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Location:
sunny coast, qld
Registered:
October 2002
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Location:
Brisbane
Registered:
October 2002
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Re: Ray Hall hp calculator
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Fri, 02 September 2005 05:47
 
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bore: 3.523
stroke: 3.149
4 cyl
8000rpm
air temp 20
engine VE 82 {which is correct}
15pound boost
70% comp efficiency
IC efficiency
325hp
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Location:
sunny coast, qld
Registered:
October 2002
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Re: Ray Hall hp calculator
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Fri, 02 September 2005 06:32
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Can you do 0psi and see what you get? 
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Location:
sunny coast, qld
Registered:
October 2002
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Re: Ray Hall hp calculator
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Sun, 04 September 2005 14:33
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bump. come on its not that hard
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I supported Toymods
Location:
Sydney
Registered:
May 2002
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Location:
sunny coast, qld
Registered:
October 2002
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Re: Ray Hall hp calculator
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Sun, 04 September 2005 23:16
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Hmm, interesting. So yours came out very close to real life figures. When you used 50% intercooler efficiency, did the inlet temps match up to real life or can you not measure them?
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Location:
Melbourne
Registered:
June 2004
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Re: Ray Hall hp calculator
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Mon, 05 September 2005 03:14
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I just fudged all the efficiencies to make it spit out what Mine actually produces:
I figure the Intercooler is very efficient, since it's only flowing around 55% of it's rated maximum....
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I Supported Toymods
Location:
Glenmore Park, NSW
Registered:
March 2004
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Re: Ray Hall hp calculator
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Wed, 07 September 2005 08:11
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what sorta specs should i use for an average 18rgu?
made 61.3 rwkw on dyno... std all round as far as i know.
Cheers
Nathan
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Registered:
August 2002
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Re: Ray Hall hp calculator
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Wed, 07 September 2005 09:10
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i always thought VE for a forced induction car would be > 100% ?
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I supported Toymods
Location:
Sydney
Registered:
May 2002
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Re: Ray Hall hp calculator
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Wed, 07 September 2005 09:15
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| Chris Davey wrote on Mon, 05 September 2005 09:16 |
Hmm, interesting. So yours came out very close to real life figures. When you used 50% intercooler efficiency, did the inlet temps match up to real life or can you not measure them?
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well i guessed it like i said. its an MR, intercooler sits ontop of the engine in a relocated position. Tiny unit and I haven't measured the inlet outlet temps yet
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Location:
Dubbo
Registered:
April 2005
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Re: Ray Hall hp calculator
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Wed, 07 September 2005 22:52
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one problem is that this seems to fly in the face of the other formula for hp.
CFM = Displacement x revs x VE x pressure ratio / 2
and hp is supposedly
HP = CFM x MAP x Comp / 288.6
Of course the CFM can be made more accurate through adding air filter losses and intercooler losses...tho hardly worth it if u are guestimating the VE lol!
so if the hp is correct then it would seem that u need the comp to accurately work out the hp
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Location:
Melbourne
Registered:
June 2004
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Re: Ray Hall hp calculator
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Thu, 08 September 2005 05:56
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To put it another way, the most I've seen on the PowerFC is 79% duty cycle on the injectors. Pretty sure the RB25DET has 6x360cc/min injectors (2.16L/min at 100%). Figure a 13:1 (mass:mass) A/F ratio at max Hp, blah blah blah.... I'm going to bed. It makes 180kw at the treads, who cares what Mr. Hall's online HP calculator says!! I figure it's 300->308hp at the flywheel. Makes good with the moving and noise making... 
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