Sufficient fuel system for 500rwhp?

[Sabre002]

I like the summit fittings better then Earls any day.  The mandrel is longer and not such a pain to make seal.  As for the lines the factory pressure hard line is supporting 500+ HP in romans car all day.  There was a thread about this back in the day when everyone was just yanking the hard lines out of FD.  Turns out the ID of the factory hard line is the same as a -6.

[mattster03]

if i would be starting from scratch I'm sure there would be a lot more in fittings and lines... i believe I all ready have a good portion of what i would need however.  josh do you still have pictures of your mounting and the fittings you used for your 044?

[Sabre002]

Yes I got it all I can post the full parts list and pics tonight from home if you would like.

[mattster03]

That would be awesome. I vaugely remember your post on the old forum regarding your setup... didnt' mean much to me then, but I I would really find it useful haha

[Cryptic]

I went with 65lb injectors and a Bosch 044. I think I calculated good for 600HP and another 20%. Don't forget about upgrading your fuel lines 

[theantirotor]

I too like the Summit brand fittings.  I am a machinist and I deal with AN stuff quite a bit.  All of the Summit AN parts I have gotten have been nice quality.

[digitalsolo]

FWIW, I've used some "fragola" fittings from Summit also, they seem to be nice quality.

[383mazda]

So stock fuel lines (which are right at the -6 size) can barely handel 500hp - stepping up to -8 how much are they good for?

[MPbdy]

If the stock hard lines are really equivalent to -6 then they can support a lot of horsepower.  These high pressure fuel systems are our friend.  They should support at least 700 at the crank, so around 600 at the tires.

A single -6 would flow close to 400 lb/hr when pumping the fuel system dry on my dad's engine dyno at Flowmaster.

700 (flywheel) * .5 BSFC = 350 lb/hr.  You are close to maxing the line sure...but there is no harm in that.

[Pez]

If the stock hard lines are really equivalent to -6

I just went outside and put a stock FD fuel line inside a -6 hose.  According to summit, the -6 hose is .3438 ID and according to my calipers, the stock FD line is .3151 OD and .2641 ID, which leaves a difference of .0797 ID.  In my book, when taking about diameter of a cylinder in fractions of an inch, that's pretty big.  Calculate the area of the cross section of the fuel line's ID, you're looking at almost a 60% difference in area.

Not saying stock lines can't make power... never tried it.... because I don't have the balls to gamble a big power engine on 1/4" ID lines.  Jus sayin.

[MPbdy]

Well there we go.  I didn't think it sounded right either.

The stock lines are almost 25% smaller than -6.  I doubt the flow is linear, but assuming it is the stock lines would max out around 300 lb/hr...putting 500 rwhp right on the edge.

[Sabre002]

well damn I'm wrong again lol.  Well I know we made 485RWHP on stock fuel lines in romans car.  THe fuel pressure does not move its rock steady at 4 bar. 

[Gearhead]

remember the ford injectors are rated at 40psi. and you need to rescale them for 60psi which you should be running. go with the 60lb fords. i can get you a set for 350 plus the shipping

and the bocsh 044 pump is the shit. i have seen those support 700 wheel in supras. and for sure run -6 line.

[sinful7]

im running dual walbro 255's 8 line to the regulator then 6 out the fpr to the rails then 60 pound injectors with a 60 pound fuel pressure.

[383mazda]

How about a fuel rail question - Professional products fuel rails are like $50, and FAST fuel rails are $200.  How much of a difference is there between them?