Quick question, my factory feed line is -6 AN and Id like to use it as a return line for my 1000 WHP turbo build. Is it big enough?

Thanks.

 

bump.

 

Most use a -10 feed and a -8 return on high HP builds.

 

OK, I planned for a -10 feed, I was just hoping the factory -6 could work for the return dammit

 

The -6 return will be fine. Look at it this way, if you put a straight through coupler in place of the regulator and ran the fuel pump(s) with the engine not running you are now at maximum possible recirculation. How much pressure would you see at the rail? Probably close to nothing.

Only time return line size could effect fuel system performance is if it was so small it didn't allow the regulator to control pressure at idle. (Say you were going for 43psi base pressure and no matter how far you turned out the regulator pressure wouldn't drop below 50).

If this doesn't happen (and wouldn't with a 3/8 line) then the regulator is the return restriction and going to a bigger return line would serve no purpose.

You could run a -8 feed as well if you want to save some cash over -10.

 

what's the limit for 8an feed and 6an return on E85?

 

-6 AN is enough of a feed line for 99% of the turbo builds on this forum. It will be more than enough for a return line.

 

I did -10an from pump to rails, split into -8an feeds, then a -8an return with a fuel cooler inline before it went back into the tank. 840rwhp on e85 and 160lb injectors.

 

I agree. You would be amazed how much the line can flow. Way more than most will ever need.

 

Thanks for the input, reading on line there is a lot of conflicting ideas on the subject and Ive been under the impression that at an absolute minimum a -10 feed and -8 return was required. Id really like to be able to use the factory -6 AN feed line as a return and save some dough.

 

-6 FEED has been proven for 1000RWHP plenty of times. Not the safest but it does work. Id say -8 feed is fine with a -6 return.

 

Use it. Any one who really knows will tell you its fine. Look at the A1000 system on this page. For up to 1000hp forced induction is recommends a -6 return and a -10 feed.

http://aeromotiveinc.com/wp-content/...werPlanner.pdf

 

your factory feed line is not equivalent to -6, but it will still be fine

 

Well **** I thought it was equivalent to -6 AN.

 

Its close!

http://mightym0use.wix.com/mm-solutions