After looking at the BOSCH 044 pumps , I've decided that they may be a bit too expensive right now ( I hope to be Buying an OS twin disc clutch soon , and the holidays are here) , so I am looking at a cheaper but effective alternative. Used stock parts for Jap spec cars are fairly cheap and abundant down here , so I am thinking about putting a pair of SUPRA TT or 300ZX TT pumps into my tank and T'ing their supply into the discharge of the A1000 and using the E6K to start them when required . I know a couple (if not all ) of you will say that its over kill , but with fuel I would much rather have more than less , I DO NOT want to pull my engine again , and as I said the cost of those pumps wouldn't be a REAL factor , and I would be more than able to install and set up the whole system , let me know what you guys think. https://www.nopistons.com/forums/pub...IR#>/smile.png https://www.nopistons.com/forums/pub...#>/biggrin.png https://www.nopistons.com/forums/pub...IR#>/wacko.png https://www.nopistons.com/forums/pub...IR#>/bigok.gif

It sounds like you aren't going to run the supra pumps all the time. If you do this the pressure in the system will drop whenever you don't have all the pumps running at the same time. You can try it, and it might work as long as you run all the pumps all the time. I would try running the two Walbro 255L high pressure pumps all by themselves Y'd into the one -8 line(this is what I use). I know this setup will do 1.8kilo of boost on a secondary bridge w/ T51S, static fuel pressure of 3kilo, 4x1680cc inj, with no drop off.

Igy,

I wanted your opinion on the BNR33 GTR fuel pump? According to some test flow results, they outflow any "in-tank" pump upto 75 psi.

why would the system pressure drop when the pumps switch off ? , when they kick in their discharge pressure should equalize with the system pressure , the FPR should handle that . What I am looking for is more flow , my FPR (PAXTON) is supposed to be sized to flow 1000HP worth of fuel .

I'll use myself as an example; Running 2 pumps static fuel pressure of 43psi. One of the pumps stops working, fuel pressure goes to around 20 psi and car stalls. Another example; I was running one walbro pump, static fuel pressure of 43 psi. I installed the second walbro and the fuel pressure goes to 60 psi. Unless you have a little troll or a magic button that adjusts your fpr on the fly, turning pumps on and off is not going to work.

Stock R33 GTR pump only flows 210-215lph. Tomei makes an aftermarket upgrade GTR pump that flows 275lph, but I seriously doubt anyone wants to pay the $450 that the pump costs. A little birdy told me that the Bosch 044 pumps flow 280lph. Is this true? A friend of mine just installed a dual Bosch 044 setup in his car last week. What is the cheapest people are getting these pumps for?

IGY,

Incase you didn't know, APEXI BNR33 GTR fuel pump is the Highest flowing intake fuel pump out. There are numerous sites that say this. Here is a link to Maxcoopers site http://maxcooper.com/rx7/parts_info/fuel/p...pexi_bnr32.html



and another link

http://www.stealth316.com/2-fuelpumpguide.htm#j8



I don't know how much power you're making using the tiny Walbro fuel pumps, but they're not highly regarded here in the U.S. by ANY of the top runners.

it is never a good thing to go cheap just get the twin bosch pumps and be done

Well as a comparison, I remember a black FD3s with twin walboro fuel pumps beating a 20B TII with a TEC III and a T-76 https://www.nopistons.com/forums/pub...R#>/tongue.png



Ask Dragon what he's using in his 20B. https://www.nopistons.com/forums/pub...IR#>/boink.gif

I dont really see a problem with running dual walbros. Thats what im using in my setup (havent ran it yet though). If someone can give me a good reason why it wont work i'd like to know. looking at 20-25psi.... so far the numbers add up for it to work.

https://www.nopistons.com/forums/pub...DIR#>/wink.png That brings a smile to my face

The Walbro pumps don't have the reputation for reliability that the Bosch pumps have. I got a Walbro pump a few years ago, and it went bad after about a month, and I ALWAYS had to crank the car twice to start it.

Isn't there two different style walbro pumps? A high pressure and a "regular" one? I think IGY is speaking of the HP ones.

Did you wire it with the stock wiring? The walbro pumps don't like the 6volts that the sock wiring puts out at idle.

I guess you forgot to put the APEXi in your first question, so I assumed stock. 310lph is pretty impressive.

Hey Jim, don't tell the supra guys, virtually all the big hp(700-900rwhp) are running dual walbros, but they're probably just guessing. https://www.nopistons.com/forums/pub...DIR#>/wink.png I suppose 9 second 1/4 miles don't count as "top runners, LOL. Missin ya Jimmy

BTW, I was going to use your Stealth club link to show you that you're mistaken, but you've already done that for me.

Hey Jim, don't tell the supra guys, virtually all the big hp(700-900rwhp) are running dual walbros, but they're probably just guessing. https://www.nopistons.com/forums/pub...DIR#>/wink.png I suppose 9 second 1/4 miles don't count as "top runners, LOL. Missin ya Jimmy

BTW, I was going to use your Stealth club link to show you that you're mistaken, but you've already done that for me. [/quote]

Carl, You're the best! https://www.nopistons.com/forums/pub...1047683894.gif

Guys,

I'm not trying to start an argument here. I respect everyone here especially people like IGY, who has a BAD ASS FD! I just think its really confusing when you have reputable people stating different opinions as fact. Soooo, if anyone was offended by my post, I appologize. And I would like to see Dyno sheets from Carls AWESOME and RARE SUPRA, pls. https://www.nopistons.com/forums/pub...IR#>/bigok.gif I think you're one lucky dude Carl.

I would like to know a couple of things, if WALBRO is so great and affordable, why would anyone use anyother fuel pump? Maybe PORCHE and many other SUPER CAR manufacturers should save some money and use WALBRO as OEM pumps.

I have a walbro, just one, in the tank, making 400hp. stock primaries,1600 secondaries, aeromotive regulator. My car NEVER runs lean, starves for fuel, ect. I love the walbro pump, had it for over 2 years, works great, no complaints.

Oh and BTW, it's ******* obvious that manufacturers like porsche will use bosh pumps, everything in Germany is bosch. Walbro pumps do come stock in some american cars, and many a fast track car use them. So don't knock what you don't know. I'm not defending it becouse I have one, I'm defending it becouse I know about them

I'm not to sure on what a track inspector might say about running the setup you are talking about, and in all honesty if youplan on running dual Walbro's into a single bosch you might find you are acctually restricting it more than helping it, you will have to deal with the restrictions of the fuel lines, if you push the 500+ liters of fuel into something that can only push 300 then you create a restriction. Now I have seen twin Walbros running on Scotts blue car, and twin GT-R pumps (R32 stock) in Fergys R31 Skyline w/ RB26Swap and 720cc injectors. Both cars never really suffered from fuel starvation or fuel pump failure, although Igy may know something different on Scotts car, but I do know both of these cars are at far higher power levels than your looking to achieve and both do fine with twin intank pumps

Who are you (camel) refering to , me ? , If so my fuel lines is -8AN (5/8" I think) , and I want to tie in the discharge of the twins into the A 1000 discharge , not go through the pump.

Jim, I just pulled the manifold for porting(it's cast, I know, I know https://www.nopistons.com/forums/pub...). I would Imagine ~640+ on race gas, and ~525 on on 91. I really do not know, I had major boost creep initially, and had to pull the whole set-up. It was only in for a day, aargh........I had to switch from anMy Webpage Innovative wastegate to the 60mm HKS GT wastegate, in order to do this, I have to add material to the mounting flange, and then port match it to the new wastegate. Jim, where did you read about my Sup(just curious)? I just just put a bronze six puck in that car, that is one tough bitch to drive in stop and go commute, but it is fun to spin the tires on the 2-3, and the 3-4 shift. Anyway, I know you are mainly givin me a little **** cause I have no dynos https://www.nopistons.com/forums/pub...>/rolleyes.gif

Anyway, if you are serious, thanks for the props.

On topic, I think that there are lots of choices out there, just depends on what is proven in the particular car. I suspect that the bosch pumps may oulast the walbros, but they do roughly the same job, and cost more than twice as much, the bosch pumps certainly won't last twice as long, so why spend the money? For certain there are Supras out there with 30,000 miles on the walbros, and I have not heard a complaint about longevity on Supraforums before. I have heard several complaints about the longevity of the Supra pump when run on 12+ volts. I think most everyone on here can come up with something that will work, but I think saving ~300.00 for pumps that do the same job is worthwhile. This is a forum, the different points of view are what make it so valuable, Jim's right about the performance of the apexi, but it is certainly not the only solution, anyway peace, and I will post dynos on the Supra as soon as I get them.

BTW, Jim, do you have a divided manifold that will allow me to fit a T66 on the FC?