PM-Performance

Jus curious what i can run safely on my 550's. thanks

DIRep972

iTrader: (1)

at stock fuel pressure Josh(hybrid901) maxed out his 550's at about 375whp w/ a 60-1 hifi turbo gsr @ 17lbs of boost.

FFormula1

(100% duty cycle) 4 * 550cc/min = 2200cc/min -> 3.489lbs/min -> 209.35lb/hr.

<FONT COLOR="blue">Lean</FONT> 209.35lb/hr / 0.45lb/hp/hr = 465.22hp
----- 209.35lb/hr / 0.5lb/hp/hr = 418.7hp
<FONT COLOR="red">Rich</FONT> 209.35lb/hr / 0.55lb/hp/hr = 380.64hp

dfoxengr

with a 12:1 FMU a few of my friends on 440s have hit 500 whp at 22lbs

Chrome Pipes

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hybridvteceg &raquo;</TD></TR><TR><TD CLASS="quote">with a 12:1 FMU a few of my friends on 440s have hit 500 whp at 22lbs</TD></TR></TABLE>

Thats Awsome! I'm running that same fuel setup on my car right now and it drives perfect, no stumbles or bogs. 96 EK, Stock GSR, Skunk 2 manifold, DRAG III, 9 psi = 12.34 @ 110 mph

VTgringo

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Muffin' &raquo;</TD></TR><TR><TD CLASS="quote">(100% duty cycle) 4 * 550cc/min = 2200cc/min -&gt; 3.489lbs/min -&gt; 209.35lb/hr.

<FONT COLOR="blue">Lean</FONT> 209.35lb/hr / 0.45lb/hp/hr = 465.22hp
----- 209.35lb/hr / 0.5lb/hp/hr = 418.7hp
<FONT COLOR="red">Rich</FONT> 209.35lb/hr / 0.55lb/hp/hr = 380.64hp</TD></TR></TABLE>

Being an engineer i appreciate those calculations, although i haven't looked through them. Looks good

dfoxengr

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chrome Pipes &raquo;</TD></TR><TR><TD CLASS="quote">

Thats Awsome! I'm running that same fuel setup on my car right now and it drives perfect, no stumbles or bogs. 96 EK, Stock GSR, Skunk 2 manifold, DRAG III, 9 psi = 12.34 @ 110 mph</TD></TR></TABLE>
sweet. thats why i love FMUs, but you cant beat a good engine management program either, lol...

PM-Performance

damn i cant believe all that on an fmu, thats sick .
the reason why im asking is becuase im building up my motor in a few weeks, and wanted to get an idea what i can get out of these things before i sell them for bigger. with the engine build up , i wont have money left for injectors for a little

chidoks

let me know when u are selling them, 'cos i need 550's and i am not too far from u

PM-Performance

ok

95GS-R

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Muffin' &raquo;</TD></TR><TR><TD CLASS="quote">
0.45lb/hp/hr
0.5lb/hp/hr
0.55lb/hp/hr
</TD></TR></TABLE>

I follow the other part, but how do you establish these numbers? Would these numbers apply to all engines? Or were they calculated just for itr206's type of car?

VTgringo

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 95GS-R &raquo;</TD></TR><TR><TD CLASS="quote">

I follow the other part, but how do you establish these numbers? Would these numbers apply to all engines? Or were they calculated just for itr206's type of car?</TD></TR></TABLE>

It comes from the enthalpy of reaction, meaning that 209lb/hr of gas, when burned has a certain amount of energy and depending on the temperature (rich or lean) you can get more or less energy from the burn. then since an engine isn't a perfectly effecient machine you multiply that number by a the effeciency of the engine, which should be the about the same give or take for any 4 cylinder. I would say if those numbers are accurate, they should apply to any engine, give or take a few hp. Hope that helps, I'm studying this stuff right now and just had a test......im sure I'll forget it all in a few days....haha.

Evan

hatchy

http://www.rceng.com/technical.htm

At the bottom of the page, there is a handy calculator that will give you an idea of the size of injectors you need to support a given horsepower number.

b18cTurbo

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hybridvteceg &raquo;</TD></TR><TR><TD CLASS="quote">with a 12:1 FMU a few of my friends on 440s have hit 500 whp at 22lbs</TD></TR></TABLE>
how can this be possible?12*22=264+50psi stock pressure=314psi fuel rail pressure @22 psi!

dfoxengr

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 11sec.sleeper &raquo;</TD></TR><TR><TD CLASS="quote">
how can this be possible?12*22=264+50psi stock pressure=314psi fuel rail pressure @22 psi!
</TD></TR></TABLE>
who cares how its possible, it is...
that setup consists mostly of inline pro guys...