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SVTPerformance's Chain of Restaurants
Tuning À la carte
Is Your Car Tuned Correctly?
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<blockquote data-quote="Don 95Vert" data-source="post: 12518860" data-attributes="member: 15121"><p>FYI - On the example Bobcat gave, 03/04 Cobras have electronic returnless fuel systems. A BAP increases voltage to the fuel pump but Ford's excellent control system still attempts to keep the delta-P at a constant preset level - in the case of an AMZ2 - 39. delta-P will only change (assuming you have properly calibrated the FPVT) if you hack the 'Desired Pressure Drop Across the Injectors' function to get more headroom for inadequate injector size. And this should just be used as a temporary measure until adequate, good injectors can be installed. In other words - if done correctly BAPs do not normally affect delta-P (which is the important part of the puzzle, not fuel pressure), just pump capacity.</p><p></p><p>So if you calibrate it properly and log the right PIDs - you know for sure the delta-P is the same as factory. Yes, flow to the injectors will increase from the pump(s) but delta-p will be maintained. That's why you add a BAP to begin with. It's important not to confuse a BAP with with an FMU used on a return style fuel system which DOES increase fuel pressure directly to the injectors. Completely different animals.</p><p></p><p>In Bobcat's example the only real unknown is the air model.</p><p></p><p>Hope this helps!</p><p></p><p>Don</p></blockquote><p></p>
[QUOTE="Don 95Vert, post: 12518860, member: 15121"] FYI - On the example Bobcat gave, 03/04 Cobras have electronic returnless fuel systems. A BAP increases voltage to the fuel pump but Ford's excellent control system still attempts to keep the delta-P at a constant preset level - in the case of an AMZ2 - 39. delta-P will only change (assuming you have properly calibrated the FPVT) if you hack the 'Desired Pressure Drop Across the Injectors' function to get more headroom for inadequate injector size. And this should just be used as a temporary measure until adequate, good injectors can be installed. In other words - if done correctly BAPs do not normally affect delta-P (which is the important part of the puzzle, not fuel pressure), just pump capacity. So if you calibrate it properly and log the right PIDs - you know for sure the delta-P is the same as factory. Yes, flow to the injectors will increase from the pump(s) but delta-p will be maintained. That's why you add a BAP to begin with. It's important not to confuse a BAP with with an FMU used on a return style fuel system which DOES increase fuel pressure directly to the injectors. Completely different animals. In Bobcat's example the only real unknown is the air model. Hope this helps! Don [/QUOTE]
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Is Your Car Tuned Correctly?
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