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SVTPerformance's Chain of Restaurants
Tuning À la carte
03 Cobra Tuning - Turbo vs PD Supercharger
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<blockquote data-quote="decipha" data-source="post: 15898373" data-attributes="member: 74327"><p>few tips about boosted 4v in general</p><p></p><p>first off they do not like compression, so if its a high compression boosted 4v then you need to yank the timing way down at peak tq or it will detonate. I have yet to ever tune a 4v that wanted more than 8 deg of timing at peak torque when boosted (w/ up to 12lbs of boost at peak tq)</p><p></p><p>I've never tuned a boosted 4v that's ever wanted more than 20 deg of timing up top including bone stocker's</p><p></p><p>the older b heads typically like a couples degrees more than the c heads, for reference n/a on b heads i usually shoot for 27 degrees, n/a on c heads (low compression) i shoot for no more than 23 degrees. C heads with high compression they never want any more than 16 deg at peak tq naturally aspirated (think marauder and mach 1). The b heads for some reason seem to be less temperamental to higher compression than the c heads for some odd reason.</p><p></p><p>the cobra 4v's want a lot of dashpot for best driveability, i recommend setting the min dashpot and min idle correction MPH scalars to 25 for both - as is stock on the cobras.</p><p></p><p>the 03 cobra has the fastest of the eec-v processor speeds. As such, the highest injector slope value the code can calculate is 0.0167 although you can stuff a higher value than that in the software the ecu code will clip it to no higher than that value. So be sure you scale your tune back far enough that its below that.</p><p></p><p>regardless of n/a turbo or blower you should always scale your table's load axis accordingly to give yourself the most resolution. At 0 vac / 0 boost be sure you don't exceed MBT. Then linearly reduce it from there. If done correctly you'll see that it doesn't matter if its a turbo or a blower, a turbo can't reach those higher load values at a lower rpm so it will have more timing than a blower that makes more boost down low.</p><p></p><p>remember, the ecu "see's" boost as load. So know where your 0 vac / 0 boost load value is throughout the rpm range.</p><p></p><p>I know this goes without saying but don't forget to let the turbo cool down after making a pull. Don't just make a hard pull and shut the engine off. Let it run for a bit to cool the turbo down before shutting her off.</p><p></p><p>btw, sct is pretty outdated when it comes to the EECs. Its much easier and faster to do realtime tuning using a moates quarterhorse. It saves a bunch of timing being able to write tune changes while the engine is running rather than that archaic method of flashing with the handheld. Not to mention the custom tuning software for the 03-04 cobras is free for the QH.</p></blockquote><p></p>
[QUOTE="decipha, post: 15898373, member: 74327"] few tips about boosted 4v in general first off they do not like compression, so if its a high compression boosted 4v then you need to yank the timing way down at peak tq or it will detonate. I have yet to ever tune a 4v that wanted more than 8 deg of timing at peak torque when boosted (w/ up to 12lbs of boost at peak tq) I've never tuned a boosted 4v that's ever wanted more than 20 deg of timing up top including bone stocker's the older b heads typically like a couples degrees more than the c heads, for reference n/a on b heads i usually shoot for 27 degrees, n/a on c heads (low compression) i shoot for no more than 23 degrees. C heads with high compression they never want any more than 16 deg at peak tq naturally aspirated (think marauder and mach 1). The b heads for some reason seem to be less temperamental to higher compression than the c heads for some odd reason. the cobra 4v's want a lot of dashpot for best driveability, i recommend setting the min dashpot and min idle correction MPH scalars to 25 for both - as is stock on the cobras. the 03 cobra has the fastest of the eec-v processor speeds. As such, the highest injector slope value the code can calculate is 0.0167 although you can stuff a higher value than that in the software the ecu code will clip it to no higher than that value. So be sure you scale your tune back far enough that its below that. regardless of n/a turbo or blower you should always scale your table's load axis accordingly to give yourself the most resolution. At 0 vac / 0 boost be sure you don't exceed MBT. Then linearly reduce it from there. If done correctly you'll see that it doesn't matter if its a turbo or a blower, a turbo can't reach those higher load values at a lower rpm so it will have more timing than a blower that makes more boost down low. remember, the ecu "see's" boost as load. So know where your 0 vac / 0 boost load value is throughout the rpm range. I know this goes without saying but don't forget to let the turbo cool down after making a pull. Don't just make a hard pull and shut the engine off. Let it run for a bit to cool the turbo down before shutting her off. btw, sct is pretty outdated when it comes to the EECs. Its much easier and faster to do realtime tuning using a moates quarterhorse. It saves a bunch of timing being able to write tune changes while the engine is running rather than that archaic method of flashing with the handheld. Not to mention the custom tuning software for the 03-04 cobras is free for the QH. [/QUOTE]
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Tuning À la carte
03 Cobra Tuning - Turbo vs PD Supercharger
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