you said the fuel pressure stayed at 40 psi? shouldnt it be 14 psi higher to counteract the boost pressure.

 

In that case your in need of an injector change. Your 42# injectors are flowed @ 43.5psi I believe so @ 39psi obviously the HP rating would be lower. If you have 42# green top's or similar you should be running 43.5 static fuel pressure, not 39psi (if thats where your at?) also a newer EV6 39# injector @ 43.5psi will flow identical to an EV1 green top injector flowed at the same pressure because all newer style EV6 injectors are flowed @ 39psi. 410hp is very conservative. I'd be worried when Im @ 500hp but all set-up's are different.

 

Fuel pressure should be rising with boost pressure! Please list the rest of the fuel system from pump to rails.



If it was running out of fuel on the dynoed the tuner could have bumped the base pressure up....

 

Do exactly what PrecisionTurboMustang said. Bumping the base FP to say 45psi? might "bandaid" the situation but your means of running out of fuel may be causing the problems elsewhere. Give a list of your entire fuel system front to back and mabey someone can give there 2 cents on the topic. I'm instrested as well so hopefully this tread will keep going till the problem is corrected. Just tryin to help you out bud!

 

the car has a 255lph in tank fuel pump, stock lines and fuel rails, 42# injectors. You know, being a newbie and buying someone else stuff... And know the rest of the story....the rest of the set up...stock std. bore 302 block, stock GT40 heads, f303 cam 70mm turbo, 14 psi boost, no o2 being use in ECU,

So...the plan is, 60# ford racing injectors, walbro 400lph intank pump, 10AN fuel feed line and use the stock feed line as the return, some higher flow (billet?) fuel rails, bigger (meaning high flow) fuel filter, and a fuel regulator that adjusts with boost? Is this plan OK? need feedback!!!! This is a back burner project at this point in time...got two others that are taking higher proirity for the next 6 weeks, but I need to get my parts selected and procured.

Now...I do need some help here on selecting the parts. I did look into the Areomotive complete fuel systems, but not in my budget.

My goal is a 500 rwhp street car (maybe driven 500-1000 miles per year) the will go to the drag strip and run 1/4 mile in the mid 10's 8 times a year for some buddy grudge racing.

Again, guys thanks for the feedback! new to all this turbo stuff on v8's and EFI tuning.

Last item...will keep this thrd going till #1 achieve the 500hp goal , #2 it blows up , #3 run out of money #4 I sell it!

 

I made over 507rwhp at 11psi with stock fuel lines, stock fuel rails and a Walbro 255 intank.
42lbs ford racing injectors and 43psi base fuel pressure.

Here is the data log.. 82.1% dutycycle

#ad

 

like everyone state's, do not skimp on the fuel system, but i would think a 255 intank,with stock lines/rails,a good adj fuel pressure reg,and those 42's should support 500.

maybe add an inline booster pump,like a t rex or something for extra insurance, are you running some type of boost retard? or is that burned into the chip?

 

boostedpony made 523 on the dyno, stock lines, rails, 42's, and 255 in tank.. not sure if he has an in line pump too, 11.5 afr @ wot, shifting at 6300ish.. he went 11.3 first track outing on 17" street tires and the car is lowered 2.5". i think he said the duty cycle was over 90%. street tuned with the pms it gets over 24mpg highway too!

 

As was said before in this you should have base+boost pressure as your FP. If you read 40 congrats you're low. If it stayed at 40 the whole time was the regulator referenced to the intake? Just wondering if it was or if it was disconnected. Besides that if it did it could be a restriction issue somewhere in the lines or a flow issue with the pump.

Otherwise did you measure converter slip? Short of the caveats above if you ran those #s with those injectors there is likely something going on if you're using gasoline.

 

I've got a gauge on the fuel rail....it stayed at 40'ish from an idle through the complete dyno pull. did not measure converter slip, I don't know how to do this? engine rpms vs drive shaft rpms?

running 93 octane pump gas.

 

With a base fuel line pressure of 40psi and 14psi of boost observed rail pressure should be around 53psi. Your FPR may not be working properly.

 

fuel pressure needs to go up with boost pressure...hummm so does this mean the FPR requires feedback or input from the boost pressure to increase the fuel pressure?

 

With a vacuum line hooked to the FPR, line pressure increases when the boost from the manifold increases. The boost pressure pushes down on the fpr diaphragm to increase rail pressure.

 

As the boost psi rises it pushes against the fuel coming out of the injector. Fuel pressure has to rise to compensate. If your tuner didn't notice this you need to find a different one.

 

newbee's need to research, read, then research and read more.

good read from ford racing about fuel injectors and fuel requirements. http://www.fordracingparts.com/download/charts/Fuel_Injectors_and_Adaptors.pdf

 

this

 

A little up date on what I found on my 5.0 fox set-up.
#1. waste gate has an yellow spring which = around 10 psi boost per Tial web site and supporting vendor VSracing! way was it boosting to 16 psi...the issue I found was the diaphragm was pinched with the cover, so I don't think it could open.
#2. BOV had a major vacuum leak to atmosphere. also...a very long and small diameter line connecting it to engine vacuum.
#3. fuel pressure regulator...it's line as well was tied into the BOV line, not sure if its seeing any boost because of leakage, or it just is not working. So...more work to check if this FPR is working.
the more I look/check, the more hacked up/butchered this car is I find it totally amazing what people think they have VS what they actually have...like, are you using wide band O2 sensors? reply was stock O2, but the car doesn't even have O2 sensors in the system...lol Buyer be ware! and...your ears hear someone else is truth, your eyes see your truth!
status: cars up on jack stand getting new poly/delrin bushings and battle box re-enforcements on the rear suspension and vacation to FLA, it will be a couple of weeks before testing of the repairs/improvements...
Thanks to all that have replied...