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Dual walbro setup


BoostedVR4
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Galant VR-4 org Post #: 394625 posted 10/16/06 11:13 PM     Remind Me!  Send Private Message   Edit Post      
Looking to do a dual walbro in-tank setup and i was wondering if I could use a -6an ss hose as my feed for the fuel rail?

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Hollowned
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Galant VR-4 org Post #: 394629 posted 10/16/06 11:25 PM     Remind Me!  Send Private Message   Edit Post      
Better question. Why couldn't you?

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Rausch Galant VR4.org Moderator
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Galant VR-4 org Post #: 394660 posted 10/17/06 12:53 AM     Remind Me!  Send Private Message   Edit Post      
with 2 pumps, i would say run 8an, and use the 6an as a return. are you planning on running the pumps straight to the rail?(with a filter) or are you plumbing to a swirl tank or something???



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cheekychimp Galant VR4.org Moderator
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Galant VR-4 org Post #: 394670 posted 10/17/06 03:12 AM     Remind Me!  Send Private Message   Edit Post      
I was told there wasn't enough room to run two walbros in tank although I believe the guys at extreme did find a way to do it. I think if I did it I would run a swirl tank and put the second pump in that.



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Mr_HYDE
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Galant VR-4 org Post #: 394675 posted 10/17/06 05:01 AM     Remind Me!  Send Private Message   Edit Post      
I remember Bimm designing a twin pump setup. Get with him

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Larry Parker
Rally Member


Galant VR-4 org Post #: 394682 posted 10/17/06 05:47 AM     Remind Me!  Send Private Message   Edit Post      
Lotsa rally cars run twin bosch pump setups... I need one!

LP



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jepherz Galant VR4.org Moderator
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Galant VR-4 org Post #: 394759 posted 10/17/06 09:05 AM     Remind Me!  Send Private Message   Edit Post      
I think Jonvr4 had an evo and 255 in his car.



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TurboTommy
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Galant VR-4 org Post #: 394773 posted 10/17/06 09:25 AM     Remind Me!  Send Private Message   Edit Post      
U don't want to run any pumps parallel as they will be working against each other. The best way is to run them in-line. Twin walboros one intank 255hp and other 255 inline should support 800whp without a problem. As it goes for the 6an return line its worthless since its the same size as the stock one.

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Josh Weaver
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Galant VR-4 org Post #: 394776 posted 10/17/06 09:28 AM     Remind Me!  Send Private Message   Edit Post      
Now I'm confused. Why wouldn't you want to run them in parrallel. I would think that running them in series would be worse than any pressure it would see from the parallel setup. I'm sure it may flow a little more than a single 255 but more than if they were plumbed parallel into a properly sized line?

-Josh

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digit
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Galant VR-4 org Post #: 394780 posted 10/17/06 09:38 AM     Remind Me!  Send Private Message   Edit Post      
Think about it if you ran two turbo's parallel or in line...

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blacksheep
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Galant VR-4 org Post #: 394891 posted 10/17/06 01:08 PM     Remind Me!  Send Private Message   Edit Post      
buschur just came up with a twin walbro system for the Evo - One is in the tank, the other is inline. Check Evom.net for details - search for buschur fuel system



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Mark
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Galant VR-4 org Post #: 394983 posted 10/17/06 05:40 PM     Remind Me!  Send Private Message   Edit Post      
Well not sure if ya guys know buschur sells a modified walbro thats good for 600awhp..

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digit
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Galant VR-4 org Post #: 394984 posted 10/17/06 05:43 PM     Remind Me!  Send Private Message   Edit Post      
Isn't it just a bosh pump and he labels it "modified walboro"?

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Mark
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Galant VR-4 org Post #: 394989 posted 10/17/06 05:53 PM     Remind Me!  Send Private Message   Edit Post      
Could be? It sure as heck looks like a walbro..

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TheJackalGT
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Galant VR-4 org Post #: 394992 posted 10/17/06 05:56 PM     Remind Me!  Send Private Message   Edit Post      
If you run them in parallel, aka "y'ed" into one line for our less mechanically inclined, the net gain of the second pump is something like 40LPH. The better way to do it, its to basically start with a hacked or completely new fuel pump assembly. Run 2 wallys in tank, two dash 6 lines to each side of the rail, and regulate them through the middle (between injector 2 and 3), and return.

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BoostedVR4
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Galant VR-4 org Post #: 395003 posted 10/17/06 06:23 PM     Remind Me!  Send Private Message   Edit Post      
I was talking to someone today and they told me that the proper way is to have two walbro pumps and have each come out of the tank with two -6an lines one one side of the rail and the other to the other side of the rail and then have it regualted in between 2&3 that way all injectors get the same pressure but my question is how do i get a regulator between two and four like the post above stated. would i have to drill weld a weld on bung in between 2&3 and go from there to the regulator? He also told me that another way is to have one line go from the pump to the normal feed point on the rail and the other to the regualtor inlet and then from the other regulator inlet to the rail. Does that make any sense, cause i am a bit confused. He says i could get away with that but once again its not the proper way its done. By the way i have a sx adj regulator and will be getting a aftermaket rail like a Florida/fuel injector clinic rail.


Edited by BoostedVR4 (10/17/06 06:27 PM)

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digit
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Galant VR-4 org Post #: 395005 posted 10/17/06 06:30 PM     Remind Me!  Send Private Message   Edit Post      
Quote:

Could be? It sure as heck looks like a walbro..




Are you going on the picture from their website? It doesn't actually say that this is a "modified" 255 to run more it just says... "This is made specially for Buschur Racing. This fuel pump is for the enthusiast that needs more fuel than a standard Walbro 255 can provide. This is a true drop in just like the standard Walbro. At 100psi of fuel pressure this pump flows 50% more fuel than the Walbro 255."

I have heard form a couple people that all it is is this bosch pump...

Bosch Motorsports Fuel Pump # 0 580 254 044 Price: $225.00 USD


This is the popular Bosch Motorsports "044" fuel pump, as used by Japanese European & Australian tuner shops, JGTC cars, Touring cars, almost all WRC cars, and many more. Quite possibly, the most popular aftermarket fuel pump. Capable of providing 300 LPH free flow and 200 LPH at 5 bar (or 72.5 psi) for up to 685 BHP. In comparison, the Walbro GSS341 255 "high pressure" fuel pump can support 390 BHP Note: Values calculated at 12V, 3 bar (43.5 psi) base fuel pressure, 2 bar (29 psi) boost pressure, 1:1 fuel pressure regulator ratio. These are inline fuel pumps, we recommend they be installed between the factory (or another aftermarket) in-tank fuel pump, and the fuel rail. These may be installed in the fuel tank, but some custom fabrication will usually be required. In addition, feeding these inline pumps with another pump (in series), will boost the output of the Bosch 044 fuel pump even higher.(as quoted from www.jayracing.com)

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TheJackalGT
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Galant VR-4 org Post #: 395009 posted 10/17/06 06:36 PM     Remind Me!  Send Private Message   Edit Post      
Quote:

I was talking to someone today and they told me that the proper way is to have two walbro pumps and have each come out of the tank with two -6an lines one one side of the rail and the other to the other side of the rail and then have it regualted in between 2&3 that way all injectors get the same pressure but my question is how do i get a regulator between two and four like the post above stated. would i have to drill weld a weld on bung in between 2&3 and go from there to the regulator? He also told me that another way is to have one line go from the pump to the normal feed point on the rail and the other to the regualtor inlet and then from the other regulator inlet to the rail. Does that make any sense, cause i am a bit confused. He says i could get away with that but once again its not the proper way its done. By the way i have a sx adj regulator and will be getting a aftermaket rail like a Florida/fuel injector clinic rail.




You dont nec. need to weld a bung on. If you have an aftermarket rail, or even a stock rail for that matter you can drill and tap it for an AN fitting and use rubber or steel braided from there.

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Larry Parker
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Galant VR-4 org Post #: 395011 posted 10/17/06 06:37 PM     Remind Me!  Send Private Message   Edit Post      
Thats the pump I run in my rally car...

LP



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TheJackalGT
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Galant VR-4 org Post #: 395012 posted 10/17/06 06:38 PM     Remind Me!  Send Private Message   Edit Post      
On our shop evo (546whp) We have a 255 HP that pumps up to a surge tank that sumps an engine compartment bosch 044, into a rail.

Supposedly one of the shops good friends has made over 900bhp on audis with the bosch pump in a formation similar.

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digit
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Galant VR-4 org Post #: 395026 posted 10/17/06 06:50 PM     Remind Me!  Send Private Message   Edit Post      
AMS sells a kit with a 255 in tank and one in line as their 1000hp fuel system...

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TurboTommy
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Galant VR-4 org Post #: 395285 posted 10/18/06 08:20 AM     Remind Me!  Send Private Message   Edit Post      
Bosch 044 Pump is 700whp pump without any questions.

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Gordian79
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Galant VR-4 org Post #: 395341 posted 10/18/06 10:10 AM     Remind Me!  Send Private Message   Edit Post      
i dont understand how having another pump inline would increase flow.If the inline pump gets fed by tank pump your fuel system will be as good as how fast the inline pump can move the fuel.unless the way it works is each pump has its own line and one line goes to the side of fuel rail and the other to the middle of fuel rail.



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curtis Galant VR4.org Moderator
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Galant VR-4 org Post #: 395421 posted 10/18/06 11:58 AM     Remind Me!  Send Private Message   Edit Post      
From the engineering stand point.

Don't run two pumps unless you run one pump to 2 injectors and the other to the other 2. Reason being pumps are like injectors they don't match perfect together. So if you have one that is stronger it will fight against the other and will kill it easily. Then what will happen is that one will die and lean out your engine. The only real way to do it is to have a dual system and run a dual hobbs switches so if one losses pressure the other will shut down. By the time you did all the work and payed the price for two separate systems you could have bought one large pump and sumped the tank.

My .02 cents for the day hope it makes since. I learned the hard way because I had the same thing except 2 155's in my mustang in 94. It lasted 3 monthes and died on the side of the road.



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TurboTommy
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Galant VR-4 org Post #: 395477 posted 10/18/06 01:43 PM     Remind Me!  Send Private Message   Edit Post   
One pump does not keep up with the fuel demand of large injectors (runs out of steam). The second inline pump helps to maintain the flow and the pressure up at high rpm/boost to keep the injectors wet.
Parallel pumps work against each other which only puts more stress on them causing premature failure.

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