At what point does the 255hp become insufficient?

[tkelly27]

It's not just base + boost, it's base + boost + pressure drop over the lines and filter. If that's 5 or 10psi that will make a huge difference when you are running 38 base and 30psi of boost.

Try dropping your base fuel pressure if your injectors can handle it. That's my plan to keep my stock pump going for a while longer, giant injectors, low fuel pressure.

Good idea on the upgrade instead of replace. You can never have too much when it comes to adding fuel.

 

[DSMunknown]

I know me and Paul recently talked about this, but I still would like to see people use a Barry Grant FP. Cost is way up there, for sure. But have you ever seen one of those things in real life?! (Especially sitting next to a Wally, holy crap!) They really are the size of some car starters.

 

[JayRolla]

Well I gues the question is can a 255lph keep up with 1150's at max flow. I really want to know this also because Im about to upgrade turbos and my 1200's will be hitting 90% IDC. Think a single 255lph can keep up with these injectors?

Ohh and have you thought of the KB Boost a Pump. Guy on the link forums is running one with no issues. Puts about 17v constant to the pump and it will flow near 300lph. But you have to think that extra power is going to weaken that pump.

 

[sbiggi]

I'm on a single Walbro 255hp. Stock fuel lines, filter, rail and regulator.

Trapped 131.11mph at Bandimere into a 8mph headwind.
AFR was 12.0:1 on a mix on Sunoco 110 octane and 2 gallons of Q16

Should be 550-570whp on Revolutions Dyno

 

[1fastlaser]

Well from my understanding a walbro 255hp will supply 880cc injectors at full swing, but I think fp, wiring, feed, and return line will have effects on this. Race gas will always let you get away with alittle more also.

Regardless another pump wont hurt. I fabricated 2 walbro 255hps onto my stock hanger with an fittings. I running -6 feed return, and 1550cc injectors....there is so much room to go up its a joke. If you can control it, and you will eventually use it why not?!

 

[JayRolla]

Well from my understanding a walbro 255hp will supply 880cc injectors at full swing, but I think fp, wiring, feed, and return line will have effects on this. Race gas will always let you get away with alittle more also.

Regardless another pump wont hurt. I fabricated 2 walbro 255hps onto my stock hanger with an fittings. I running -6 feed return, and 1550cc injectors....there is so much room to go up its a joke. If you can control it, and you will eventually use it why not?!

Wow only 800's? Im really going to need an extra or larger pump. Im planning on maxing my 1200's.

 

[92awddsm]

Ohh and have you thought of the KB Boost a Pump. Guy on the link forums is running one with no issues. Puts about 17v constant to the pump and it will flow near 300lph. But you have to think that extra power is going to weaken that pump.

With my wally being 9yrs old, I would rather just replace it than spend the $ on the kb boost a pump. Going that route is like using a bandaid when you need stitches. I also fear that sending that amount of voltage to the pump will tend to overheat it, possibly boiling the fuel, and causing vapor lock. Not to mention, decreasing the usable life of the pump.

And for intank, the denso supra tt pump is 280lph, and the 044 inline is 300lph. And thats without a boost a pump.

 

[TSIMonsteR]

I vote dual wallys, but either way, after 9 years, it definitely sounds like your pump just can't keep up anymore.

 

[kawboy]

Get a new 255hp intank and get a wally inline.

Cheap and effective.

 

[bastard dsm]

i have mad 600hp on a single wally and on e85 to boot.....they can go a long way.

 

[JayRolla]

Now this is just insane. English Racing just posted a dyno few days ago and at 638whp they where out of fuel with dual walbros. You always through out these crazy numbers like making 1000whp on 450cc injectors, J/K.

 

[gixrman]

I also fear that sending that amount of voltage to the pump will tend to overheat it, possibly boiling the fuel, and causing vapor lock. Not to mention, decreasing the usable life of the pump.

Thats when you need one of these
Aeromotive Inc. - High-Performance Fuel Systems & Fuel Pumps

 

[turbo addict]

With my wally being 9yrs old, I would rather just replace it than spend the $ on the kb boost a pump. Going that route is like using a bandaid when you need stitches. I also fear that sending that amount of voltage to the pump will tend to overheat it, possibly boiling the fuel, and causing vapor lock. Not to mention, decreasing the usable life of the pump.

And for intank, the denso supra tt pump is 280lph, and the 044 inline is 300lph. And thats without a boost a pump.

You could through a surge tank in between the 2 new pumps for a little added safety.

 

[bastard dsm]

Now this is just insane. English Racing just posted a dyno few days ago and at 638whp they where out of fuel with dual walbros. You always through out these crazy numbers like making 1000whp on 450cc injectors, J/K.

i just know what im doing......meenglishracing . well i have vids to back it up too.
i dont know how i do it but it gets done. on our shop galant the link logs show 680hp at 25-27psi but yea im out of pump......shows 3400hz as well. man this thing moves....check out this vid......from a 60roll with me in 4th at 20psi. i hit the breaks at 120mph. it tords the middle of the vid.

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[Aaron91RS]

Originally Posted by JayRolla

Ohh and have you thought of the KB Boost a Pump. Guy on the link forums is running one with no issues. Puts about 17v constant to the pump and it will flow near 300lph. But you have to think that extra power is going to weaken that pump.

back on page 1 I was going to say this,
then i read it and was going to say this is the smartest thing said in this thread and why people insist on riggin up a much more complicated inline or dual tank setup over this I don't know.

With my wally being 9yrs old, I would rather just replace it than spend the $ on the kb boost a pump. Going that route is like using a bandaid when you need stitches. I also fear that sending that amount of voltage to the pump will tend to overheat it, possibly boiling the fuel, and causing vapor lock. Not to mention, decreasing the usable life of the pump.

And for intank, the denso supra tt pump is 280lph, and the 044 inline is 300lph. And thats without a boost a pump.

but then I read this and you don't like it, so I'm just going to keep my mouth shut on how it's working just fine for me at 28psi where it requires 30% more fuel being as I use e85.
I guess I'm doing it wrong.

 

[Black_Bullet]

Does anyones 255Lph scream like mines. Mines is like 5yrs old and Ive always assumed it was dieing.
Old vid, but you can hear my pump when I walk around towards the back of the car. Ive always thought it was abnormally loud. I notice it will get a little quieter the more gas thats in the car, or if I hit a corner throwing the fuel around quiets it, but its still weird. Hope it can manage supplying for 450awhp on 93oct because thats as far as I need to go.

YouTube - AWD laser - Idle after BC272 install

 

[JayRolla]

I kind of think walbros are hit and miss on how load they are. My brothers pump sounds just like that. Mine also sounded like that for about 2 months and then got quiet for some reason. Now it just has a slight hum, usually only noticable when very low on fuel. I dont even care where the fuel gauge is, once I hear the pump I know its getting real low.

 

[Calan]

The volume of mine is directly proportional to how much carpet and crap is covering it. With bare metal showing, gang-bangers tell me to turn it down at stoplights so they can hear their sound systems.

 

[1fastlaser]

Check the filter on the end of the pump. I had mine get loud because the filter was about that old, and clogged up. It started to lean out real bad in boost. Changed the strainer, and the pump became silent.

Wouldnt hurt to check/change the second fuel filter also.

 

[Black_Bullet]

Yea that was something I planned to do shortly after I got it running again, Ive never experienced any leaning out, but i dont have the type of fueling requirements as some of you, thanks anyways. ^

 

[->PrOjEcTGS<-]

Did you install the rubber sleeve on the pump when you installed it? That rubber sleeve is meant to quiet the pump down.

Just watched the video and was waiting for you to turn the blinker on when you were revving the engine an sitting in the car.
EEEEEEEeeeeeeeeEEEEEEEeeeeeeeeEEEEEEEEEeeeeeeeee.....

 

[JayRolla]

The volume of mine is directly proportional to how much carpet and crap is covering it. With bare metal showing, gang-bangers tell me to turn it down at stoplights so they can hear their sound systems.

, thats actually probably my issue. My trunk is full and has been since a little after the pump. I bet that is why mine is quiet right now, and I thought I had a quiet pump.

 

[gixrman]

Does anybody make a pickup only? So if you wanted just to run a external pump with just the pickup in the tank.

 

[the_mork]

Has anyone tried punching the pressure relief valve in? This will help your Wally flow quite a bit more at higher pressure and according to the Evo and Subbie guys they are reliable this way. Buschur sold pumps with this mod done for quite a while for $200+.

 

[johnboy1065]

Right around 520 WHP is where I started running out of fuel pump on one walbro 255LPH. this was on an EVO though...