This test is useless. The pumps need to see head pressure. The twin pump setup has been tested before by many reputable people. Under pressure you get around 50% increase in flow running two pumps into one line. Not 100% like you current test is indicating. people needing to run a twin pump setup will be running upwards of 40psi. with a base of 45psi you need to test the pumps with at least 85psi head pressure. A major magazine just tested like 15 pump setups. The pump that really impressed was the weldon a600 pump. Outflowed a bosch 044 pump with half the current. msrp of like 360. plus it can be mounted intank or inline.

 

That was done just out of curiosity, dont worry I will get a professional flow test done with pressure applied.

 

FullBlown, I would also wonder if there would be any temp difference between the two pump/stock line vs. two pump -10AN line from prolonged use ie. road racing. I'd bet the stock line would heat up the fuel faster so there may be benefits to the larger fuel line other than flow potential.

 

Drifto that is a good point, although how much more heat it would produce? I wouldnt be able to answer that. Perhaps someone with experience could chime in.

 

Fullblown tested the single pump at 0 psi to be 8lb14oz, which is 8.875 lb/min. 8.875*60= 532.5lb/hr.

Where are you getting the 100 lb/hr difference? I see about 15 lb/hr difference.


Eric

 

Thanks bro, i didnt even catch that. 15lbs is pretty close for a "garage" test.

 

You're correct. About 17.5 lbs/hr difference. Typing too fast for my brain to keep up

 

Fullblown, don't let the haters get you down. I think the test was interesting. At first I didn't know where you were going and was thinking some poor thoughts.

I did a lot of work on ours before I put it to the test on the cars. The pumps were all flowed first but the actual unit I didn't do until I was confident in that it would flow enough to make it worthwhile.

I contacted Weldon, I have a great tech guy over there we have used for years with the tube chassis race cars and such. He told me a 5/16" line will flow enough for 1,000 flywheel hp if you are pushing through it.

I find it very interesting that you came up with basically the same thing in your testing. Thanks for doing it.

Our fuel system is getting sent out this week to be flow tested on a test bench at full pressures.

 

Thanks David , I am anxious to find out how it turns out. I got ours boxed up and and ready to be sent out to flow test as well. Our test is going to be done with the regular 255 walbros. Itll be interesting to see how they flow against the HO's
( no im not talking about dirty females) Im sure the HO's will beat those regular walbros. We are going to be doing it at 13.5 volts, Let me know what voltage you are going to run at and perhaps we can keep it close. Thanks L J

 

I think im going to pick up a e85 unit from you.

Im going to be a cheapass with my evo.

Just TBE + E85 = 30psi :P = 350whp+

 

God I can't wait to pick up one of these for the Srt. Your fuel pumps look so sick. keep up the good work FBM

 

Thanks Joe, the srts shouldnt be long . Jordo let me know when you are ready.

 

good read !