Alternatives to Dual Walbros

[Winnipegman]

What alternatives is there to dual/tripple walbros?
I want to keep the fuel tank. I need enough fuel to support 1200hp on 1600cc injectors.

[TT_6SPD_95]

Originally Posted by Winnipegman

What alternatives is there to dual/tripple walbros?
I want to keep the fuel tank. I need enough fuel to support 1200hp on 1600cc injectors.

My question to you is why would you not just go with something that is proven time and time again on the Supra? ....and yes...of course there are other alternatives to dual walboro's. There are 100's of different fuel pumps out there on the market.

Do you like the extra noise from an out of tank pump, or do you want the pumps to be quiet as possible?

[chidoks]

weldon

[SupraGodTT]

two stockers

[damianhindley]

If the stock fuel sys is good for 450-500hp what does dual walbros bump it up to on stock lines? I guess I mean at what power do I need to look at replacing the line vs just the pumps and injectors? thanks

[Morefaster]

The stock feed is just slightly smaller than -6. you can use the stock return for most hp levels, but once you add a second pump you need either a second feed line, or a larger (-8 or above) feed....
personally, if you are single, you need to replace your fuel system with either a second denso pump or dual walboro's, injectors that are 720cc or larger and a 2nd feed (-6)....in hind sight i would have run a second feed instead of a single dash 8 the reason being is that ther eare two y's in my system now that i could have eliminated....

[damianhindley]

So your saying keep the stock like and just add another like to the oposite end of the rail? That has to be cheaper than a single huge line. Hum, any write ups on this? thanks for the help

[Morefaster]

Originally Posted by damianhindley

So your saying keep the stock like and just add another like to the oposite end of the rail? That has to be cheaper than a single huge line. Hum, any write ups on this? thanks for the help

yes, just add a -6 line to feed the other end of your rail. used the stock line/ fuel filter for the other end (you'll need the damper bypass line) it will save you a little money, but more iportantly less areas for leaks....no need for a y in your tank, no need to y again to feed either end of the rail....youll need to drill a hole in your pump hanger and install a 90degree bulkhead fitting...that is probably the most difficult part....summit has all the parts you need less rail and injectors

[damianhindley]

so with a walbro costing 100bucks whats the rest of the stuff add up to ball park? I know that line has to cost a bit.

[Morefaster]

this will even give you a little spare
http://store.summitracing.com/partde...5&autoview=sku

here are the fittings
http://store.summitracing.com/egnsea...115+4294906722

don't forget a filter
http://store.summitracing.com/partde...5&autoview=sku

You'll need a few other fittings and some adaptors, but it's really not that bad...

[Winnipegman]

I have had a walbro die on me twice now. That is not good. I would prefer a single pump so that IF it dies at least my car will shut off instead of going very very lean. I heard that in order to have an external pump I need some kind of sump in the tank??

[damianhindley]

I had one die on my civic on the dyno, car would not make over 250hp pumps flow was garbage, swaped it out and was good to go. But out of the 5 i have ran it was the only one to fail. and it was 2 years old.

[Magic]

Talk to Dana at Virtual Works or Larry at Sound Performance. Both of them have made top feed systems for the Weldon external pump. Make sure you use a Weldon rated for continous duty. You can use a voltage regulation module to step the voltage down to 9 volts for street duty and this will make the pump much quieter. When makig big power you will need to feed the pump with 12 volts.

Expect to spend close to 3 grand for the Entire fuel system including the injectors, pump, filter, lines, top feed system, voltage regulator, etc.

You can add me to the list of people who have had a Walbro pump fail on them. I have three new walbros sitting in my garage and I am now weary about putting them in my car after my current walbro has failed. The pump that failed has been in my car from about 5 years with no changes to the fuel system.

[Morefaster]

my fuel system cost me about 1200.oo
its just dual walbro's with 850's and a titan rail....no weldon action

[6BOOST]

Out of interest for everyone, Peterson make in tank filters that come in straight and 90 deg, and have a range of different tube sizes so you could make them fit various pumps. You could run almost any pump intank I would have the think, they are obviously all fuel proof, I can't see any issues with submersing any of them, and I'd much prefer a single pump over duals.

On another note, on a car we did years ago, I used 2 fuel pumps, and 2 separate fuel lines for pressure feed to either end of the rail, and as a failsafe, we put an autometer 30psi warning light sender on the outlet of both pumps, and wired them to the fuel pump relay. If one or the other fuel pump dropped below 30psi, it cut power to the other pump instantly,. We tested it before running it, and while you would think that because the other pump is still working it would have full pressure, but remember it has to travel all the way up to the rail and all the way back again, the risidual pressure by the time it gets all the way back to the pump is much lower. We never needed it, but if you were running twin pumps and fuel lines, it is cheap, easy and simple, not to mention piece of mind.

Just remembered, there may be a better way to go about it, but as pressure is nothing when you turn the car on, the pumps didn't run, so we wired power from the start wire to the pumps, so when you crank the car it overrides the pressure sensors. Maybe there is a better way, maybe a timed delay or something, I'm not sure, but in terms of failsafes, the 30 psi pressure sensors were like $20 each or something.


6BOOST

[Winnipegman]

Everytime I try and hook up dual walbros, one seems to die right away. Like minutes after I start the car.

MTR Dual Fuel Pump Hangar
Dual Walbro GSS341 fuel pumps
Dual -6 feed / - 6 return line and all aermotive fittings
Aeromotive A1000 fuel pressure regulator with pressure gauge
MVP Motorsports - 8 dual feed / single return fuel rail
Siemens 950cc injectors

Constant 12v to pumps

Any thoughts?

[damianhindley]

dies like bad pump or power takes a crap?

[Morefaster]

most of the time you don't know when one dies...they each have a checkvalve, so it's not like you lose pressure....you lose volume under boost and that's when you find out you lost a pump. albeit the worst time

[Magic]

Originally Posted by Winnipegman

Everytime I try and hook up dual walbros, one seems to die right away. Like minutes after I start the car.

MTR Dual Fuel Pump Hangar
Dual Walbro GSS341 fuel pumps
Dual -6 feed / - 6 return line and all aermotive fittings
Aeromotive A1000 fuel pressure regulator with pressure gauge
MVP Motorsports - 8 dual feed / single return fuel rail
Siemens 950cc injectors

Constant 12v to pumps

Any thoughts?

That is strange. I would check the wiring first by going through and taking a close look at all of the components... Make sure the power wire size is sufficient. Make sure the fuse holder and fuses are up to par. Make sure you have excellent grounds... Make sure all connections are solid. Make sure there are no shorts in the system... Make sure you have good relays that are functioning properly... etc.

[Morefaster]

...and make sure there is something in between them so they aren't touching

[TaintedSC]

Can we bring this thread back on topic and actually get some info on alternatives to the walboro/denso setups. There are large single pumps ( external & internal ) out there that people are using for their cars. Anyone using these setups please share their experiences and pics of setups if possible.

[KBlake]

Apexi makes an in-tank pump, I believe the part number is BNR32. It's an upgrade for the Skyline, and supposedly flows enough fuel to support six 720CC/min injectors.

I am having a Bosch in-tank pump flow tested. The web site I bought it from claims it flows 300LPH. I will post results when I have them.

Ken

[AdamSupra]

Dual or even triple HKS/Denso pumps.... way better then the walboros

[Latteboost]

Check out the mechanical pump system by RREv

http://www.supraforums.com/forum/sho...d.php?t=464730

Bill

[sngledsupe]

Walbros are kind of a crappy way to go since they are not meant for the high pressure that a well boosted car requires. Look up the Bosch 044 fuel pump which works great with higher pressures, and is quite cheap.

with the fuel system using a 1:1 regulator, every pound of boost you add it will add a corresponding 1psi of fuel pressure. Therefore, with adding 30psi of boost your fuel system will require 75psi of fuel pressure. Sure, the fuel pump can do that, but this will also start to cause the flow to drop significantly. As well at higher pressures above 60psi of fuel pressure the walbro pumps have a relief valve that start to bleed off fuel. These pumps were just not made to handle these high boost pressures.

I would suggest a Bosch 044, works great in higher pressures, flows much more HP worth of fuel than the walbros, and cheaper price than a Weldon external