Fuel pump duty cycle for boosted application

[Bill@HPTuners]

What are you guys running for your fuel pump duty cycles? stock for my application was set to 48% and i've bumped it up a couple of % but i'm wondering if there is a safe number you can get away with when you need to make sure your fuel pressure stays rock solid. Apparently I'm out of injector a bit lower that what I should be ie not much boost but out of injector so I'm thinking my fuel pressure probably isn't what it needs to be.

[Jn2]

I've raised it to 60%, haven't tried higher, but most of my customers don't have fuel pressure gauges so I am not sure how much it really helps.

[G-Town-GT]

I also always raise it to 60% in combination with TVS Gen2R's, 56lb Inj. and VMP BAP, @ 13PSI boost and original injector data from FP works best for me in this setup.

[Bill@HPTuners]

I've raised it to 60%, haven't tried higher, but most of my customers don't have fuel pressure gauges so I am not sure how much it really helps.

Yeah on coyote's theres no schrader valve so its a bit different, you need to buy an adapter that goes inline at the connection near the intake in order to add a gauge, bit of a pita.

[Witt]

What are you guys running for your fuel pump duty cycles? stock for my application was set to 48% and i've bumped it up a couple of % but i'm wondering if there is a safe number you can get away with when you need to make sure your fuel pressure stays rock solid. Apparently I'm out of injector a bit lower that what I should be ie not much boost but out of injector so I'm thinking my fuel pressure probably isn't what it needs to be.

I've raised it to 60%, haven't tried higher, but most of my customers don't have fuel pressure gauges so I am not sure how much it really helps.

I also always raise it to 60% in combination with TVS Gen2R's, 56lb Inj. and VMP BAP, @ 13PSI boost and original injector data from FP works best for me in this setup.

Coyotes are 2 speed mechanical returnless. Duty cycle represents a command sent by the PCM to request specific fuel pump operation. Raising the max duty cycle in the tune will not result in increased pump flow. The only way to do that is to increase alternator voltage output.

fpdutycyc.jpg

[Witt]

Bill, try lowering values 24060 and 24061 and increase 44202, all located under System -> General.

[G-Town-GT]

Coyotes are 2 speed mechanical returnless. Duty cycle represents a command sent by the PCM to request specific fuel pump operation. Raising the max duty cycle in the tune will not result in increased pump flow. The only way to do that is to increase alternator voltage output.

fpdutycyc.jpg

given this information and while using a BAP, one could let the MaxDC stock I guess !?

[15PSI]

I leave mine at 48% and max out the alternator values. Car has a Stage 3, TVS Gen II, with ID1000s (and a VMP BAP). Car dynos around 700 RWHP and has plenty of fuel overhead.

[Bill@HPTuners]

Bill, try lowering values 24060 and 24061 and increase 44202, all located under System -> General.

Thanks Witt, I'll try lowering those 60/61 tables. I did increase the 44202 to 14.7 across the board. And as you stated even with the max duty cycle set to 60% it did not go over 50% in the scanner.

I have ID1050x's on the way but I was told by procharger they should be enough injector for 9psi with the stock shift points but at the stock shift points the duty cycle is well over 130% so I've had to temporarily set my shifts to short shift by 6200 which I hit around 6-7psi but I'm already at 100% duty cycle. Optimally checking my fuel pressure would be my best bet unfortunately I do not have a gauge/adapter currently available though it might very well be in my future.

Was really hoping it was something I screwed up in the tune *snap fingers* darn.

[R8Bill]

what should the recommend changes be in a tune be for a return dual pump system for a boosted application?

[Ranger Coyote]

You can look at http://injectordynamics.com/injectors/id1000/ they have a plug n play datasheet for return or returnless. There are only a few fields they modify between the two, maybe comparing would help you, especially if you use any ID10xx

[SultanHassanMasTuning]

your injector data must be wrong, with only 9 psi LU47 will be more than enough let alone ID1050x

Thanks Witt, I'll try lowering those 60/61 tables. I did increase the 44202 to 14.7 across the board. And as you stated even with the max duty cycle set to 60% it did not go over 50% in the scanner.

I have ID1050x's on the way but I was told by procharger they should be enough injector for 9psi with the stock shift points but at the stock shift points the duty cycle is well over 130% so I've had to temporarily set my shifts to short shift by 6200 which I hit around 6-7psi but I'm already at 100% duty cycle. Optimally checking my fuel pressure would be my best bet unfortunately I do not have a gauge/adapter currently available though it might very well be in my future.

Was really hoping it was something I screwed up in the tune *snap fingers* darn.

[G-Town-GT]

your injector data must be wrong, with only 9 psi LU47 will be more than enough let alone ID1050x

I can only underline that, 13 PSI here with 56lb and no Injector or fuel delay issues at all @7200
Must be something wrong in Inj-data.

[Bill@HPTuners]

your injector data must be wrong, with only 9 psi LU47 will be more than enough let alone ID1050x

Unfortunately it isn't unless fords data is wrong lol. I've attached a recent iteration you can view. They are actually the G302 injectors, not LU47 but still 47lb [email protected] https://performanceparts.ford.com/pa...-9593-g302.pdf

Trust me I wish there was a simple answer here like opps I screwed up the injector data but it doesn't appear so to me at least.

[Bill@HPTuners]

your injector data must be wrong, with only 9 psi LU47 will be more than enough let alone ID1050x

I can only underline that, 13 PSI here with 56lb and no Injector or fuel delay issues at all @7200
Must be something wrong in Inj-data.

I notice both of you are overseas, do you have any ethanol content in your gas where you are? This can also make a pretty big difference in the fuel necessary at a given lambda

[SultanHassanMasTuning]

zero Ethanol

[G-Town-GT]

same here, we have 102 (ROZ) octane pump gas here with zero Alc.
Yes Bill, did not think about that, this indeed can make some major difference.

[Bossy70]

I leave mine at 48% and max out the alternator values. Car has a Stage 3, TVS Gen II, with ID1000s (and a VMP BAP). Car dynos around 700 RWHP and has plenty of fuel overhead.

"max out" the high fuel alternator tables? if so what voltage and fuel cutoff do you use?