Hello,

I have a simple question.....I currently have an in-tank Walbro FP as a feed to a small surge tank out of which I will install either one or two Bosch 044 pumps going to the fuel rail. This is in the experimental stage. My question is:

Even though I understand that the Walbro is only there to fill the surge tank would it be enough to keep up with this system if I use E-85 considering the increase in fuel consumption?

How much whp or hp will a single Bosch 044 support on gas? and on E85? I don't know the exact specs of this pump and most guys I see using them are using more than one so its hard to pinpoint what its capable off on its own.

Thanks in advance.

Chris

 

Anyone with input?

 

If your two bosch pumps flow more fuel together than your single walbro, wouldn't your surge tank just empty out?
What would be the advantage to this system compared to others?

 

This is how surge tanks work to my understanding. The feed pump is usually smaller.

Someone correct me if I am wrong:

The return line from the one/two bosch pumps(depending on what I choose) dumps back into the surge tank. Because the engine doesn't use the full capacity of the bosch(external) or walbro(in-tank) pumps it just goes back into the surge tank through the return keeping it full. When you floor the car your consumption goes up but its only highest for that instant where you are at full boost and high rpm, at this point yes it does go down in level slowly but as soon as you let go of the throttle it fills back up for the next time you floor it. The trick is to have a surge tank large enough to keep the engine fueled at maximum load/power for a full pass in the highest gear or depending on your needs. Because of the way the surge tank is shaped it helps prevent cavitation that is sometimes experienced when running a car under 1/4 tank and high g loads. If the in tank pump cavitates it wont matter because the surge tank is full and the big pump has a constant supply of fuel. Using this system you don't have to worry about having a small in-tank fuel pump because your HP levels will be determined by the pump feeding off the surge tank. You also eliminate the issues that occur when your tank is below 1/4 full.

My question was regarding the whp capability of a single bosch 044 pump so I could determine whether I need two for my application(hoping I don't)

Thanks for the reply.

Chris

p.s. Anyone else have input?

 

Anyone have an idea of the whp capability of the Bosch 044 with e-85?

Thanks

Chris

 

A local car up here is running a single 044 and is just shy of 500whp.....on dinosaur bones though.

So I'd expect roughly 30% less power on E85, given that 30% more fuel will be needed for a given power level.