ABeasst

iTrader: (5)

I put this in here because most of the people running this setup are in here. Also FI causes a lot more heat and I need to know if people are having them overheat in stop and go traffic.

I have an A1000 right now and I dont like that it will overheat in stop and go traffic on a hot day as well as its loud.

Anyone have experience with this setup.

onfire

iTrader: (17)

Twin 420's for 2 years. One runs all the time. One runs off a hobbs switch to keep the fuel cool. No problems on the street at all. 9.2 at 146mph with plenty of fuel to spare. Big single pumps can be great. Only problem is recycling a big volume of fuel at 58psi will heat the fuel....doesn't matter what name is on the pump....it's physics...and the less gasoline in the tank...the hotter the fuel will get...causes cavitation, and some pumps will shut down due to that heat if it is run on the street for extended periods....some single pumps will tolerate the heat and keep pumping.....and the fuel gets hotter and hotter....

ABeasst

iTrader: (5)

do you run a one way valve before the y to keep the fuel from coming back when the 2nd pump is off. Any pics?

2000 Tran Zam

iTrader: (2)

Ya my eliminator pump had some cavitation issues with FP fluctuating during the summer time. Its a real pain in the ***...

427

iTrader: (3)

I run the twin Bosch pumps in the Nova. They have been trouble free for two years now. I also run one pump constant with the BS3 turning on the second when needed. When we wired the car we made the connectors the same and I flip them sometimes to keep changing my "primary" pump. The pumps come with a check valve built in so they won't back flow.

Kurt

ABeasst

iTrader: (5)

alright thanks. Did you also run a filter before each pump using 8AN line?

427

iTrader: (3)

Yes. Two filters with two -8 lines.

Kurt

stevieturbo

Ive been running a pair of 044's now for almost 2 years. I run them both all the time, and have never had any issues.

Longest drive almost non stop would be about 7 hours ( maybe 30 mins stop time during that )

No idea how much they flow....Bosch themselves claim about 200lph. Not sure why they end up at 420lph in the US, although Bosch's figures are probably conservative.

MIGHTYMOUSE

iTrader: (59)

the 044's or the '420's whatever you call it flow 340 lph at 4 bar

I have one on deck, though i am really proud of my two 255 walbros to pull my sled over 150 in the quarter

stevieturbo

Did you bench test that ? Most info Ive found, the Aussies advertise them as 330lph.

Alhtough here in the UK it varys between 180-200lph, which are Bosch's own figures at 3 bar. It baffles me....never actually tested them myself.

Although I might just do that very soon. I would be in a position to test mine at the minute.

MIGHTYMOUSE

iTrader: (59)

bosh has other pumps like the one ending in 040 that are lower flow than the one ending in -044

stevieturbo

040 is the internal tank version of the 044, with it having an open end/gauze, as opposed to a threaded fitting.
It is rated slightly lower. Although both can be used in-tank.

The 044 is the "big" pump worldwide. The only better version, is their 10 bar motorsport 044 ( different part number though ). It maintains its flow rating up to 10 bar, as opposed to 7.5-8 bar with the 044.

theblur98ss

iTrader: (71)

Is everyone running both pumps into an -8an Y to a single -8an feed to the rails?

ABeasst

iTrader: (5)

I was going to run 8an to the y then 10an single line to the rails where it splits to the rails.

stevieturbo

I run -8 from each pump, into a tee ( one pump straight thru, other tee'd ) feeding into a 1/2" hardline to the front of the car.
From there I use an Aeromotive fuel dist block, and a pair of -6, one to each rail.

Y's are nice...but I just didnt really have the room.

onfire

iTrader: (17)

The 10 bar motorsport 044 is the exact same pump as the "regular" 044, except it has been bench tested to insure it will flow the number at the higher pressure.

My 044 bench test from Kinsler:

psi lb/hr L/hr

0 490 303

20 445 275

50 420 260

70 390 241

100 350 216

I think the "420L" designation is confusion of the 420lb/hr at 50psi flow that was later taken as Liter per hour. On the Kinsler bench, this pump kills the Walbro at +70psi. Under 70psi the Walbro is a very nice pump.

stevieturbo

For the money, the little Walbros are hard to beat !!!! Ive done the mod, but havent tested flow ability afterwards. But AFAIK there is a pressure relief valve on the Walbros, that dumps pressure at the top end, which is perhaps why flow suffers.
There is what looks like a small relieve spring at the top of the pump. Ive epoxied this up before, but never actually tested afterwards.

I'll definately be testing my setup this weekend to see what it flows.

stevieturbo

Quick test.

Fuel tank has 5/8 outlet, into Aero fuel filter, tee'd pair of -10 into a pair of 044's

Exit 044's in -8, teeing into 1/2" OD Alu hardline to Aero dist block. For purposes of test, only using 1 -6 hose from the dist block to regulator.
Then exit regulator, -6 fitting, into fuel jug.

Batt voltage was 12.2v, dropped to 11.85v during test. Regulator normally sits at 4.5bar, 66psi, although I didnt verify it during the test. See no reason why it wouldnt be as normal ( isnt easy to check this on my own as well as doing the test )

Running pumps for 20 seconds, filled the fuel jug with 2.4 litres of fuel.

This would be 432lph at 66psi, for a pair of 044's

This would just about be enough to maintain supply to 8 x 900cc injectors at 100% duty running at 12 volts, 66psi.

Im sure this will increase when Batt voltage is at its typical 13.5-14.0 volts though. I might try some jump leads on my battery from another vehicle to get it up to full power and see how it performs tomorrow..

No idea if a single -6 line would be creating any restriction for this test either.

stevieturbo

Same test as above.

This time hooked power up to another car with its engine running, at idle.

Batt voltage during test was 12.8v ( pumps are wired straight to battery )

20 seconds gave about 2.6 litres. = 468 lph at 66psi

Getting the car to run at a fast idle, Batt voltage at start of test was 13.3v although this did drop to about 13.1 during the test.
This gave 2.7 litres over 20 seconds, about 486 lph then at 66psi.

Overall, Im pretty happy with this result. Also seems a single -6 line can pass a fair bit of fuel too, as ultimately this is how the fuel made its way to my measuring jug.

onfire

iTrader: (17)

Kinsler flow was at 13.2V. Two pumps at 66psi should flow 496lph in a perfect world. I'm surprised you have 486lph with all of the connections, etc. Nice system.

Flexible also....if you need more flow, up the injector size and lower the FP.