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?

 

In for some info as I'm curious myself.

 

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

 

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.

 

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

 

what if u block the return for extra pressure?

 

you are wrong.

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

 

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?

 

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

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

 

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.

 

my pte 1000s made 525 at 95% duty