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2011-2014 Mustangs
Power-Adders
Cobra Jet Manifold: Nitrous Install **Pic Heavy**
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<blockquote data-quote="jn2" data-source="post: 15412642" data-attributes="member: 178010"><p>The nitrous and fuel is equally distributed between both banks. If you notice the last row is logging bank 1 and 2 lambda vs commanded. There is an initial lean spike(also equally distributed) when the nitrous first hits, this spike looks long in the log bc i zoomed in a lot, but it only lasts .5-.6 seconds. Once the fuel catches up and starts to spray you will notice actual lambda for both banks vs commanded is within +/- .1λ</p><p></p><p>The lean spike is due to the nitrous beating the fuel to the plate, since its coming out at 900+psi and the fuel is only coming out at 55psi, it makes it there faster. The fix to this is to run a shorter fuel line. The lean spike is also why you see the fuel trims jump up to +5%, the ECM is using STFT to compensate for the nitrous, once the fuel makes it to the plate the fuel trims only need to compensate within +1/2%(due to varying ethanol percentage in the fuel).</p><p></p><p>[ATTACH]73616[/ATTACH]</p><p></p><p>I was just at Nitrous Outlet's HQ this morning and picked up a shorter fuel feed line for this purpose. Right now both the nitrous and fuel lines are 24" from the solenoid to the plate. The new set up will be a 24" nitrous line and a 12" fuel line, this should lead to both reaching the plate at the same time and eliminating the lean spike seen in the graph. </p><p></p><p>[ATTACH]73615[/ATTACH]</p></blockquote><p></p>
[QUOTE="jn2, post: 15412642, member: 178010"] The nitrous and fuel is equally distributed between both banks. If you notice the last row is logging bank 1 and 2 lambda vs commanded. There is an initial lean spike(also equally distributed) when the nitrous first hits, this spike looks long in the log bc i zoomed in a lot, but it only lasts .5-.6 seconds. Once the fuel catches up and starts to spray you will notice actual lambda for both banks vs commanded is within +/- .1λ The lean spike is due to the nitrous beating the fuel to the plate, since its coming out at 900+psi and the fuel is only coming out at 55psi, it makes it there faster. The fix to this is to run a shorter fuel line. The lean spike is also why you see the fuel trims jump up to +5%, the ECM is using STFT to compensate for the nitrous, once the fuel makes it to the plate the fuel trims only need to compensate within +1/2%(due to varying ethanol percentage in the fuel). [ATTACH]73616.vB[/ATTACH] I was just at Nitrous Outlet's HQ this morning and picked up a shorter fuel feed line for this purpose. Right now both the nitrous and fuel lines are 24" from the solenoid to the plate. The new set up will be a 24" nitrous line and a 12" fuel line, this should lead to both reaching the plate at the same time and eliminating the lean spike seen in the graph. [ATTACH]73615.vB[/ATTACH] [/QUOTE]
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Power-Adders
Cobra Jet Manifold: Nitrous Install **Pic Heavy**
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