An actual number; Was: how much gas could a pump pump if a pump could pump gas?

[mkii@nycap.rr.com (Josh Able)]

AHH..

Thanks!

can anybody confirm this, or prove it wrong?

I know somebody claims that the fuel system runs at 70psi which according to
http://www.theoldone.com/components/fuelpumps/ is about 50 gph.


Josh Able

"If you're already walking on thin ice, you might as well dance." -Gil
Atkinson

----- Original Message -----
From: "Dan Bubb" <jdbubb@ix.netcom.com>
To: "Josh Able" <mkii@nycap.rr.com>
Cc: <scirocco-l@scirocco.org>
Sent: Tuesday, July 02, 2002 7:52 AM
Subject: An actual number; Was: how much gas could a pump pump if a pump
could pump gas?


> Min fuel pump delivery rate is .47 gal/min. This is from the Bentley for
> an 84 Scirocco, but I doubt the 16V is different.
> That is 28.5 gal/hr. Note that this is tested by measuring flow out of
> the return line, which means it is flow against a minimum pressure of
> 4.7 bar. Which means it will deliver this flow rate at a boost pressure
> of 1.7 bar (assuming you're using a 3 bar FPR, which is the norm).
> So, 28.5 gal/hr X 6.4 lb/gal for 92 octane gives 182.6 lb/hr.
> At a BSFC of .5 this would be 365 HP.
> Your engine could have a BSFC as high as .6 which would equate to 304
> HP.
> So, yeah, after all the bullshit is said and done you may need a bigger
> pump.
> I'd check the fuel rail pressure while you run. If it's dropping at 4500
> RPM at WOT then you'll need a bigger pump.
> HTH
> Dan
>
> Josh Able wrote:
> >
> > the 310cc were running at the max, 475cc is a pretty big step up, and
with a
> > new chip its going to be allot different. If the tech that said 300hp is
> > about max that a scirocco set up can pump, then I had it totally maxed
out
> > already.
> >
> > >go smack them tuner bitches upside the head
> > > and tell em to get their stuff straight.
> >
> >  eh? they have their stuff straight, Im doing this myself. Hence it
working
> > prior to me changing it. .. and well it still works  since I pulled the
new
> > injectors and chip and slapped the old ones back in.
> >
> > > your car once could run to redline and be rich at the same time but
now
> > cuts out at 4500,
> >
> > *sigh
> > It ran rich because it was dumping more fuel in at lower rpms...not at
> > higher rpms. Hence blowing chunks when the turbo spooled up.
> >
> > So sue me for wanting to get over 300 at the wheels. :P
> >
> > Josh Able
> >
> > "If you're already walking on thin ice, you might as well dance." -Gil
> > Atkinson
> >
> > ----- Original Message -----
> > From: "Allyn" <amalventano1@comcast.net>
> > To: "Josh Able" <mkii@nycap.rr.com>; <scirocco-l@scirocco.org>
> > Sent: Monday, July 01, 2002 10:15 PM
> > Subject: Re: how much gas could a pump pump if a pump could pump gas?
> >
> > > if your car once could run to redline and be rich at the same time,
but
> > now cuts out at 4500, and
> > > all you changed was injectors, something is not right. go smack them
tuner
> > bitches upside the head
> > > and tell em to get their stuff straight.
> > > Al
> > >
> > > ----- Original Message -----
> > > From: "Josh Able" <mkii@nycap.rr.com>
> > > To: <scirocco-l@scirocco.org>
> > > Sent: Monday, July 01, 2002 10:00 PM
> > > Subject: Re: how much gas could a pump pump if a pump could pump gas?
> > >
> > >
> > > > Im told the scirocco set up is only good for about 300hp.
> > > >
> > > > The rabbit set up doesn't have that intank thing right?
> > > >
> > > > when I tried the 475cc injectors, my car ran out of gas at about
> > 4500rpms.
> > > > So I'm planning on doing away with the scirocco set up, just going
with
> > a
> > > > pickup and a bigger pump and upgrading the lines.
> > > >
> > > >
> > > > Josh Able
> > > >
> > > > "If you're already walking on thin ice, you might as well
dance." -Gil
> > > > Atkinson
> > > >
> > > > ----- Original Message -----
> > > > From: "Scott F. Williams" <sfwilliams@comcast.net>
> > > > To: "Josh Able" <mkii@nycap.rr.com>; "Scirocco List"
> > > > <scirocco-l@scirocco.org>
> > > > Sent: Monday, July 01, 2002 9:54 PM
> > > > Subject: RE: how much gas could a pump pump if a pump could pump
gas?
> > > >
> > > >
> > > > > Josh, why are you concerned with your pump, anyway? The stock CIS
fuel
> > > > pump
> > > > > is more than adequate for your needs. In fact, my RX-7 Turbo
friends
> > ask
> > > > me
> > > > > for "those Rabbit pumps" all the time. These guys are pumping out
over
> > > > 400hp
> > > > > and consider our pumps to be great upgrades.
> > > > > --
> > > > > Scott F. Williams
> > > > > NJ Scirocco nut
> > > > > '99 Subaru Impreza 2.5 RS
> > > > > Mazda 323 GTX turbo "assaulted" vehicle
> > > > > Golf GTI 16v "rollycar"
> > > > > ClubVAC: "Roads found. Drivers wanted."
> > > > >
> > > > > > The root problem is that Im dealing with a shop that rates its
pumps
> > on
> > > > a
> > > > > > gallon per hour basis, yet I cant find anybody that knows what a
> > > > scirocco
> > > > > > set up pumps per hour..
> > > > >
> > > > >
> > > > >
> > > >
> > > >
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> > >
> > >
> >
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