target of ~45% IACDC, and interpolate between the two points to determine how many turns of the stop I need, as well as how much airflow I should see through the TB. It may not be right on the money due to using linear interpolation, some MAF noise and rounding error, but it ought to be pretty damn close, at least to the point it's easily driveable. I think I'll also dial the dashpot preposition and decay rate to be a little more aggressive now that I don't need a bandaid to keep it from dropping too quick. EDIT: Still pretty garbage at startup. Only likes it with the adjustment screw way out. Any chance I'm running into an issue with "Max Mass Air Allowed At Idle?" Stock setting is 1.3 on it. It seems like it's capping my ISCDC around that airflow. I think it's dialed in when hot. The ISC neutral idle air table is pretty spot on for my tested hot idle values, and matches pretty closely the stock 03 Cobra table. The airflow through the TB should be at least in the ballpark. Now I think I've got another spot to tune; the startup ISC airmass multiplier. I just stumbled across Decipha's cold startup guide. I hadn't even thought of needing to change that table from stock. Needless to say, it's going to want a [I]lot[/I] more air on cold start than it currently has. Only drawback is I'm using SCT Advantage so there's a painful amount of trial, error, reflash, and datalogging. No live adjustment for me on cold start. Feels bad, man. DOUBLE EDIT: Used the cold start data with the throttle body adjusted way out to calculate the multiplier. After a lot of interpolation and calculations, the cell for startup around 60 deg F ECT should be 3, vs. the default table that starts at 1.6@0s and tapers to 1.15@30s. It was getting half as much as it needed. That would explain things. I'll update the table, as well as stretch out the time running from 30s to 120s on the y axis. [/QUOTE]
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Tuning À la carte
Dies on Return to Idle
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