Interesting Turbo Flow #'s
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Pr0n King
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Interesting Turbo Flow #'s
IHI VF 23 430 CFM at 18 PSI <--- estimated
IHI VF-30 460 CFM at 18.0 PSI <--- estimate based on trap speeds of cars running this turbo
AVO 320HP 465 CFM at 17.5 PSI
T04E 40 trim 465 CFM at 22 PSI
STOCK HYBRID 490 CFM at 18.0 PSI
IHI VF-22 490 CFM at 18.0 PSI <--- refigured
SR 30 490 CFM at 22 PSI
Small 16G 490 CFM at 22 PSI
PE1818 515 CFM at 22 PSI <--- estimated from manufactures rated max power
IHI VF-30 460 CFM at 18.0 PSI <--- estimate based on trap speeds of cars running this turbo
AVO 320HP 465 CFM at 17.5 PSI
T04E 40 trim 465 CFM at 22 PSI
STOCK HYBRID 490 CFM at 18.0 PSI
IHI VF-22 490 CFM at 18.0 PSI <--- refigured
SR 30 490 CFM at 22 PSI
Small 16G 490 CFM at 22 PSI
PE1818 515 CFM at 22 PSI <--- estimated from manufactures rated max power
Also notice that the Small 16g flows the same as the bolt-on VF22, and the PE1818 is 25cfm ahead of 16g...
The large 16g (not shown) is 5cfm ahead of the PE1818 @ 520cfm @ 22psi.
Interesting stuff. Some of the IHI offerings may not be that "puny" - but there's some flow to be had from the PE series, and if you can get a cheap 16g in your WRX you're makin' power and savin' cash!
I'm not even going into reliability.
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Pr0n King
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Note, these figures are taken from Hotrod (Larry @ NASIOC)'s turbo list. This guy is great to read!
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Interesting...
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small 16g outflows a large 16g at 22psi, is that a typo?
sounds like a good turbo if not
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Nope its not a typo. This is an example why it is so stupid for the manufactures to make it so hard to find compressor maps.
The large 16G compressor map is much narrower than the small 16G. In its sweet flow area it will go to higher pressure ratios, but at high flow numbers you fall off the right side of the compressor map.
You could actually get the flow numbers probably, but it would be hot enough that the actual mass flow would be the same or less.
You'll also note that the 16G large has much lower effeciency (71%) compared to the effeciency of the 16g small (77%) so in terms of mass flow the 16g small CFM's are at any given flow rate, probably cooler and more dense than the 16G large.
sounds like a good turbo if not
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Nope its not a typo. This is an example why it is so stupid for the manufactures to make it so hard to find compressor maps.
The large 16G compressor map is much narrower than the small 16G. In its sweet flow area it will go to higher pressure ratios, but at high flow numbers you fall off the right side of the compressor map.
You could actually get the flow numbers probably, but it would be hot enough that the actual mass flow would be the same or less.
You'll also note that the 16G large has much lower effeciency (71%) compared to the effeciency of the 16g small (77%) so in terms of mass flow the 16g small CFM's are at any given flow rate, probably cooler and more dense than the 16G large.
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I'm just posting this because I had visited here with the intent of 'learning' what cfm, a/r, 'area under the curve', pressure ratio, volumetric efficiency...
http://64.225.76.178/catalog/compmaps/fig1.html
http://www.vfaq.com/mods/Turbo-compressor-maps.html
I've got a great book, that while hard for a noob like myself to read, I'm trying to nug my way through it. It's called Turbochargers, by Hugh MacInnes. It's an HP book. My overall intent is to not have to take someone's word for which turbo is best for which application/need.
This crap is hard. I have a lower IQ than a rock. I guess I've got nothing better to do.
http://64.225.76.178/catalog/compmaps/fig1.html
http://www.vfaq.com/mods/Turbo-compressor-maps.html
I've got a great book, that while hard for a noob like myself to read, I'm trying to nug my way through it. It's called Turbochargers, by Hugh MacInnes. It's an HP book. My overall intent is to not have to take someone's word for which turbo is best for which application/need.
This crap is hard. I have a lower IQ than a rock. I guess I've got nothing better to do.
Last edited by gpatmac; Dec 26, 2002 at 02:54 PM.
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Pr0n King
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Pat,
I'm impressed! Turbo compressor maps are heady things... I hate math.
Aloha,
Richard...
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I'm impressed! Turbo compressor maps are heady things... I hate math.
Aloha,
Richard...
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I've got that one, too, but right now it's like reading Greek Algebra. Me trying to learn is like trying to cram 10lbs of crap into a 5lb bag.
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Pr0n King
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Great finds, Pat!
With all this research that you've been doing - where did you find the time to get yourself in the same predicament as Dom?
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With all this research that you've been doing - where did you find the time to get yourself in the same predicament as Dom?
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You sexy beast, you! I know how it feels.
P.S. So what has your turbo investigation taught you? I figured that it takes all the money that I don't have to pioneer anything that isn't tried and true...
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P.S. So what has your turbo investigation taught you? I figured that it takes all the money that I don't have to pioneer anything that isn't tried and true...
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Richard,
Not trying to be funny, but this stuff is plain humbling...I haven't learned a lot.
What I'm pushing towards right now; forcing my brain to focus on, is seeing what sort of capabilities the VF30 provides, as far a VE. Where is it going to benefit me along the curve? But I'm not getting very far. I know (122in x 6000rpm(avg))/3456 = a 100% cfm of 212. 85% of that is 180, so....and I've stopped there. Well, it does seem like our car's cfm would be about 151???
I know that if I'm shooting for 18lbs of boost, and I utilize 14.7 as the ambient pressure, then PR=2.26.
I haven't figured out Density Ratio and it's relationship to anything, but I guess if you want a turbo at 65% efficiency, then if PR=2.26, then your density ratio would be 1.62.
As I keep reading, I get more and more CORNFUSED! I'm going to put this book down and start Corky Bell's tomorrow.
Not trying to be funny, but this stuff is plain humbling...I haven't learned a lot.
What I'm pushing towards right now; forcing my brain to focus on, is seeing what sort of capabilities the VF30 provides, as far a VE. Where is it going to benefit me along the curve? But I'm not getting very far. I know (122in x 6000rpm(avg))/3456 = a 100% cfm of 212. 85% of that is 180, so....and I've stopped there. Well, it does seem like our car's cfm would be about 151???
I know that if I'm shooting for 18lbs of boost, and I utilize 14.7 as the ambient pressure, then PR=2.26.
I haven't figured out Density Ratio and it's relationship to anything, but I guess if you want a turbo at 65% efficiency, then if PR=2.26, then your density ratio would be 1.62.
As I keep reading, I get more and more CORNFUSED! I'm going to put this book down and start Corky Bell's tomorrow.
