Just wanted to know at what stage a single pump becomes obsolete?

My Last trip to see Mark@MAD he said I was running a little lean at the top end and may have pump issues!
Well I'm planning to take it back soon for a little up in power and wanted to have it ready for him.
Hopefully I'll get a chance to check flow this week on the single pump and have been advised I will need around 4.5 liters per min??

Bosch quote the 044 pump as 300 LPH so 5LPM and 72.5 psi am I chancing it running close to the max output of the pump or does the fact that I will hardly ever be flat out mean that a single is sufficient?

Mark also said that the leaning out at top end could be to do with the Aeroquip a1000 regulator I'm using! So I guess they are either shit or it may need adjustment.

Any imput Appreciated

 

How are you going to test the pump?

 

Is there not an argument that favours one better pump compared to two others (simpler plumbing, and if a single pump stops working suddently then the engine dies with it, rather than losing 'half' the fuel if one of your twin pumps dies and leaning out massively as a result..which is potentially worse for the longevity of the engine when you're giving it some stick)?

This is all hearsay mind, I do not know enough to argue one way or another, but it seems somewhat logical, but I would be interested in arguments around the idea of a single better pump versus two....if nothing else than I would learn from it.

 

I remember doing the test but forgot exactly what the outcome was, Im sure it was around 450atw so around 500bhp..

 

im sore mark says an 044 can flow up to 600bhp

 

just a word of warning,, its bad to judge fuel pumps by horse power, and different engines use different amount of fuel to produce different powers (BSFC)

 

Very crudely!
Take the return off the regulator aim it at a bucket start the car and time 1 minute.
The car may run rich for that minute but will only be idling so shouldn't cause a problem
Or better still liven up the pump relay so the car doesn't have to run

 

This is my take on things, but I was after some advise off of someone that has experienced this problem

 

i wouldnt do it with the car running myself, just get the pump to come on,, plus pump up the regulator. (max boost pressure+fuel static pressure) this way the pump is under working load.

 

Surely it'd be worth giving mark at m.a.d a quick ring to ask his opinion regarding what he would recommend pump and/or regulator wise, if you've already been to him and are planning on going back....plus i guess he knows the car/spec?

 

Testing like he describes is viable. And you will be testing the pump at it's normal operating voltage ( although at a reduced test pressure )

With engine off, voltage will be down 2v or so, which makes a good difference. Or you could call it a safety measure for the purposes of the test.

If doing it for 1 minute, make sure you have a big enough container.

You could power the pump manually, adjust fuel pressure to say 70-80psi and measure flow out the return.


Of course another check you can do is find out what your fuel pressure is currently doing under load. If it's holding stable with boost then chances are the pump is coping fine.
And also ensure you are getting 14v at the pump at all times.

 

Mine's still on single 044, but will be going up to single Automotive pump same as Rod's before the next top speed run.

 

Voltage at the pump is spot on running 14v+ due to the fact it's wired via 2awg cable
I know the regulator is rising psi for psi (fuel/boost) just need to be sure of flow.

What I really wanted to know was at what Point does a 044 become obsolete?

 

Well if fuel pressure is continuing to rise with boost and hold steady, and injector duty cycles remain within safe limits. Your current system is coping just fine.

As for how much power can an 044 cope with ? That varies around the world for some unknown reason. Ranges from 400-750bhp.
Needless to say it supports more power in the USA than anywhere else in the world lol.

Over 600bhp though, it's going to be getting pushed hard and upgrades would be sensible if it will see hard usage at those power levels.

 

If ade is still running one at 670bhp then it becomes obsolete well after most people will ever reach id say

 

just read specs of a 044 pump, they only flow 300LPH at 43.5psi, they drop down to 200LPH at 72.5psi.
if you are running lots of boost then, i'd fit two or go for one big aeromotive.

 

Dont believe everything you read. Unless you test the Bosch, or indeed any pump you wont know exactly what they flow.
But they certainly flow more in the real world than you suggest. Bosch themselves only quote 180lph for it.

Aeromotive's are huge and there are many who would question their reliability. And at high fuel pressures they dont perform as well as a Bosch at high pressures. ( If of course you will be using say 80+ psi )

2 pumps isnt an ideal solution either. But Bosch's reliability is without question, as is it's performance.
I dumped my Aeromotive in favour of 2 Bosch pumps a few years ago.