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The Terminator
Engine/Tuning
Looking for advice on larger than ID1000 injectors
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<blockquote data-quote="MalcolmV8" data-source="post: 15327053" data-attributes="member: 8854"><p>39 PSI base pressure. Using dual 465 pumps. AFR was 12.0 but I'd like to drop that to 11.0 once I have more injector. Yes I know I could turn base pressure up to 60 PSI and try and get more out of the ID1000s but with the 4lb lower I'm at 30 PSI of boost (at 5500 RPM and it was climbing) so that would put my fuel pressure up to at least 90 PSI WOT at 5500 rpm, probably more as the RPMs wrap up more. I've heard relief valves on the pumps are around 100 PSI so I'd be approaching that limit.</p><p>Car is on E85.</p><p>Pressure drop across injectors holds the 39 PSI across the sweep so fuel pump does not appear to be running out yet.</p><p></p><p></p><p></p><p>Read comment above why I have concerns about bumping base fuel pressure. Also not sure how much that would help. Going from 39 PSI to 60 PSI is 1.538 square root is 1.2403 so my 1000 CC injectors would essentially become 1240 CC at 60 PSI. I'm not sure if that's going to be enough to hold them at 80% or less duty cycle at the top of 4th at 7k RPM with the 4lb lower on.</p></blockquote><p></p>
[QUOTE="MalcolmV8, post: 15327053, member: 8854"] 39 PSI base pressure. Using dual 465 pumps. AFR was 12.0 but I'd like to drop that to 11.0 once I have more injector. Yes I know I could turn base pressure up to 60 PSI and try and get more out of the ID1000s but with the 4lb lower I'm at 30 PSI of boost (at 5500 RPM and it was climbing) so that would put my fuel pressure up to at least 90 PSI WOT at 5500 rpm, probably more as the RPMs wrap up more. I've heard relief valves on the pumps are around 100 PSI so I'd be approaching that limit. Car is on E85. Pressure drop across injectors holds the 39 PSI across the sweep so fuel pump does not appear to be running out yet. Read comment above why I have concerns about bumping base fuel pressure. Also not sure how much that would help. Going from 39 PSI to 60 PSI is 1.538 square root is 1.2403 so my 1000 CC injectors would essentially become 1240 CC at 60 PSI. I'm not sure if that's going to be enough to hold them at 80% or less duty cycle at the top of 4th at 7k RPM with the 4lb lower on. [/QUOTE]
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Looking for advice on larger than ID1000 injectors
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