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Puny fuel injectors
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I don't know a lot about turbos, but I do know some companies have taken =
the 1.8T to 350hp on the flywheel.
Why don't call TAP , they are the Audi guys, they should give you an =
answer.
----- Original Message -----=20
From: Scott F. Williams=20
To: DEMETRIS RAPTIS ; scirocco-l@scirocco.org=20
Sent: Friday, June 14, 2002 12:19 PM
Subject: RE: Puny fuel injectors
Demetri, plug in the following numbers at =
<http://www.rceng.com/technical.htm#WORKSHEET>:
700hp
6 fuel injectors
.60 brake specific fuel consumption
.80 max injector duty cycle
57.2psi fuel pressure (the same as Josh, btw)
Hit the calculate button and what do you get? Those injectors must be =
76.44 lbs/hour (803cc/min) to make that kind of power safely. What does =
that tell you? The performance of Porsche's highly developed 911 twin =
turbo motor is bound by the same laws of physics as everybody else's. =
The math that we've applied to this situation holds up just fine.
Or, with a little bit more analysis you can see how much fuel flow it =
takes for the Porsche to make each single horsepower unit:
700hp/ 6 cylinder =3D 116.67 hp per cylinder
803cc per injector/ 116.67hp =3D 6.88cc to generate 1 hp
Meanwhile, Josh is claiming:
approx. 325hp/ 4 cylinders =3D 81.25hp per cylinder
310cc per injector/ 81.25hp per cylinder =3D 3.82cc to generate 1hp
So, although the 911 Turbo's specific output is around 31% greater =
than the 1.8T (81.25hp/117hp =3D .69), Josh is claiming that his motor =
is 44% more efficient at making power (3.82cc/6.88cc =3D .56). DOES THIS =
MAKE ANY SENSE AT ALL? How can his motor be radically more efficient yet =
far less powerful when corrected for the number of cylinders? For an =
easy comparison, that 911 motor would output a "mere" 487.5hp if its =
specific output matched Josh's 1.8T .
Something is terribly wrong with this picture. What is it?
--
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."=20
Demetri Raptis wrote:
You guys got me to look at some articles for some twin turbo 911s, =
and they run 75 lbs/hr injectors to make 700 horses. I would think josh =
is right.
demetri
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<DIV><FONT face=3DArial size=3D2>I don't know a lot about turbos, but I =
do know some=20
companies have taken the 1.8T to 350hp on the flywheel.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Why don't call TAP , they are the Audi =
guys, they=20
should give you an answer.</FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dsfwilliams@comcast.net =
href=3D"mailto:sfwilliams@comcast.net";>Scott F.=20
Williams</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Draver@prodigy.net=20
href=3D"mailto:raver@prodigy.net";>DEMETRIS RAPTIS</A> ; <A=20
title=3Dscirocco-l@scirocco.org=20
href=3D"mailto:scirocco-l@scirocco.org";>scirocco-l@scirocco.org</A> =
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Friday, June 14, 2002 =
12:19=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> RE: Puny fuel =
injectors</DIV>
<DIV><BR></DIV>
<DIV><SPAN class=3D670111215-14062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>Demetri, plug in the following numbers at <<A=20
=
href=3D"http://www.rceng.com/technical.htm#WORKSHEET";>http://www.rceng.co=
m/technical.htm#WORKSHEET</A>>:</FONT></SPAN></DIV>
<DIV><SPAN class=3D670111215-14062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D670111215-14062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>700hp</FONT></SPAN></DIV>
<DIV><SPAN class=3D670111215-14062002><FONT face=3DArial =
color=3D#0000ff size=3D2>6=20
fuel injectors</FONT></SPAN></DIV>
<DIV><SPAN class=3D670111215-14062002><FONT face=3DArial =
color=3D#0000ff size=3D2>.60=20
brake specific fuel consumption</FONT></SPAN></DIV>
<DIV><SPAN class=3D670111215-14062002><FONT face=3DArial =
color=3D#0000ff size=3D2>.80=20
max injector duty cycle</FONT></SPAN></DIV>
<DIV><SPAN class=3D670111215-14062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>57.2psi fuel pressure (the same as Josh, =
btw)</FONT></SPAN></DIV>
<DIV><SPAN class=3D670111215-14062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D670111215-14062002><FONT face=3DArial =
color=3D#0000ff size=3D2>Hit=20
the calculate button and what do you get? Those injectors must be =
76.44=20
lbs/hour (803cc/min) to make that kind of power safely. </FONT><SPAN=20
class=3D670111215-14062002><FONT face=3DArial color=3D#0000ff =
size=3D2>What does that=20
tell you? The performance of Porsche's highly developed 911 twin turbo =
motor=20
is bound by the same laws of physics as everybody else's. The math =
that we've=20
applied to this situation holds up just fine.</FONT></SPAN></DIV>
<DIV><FONT face=3DArial><FONT color=3D#0000ff><FONT=20
size=3D2></FONT></FONT></FONT> </DIV>
<DIV><FONT size=3D+0><FONT size=3D+0><FONT face=3DArial =
color=3D#0000ff size=3D2>Or,=20
with a little bit more <SPAN class=3D670111215-14062002>analysis =
</SPAN>you=20
can see how much fuel flow it takes for the Porsche to make each =
single=20
horsepower unit:</FONT></FONT></FONT></SPAN></DIV>
<DIV><SPAN class=3D670111215-14062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>700hp/ 6 cylinder =3D 116.67 hp per =
cylinder</FONT></SPAN></DIV>
<DIV><SPAN class=3D670111215-14062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>803cc per injector/ 116.67hp =3D 6.88cc to generate 1=20
hp</FONT></SPAN></DIV>
<DIV><SPAN class=3D670111215-14062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D670111215-14062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>Meanwhile, Josh is claiming:</FONT></SPAN></DIV>
<DIV><SPAN class=3D670111215-14062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>approx. 325hp/ 4 cylinders =3D 81.25hp per =
cylinder</FONT></SPAN></DIV>
<DIV><SPAN class=3D670111215-14062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>310cc per injector/ 81.25hp per cylinder =3D 3.82cc to =
generate=20
1hp</FONT></SPAN></DIV>
<DIV><SPAN class=3D670111215-14062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D670111215-14062002><FONT face=3DArial =
color=3D#0000ff size=3D2>So,=20
although the 911 Turbo's specific output is around 31% greater than =
the 1.8T=20
(81.25hp/117hp =3D .69), Josh is claiming that his motor is 44% more =
efficient=20
at making power (3.82cc/6.88cc =3D .56). DOES THIS MAKE ANY SENSE AT =
ALL? How=20
can his motor be radically more efficient yet far less powerful when =
corrected=20
for the number of cylinders? For an easy comparison, that 911 motor =
would=20
output a "mere" 487.5hp if its specific output matched=20
Josh's 1.8T .</FONT></SPAN></DIV>
<DIV><SPAN class=3D670111215-14062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D670111215-14062002><FONT face=3DArial =
color=3D#0000ff=20
size=3D2>Something is terribly wrong with this picture. What is=20
it?</FONT></SPAN></DIV>
<DIV><FONT size=3D2>--<BR>Scott F. Williams<BR>NJ Scirocco nut<BR>'99 =
Subaru=20
Impreza 2.5 RS<BR>Mazda 323 GTX turbo "assaulted" vehicle<BR>Golf GTI =
16v=20
"rollycar"<BR>ClubVAC: "Roads found. Drivers wanted."</FONT> </DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV><SPAN class=3D670111215-14062002><FONT size=3D2>Demetri Raptis=20
wrote:</FONT></SPAN></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px =
solid; MARGIN-RIGHT: 0px">
<DIV class=3DOutlookMessageHeader dir=3Dltr align=3Dleft><FONT =
face=3DArial=20
size=3D2>You guys got me to look at some articles for some twin =
turbo 911s,=20
and they run 75 lbs/hr injectors to make 700 horses. I would think =
josh is=20
right.</FONT></DIV>
<DIV><FONT face=3DArial=20
size=3D2>demetri</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>
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