Hey Powell, about that Weldon 2345 fuel pump, where do you fit it? in the front boot? can you please elaborate in the installation process of the weldon pump?

 

I am quoting this from MoTec, "In basic terms the amount of fuel you require to properly feed your engine depends on how much power you intend to produce and what rail pressure you wish to run. Typically a gasoline engine will require .5 lbs of fuel per hour for every 1 horsepower produced. If you have a 1000 horsepower engine and you intend to run 60 PSI of injection rail pressure, you will need a pump capable of delivering 500 lbs/hr at 60 PSI. Remember that a pump capable of delivering 2000 lbs/hr free flowing is worthless unless it can deliver the proper amount of flow at the pressure you want to run. Typically increasing pressure decreases a pump’s volume output." That is crank hp boys

 

I do not really like to get to deep into it because of some members and what they hear or think they see. But Safe fuel system for a turbo'd 6 cylinder making 650-700 crank hp is 6, 120lbs injectors with a rail pressure of 55psi and a fuel pump that can pump 420 liters per hour @ 55 psi. That is safe. The stock pump is 150 liters per hour.

 

*gasp* Tim you speak of the voodoo of real math actually being applied to oour cars fuel system? Insanity !

what DC did you calc that scenario for anyways?

 

Hey Tim, let me make on observation (may be totally clueless lol). Why does a 75% increase in power require a pump that elaborates 3 times the fuel volume as the original one?

 

80% with a BSFC of .65

 

[quote=emadelta86;3191670]Hey Tim, let me make on observation (may be totally clueless lol). Why does a 75% increase in power require a pump that elaborates 3 times the fuel volume as the original one?[/quote

Not all that fuel is being used, the pump needs to be able to move a larger volume of fuel then is needed and not loose pressure while under full load.

 

[QUOTE=Tim941NYC;3191850]this is calculated usging no rising rate fpr or a 1:1?

 

1:1 @ 20 psi boost.

 

thats where the big difference is the proper way to do it, versus what everyone has been doing to bandaid the stock system to cramp PSI through it for more flow.

 

There is a safety factor that keeps getting lager too. For ease lets use 10%, 10% of 150 liters is 15 liters. 10% of 420 liters is 42. The safety factor is there for a reasons. Say there is a voltage drop and you lose 5% of you pumps flow on the 150 liter pump that's 7.5 liters and on the 420 liter pump it's 21 liters. How about boost creep or boost controller problems the map sensor will read that and adjust the injector pulse with. Your ambient air changes and now you are make more boost with out any change to your setup. Safety factors are needed.

 

Wow I have to completely agree...

But now I'm scared to say the least...LOL!!I want to upgrade my pump now...but I don't trust inline pumps, and given your numbers even two parallel 044's are not enough..

I wouldn't mind buying one of those big weldon pumps, but I have no clue about how to fit them in the car and provide the adequate scavenging from the tank LOL!!!

 

[QUOTE=emadelta86;3192029]
But now I'm scared to say the least...LOL!!I want to upgrade my pump now...but I don't trust inline pumps, and given your numbers even two parallel 044's are not enough..
QUOTE]

my two 044 parallel pumps handle 980rwhp. We have seen as much as 1100 rwhp. Sure we used custom lines etc etc... this at 4.2 bar FP. my car made those numbers with 750 cc... no problems...
two series 044s seem to go out at around 750 to 760 rwhp on 630 ccs... again..
Im sure there are other methods to achieve safe HP but lets not be fooled.. there are many cars runing around with parallel and series 044s... I still have yet hear someone blowing up a motor due to poor fuel delivery...
just my opinion...
mark

 

Mark, there is something quite off with your numbers. 890 rwhp with only 4.2 bar fuel psi using 750cc fuel injectors. There simply is not enough fuel being burned to support those hp numbers. I am not saying you are not making that power just that the injector or the fuel psi is different then stated. If any one would like you can go to RC fuel injectors web site and use there fuel injector work sheet. I used you numbers and the only way your 750cc injector work to make 1000 crank hp is with using .50 brake specific fuel consumption (turbo you use .65) and a .99 duty cycle with 4.2 bar (62 psi) fuel pressure. I agree that there work sheet gives you a good safety margin but motors are expensive and even more so when you make power like this.

 

I like Tim941NYC because he is the American version of Jean