Puffwagon Trust me bro...tbh ;) 8===} Gold Donating Members 16,083 Member For: 10y 1d Gender: Male Location: South Australia Posted 25/04/16 05:39 AM Share Posted 25/04/16 05:39 AM Another easy way to think about it is this; We expect our injectors to flow consistent amounts of fuel for the duty cycle they are operating at. For example; x fuel at 10%dc and 2x at 20%dc regardless of boost level. We also expect that there will be a enough flow available to maintain the spray pattern and consistent pressure to ensure the injector is operating within it's intended parameters. Let's also say for ease of understanding that our rail pressure is 60 psi. When we add 30 psi of boost for hectic skids we lose half of our flow because there is 30 psi pushing against the injectors. This will affect the amount of fuel available for the commanded duty cycle as well as potentially affect the spray pattern and other injector variables. We can also end up with fluctuating pressure in the fuel rail as the injectors open and close if the return flow is not sufficient. When we go nuts and turn it up to 60 psi for 200kph power skids we find that no fuel will flow at all. 60 psi of fuel pressure plus 60 psi of boost means no fuel pressure. Hence we have a fuel reg that provides our set fuel pressure plus boost pressure. Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 19y 4m 7d Gender: Male Location: Perth Posted 25/04/16 05:53 AM Share Posted 25/04/16 05:53 AM Maintains manifold delta Yeah? 1 Link to comment Share on other sites More sharing options...
Puffwagon Trust me bro...tbh ;) 8===} Gold Donating Members 16,083 Member For: 10y 1d Gender: Male Location: South Australia Posted 25/04/16 06:09 AM Share Posted 25/04/16 06:09 AM It appears so. Link to comment Share on other sites More sharing options...
Puffwagon Trust me bro...tbh ;) 8===} Gold Donating Members 16,083 Member For: 10y 1d Gender: Male Location: South Australia Posted 25/04/16 06:11 AM Share Posted 25/04/16 06:11 AM But why or how Ralph? Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 19y 4m 7d Gender: Male Location: Perth Posted 25/04/16 06:17 AM Share Posted 25/04/16 06:17 AM Why? To maintain the pressures differential between fuel pressure and manifold pressure How? Boost pressure is applied to the diaphragm in the fuel regulator,which increases effective spring rate. Link to comment Share on other sites More sharing options...
Puffwagon Trust me bro...tbh ;) 8===} Gold Donating Members 16,083 Member For: 10y 1d Gender: Male Location: South Australia Posted 25/04/16 06:21 AM Share Posted 25/04/16 06:21 AM Spot on. I was elaborating on this so people that are unaware of the how and why have some understanding of the process. What I wrote plus your last comment should leave no one confused. Link to comment Share on other sites More sharing options...
JETURBO ...JD TUNING ADELAIDE... Gold Donating Members 23,708 Member For: 16y 7m 30d Gender: Male Location: Adelaide Posted 25/04/16 07:27 AM Share Posted 25/04/16 07:27 AM I'm confused 1 Link to comment Share on other sites More sharing options...
Ralph Wiggum Moar Powar Babeh Lifetime Members 19,323 Member For: 19y 4m 7d Gender: Male Location: Perth Posted 25/04/16 08:04 AM Share Posted 25/04/16 08:04 AM Bass fuel pressure + boost pressure = hard starting on e85 Link to comment Share on other sites More sharing options...
k31th less WHY; more WOT Site Developer 29,181 Member For: 16y 9m 20d Gender: Male Location: Melbourne Posted 01/05/16 05:12 AM Share Posted 01/05/16 05:12 AM Sick subwoofer on the fuel pressure? Sick mate Link to comment Share on other sites More sharing options...
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