Fuel Pump / Horsepower Questions

[RocsMerc]

Basically I'm trying to decide between the Walbro GSS342 and the GT-40 fuel pump, but first let me give some details about my setup.

I'm going to be self installing a Trilogy supercharger in a few weeks. I'll be using 39lb injectors and a 3.4" pulley (stock pulley size). My car has exhaust work done to it (hi-flow cats, x-pipe, mufflers, larger diamater pipe.) but has the stock manifolds. The last time I was on a dyno, it came in at 272 hp at the rear wheel. The IAT sensor was relocated inside the Cobra intake manifold. I had a shop drill and tap it yesterday. I have a Lightning 90mm MAF that I'm going to use just because I have it laying around. I also managed to get an Accufab oval bore throttle body in a trade. That throttle body might be a bit overkill, but hey, it's shiny.

Now onto the fuel pump. I want to run a setup that won't need a BAP to make the install less complicated and to save some money. I know the Walbro is 255 LPH and the GT fuel pump is well over 300 LPH. The GT fuel pump costs $206, and from what I understand, requires some modifications to install. On the other hand, the Walbro fuel pump can be purchased with an install kit for the Marauder for $99. http://www.jdsperformance.com/index.asp?initemuid=436&fcmd=item&inmake=0 I noticed some people say that the GT fuel pump runs noticeably quieter than the Walbro. I've also heard that it's bad to run the Walbro on a returnless fuel system. Are either of these statements true?

So which should I buy? I know the answer is going to be based on my power goals for my car, but I'm not sure how much power I should be expecting to make. How much power should I expect with this setup, and based on that, which pump? Also, I was wondering if I can install the fuel pump and drive the car while I'm still N/A without a re-tune. I want to try and do as much ahead of time as I can to try and make the actual supercharger install go smother.

[martyo]

Consider going with a Focus pump and a BAP.

[MOTOWN]

Im going to be running twin walbro 400lph pumps soon on a return/regulated fuel setup

The only possible problem i can see with the walbro is you may need to regulate it, your fuel pressure sensor may have an attitude if you dont, but i like walbro pumps!

[Black&Gifted]

Consider going with a Focus pump and a BAP.

I still need to purchase my fuel pump and was considering the GT super car pump as well (not really a fan of the walboro pumps in a returnless system for the reasons stated by Motown Marauder). I will be running a BAP.

Are you recommending the SVT Focus fuel pump or just an ordinary Focus fuel pump (I would assume the SVT Focus pump but you know what they say when you assume!)? Also, why the Focus pump over the GT super car pump?

My initial stage will be the eaton swap and keeping the boost around 12 pounds.

Any insight is appreciated. Thanks!

[Mike M]

I have been using a Walbro 255 for several years and it is very quiet...scary quiet. I just bought a Walbro 400 for about $150 but I won't put it in or the #60 injectors until tuned.

[RocsMerc]

Consider going with a Focus pump and a BAP.

Can you explain why? I feel like I'm missing some important piece on information when people recommend that to me. Your not the first person to tell that to me. Why should I spend 250 on just the BAP, not even the cost of the pump, when the GT pump can get it done on it's own for less? Are you saying the Walbro won't provide enough juice without a BAP? Is the GT pump too much work to install?

[Michael]

Hello,

Look up deatswerks fuel pumps, the dw300 flows 320 liters and is ethanol safe.

Also stryker fuel pumps, the stryker 340 flows 340 liters and is ethanol safe.

Also aeromotive 340 fuel pump, not ethanol safe.

The can all be used with pulse width modulation or a return system and will handle your power goals without a boost a pump and drop in pretty easy. :burnout:

[LANDY]

I still need to purchase my fuel pump and was considering the GT super car pump as well (not really a fan of the walboro pumps in a returnless system for the reasons stated by Motown Marauder). I will be running a BAP.

Are you recommending the SVT Focus fuel pump or just an ordinary Focus fuel pump (I would assume the SVT Focus pump but you know what they say when you assume!)? Also, why the Focus pump over the GT super car walbro makes the Ford GT pump, the focus pump will draw more current and give you less output.
Also the ford GT pump is drops in easy and if you add a BAP you can get into the lower 500rwhp with it.

[hotford]

I'm running a GT supercar pump with a BAP and 60 lbs injectors and it showed no signs of maxing out
I made 535wrhp.

[Marauderjack]

I got a Walbro 255 lph pump when I installed my ProCharger back in 2005 and it is still going strong after 156K miles......waaaaay longer than I thought it would!!:bows:

[Seneca]

twin gt pumps and zone5 fpdm is what i'm using. The gt pumps are very quiet!

[SC Cheesehead]

I'm running a GT supercar pump with a BAP and 60 lbs injectors and it showed no signs of maxing out
I made 535wrhp.


GT fuel pump and BAP on my car, no issues to date; putting out around 430 rwhp.

[RocsMerc]

I got a Walbro 255 lph pump when I installed my ProCharger back in 2005 and it is still going strong after 156K miles......waaaaay longer than I thought it would!!:bows:

Are you using a BAP? How much HP is the Walbro good for without one?

[boatmangc]

Aeromotive 380 and a BAP on mine.

[dmjarosz]

What does it take to not have to use a BAP? Im shooting for the 420-440 rwhp range that a lot of people seem to go for. I dont want to get close to 450 and start risking breaking internals.

[MOTOWN]

What does it take to not have to use a BAP? Im shooting for the 420-440 rwhp range that a lot of people seem to go for. I dont want to get close to 450 and start risking breaking internals.

Get your self a good pump like a walbro, or aeromotive pump, that delivers enuff fuel without the need to boost its voltage past what its intended to operate at, never have liked the bap.

[RocsMerc]

What does it take to not have to use a BAP? Im shooting for the 420-440 rwhp range that a lot of people seem to go for. I dont want to get close to 450 and start risking breaking internals.


Get your self a good pump like a walbro, or aeromotive pump, that delivers enuff fuel without the need to boost its voltage past what its intended to operate at, never have liked the bap.

Thank you so much, this was the info I was looking for. So the Walbro can handle 420 to 440 rwhp. That's what I wanted to know.

[Odinson]

Anybody actually set up the Walbro 400 w/ no BAP yet? Special provisions?

May just keep my stock setup for a while, but if I ever kill the stocker engine I'll probably upgrade with unspeakable numbers in mind.

[DOOM]

walbro makes the Ford GT pump, the focus pump will draw more current and give you less output.
Also the ford GT pump is drops in easy and if you add a BAP you can get into the lower 500rwhp with it.

This!!! ^^^^

The Ford GT pump is a walbro pump! :lol:

I have ran a Ford GT pump with 60# injectors making 500RWHP!!!

Never had an issue with the pump!

And now I'm running twin ford GT pumps! (getting ready to make more power)! :D

[dmjarosz]

This!!! ^^^^

The Ford GT pump is a walbro pump! :lol:

I have ran a Ford GT pump with 60# injectors making 500RWHP!!!

Never had an issue with the pump!

And now I'm running twin ford GT pumps! (getting ready to make more power)! :D

So the Ford GT fuel pump alone will be fine for 420-440 rwhp? What about upgrading the FPDM?

Now for the more complicated question.. Im running the stock Cobra injectors.. I think they're 39#. Does that have any affect as to whether I need a BAP or not?

I hate to spend the money on a BAP only to find I dont need it for my HP levels.

[CWright]

Running Twin Supercar pumps with no BAP. Jeff at Mo's said I am good to go!

[scruff]

[QUOTE=dmjarosz;1192344]So the Ford GT fuel pump alone will be fine for 420-440 rwhp? What about upgrading the FPDM?

Now for the more complicated question.. Im running the stock Cobra injectors.. I think they're 39#. Does that have any affect as to whether I need a BAP or not?

I hate to spend the money on a BAP only to find I dont need it for my HP levels.[/QUOTE ]

i,m useing the GT pump with a BAP on a 2V here with #39lb Cobra injectors and i,m makeing 409 RWHP so i would think your goal is easily reached

[Vortech347]

Aeromotive Stealth 340.

I'm running that on my fox as a single pump feeding the HP in the sig. No issues.

[SC Cheesehead]

So the Ford GT fuel pump alone will be fine for 420-440 rwhp? What about upgrading the FPDM?

Now for the more complicated question.. Im running the stock Cobra injectors.. I think they're 39#. Does that have any affect as to whether I need a BAP or not?

I hate to spend the money on a BAP only to find I dont need it for my HP levels.

I'm running a single GT pump with a 20A BAP, 39# injectors, and run a constant 40+ psi of fuel pressure at anything much over idle. Currently at 430 rwhp, and no issues to date.

The BAP provides additional voltage to feed your fuel pump, and it also serves as a voltage regulator to maintain consistent voltage to your fuel pump. The higher voltage generated by the BAP will lower the fuel pump's duty cycle while pushing the same amount of fuel, meaning that at higher voltage, the pump puts out more fuel, and will keep fuel pressure consistent.

You do NOT want to run a SC engine lean at WOT.

Lean = BANG! = :bigcry:

You've got couple routes to go, FWIW, I like the BAP option, but whichever you chose, IMO a fuel pressure gauge is a good idea.

[Local Boy]

^^^^Very True^^^!!!

Personally running the Gt pump with a BAP...The stock MM (electrical) wiring for the pump is not able to continuously supply the necessary power to take advantage of the pumps abilities...Hence, the use of a BAP...

Without the BAP...it would run out of fuel (lean) @ 5,500 RPM's...

With the BAP....bingo...No fuel drop off...

Aloha

[Mike M]

Hello,

Look up deatswerks fuel pumps, the dw300 flows 320 liters and is ethanol safe.

Also stryker fuel pumps, the stryker 340 flows 340 liters and is ethanol safe.

Also aeromotive 340 fuel pump, not ethanol safe.

The can all be used with pulse width modulation or a return system and will handle your power goals without a boost a pump and drop in pretty easy. :burnout:


The Stryker pump is looking better and better.

It works in a return less system and it's E85 ok

[1 Bad Merc]

I have the GT-40 pump and the bap (not turned up all the way) and I am making 466 hp. I also have the 39 lb injectors and the stock MAF!

Dont buy parts you dont need. Do the basics and then dyno tune it and see what your engine wants/needs.

At the hp level you are talking about (400-420) you dont need the bigger injectors or lightning maf. These engines dont like to run lean and you can easily kill one if that happens.

[sailsmen]

Ford GT40 is tried and true. Some report having to rekey to start althouhg in over 60K miles on them I have never had to.

[Mike M]

Ford GT40 is tried and true. Some report having to rekey to start althouhg in over 60K miles on them I have never had to.

What is the specs on this pump and is it E85?

I'm leaning towards the Stryker.

[LANDY]

I have the GT-40 pump and the bap (not turned up all the way) and I am making 466 hp. I also have the 39 lb injectors and the stock MAF!

Dont buy parts you dont need. Do the basics and then dyno tune it and see what your engine wants/needs.

At the hp level you are talking about (400-420) you dont need the bigger injectors or lightning maf. These engines dont like to run lean and you can easily kill one if that happens.
You mean the 90mm maf that came with the trilogy kit right?

[1 Bad Merc]

yes-you dont have to go and buy another one. I have personally heard different tuners telling people to buy special maf's and then sticking them for another $300-$500 when they dont need it. Not for the stock trilogy kit. If you need more info let me know and I will hook you up with Chuck -Tallboy and he can explain it to you in more detail.

[sailsmen]

If you have any mods you should get a custom dyno tune. Any car with any S/C should have a dyno check regardless of who provided the canned tune. The cost compared to the S/C is nominal. Also an oil and trans fluid analysis can be very valuable.

[justbob]

You mean the 90mm maf that came with the trilogy kit right?

Unless that's a newer item supplied, Trilogy uses the stock 80 mm.

Brad, you still have an unmodified K&N, which will only accept an 80 mm.


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[1 Bad Merc]

Sorry -I meant 80MM -Thanks Jbob!

I got something for you from MVX-ill give it to you next time I see you:)

And NO it's not the ************!

[LANDY]

Thats news to me. On centrifugal setup i have pegged the 90mm at around 450rwhp.
It seems to me that the 80mm would peg at your power levels. Do you at least have a mafia? Good its working for you.

[1 Bad Merc]

Thats news to me. On centrifugal setup i have pegged the 90mm at around 450rwhp.
It seems to me that the 80mm would peg at your power levels. Do you at least have a mafia? Good its working for you.

Nope -no mafia and I dynotuned it at Lidio's and had no problems at my power level. Also, I gained close to 25 hp with my cut-outs opened which I am told is really not possible also :coolman:

[Mike M]

Nope -no mafia and I dynotuned it at Lidio's and had no problems at my power level. Also, I gained close to 25 hp with my cut-outs opened which I am told is really not possible also :coolman:

What cut outs?