Data: Stock Style Fuel System Limitations

[Rick 91GT]

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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[Grabbin' Asphalt]

So what is your recomendation for a complete stock fuel set up with a 255lph fuel pump only, .... good to what range of hp???

 

[madspeed]

so looks like the gss340 can about handle you til the stock block limits

 

[Rick 91GT]

Na or boosted?

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[Grabbin' Asphalt]

Na or boosted

Both stock set up 255lph with bigger injectors only.

 

[Rick 91GT]

Both stock set up 255lph with bigger injectors only.

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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[MikeH686]

At what point would you say it be good to upgrade the lines as well the same time you do the rails??

 

[Rick 91GT]

I like to do the pump and lines at once....

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[Noobz347]

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.