I posted this in the Type-R forum, but didn't get an answer. What is the flow rate of a stock ITR fuel pump? How much HP will it support? I know that with larger injectors I don't need as much fuel PRESSURE, but I will still need a larger VOLUME of fuel. Thanks.

 

bump

 

ITR fuel pumps have the same flow rate as GSR, LS, Dohc vtec applications.

do search under creator "Si Foo" or "si foo" he had a very similar post not too long ago in the ITR form.

if your going to get a NEW OEM ITR fuel pump you might as well get a Walbro

 

QUOTE=Charlie Moua]ITR fuel pumps have the same flow rate as GSR, LS, Dohc vtec applications.

do search under creator "Si Foo" or "si foo" he had a very similar post not too long ago in the ITR form. [/QUOTE]

Thanks for the tip, but I had already seen that thread. There was a "guess" of 131 l/hr. I was wondering if that was correct, and if so, how many HP would that support?

 

Airtex arted the civic and integra pumps at 55GPH which is 207 LPH. The pumps won't push 207 LPH because the volts sent to the pump have been reduced. If you rewire the pump with 10 gauge wire from the power distribution block back to the pump you should get full ponential. I have a B20 in my civic with the stock pump and haven't leaned out yet. The stock fuel system is capable of more than you think. It is the injectors that are the weak link.

 

Rail pressure makes a difference. Basically, the flow capacity of a pump decreases with increased pressure. So anything that increases the pressure to which the pump must pump (like forced induction or a fuel pressure riser) will decrease flow capacity and thus ability to feed a given power level.

 

That doesn't sound right. If incressing pressure decreased fuel delivery, why would all fuel pressure regualtors increase fuel pressure under engine load? The pressure increases to respond to engine load. More pressure is needed at the rail because the injectors are held open longer in response to higher engine loads. The extra pressure keeps fuel pressure from dropping due to longer cycles of the injector pulse and ensures that the fuel pressure won't drop during this causing a lean mixture from not enoough fuel. Fuel pumps are made to work like this. Basically the restricted flow (and increased pressure) of fuel from the fuel pressure regualtor and increased rail pressure is used up by the requirement for more fuel and longer injector pulse widths. and the pump flows on...

 

I think this is what StorminMatt meant about the stock pump: You can have high volume at low pressure, or low volume at high pressure but not high volume at high pressure. Increasing pressure doesn't decrease volume, but it decreases the upper limit of the volume you can push.

 

are we talking volume in flow from the pump or volume consistency in the fuel rail? Why would Walbro sell high volume high pressure pumps? Like flowing 200 LPH @60psi? That is high volume and flow...right?

 

Fuel pumps are rated based on volume of the flow from the pump. So this is what I meant by volume. Increasing pressure does not reduce fuel delivery. Increasing pressure increases the amount of fuel that is delivered to the engine. However increasing pressure DECREASES the amount of fuel that a pump is CAPABLE of delivering. It takes MORE power to push the SAME VOLUME at a HIGHER pressure. A pump's flow capacity will decrease as the pressure increases. A higher flowing pump will support more HP. The higher pressure rated pumps will support more HP across a broader range.

 

Man, I just don't see the connection It's too contradictory for me. Most fuel pumps drop off flow rates after 60 PSI. Where were we going with this anyway?