Official Dual Walbro Flow Test...
 

Ok guys the results are back. Here is the scan sheet. This was done with our Dual intank Walbro 255lph setup and at 13.5 volts. BSFC is the measurement of how many lbs of fuel it takes to make 1 horspower. Typically on gasoline it is around (.55) For example lets look at the chart. Ok at 75 psi it flowed 544 lbs per hour. If we use .55 lbs for 1 horsepower, we take 544 lbs per hour and divide by .55 and we get 989.09 HP!! got it?? :)
Oh by the way, this was with our stock line adapter kit. I wanted to test the -10 line but he said he couldnt do it. I am almost positive the -10 would of carried it further as pressure increase. OK enough heres the copy

** Ive got a few messages from guys asking if this is for sale already. They have been availble for quite some time now. Heres the link guys https://www.evolutionm.net/forums/sh...d.php?t=240892

http://i124.photobucket.com/albums/p...canMedium2.jpg

Full Blown Dual pump kit

http://i124.photobucket.com/albums/p...e034Medium.jpg

http://i124.photobucket.com/albums/p...e059Medium.jpg

What about the densos?? How many of you guys wanna see that beast tested??

http://i124.photobucket.com/albums/p...s010Medium.jpg

Cheers :beer: :beer: L J

Looks good, its alot easier then welding a sump in the tank and using a loud external pump.

me, me, me!

I just thought I would post to say you do nice work. Unfortunately, I won't be making enough power to justify such a setup on my IX.

Why even ask you know what the anwser is.:lol: {thumbup}

Do the Densos!

BTW, for turbocharged engines, the BSFC is usually closer to .65. Still supports 800+ HP at 30PSI...

Was the fuel connections for the Walbro test done with the connection and a 5/8" line to simulate the stock fuel system from tank to rail?

The more interesting thing to note is the lb/min of FUEL that the dual pump setup can flow.

Looking at the 75 psi numbers (43 psi base FP + 32 psi boost)

You see 544 lbs/hr of fuel. If you divide this by 60 to get lbs/min of fuel flow. You can see that you can flow ~ 9 lbs/min of fuel.

If you would like to make sure you have enough fuel flow at the fuel rail to support an overly rich mixture of 10:1 air fuel ratio. You multiply by the a/f ratio to get lbs/min of air flow.

9 lbs/min x 10 (a/f ratio) = 90 lbs/min of air flow at 32 psi of boost pressure

At a more realistic a/f value for race fuel and high boost the numbers go up.

9 lbs/min x 12 (a/f ratio) = 108 lbs/min of air flow at 32 psi of boost pressure

You can see that this fuel setup will supply plenty of fuel to run even the largest turbos that we run on Evos.

BSFC assumes an a/f ratio to get a certain lbs/hr per HP. This varies. But you can also work the number as shown above to see how much Air flow this fuel pump can support.

FYI, for an approximate estimation, you can estimate roughly 10 whp per lb/min or air flow, so at 108 lbs/min, that is roughly 1080 hp at the wheels at an a/f ratio of 12:1 . The 20G-LT is a 49 lb/min wheel, and roughly will make a maximum of 480 to 500 on a dynojet.

Brian

I agree 100%. I tried to make this point in a few other threads about mass airflow, fuel ratios, and BSFC.

I always deal with mass airflows. It is also much easier to compare it to a compressor map for the turbo that you are using.

One note that I would like to add is that our 2.0L engine won't make 1000 HP at 30 psi, no matter what turbo you are running . So, it is very important to look at the fuel flow at the boost pressures that you will be running. For example, 50 psi boost will be 93.5 psi fuel pressure (assuming standard base pressure), so you must take the mass fuel flow at 93.5 psi fuel pressure to see if this will flow enough for 50 psi boost.

Great tests, LJ.

Eric

Thanks guys, ill try to get the denso's tested. Also this was done with the 5/16 feed line from the stock line kit.

nice...

Yes please.. {thumbup}

I would imagine it will flow a little more up to about 70psi, and then pretty equal above that.

How soon can we expect results on the dual Denso's?

You made up the dual Denso assembly pretty quickly, how hard would it be give people even more options? Maybe dual Weldon 600A's? Just an idea... they flow a little more than Bosch 044's, and draw a lot less amperage. I'll probly be ordering the Denso assembly pretty soon here, but since it didn't take much work to modify the original Walbro setup, you guys could keep goin with this, and have the Evo fuel pump market all to yourself. Sorta.

Haha, no more!!! The densos seemed like it was fast but trust me I worked OT on it. The bosch seems to be too long from the pics aswell. Just let me know when you are ready. Thanks man

Ill have the results for the densos soon.