TomeiEvo

For the price of the Walbro, its hard to find anything better but if you're willing to pay the POWER ones from Japan rated at 210 l/hr and 255/hr is quiet but then again almost twice the price.. or alternatively the SARD ones which look more like a Nippondenso one..
I like the whine, it sort of give you the race car feeling... All my cars have a Walbro on them..

DoggieHowser

Was told the Power Enterprises unit from Japan is actually from Walbro too

And you end up paying more than double... :P

LilJapnBoy

iTrader: (6)

forgive the novice question and a little off topic but the answers on this thread seem quite informative.

does adding a fuel pump require larger (650) injectors to handle the additional fuel pressure? from the sounds of it, the answer seems like yes (or a fuel pressure regulator).

propellerhead

iTrader: (3)

Actually, no, larger injectors are not *required* to run a higher volume fuel pump. They are often done hand in hand because you really need to upgrade the pump to support the increased fuel flow to bring injector duty cycles down to reasonable levels (<80%). By installing the Walbro without an adjustable FPR you're effectively increasing the fuel output of the injector. The reason for this is that the fuel pressure rises from ~43.5 to ~52psi. This level of increase doesn't hurt the injector. This will cause a rich running condition. It seems most tuners compensate for the increased fuel pressure when they scale for larger injectors. The alternative is to measure base fuel pressure before the pump upgrade and then use an adjustable FPR afterwards to restore AFRs.

Also, for what it's worth, from what I've read, it's okay to run most fuel injectors up to 4 bar (58 psi) of fuel pressure and not have issues as long as you scale your fuel maps to compensate. This allows you to stretch out the useful life of a set of injectors. For example, stock 550s would flow 635cc/min at 58psi, a 15% increase in fuel flow.

Eon

iTrader: (4)

I have a Walbro and really dont notice that much of a difference in noise......

LilJapnBoy

iTrader: (6)

thanks for the info propellorhead! very informative.
I am assuming that the increase in fuel pressure will also increase the regularity to clean/change your injectors if you're still running stock (525cc)?

In my situation I was planning on installing a fuel pump and then getting my S-AFC2 accordingly...

propellerhead

iTrader: (3)

You're welcome. I learnt it all from books.

Stockers are 550s or 560s depending on who you talk to.

I don't think running more fuel flow or pressure doesn't mean you need to clean your injectors more often. Dirty fuel does though.

Soon2BEVO

iTrader: (41)

If this is the case then why on one thread were people constantly complaining about the Walboro's noise when they had less 1/4 tank of gas or less left?

I do remember hearing something about this voltage stuff somewhere with the EVO's fuel pump. Either way, I think Ill end up getting a Walboro and if something better comes out, Ill just get that! IF the Walboro is indeed too noisey.

ThEHiTMaN

iTrader: (9)

Mine is quiet also. But heat that thing up with a long drive/hard driving with 1/4 tank of gas and we are talking loud. But I am all about Function over Form. If it works it works who cares if it's $90. Actually Al told me mine was one of the loudest he has ever heard. Then again I drove an hour and 30min to the tune then 2 hours of tuning the pump was whistling rather loudly. Got it home let it cool down for 4 hours started it up and no sound. It all depends on how hard you work them.

freedom

iTrader: (1)

Power used to be a Denso pump. But they confirm that their pump is manufactured by an alternate firm. That said it is copy of the Denso and looks identical in all respects. The issue in my mind is that it represents an unknown quantity.

Where have you seen the SARD pump?

bolsen

iTrader: (2)

bookmarked.


AMS has a solution, but it's 1200$

propellerhead

iTrader: (3)

Yep. I've actually seen the dual circuit in the service manual. That's why I was surprised to hear that there may be Evos without it. I've also seen a tech article by RRE discussing the volume output of several aftermarket fuel pumps at both 12 volts and 13.8 volts. They mentioned the dual circuit. My take was that some improvement was to be made by using the dual circuit to drive a heavy duty relay to switch power on from a very heavy gauge battery lead back at the pump itself.

ThEHiTMaN

iTrader: (9)

If the car had this dual "stage" power supply would it still get loud after the pump was worked very hard or for a very long time?

propellerhead

iTrader: (3)

I suppose it could. I figure there's two issues involved. One, less fuel means the pump will heat up, perhaps vibrating differently in the pump carrier. Two, less fuel mean less sound dampening.

FWIW, EVERY VW I have ever owned made noise when the fuel level dropped below a quarter of a tank.

Man, I wonder what one of these "loud" pumps sounds like. Mine is so damn quiet that I forget it's there. Only when I drop down to an 1/8 of tank do I even remotely hear the pump. Weird.

TomeiEvo

Nope its not. I had a Power 210 l/hr pump and I saw the 255 l/hr one.. Color is black on the power ones and physically the POWER unit way longer on the 210 l/hr and way bigger in diameter in the 255 l/hr and its quiet. Want a quiet one, pay more then.. No doubt Walbro is the cheapest and best value for money.. Why do you think I have it in all my cars..