Data: Stock Style Fuel System Limitations

Discussion in 'Fox 5.0 Mustang Tech' started by Rick 91GT, Sep 20, 2013.

  1. I see this topic brought up a lot and thought I would share some recent real world data straight off the dyno.

    331, AFR 185, spyder intake, v2sq 2.85" pulley, 6.87" lower.

    Stock fuel lines
    -8 feed from stock hardline to Edelbrock fuel rails
    -6 return to stock hard line
    Gs340 high pressure 255lph with vortech t Rex inline
    60lb inj

    5000rpm car went violently lean...550rwhp

    Replaced trex with gsl392 255lph inline
    6300rpm car goes to 13.5:1 and steadily goes leaner ....604rwhp



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  2. So what is your recomendation for a complete stock fuel set up with a 255lph fuel pump only, .... good to what range of hp???
     
  3. so looks like the gss340 can about handle you til the stock block limits
     
    Rick 91GT likes this.
  4. Na or boosted?

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  5. Both :flag: stock set up 255lph with bigger injectors only.
     
  6. 450-480rwhp

    Around 500rwhp I like to see at least rails which will help keep more volume at the large inj.

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    Grabbin' Asphalt likes this.
  7. At what point would you say it be good to upgrade the lines as well the same time you do the rails??
     
  8. I like to do the pump and lines at once....

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  9. I have to wonder if that T-Rex is slowing fuel volume down a bit.

    Aren't those things designed to help the in-tank pump keep flow up at elevated pressures (say, an FMU)?

    At regular pressures, I have to wonder if the in-line pump might hinder the ability to flow all the volume demanded by that combo and 60 lb injectors.