overZealous1

iTrader: (27)

was curious on your twin pump set up. are you running 2 feed lines with it? i talked with carlos and he is anxious to get this piece from ya.

XBS

iTrader: (29)

OK this the best way to do this is to feed both rails with a Y, then on the other end they come out into another Y which is the return which goes to the FPR then return back to the tank?

XBS

iTrader: (29)

I drew a picture ( MS Paint gotta love it ) to explain what i am thinking, tell me if this looks right, thanks again everyone!

-George

overZealous1

iTrader: (27)

no need to Y again before the fpr. just get one with dual inlets, single outlet. feed from the rear as that gives you the least amount of bends for flow. bends in the returns are not as important. in the pic of the rails on the motor i was short one fitting so just imagine it hooked up, lol. those are the only pieces i used (minus the lines) to make the return. i used an inline walbro though in stead of intank. still have the stock pump w/ no mods to the stock fpr or anything. using the stock pump to feed the walbro. will find out how much flow this is good for to please everyone very soon. the stock pump should freeflow enough fuel to keep the walbro satisfied making the pressure and theoretically, the stock fpr should never close. on the down side, the walbro inline is noisy. i can live with it though. just need to insulate better. there is a perfect spot for it under the car under one of the covers by the trans.

phunk

iTrader: (21)

that is using all factory feed lines. the car running a walbro to 675ish rwhp has all upgraded undercar lines and output fitting to help

XBS

iTrader: (29)

for my goal of a safe/reliable 520whp car will stock lines be ok or should i upgrade them to aluminum and 3/8" size?

XBS

iTrader: (29)

What Size lines should I run, and what output fitting? where can i get one?

Thanks Charles!

-George

phunk

iTrader: (21)

PM Sent

MardiGrasMax

iTrader: (8)

255 "High Pressure"?

And at what fuel pressure for the 550whp limit?

phunk

iTrader: (21)

you will want the Walbro part number GSS342. This is the best fit 255 high pressure pump for your car.

The required fuel pressure for 550whp will depend heavily on your injector sizing and design of your fuel system. You should really have 650cc or larger injectors for this goal. Perhaps start with a base pressure of around 50psi, and adjust it as needed.

Zilvia

iTrader: (1)

anyone know a good fuel return set up for the PETT

XBS

iTrader: (29)

cj-motorsports.com has a great fuel return kit Zilvia, check it out

Zilvia

iTrader: (1)

i will.......

XBS

iTrader: (29)

Has anyone every thought of running 2 intank stock fuel pumps, basically buy another fuel assembly and place it in the driver side tank, keep the stock FPR then run one fuel pump for each rail, without a return, just one pump on each rail, both stock, what do you guys think?

Zilvia

iTrader: (1)

phunk is developing a Twin pump sytem but not sure if he is using stockers.............go check his thread

XBS

iTrader: (29)

Yea i know, i beleive his uses aftermarket pumps for very high power levels

phunk

iTrader: (21)

No good... one pump will run dry before the other and fry out... and most likely in the first one or two times you drive the car. this would only work if you constantly kept the tank filled nearly all the way to to top.

The gas tank is divided by the driveshaft, which is why you cannot do this.

To twin pump this car is much more complex then you would imagine at first, which is why its been taking a while for professionals such as my company and AAM to come out with a solid enough solution to sell to others.

XBS

iTrader: (29)

so this would not work when u get to a 1/4 tank just wondering me and my budy were thinking about it the other day

MardiGrasMax

iTrader: (8)

Bingo on the HP.

Why wouldnt you guys drop down to 43PSI base? (you would need to check the FP PSI your injectors flow rates are based off of). This way the GSS342 has more volume left in it. Put a Kenne Bell Boost-A-Pump on it and at 17v you should be good for a good bit more volume over the 13.5v flow ratings on the GSS342. Perhaps 850bhp? or if you keep the 50PSI base perhaps 800bhp.

http://www.kennebell.net/accessories...boostapump.htm

phunk

iTrader: (21)

i run 1000cc injectors so i have no problems with my base pressure at 43psi.

personally, i would never run that boost a pump. i would rather have twin pumps, obviously