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

Subject: An actual number; Was: how much gas could a pump pump if a pumpcould pump gas?
From: jdbubb@ix.netcom.com (Dan Bubb)
Date: Wed, 03 Jul 2002 07:51:30 -0400
References: <NFBBIFEIOLEKBIKOONPOKEJFFLAB.sfwilliams@comcast.net> <000501c2216c$2f555020$26801918@mediaone.net> <00b201c2216e$4c0e7410$0200a8c0@al> <000b01c2216f$f5030ee0$26801918@mediaone.net> <3D219419.296D0FD0@ix.netcom.com> <005101c22208$5a0bca00$26801918@mediaone.net>

Josh:
The number is from the Bentley and is a minimum value.
Why don't you find out for sure instead of guessing.
Apply whatever max boost pressure you run to the FPR sense line with an
air compressor and measure the gas flow out the return line downstream
of the FPR.
It's dead butt simple to do and it will tell you the actual value for
your pump in your car.

Josh Able wrote:
> 
> 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..
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > > > _______________________________________________
> > > > > 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
> >
> > _______________________________________________
> > Scirocco-l mailing list
> > Scirocco-l@scirocco.org
> > http://neubayern.net/mailman/listinfo/scirocco-l
> >
> 
> _______________________________________________
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> Scirocco-l@scirocco.org
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References:
- how much gas could a pump pump if a pump could pump gas?
  - From: sfwilliams@comcast.net (Scott F. Williams)
- how much gas could a pump pump if a pump could pump gas?
  - From: mkii@nycap.rr.com (Josh Able)
- how much gas could a pump pump if a pump could pump gas?
  - From: amalventano1@comcast.net (Allyn)
- how much gas could a pump pump if a pump could pump gas?
  - From: mkii@nycap.rr.com (Josh Able)
- An actual number; Was: how much gas could a pump pump if a pump couldpump gas?
  - From: jdbubb@ix.netcom.com (Dan Bubb)
- An actual number; Was: how much gas could a pump pump if a pump could pump gas?
  - From: mkii@nycap.rr.com (Josh Able)

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