Which Intank pump for at least 550whp?

[tsiawd98]

OK Quick question. I have a fully built engine. and am planning on low 11's to mid 11's. I would like to know if anyone knows of an intank fuel pump that can supply enough fuel for between 500 to 550 whp. And Im going to use -8 fuel line from tank to rail. So the pump would have to supply enough volume of fuel and maintain the pressure of 43psi in the line.

I have a walboro 255hp but I honestly don't think that this fuel pump will supply what I will be asking from it. So would a supra tt work, or a cozmo. or whatever is out there? I do not wish to go in route with a inline pump also. If someone could chime in on this it would help out alot. thanks

 

[desolateboosted]

some people have hit 600whp on the walbro 255 hp

 

[tsiawd98]

Thanks for the reply. and i understand that but they might have been using the stock fuel line. as i will be using -8 to the rail and need to know if it can keep up the volume and psi in the line.

 

[iwantawd]

then just go with a supra pump nuff said

 

[anconover]

supra or cozmo.

 

[RavenX]

you can always rewire the walbro...same as the supra

 

[Car Cannibal]

I would use the Supra and hot wire that pump. You say at least 550, so if you push it into the 600 range, I would want some security.

There is a thread about a dual pump assembly that you might want to look into with dual 255's. A shop makes a SS pump assembly and could probably do one for both pumps.

 

[eyebrowski]

you can always rewire the walbro...same as the supra

Where did you get this information? Certainley not from RRE's tech articles...

 

[Mirage2LTurbo]

You could run a -20 line if you want, as soon as the line is pressurized the same amount of fuel will only need to be moved through it no matter what size the line is. 600whp on a -6 or 600whp on a -8 the pump still pumps the same amount.

 

[RavenX]

Where did you get this information? Certainley not from RRE's tech articles...

Get what information...All of my dsm friends have told me to rewire the fuel pump directly to the batter so it gets a constant 12volts. I have also read this in numerous threads search on it

 

[16g-95gsx]

You could run a -20 line if you want, as soon as the line is pressurized the same amount of fuel will only need to be moved through it no matter what size the line is. 600whp on a -6 or 600whp on a -8 the pump still pumps the same amount.

Hit it on the head. The problem with forced induction and fuel pumps, isnt the volume, but the resistance. When trying to maintain 43psi (not IN the rail, 43psi ACROSS the injectors, in the rail you're going to be seeing closer to 73-78psi at those kind of HP levels) it isnt about flowing shear volume, but rather the ability of the pump to overcome resistance. Pressure is a resisting force on the pump motor itself, and thats a force that in order to pump fuel it must overcome, so the higher the pressure, the less the pump will be able to flow. If you're asking this question I honestly dont feel that you are going to, nor are you ready to make 550whp, but if you must ask Id say the Supra pump is your best bet. You're going to have to look at flow rates of the pumps, and decide which one more closely matches what you're looking at needing. A 255lph will flow enough for around 64lb/min or so Id say remember back to numbers that I crunched just a short while ago, that should be enough for your application Id imagine, but Id use the Supra pump if you really are concerned.

 

[Mindslayer]

My goal is the same but i'm got a supra pump. At least I don't have to worry about it. You can get one new for about 250.00 Or be like me, I got a used one for 100 shipped.

 

[4gsx63]

SupraTT FP will outflow Walbro 255HP at any fuel pressure. It can hold higher fuel pressure than the Wabro if you're looking to run high fuel pressure and boosts. The PLUS are: it's much less noises but with theToyota(Denso) reliability. How do I know this? I'm running one on my car. Check out the RRE page for a comparison between FP. Hope this helps.

 

[diambo4life]

SupraTT FP will outflow Walbro 255HP at any fuel pressure.

That's not entirely correct. It (the Supra pump) will outflow almost any other pump till about 67-70psi in line pressure then the Walbro 255 lph H-P pump will begin to shine. Not to mention the fact that it's also very sensitive to the voltage used. It typically requires higher voltage (>14V) to flow as much. Personally, I would go with a Cozmo pump or any other higher flowing pump setup like the Aeromotive. The supra pump is really a 260lph pump at 12V and a 290lph @ 14V with the typical 43psi base pressure most of us like using. You really need to rewire it to see any benefit over the Walbro 255.

 

[16g-95gsx]

1g's use lower base pressure from the factory, but if you are honestly aiming for 550whp, which I really think it appears its a goal that you might not realize what its going to take, id damn well hope youd have an aftermarket FPR, so the base pressure issue can be changed. As for the 12v vs the 14v issue, he will absolutely not have enough fuel with any of the DSM fuel pumps on stock wiring, it would most definately want to rewire his fuel pump anyway, as on the 12v wiring he would have some very sick tuning and race gas to achieve 550whp, and really itd only be hurting himself not to. The Supra pump according to RRE still flows more than a 255lph HP even at 30psi of boost, by about 20lph, so I dont know where the 67-70psi of inline pressure figure came from. To reach 550whp you will most definately be flowing 30psi or more however unless you wanted to use nitrous.

 

[CanadianTSi]

Chris Tapp Made 707 to the wheels with a 255...

 

[16g-95gsx]

220.8lph from 14v on the 255lph HP at 14v and 30psi of boost, would bring the fueling limit of the 255lph HP to 74.395 lb/min of air assuming 12.5:1 AF, this is using VP's claimed 0.733 as the specific Gravity of C-16, so I can see that figure, assuming that losses from the motor were minimalized. Was this a FWD car?

 

[DSMu4ia]

Don't risk it on a $200 part.

Neither the Walbro or the Supra/Cozmo pump can successfully support those numbers. Alot of things come into play at that level however.

If you are a 1g guy, look into the Bosch pumps some of the guys are using (they fit into the stock tank with slight mods).

If you are a 2g guy, either do twin intake 255's, or a 255 intake and a 392 inline.

 

[diambo4life]

The Supra pump according to RRE still flows more than a 255lph HP even at 30psi of boost, by about 20lph, so I dont know where the 67-70psi of inline pressure figure came from.

No! With a base pressure of 43psi, the Supra pump will outflow the Walbro (not by much, we are talking 15psi or less here,) upto about 70psi - or 27psi boost then it will fall off and the Walbro 255lph H/P unit will outflow it. As you said, making 550WHP will require at least 30psi of boost and the Supra pump WILL NOT be the ideal pump if you want to be safe. If you don't believe that, time to do some digging.

Don't risk it on a $200 part.

Neither the Walbro or the Supra/Cozmo pump can successfully support those numbers. Alot of things come into play at that level however.

If you are a 1g guy, look into the Bosch pumps some of the guys are using (they fit into the stock tank with slight mods).

If you are a 2g guy, either do twin intake 255's, or a 255 intake and a 392 inline.

Amen!

 

[16g-95gsx]

Like I said "according to RRE's figures"

http://www.roadraceengineering.com/fuelpumpflowrates.htm

They show it as flowing more as you can see.

 

[iwantawd]

i was just gonna post that up

"(not by much, we are talking 15psi or less here,) upto about 70psi - or 27psi boost then it will fall off and the Walbro 255lph H/P unit will outflow it."

double the difference to 30psi, and wrong... the difference at 73psi is (edit) 20psi

 

[diambo4life]

Oh, don't forget to look at the Supra's current draw compared to the Walbro in that link you posted. Almost twice as much!

Here's a more detailed write up btw.

http://www.stealth316.com/2-fuelpumpguide.htm

FWIW, TurboSpoolinIns dynoed some 600 AWHP on the 255lph F/P with his FP T67.

 

[tsiawd98]

Yeah I definetly dont plan on running 550 with 91 pee water. I will try to do that with
c-16. I just plan a little over 400hp with 91. Trust me I have all the supporting mods done fuel pump already rewired and im going to use a sx fuel pressure regulator. I will be also getting some 880 injectors.

Thanks for the replys. But yes im looking for a intank pump which will give me a safety margin if i can pull 550 out of the eng.(with c-16)

 

[rdrkt]

some people have hit 600whp on the walbro 255 hp

Who? I know of one and if his fans came on he was in trouble as far as fuel pressure.

 

[diambo4life]

If you are looking to run low-mid 11's, 500AWHP is enough really if your car is not a fat pig. The Walbro 255lph H/P pump that you have will work just fine.