Alan MaC

Was talking to the guy who serviced my Scoob today and reckoned with an uprated fuel pump, it would benefit the turbo.

I have a VF28 Turbo, which fuel pump would you go for and, what difference would I notice?

Thanbks all.

Regards

Alan MaC

Mikkel

I've just had a walbro uprated fuel pump installed today. Only had mine fitted for when remap the car.

mgcvk

Yes the walbro. You won't necessarily notice a difference but will certainly need it for safety if you are looking to get the benefit from the bigger turbo. Could do with some Sti pinkie injectors too to get the benefit of the turbo and of course appropriate mapping.

Alan MaC

So it's the Walbro is the one then?

What does it actually do?

And what improvements does it deliver?


The reason I ask is as I said, the the guy who did my servicing today said it would help the Turbo I have.


Thanks.

Regards

Alan MaC

pslewis

Now, lets get this straight ...................

We are talking about an 'uprated' fuel pump here, are we? - you know, the thing that pumps the fuel to the injectors and maintains pressure.

The Injectors open for a period set by the ECU, given all the Inputs it receives, therefore ....... by simple logic - an uprated pump CANNOT make one bit of difference!!

Another ScoobyNet myth Glad I caught it before too many gullibles wasted good money on bad advice!!

And as for 'helping the turbo' ..... helping the Turbo do what, exactly??? PMSL

MikeyTang

iTrader: (4)

Can anyone enlighten us?

Mikkel

So Prodrive just put it in with the PPP for effect?

340BHP-WRX

iTrader: (6)

Instead of getting rid of the 'search' button and asking people to pay a fiver to be able to use it,webmaster should ask how many people will pay a fiver to get rid of this idiot PERMANENTLY !

fbladerrv900

pslewis

I'm being ABSOLUTELY serious!!

What does an uprated Fuel Pump improve?? And How does it do it??

340BHP-WRX .... Instead of asking for my head - just answer the simple question!!

Fact 1 - the Injectors open for a set period, this period is set by the ECU, what possible difference could the Fuel Pump make to this??

I am GENUINELY interested if there is a reason - I just cannot understand it at this point in time and I am an Engineer.

340BHP-WRX

iTrader: (6)

Why not ask the question then before jumping in on the thread and branding it as a 'myth' ?

I cannot tell you exactly how it works other than it supplies more fuel per hour which you need if you have larger injectors etc.

The standard fuel pump will not flow enough fuel per hour for a modified car basically.

maydew

iTrader: (9)

hi mate i have spoken to zen today about just having a remap and decat done on an 03 sti and told me i would need an uprated fuel pump,wheres my mate has got an 03 wrx with the same mods and a remap at powerstation and they told him he didnt need to so i thinks its just down to the mapper just my thoughts anyway

pslewis

The PPP includes:-

Recalibrated engine management system
High flow intercooler hose
Stainless steel sports exhaust silencer

NOT, as far as I can see, a Fuel Pump ...................... so, your point being??

pslewis

Starts to make 'some' sense - fitting larger bore injectors is quite a major modification. The difference in bore size cannot be big, what are we talking? 5% Max?

It asks a lot to believe that the original pump cannot supply fuel to satisfy such a minor increase in bore diameter .... in fact, I don't believe that a standard pump cannot manage the flow required.

What are the sizes of the bore on a Standard Injector verses the Injectors you are talking about?

340BHP-WRX

iTrader: (6)

I couldn't tell you what the difference in bore size is !

I can promise you that a standard pump won't supply enough fuel that will be required when running around 350-400bhp.

I'm sure someone on here can explain all the specific details better than I can !

maydew

iTrader: (9)

is it more about regulating the fuel more than about how much it can flow and guessin a bigger pump can produce better pressure plus i imagine an uprated pump is cheaper than a regulator

pslewis

Thanks for trying ....

Can you understand my dilema? The Standard Fuel Pump is capable of supplying more than it actually needs to, thats just how it is - Designers have a factor of safety to work with.

I simply cannot imagine any road car requiring so much fuel that the supplied pump cannot manage.

You have an uprated pump because you were told you needed one, you don't actually understand why you bought one - which leaves you open to getting the contents of your wallet lifted

pslewis

The Uprated Fuel Pumps are sold to be used with the standard Regulator on all our cars.

maydew

iTrader: (9)

cool mate just ordered mine anyway scooby world doin a deal on them at the moment if your interested in one lol lol lol

pslewis

Walbro statement:-

"Walbro uprated fuel pump

If you are upping your boost or modifying your engine, the chances are you are putting more strain on your already fairly old and tired fuel pump.

If the old pump is not up to the job of delivering enough fuel, you risk running lean and that's when detonation can occur.....

These pumps are a great cost effective replacement for the standard units and are well up to the job of delivering the increased flow of fuel needed for a highly tuned engine

No need for remapping after fitting as the fuel pressure regulator will make sure the flow is correct for your car.

Fuel pumps won't give any performance increase on their own, but they mean that your fuel system is upgraded to cope with increased boost, larger injectors and any other mods you might have in mind"

-------------------------------------------------------------------------------

Note:- the chances are you are putting more strain on your already fairly old and tired fuel pump ............. Chances? fairly old? Tired?

Note:- If the old pump is not up to the job of delivering enough fuel .... IF?

Nah, it's all marketing hype .......... sorry to pop your bubbles!

pslewis

Do I look stupid??

Ha Ha - marketing hype NEVER gets me .... I work with hard evidence and there isn't one bit to support the use of uprated fuel pumps.

But I hope you have a happy life together

maydew

iTrader: (9)

proper mate laughing my **** off

pslewis

maydew

iTrader: (9)

Do I look stupid?? must i really answer that one lol lol

340BHP-WRX

iTrader: (6)

You don't listen to what anybody says so why bother asking questions

Mikkel

My point being you don't know what you are talking about. Read what you get in the PPP - http://195.212.11.58/imggb/www/subaru_accessories.nsf/NULL/9A189478360FA98C8025728F004DF270/$FILE/SACC2632%202007%20STi%20PPP.pdf

340BHP-WRX

iTrader: (6)

We all know he doesn't know what he's talking about-he's just doing it to wind people up !

hux309

I have to agree with pslewis to a point, manufacturers do have to make the fuel pumps with a margin for extra flow just incase it is needed, how much i do not know

Im surprised someone hasn't posted up the flow rate of a standard fuel pump at say 3bar that way you could easily calculate if it's up to the job

angry1

Have to agree with Lewis hes right about the fuel pump being spec'ed enough by a margin of error and im also an engineer.....340- you have brought nothing to the table except to slag Lewis off when he has given evidence and obviously has an engineering background.....you have only given I DONT KNOW ANSWERS............. keep the info going lewis.....PS i have an upgraded pump but it was on when i bought it so i win both ways LOL

Puff The Magic Wagon!

iTrader: (2)

With the increased need for fuel brought on by modifications such as a bigger turbo, why run the risk of running lean and blowing your expensive engine to pieces?

You may not need it, may not notice any difference in having it but you would notice IF your engine went "pop".

It's another one of those things that may not show any benefit or immediate return on purchase, but you will thank your investment if it does start to go pear-shaped.

Another such item is a Knocklink or perhaps a boost guage or any other preventative measures such as replacing the MAF regularly on an MY99 UK Turbo.

Not necessary all the time, but the question is - do you feel lucky?

PSL certainly does