LightningTeg

Looking to go E85 here soon. Going to be running a Walbro 400, Aeromotive regulator and my PTE 1000's @ 50psi. Looking for 550whp

When does one need to run a larger return line?

DC4KiD

iTrader: (4)

In for some info as I'm curious myself.

sanman000719

i making 757whp on a stock return. i wont tell you its not affecting me, but its doing its job for now

Muckman

iTrader: (2)

When you have 70psi on the rail at idle and you cant turn down your Weldon regulator anymore. Thats when the return is a restriction. Until then dont worry about it.

Oh and 1000cc's will max out around 450 on E85.

LightningTeg

With a Walbro 400? I've heard of that number for 255's but I was reading threads yesterday with people making upper 500s on PTE's

Whiterice-gsr

what if u block the return for extra pressure?

MR.johnson

you are wrong.

and when you cant turn the pressure down at idle its time for a bigger return.

Muckman

iTrader: (2)

Sure the pump is capable but the injectors dont have the volume. You can squeeze another 25hp out of them if you crank the pressure to 100psi. I have two Walbro 255s at 65psi base (80psi) at 100% duty @ 8700rpm 450whp with ID1000s.

Edit: Mr Johnson, whats the correct answer - 120psi rail pressure?

MR.johnson

http://answers.yahoo.com/question/in...4185410AAtzeyg

read that, you would then have a returnless fuel system.

MR.johnson

here you go. these are all cars that have 1000cc and a 255. dyno charts are in the video.

a few of my friends will be chiming in with their cars and dyno graphs as well.

http://youtu.be/OjkhkXs2118

http://youtu.be/JKG1pTWn6D4

here is shawty22's car, single 255 and 1000cc tuned a few weeks ago.

mycarslow

my pte 1000s made 525 at 95% duty