Walbro Fuel Pump - Page 2 - Subaru WRX Forum
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post #16 of 38 Old 12-17-2009, 07:25 PM
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Quote:
Originally Posted by man show View Post
He also has a 1,000 (yep, one thousand) liter per hour fuel pump and that thing buzzes and makes all kinds of noise when the car is turned on. It's absolutely insane.
I bet he has a Aeromotive A1000, I use two of those and a mechanical pump ran off the cam shaft in our drag car. those pumps are very loud but I cant hear them once the engine is started. haha
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post #17 of 38 Old 12-17-2009, 07:51 PM
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Yeah, you're probably right. Sounds like you have a big nasty V8 in your car. His is a 4 cylinder (I want to say an Integra GS-R motor - I'm sure with upgraded internals) so it's actually sort of quiet when it's just idling so the fuel pump buzz/noise is definitely noticeable until he steps on the gas. I was under the impression that the Walbro 255 lph fuel pump was about as big as they come, but apparently I was wrong. Learn something new every day...

John
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post #18 of 38 Old 01-05-2010, 01:56 AM
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Quote:
Originally Posted by mfarnham View Post
I just need someone to confirm or deny my suspicions. I'm thinking about buying a Walbro 255 fuel pump, in preparation for future mods. Am I correct that installing a fuel pump won't require a tune, because the ECU controls the amount of fuel, not the fuel pump?

On that note, would it be difficult to install a fuel pump in my car? What is involved?

Thanks.
hey bro i did the walbor 255 fuel pump on my 06 wrx took 45 min tops no you dont need a tune but it is recomended todo so suggestion once you upgrade fuel pump upgrade injectors to a min of 750 cc cuase if a tuner tunes your car to atleast 19.5 psi it will max the stock 550 cc injestors that on the 06 wrx or if you have the sti 565cc ones will be the same hopes this helps robbie at epic motorsports in nc tuned my car 290hp awd/305tq awd

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post #19 of 38 Old 01-05-2010, 09:07 AM
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That information is absurd. You dont have to tune for the fuel pump, injectors YES. And there really is no minimum injector size to upgrade to if you are still running a stock turbo. You need to plan for future mods, and even consult your tuner, or look around the web. Jscspeed.com has a chart for turbo/injector sizing.

What you posted helped nothing, stop passing on and posting BS information.

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post #20 of 38 Old 01-05-2010, 11:12 AM
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Quote:
Originally Posted by newtothegame View Post
That information is absurd. You dont have to tune for the fuel pump, injectors YES. And there really is no minimum injector size to upgrade to if you are still running a stock turbo. You need to plan for future mods, and even consult your tuner, or look around the web. Jscspeed.com has a chart for turbo/injector sizing.

What you posted helped nothing, stop passing on and posting BS information.
hey bro i did the walbor 255 fuel pump on my 06 wrx took 45 min tops no you dont need a tune but it is recomended todo so suggestion once you upgrade fuel pump upgrade injectors to a min of 750 cc cuase if a tuner tunes your car to atleast 19.5 psi it will max the stock 550 cc injestors that on the 06 wrx or if you have the sti 565cc ones will be the same hopes this helps robbie at epic motorsports in nc tuned my car 290hp awd/305tq awd

so making sugestion from whats actualy being ran on vf43 turbo stock 550cc injectors is bs so be it but i have dyno sheet for proof
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post #21 of 38 Old 01-05-2010, 12:27 PM Thread Starter
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Quote:
Originally Posted by jrswrx69 View Post
if a tuner tunes your car to atleast 19.5 psi it will max the stock 550 cc injestors that on the 06 wrx
So, hypothetically, if I had my car tuned to 18 psi on the stock turbo, I can keep my stock injectors?

Mike
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post #22 of 38 Old 01-05-2010, 12:48 PM
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Hypothetically yes, if you're on the stock turbo. In reality maybe, maybe not. You may not be able to get them to 100%, but you'll probably come close, and you don't really want to run them past 80-85% duty cycle for longevity. My advice, you're talking about future plans, just do the injectors right and be in a safe duty cycle range. If your future plans include a larger turbo, then obviously you'll need injectors even if it's tuned to 18 psi or even less.

In case anybody reading this doesn't understand- Higher CFM (bigger turbo) at the same PSI still results in more air in the engine, thus the need for more fuel. I guess think of it as two ballons under the same pressure, but one is twice the size. Yes they're at the same PSI, but the larger balloon is going to hold more air.

-Chris
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post #23 of 38 Old 01-05-2010, 01:18 PM
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Technically if your tuner can get the duty cycles to +/- 90% on the 06-07 565 injectors WHICH THEY BOTH DO..... He will be able to tune the max boost down to lets say.... 17lbs and taper it off to 13... The powerband is a little more useable in day to day driving from my experience.

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post #24 of 38 Old 01-05-2010, 05:59 PM Thread Starter
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Alright. Sounds like I should just go for the upgraded injectors as well. Thanks everyone. What would be a good injector size? 850cc to be safe?

Mike
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post #25 of 38 Old 01-05-2010, 06:45 PM
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What turbo are you going to run? I run 850cc on my 20G with plenty of headroom. If I remember correctly 850s are good for around 500HP.

Check out this link for a chart of injector/turbo sizing:WRX Fuel injector sizing guide STi Fuel injector sizing guide Lgt fuel injector sizing guide, JSC Speed

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post #26 of 38 Old 01-05-2010, 09:34 PM Thread Starter
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My plans are to tune for 18 psi on my stock turbo, in the near future. And upgrade to a 20G turbo sometime after that.

Mike
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post #27 of 38 Old 01-05-2010, 11:54 PM
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I would go with some DW 850s then. They are great injectors and easy to tune with. And of course they will more than support your 20G.

Joshua
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post #28 of 38 Old 01-06-2010, 12:05 AM
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Walboro Fuel pumps are cheap and relatively crappy. However, a DECENT fuel pump may cost you 10x as much (they are not exactly plug and play). So join us in our wonderful world of crappy yet necessary fuel pumps!

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post #29 of 38 Old 01-06-2010, 08:32 AM Thread Starter
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Quote:
Originally Posted by mosc View Post
Walboro Fuel pumps are cheap and relatively crappy. However, a DECENT fuel pump may cost you 10x as much (they are not exactly plug and play). So join us in our wonderful world of crappy yet necessary fuel pumps!
Are the AVO pumps any better? I noticed they were more expensive.

Btw, thanks for the help Josh.

Mike
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post #30 of 38 Old 01-06-2010, 08:43 AM
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Mike no problem. Eveyone I knew that had a subie up in WA was running a warlboro. From simple stage 2 to a few guys running over 500HP. None of them (to include me) haave experienced any problems with them. My shop said one of the keys with it is to never lever the fuel tank get below the 1/4 mark, or the pump will burn up. They said thats the biggest problem, or at least that they have seen with them.

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