I have been doing research for about a month now trying to figure out what pump/s to run on my 20b for e85. I spoke with Ari the other day and he is suggesting somewhere around 170gph of fuel for my horsepower goals and some to spare. I have found a few options but Im skeptical of all of them in one way or another.

The options that i have found are 3 rp ( denso/ supra) pumps which doesnt seem so bad except that there would be a large electrical load from three pumps and also if one goes bad and I go to make a pass and i suddenly run out of fuel, game over.

The next option is 2 bosch 044 pumps intank while this would cover my fuel demands too bosch apparently does not approve their pumps for ethanol.

the next option that I found was a single fuel lab pump they have ones from 170gph to 200 gph and they do approve it for ethanol. the problem that I see is that a local supra guy I know was running one on e85 and had it for a few months and was really praising it when i ran into him and then that night it went out and we had to tow him home. Its possible it was a bad unit or maybe something else went wrong but it made me skeptical. So know i'm unsure of what to use. Also I want to stay intank. Any suggestions are appreciated.

 

This One >> Weldon External Fuel Pump D2035A Good for 1800 HP!!! ForceFed racing used it my 20B They got over 1050 RWHP on the dyno afew days ago ..but not with E85 .. I know they have done a stright meth injection and would probably be able to help you ..http://www.bcrotary.com/showthread.p...ustom-meth-kit

 

Shameless plug: I'm selling my never used Weldon 2035, controller, and FPR setup.

PM me if you're interested.

 

I"m thinking about this as well. I actually have 3 ND pumps.... but wasn't sure I wanted to go through mouting them etc. I share the same concerns as you with a single failure, though I haven't ever had problems with them. I am unwilling however to run a pump that sounds like a jet I'll be interested to hear what others think.

 

what are you using your car for? external pumps are loud and annoying..

i know a few ppl using boshes with e85 and they work just fine with no problems.. i think this is your best bet.

i have never used a fuel lab pump but a few ppl told me that they are crap.

 

I currently have two RP pumps but i really want to stay intank not to mention i don't think that a Weldon pump would be streetable. If I ever got stuck in traffic an external pump would probably overheat. I'm leaning towards the fuel lab pump and the twin bosch 044 pumps mounted in tank. The only issue that i see with the Bosch pumps are that I see a lot of different quotes for how much fuel they pump I have seen the are around 400lph and then Ive seen quotes saying they are comparable to a Walbro which would mean a 255 pump. so It makes it very difficult to calculate weather or not they will supply the fuel I need. the good thing i see about the fuel lab pump is that if it goes out the car just doesnt start. If I have multiple pumps and one goes out I won't know it till I go WOT and the motor detonates.

 

does anyone know what the bosch 044 flows when mounted in tank without a pump feeding it?

 

i dont know exactly how much they flow intank but 2 of them feed my 3 rotor @ 25 psi just fine..

if u planning on going e85 i'm sure you are going to need 3 of them for high horsepower

 

Ive heard anywhere from 255lph to 400 lph. If they only flow 255 then i might as well just use my RP pumps that I currently have and then just add one more since they are smaller and easier to mount. Im starting to lean towards the fuel lab pump it seems like it may be the only option for me unless I want to run three pumps. i would be willing to run two but not three. If the 044 pumps flow 400 lph then two would flow 800 lph or 211 gallons per hour.

 

what are you trying to achive? just e85 or what? ironmdx had to run 3 pumps to feed his 3 rotor @ 25 psi with e85.. e85 is going to burn/require 25-30 % more fuel which means bigger injectors and more pumps.

 

Here are tests which we did on my 044 fuel pump at friends work (he works in company who makes/tests fuel pumps for OEM apliactions and has access to proper equipment for testing)

http://rx7cz.net/pdf/Bosch044.pdf

http://rx7cz.net/pdf/Bosch044-13V.pdf

He did tests of other pumps too, results are in our local forums thread :

http://rx7.cz/forum/index.php?topic=74.15

 

I really like results we measured of VW/Skoda pump : 1K0906089A (made by Bosch for VW/Audi/Seat/Skoda)

One alone is nothing spectacular, but 3 of them will flow 465L/hour at 4 bar of pressure and only 15,6A (combined)

(Four of them will be 620L/h @ 4 bar and 20,8 A)

Two Bosch 044 pumps will do at same conditions 580L/hour at 4 bar of pressure, but it will take 27A which is serious load for not enought fuel...

I currently run one 044 pump, but have this Skoda pump ready to add to the system if necessary.

 

I'm shooting for 650 whp on my current t88h while on ethanol. I would like to have a fuel system that would cover enough for for 800whp with a decent amount of head room in the event that a fuel filter gets clogged or if any unforeseen complications where to occur. 800 whp is the most power I would ever want, while I don't see it probably even happening I would like the pump/s to supply it if I decided to do it. All i would have to do is use an appropriate turbocharger, change injectors and retune. bottom line I just want to solve my fuel issue as far as at the pump/s and worry about the injectors when i get to that point.

 

You're half-correct. One does need the weldon controller with the pump for anything but drag use.

 

I dont understand what you mean.

 

So I think I have come to a conclusion. The Idea of using three supra pumps will most likely be the best idea provided one doesn't go out. To combat this problem I'm trying to develop some system that would illuminate an LED light that could be placed easily in my view if the current draw to the fuel system dropped below a certain level indicating that one or more of the pumps were not drawing current and were therefore not opperating properly so I would know to not go WOT. any opinions on this idea or perhaps how to construct such as system?

 

You might try talking to Kinsler Fuel Injection. They sell their own version of the 044, which was tested along with several other pumps including combinations of two and three pumps in the recent issue of Dsport magazine. Kinsler sell and tests a variety of different pumps.

Another thing to watch out for is pressure loss thru the system. What's your setup for fuel lines? Try to avoid banjos or tight turning fittings - use long turn fittings, particularly at inlets to the fuel rails.

Jack

 

You correctly expressed that if the Weldon, or equivalent, were used full on during street use, it would overheat. I was just saying that they developed a controller that changes the pump speed so that their pumps can be used for street, autox, road racing, etc without having to worry about that.

 

gotcha. but wouldnt I have to change it whenever I decided to get on it on the highway and then turn it back down whenever I jsut wanted to cruise at 60 or 70 mph and then remember to turn it back up before I got back on the gas. it seems like a lot of work and God forbid I ever forget.

as far as my idea for the light I was thinking about using a normally open relay to illuminate the the LED. It would only close the circuit if the current dropped a bit from the pumps which would be enough to turn the insulated relay on and the relay would illuminate an LED light within my view letting me know that voltage had dropped meaning that a pump went out and i would know not to go WOT.

 

After considering it all I think the fuel lab pump would be best. Now I need a factory fuel pump bracket system. If someone has one for sale in good condition I may be able to set it up for the fuel lab pump. please let me know If someone has a clean unit