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

[jdbubb@ix.netcom.com (Dan Bubb)]

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..
> > > >
> > > >
> > > >
> > >
> > >
> > > _______________________________________________
> > > Scirocco-l mailing list
> > > Scirocco-l@scirocco.org
> > > http://neubayern.net/mailman/listinfo/scirocco-l
> >
> >
> 
> _______________________________________________
> Scirocco-l mailing list
> Scirocco-l@scirocco.org
> http://neubayern.net/mailman/listinfo/scirocco-l