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2011-2014 Mustangs
Engine/Tuning
Injectors
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<blockquote data-quote="ajpturbo" data-source="post: 13875067" data-attributes="member: 159334"><p>It's actually a combination of both. It's not one or the other. First off, there is a big difference between the 47's and 1000's</p><p> </p><p> If you get the 1000's it will help offset that fact that your fuel pressure is dropping and might help you get away with not having a bap.</p><p> </p><p> A larger injector will deliver more fuel than a smaller injector at the same pressure at a given pulsewidth.(obviously).</p><p> </p><p> Buy the ID's, your tuner will thank you for it and it will cause you less grief possibly. I've spent a lot of time and money retuning and buying new injectors because I had shitty FRPP 80's that idled like shit. And you would never know it unless you looked at datalogs. And it wasn't for a lack of tuning or the know how but because of poor low pulsewidth stability that can't be tuned out. SOme understand this and some don't and think anything can be tuned. They think because their large injectors idle ok they think they are good but the logs would show otherwise.</p><p> </p><p> I put an electric fuel pressure gauge and ran the signal wire into live link and set up the equation, it's a .5v-4.5 v sensor. </p><p> </p><p> The car has a 55psi in tank pressure regulator. I have my Bap set at 70. At 8 psi the fuel pressure starts to fall at about 5000 rpm and by 7000rpm my pressure is about 46 psi. There are tables in the tune to compensate for fuel pressure drop across the injector but most don't know what it is because the new mustangs don't have a fuel rail pressure sensor like the old stangs did.</p><p> </p><p> So you kinda need both...Consistent and better fuel pressure will come from the BAP and adequate fuel volume without having to high of an injector duty cycle will come from larger injectors...In theory I guess you could have 100psi fuel pressure and a small injector because it wouldn't need a high duty cycle because the pressure is there.</p><p> </p><p> But even with large injectos you still need good pressure...I don't think tuners are comfortable with fuel pressure at 18psi when running boost, it becomes unreliable for fuel delivery.</p><p> </p><p> I'm not a tuner.....Maybe the tuners can tell me how I did.</p></blockquote><p></p>
[QUOTE="ajpturbo, post: 13875067, member: 159334"] It's actually a combination of both. It's not one or the other. First off, there is a big difference between the 47's and 1000's If you get the 1000's it will help offset that fact that your fuel pressure is dropping and might help you get away with not having a bap. A larger injector will deliver more fuel than a smaller injector at the same pressure at a given pulsewidth.(obviously). Buy the ID's, your tuner will thank you for it and it will cause you less grief possibly. I've spent a lot of time and money retuning and buying new injectors because I had shitty FRPP 80's that idled like shit. And you would never know it unless you looked at datalogs. And it wasn't for a lack of tuning or the know how but because of poor low pulsewidth stability that can't be tuned out. SOme understand this and some don't and think anything can be tuned. They think because their large injectors idle ok they think they are good but the logs would show otherwise. I put an electric fuel pressure gauge and ran the signal wire into live link and set up the equation, it's a .5v-4.5 v sensor. The car has a 55psi in tank pressure regulator. I have my Bap set at 70. At 8 psi the fuel pressure starts to fall at about 5000 rpm and by 7000rpm my pressure is about 46 psi. There are tables in the tune to compensate for fuel pressure drop across the injector but most don't know what it is because the new mustangs don't have a fuel rail pressure sensor like the old stangs did. So you kinda need both...Consistent and better fuel pressure will come from the BAP and adequate fuel volume without having to high of an injector duty cycle will come from larger injectors...In theory I guess you could have 100psi fuel pressure and a small injector because it wouldn't need a high duty cycle because the pressure is there. But even with large injectos you still need good pressure...I don't think tuners are comfortable with fuel pressure at 18psi when running boost, it becomes unreliable for fuel delivery. I'm not a tuner.....Maybe the tuners can tell me how I did. [/QUOTE]
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