LPE Fuel pump good for 500RWHP FI?

[Cruiser787904]

Alright due to the fact I can't get my hands on a canned tune for my TVS 1900 my build is already going to the next level. I am going to be adding headers and a smaller snout pulley (3.0 from 3.2) then a dyno tune. I am hoping this will take me to the 500 rwhp range but I am not stuck on that I am just using that as a gauge.

Will my LPE fuel pump be enough or should I add a boost a pump as well? I am thinking it is safe insurance but wanted to make sure I wouldn't be running my fueling on the edge with the BAP.

Any help would be great thanks.... I will be drilling out the bucket well I am in there as well.

[kjhallex]

I will be installing a d1 procharger and a epp cam soon and I have been researching alot trying to find out what kind of fueling im going to need. I talked to williams perfromance and they said I would be just fine with the LPE fuel pump. I should be around 500 to 580rwhp.

[Cruiser787904]

That is what I have been hearing as well but I like to be safe so I may just through a kenne bell bap on it and run better wiring for insurance....

Are you running 1 7/8 or 1 3/4 headers? I am debating right now and I know the 1 3/4 will be fine for 500 rwhp+ but 1 7/8 gives me room to grow and crank the boost

[Turbo Pig]

I am using an LPE pump and 60# and I just made 560 rwhp

[kjhallex]

That is what I have been hearing as well but I like to be safe so I may just through a kenne bell bap on it and run better wiring for insurance....

Are you running 1 7/8 or 1 3/4 headers? I am debating right now and I know the 1 3/4 will be fine for 500 rwhp+ but 1 7/8 gives me room to grow and crank the boost

I have 1 3/4 kooks I think they will be fine till around 600rwhp.

I am using an LPE pump and 60# and I just made 560 rwhp

Thats what I want to here!

[Cruiser787904]

Alright I think I will be safe then....Turbo Pig do you have a BAP as well or just pump? Thanks guys.....

[Turbo Pig]

No BAP

[JumboCandy]

I will be drilling out the bucket well I am in there as well.


Is this something i should have done when installing my LPE fuel pump?

[RSV]

Hey guys.

I think I'm going to change out my Bosch 044 for the LPE unit, it's just too damn loud. Where is the best place to find a fuel bucket. We tore the stocker up when we put in the 044.

[GTO1_OHIO]

Is this something i should have done when installing my LPE fuel pump?


LPE will tell you no as will most performance shops. Didn't drill mine and have over 100 track runs with it.

[Cruiser787904]

Hey guys.

I think I'm going to change out my Bosch 044 for the LPE unit, it's just too damn loud. Where is the best place to find a fuel bucket. We tore the stocker up when we put in the 044.

I can't remember the P/N but if you do a search for the fuel bucket mod it will come up with the stock fuel bucket p/n and the 8.1L truck bucket P/N that is a bigger unit that is considered an upgrade...Good luck...

I dont think I will drill my bucket unless I have issues. I will drop it in and see what it does from there.

[2005YellowGTO]

You will be fine at your HP goal, to stay with just a Walbro 255 a.k.a. LPE pump. Boosting the LPE will be over kill for your goals.

[EDISKRAD EHT]

I have the LPE Pump with no BAP and I've done some LOOONG pulls racing a sport bike (from 2nd to top of 5th) and my fuel pressure was ok. My dyno was just over 500RWHP.

[GTO 05]

I have the LPE Pump with no BAP and I've done some LOOONG pulls racing a sport bike (from 2nd to top of 5th) and my fuel pressure was ok. My dyno was just over 500RWHP.

How did you find the noise level of the GSS340 compared to the stock pump.....any difference at all ?

[EDISKRAD EHT]

I don't hear the pump ever.

[GTO 05]

I don't hear the pump ever.

That's what I thought. When mine was stock, I could barely hear it on the intial prime before starting, then it was totally drowned out by the noise of the engine. I now have the APS twin pump setup which I can hear while idling at the stop light. I've been thinking about going back to the stock bucket with the LPE mod and a BAP seeing that I'm planning on staying in the 500-600rwhp range.

[JumboCandy]

What is good fuel pressure? Ever since i installed my LPE fuel pump i have 62.5 psi of fuel pressure. When i am WOT it drops to 55 psi and stays there. So i added a BAP and the samething. Is this bad?

[EDISKRAD EHT]

From what I've researched the 55psi at WOT is pretty well normal. Mine drops like that as well.

[kjhallex]

What is good fuel pressure? Ever since i installed my LPE fuel pump i have 62.5 psi of fuel pressure. When i am WOT it drops to 55 psi and stays there. So i added a BAP and the samething. Is this bad?

You should be fine, just watch your afr also and make sure it doesn't start to go lean.

[brazenorange06']

What is good fuel pressure? Ever since i installed my LPE fuel pump i have 62.5 psi of fuel pressure. When i am WOT it drops to 55 psi and stays there. So i added a BAP and the samething. Is this bad?

if it is running the same pressure wot with the BAP, then yes there is definetly a problem. It should be pumping some pretty serious numbers with a boost-a-pump.

[JumboCandy]

if it is running the same pressure wot with the BAP, then yes there is definetly a problem. It should be pumping some pretty serious numbers with a boost-a-pump.


Well i only see it at the top of first gear. Going from 3 psi (is when the switch turns on the BAP) to second gears happens so fast i don't see anything on the fuel pressure gauge. I only get in it for 3 or 4 seconds at a time only i get dyno tuned this friday. So we'll see what happens.

[mistermike]

if it is running the same pressure wot with the BAP, then yes there is definetly a problem. It should be pumping some pretty serious numbers with a boost-a-pump.

No there isn't. The pressure regulator is in the back of the car, 15 very long feet of fuel line away from where you want steady fuel pressure. Increasing the speed of a fuel pump increases volume, not pressure. It cannot compensate for plumbing losses after the regulator. The only time you will see increased volume cause an increase of pressure, is if you had insufficient volume flow before the regulator.

[brazenorange06']

No there isn't. The pressure regulator is in the back of the car, 15 very long feet of fuel line away from where you want steady fuel pressure. Increasing the speed of a fuel pump increases volume, not pressure. It cannot compensate for plumbing losses after the regulator. The only time you will see increased volume cause an increase of pressure, is if you had insufficient volume flow before the regulator.

gotcha, ya your right. My mistake.

[EDISKRAD EHT]

No there isn't. The pressure regulator is in the back of the car, 15 very long feet of fuel line away from where you want steady fuel pressure. Increasing the speed of a fuel pump increases volume, not pressure. It cannot compensate for plumbing losses after the regulator. The only time you will see increased volume cause an increase of pressure, is if you had insufficient volume flow before the regulator.

You're a pretty intelligent guy I've noticed. One thing I can't find a definitive answer on, is what would be the lowest fuel pressure one would deem acceptable before they should upgrade their fuel system?

[jmd]

Hey guys.

I think I'm going to change out my Bosch 044 for the LPE unit, it's just too damn loud. Where is the best place to find a fuel bucket. We tore the stocker up when we put in the 044.

have you had any fuel problems with the o44 heating up the fuel and dropping pressure? this is happening to me.

[kjhallex]

have you had any fuel problems with the o44 heating up the fuel and dropping pressure? this is happening to me.

JMD did you get your goat back on the road?

[JohnF]

You're a pretty intelligent guy I've noticed. One thing I can't find a definitive answer on, is what would be the lowest fuel pressure one would deem acceptable before they should upgrade their fuel system?

I'd like to know this too. Anyone? Anyone?

[mistermike]

It's not so much the lowest pressure, per se, but rather how hard the injectors are working at a given pressure. Modest droops in fuel pressure can be "tuned out" to a degree. Any time the injector duty cycle is meaningfully above 80%, you're running out of injector or fuel. That having been said, a 10% drop in fuel pressure under peak demand would indicate a need for improvement.

[JohnF]

It's not so much the lowest pressure, per se, but rather how hard the injectors are working at a given pressure. Modest droops in fuel pressure can be "tuned out" to a degree. Any time the injector duty cycle is meaningfully above 80%, you're running out of injector or fuel. That having been said, a 10% drop in fuel pressure under peak demand would indicate a need for improvement.

A+++ post, would read again LOL

[ericwilloughby]

Is this something i should have done when installing my LPE fuel pump?

I would never drill the bucket. I don't know what got that bs started but don't do it. Nothing but trouble. People who drill it talk about it being necessary to maintain at least 1/4 tank of fuel. If you do that then there are holes in the top of the bucket that allow extra fuel in anyway. I have pictures on hear somewhere. I'll look. Don't do it.

Hear it is. http://www.ls1gto.com/forums/showthread.php?t=2956 97&highlight=bucket post 29

[ericwilloughby]

if it is running the same pressure wot with the BAP, then yes there is definetly a problem. It should be pumping some pretty serious numbers with a boost-a-pump.

I think this is a little harsh. Running the same psi after a BAP install confirms that the loss in pressure is just a line loss due to the regulator being in the tank. A BAP shouldn't be expected to increase pressure, only flow. Additional flow will only cause a rise in pressure up to the point the regulator is set at. A 5 psi loss is normal.

[ericwilloughby]

That having been said, a 10% drop in fuel pressure under peak demand would indicate a need for improvement.

Your skating a very thin line with this comment. You have agreed that a 5 psi drop is to be expected with the regulator in the tank. A 10% drop off 60 psi is 6.

I wish there was an easy way to put a regulator up front where the damn thing belongs. What were they thinking?

Anyone ever try to use the purge line as a return?