mufflerguy

Anyone running this new pump? Should this be enough to support 700 with 96lb injectors on a 5.3?

superdave84

is that liters per hour? Or is that a typo? 255 gallons per hour would be about 1000 LPH

mufflerguy

http://www.fuel-pumps.net/walbro-dcs...fuel-pump.html

gofastwclass

iTrader: (2)

Some of the forced induction guys are running those instead of dual pumps. I believe it draws a lot of current so plan wisely.
Note, there are two versions: one for gasoline and one certified for 100% e-85 use.

audacious nick

You can't be so vague when asking these questions. NA, supercharged FI, turbo FI, and Nitrous all have different fuel requirements.

mufflerguy

It looks like the people above understood where its going. 5.3 w/ 76mm turbo. The package should put 650 to the ground.

static low 92

iTrader: (2)

I actually have same question as mufflerguy, i found this one.

http://www.nolimitmotorsport.com/pro...00267-400-0085

I think its same pump, just E85 version. I'm doing a turbonetics 76 on an L33 and really would like to run 1 intank. I have similar goals as mufflerguy. I have -8AN feed, -6 return and 60lb injectors.

HexenLord

The problem with 60 lb injectors is that you might have to increase the fuel pressure a bit to keep the injector duty cycle down. Increasing the fuel pressure also limits the flow of the fuel pump.

static low 92

iTrader: (2)

I can always do 80s if i have to. But im confident that 60s will do what i want.

Question really is will pumps shown above supply the volume single handedly that a 600-700hp engine will require?

HexenLord

Yes. But at 700whp you'll need a decent amount of fuel pressure on 60 lb injectors.

The walbro will handle 700whp at 60 PSI, it will not at 85 PSI. Upping fuel pressure to increase injector flow ultimately reduced pump flow. You must find a balance to make them both work.

mufflerguy

Hey! Its all about me here!!

If I use the 96's, am I going to give up some driveabilty? This is first and foremost a street car. I'm thinking the 80's may be a better balance, but I'm not very educated on the finer turbo points yet. Is my thinking correct?

HexenLord

Depends on how much power we're talking. I usually recommend 80s because they support ~800whp at reasonable fuel pressures. 60s are usually comfortable below 650whp. You can get more out of them by increasing pressure, but that's when you have to start looking at other options for fuel pumps.

650whp can be made on a large single pump like the Walbro 400 on gasoline. 800whp on E85 is usually pushing the limits of a pair of the smaller Walbro 255s.

In these cases, larger injectors can usually take some of the stress off of the fuel pump(s). 96 lbs can still be ran with decent driveability especially if they are high impedance.

mufflerguy

At 650 to the wheels (700 + ish), is a 3 bar map a requirement, or will a 2 bar work. Again, I am reading about driveability issues when you get into the 3 bar, but I am not knowledgeable enough yet to understand the difference. Thanks for the help.

HexenLord

Which MAP sensor you have is not based on power. A 2 bar MAP is only good up to 15 psi. Any higher and it won't see the additional boost.

Pop N Wood

iTrader: (1)

First and foremost a 700 HP street car.

You run on some mean *** streets!

mufflerguy

Hehe...........honestly, I did not set out to build this much hp! My original plan was a 600hp LSA motor. Then I started reading about issues GM was having with the eaton superchargers and I started looking at other options. I got in touch with Lil John and told him my goals, and he recommended a package for me. Now I'm seeing some of the numbers that this combo makes and I'm like wow! This is a new build, from scratch, so I need to purchase everything. I'm just trying to educate myself so I do things right the first time, and don't need to backtrack and purchase stuff 2 or 3 times. I want to make sure that the pieces I purchase are geared towards good street manners first, and power levels second, because its looking like this combo will build substantially more than my original goals.

mufflerguy

So if I set this turbo set up to make 15lbs and no more, then IYO, would 80's and a 2 bar map get me better driveabilty that 96's and a 3 bar? Or am I better to buy the larger stuff now, and rely on the tuner to get me a good street tune? Thanks for the help guys.

NOS327

iTrader: (30)

Be sure to get the 450lph pump, F90000267. There've been a few threads about durability issues with the 400lph F90000262 pump, presumably either people trying to run e85 through them or possibly the small amount in typical pump gas (10%). Prices are similar, just get the bigger one. I got mine on ebay for $137 shipped. The two are visually distinguishable because the 450's pigtail is hardwired to the pump while the 400 has terminals that you push wires onto.

mufflerguy

Thank ^^^^^^^ you.