cfm to hp conversion
i was wondering if anyone knows what the the ratio was for CFM to horsepower conversion was for the eg33
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Re: cfm to hp conversion
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If we have a 202.5 CID FOUR STROKE engine, turning at 5400 RPM, assuming 100% volumetric efficiency, the engine pumps 546,750 CID/M. Or 316.40625 CFM. Sooo our 230 HP takes 316.4CFM, or .7269135 HP per CFM. Or 1 HP per 1.3756793 CFM. Why do you ask? |
Re: cfm to hp conversion
gauging turbos which are too big or too small
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I am not the guy to ask.:o I have a 1750 CFM belt driver supercharger on my Claret.:rolleyes: But with the right pulley combination I can make the SC smaller. |
Re: cfm to hp conversion
i tried PMing Tom but his box is full
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yet |
Re: cfm to hp conversion
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Gamesy, check out Garrett's site (Link), they have a lot of good info regarding turbo selections. Around here somewhere I have the calculations showing that for ~600 HP you'd need either a single GT3788 or 4088 pushing about 23-25 PSI, or a pair of GT2860RS in the 76 trim, 0.86 A/R running the same pressure. A TT setup for that sort of power would be difficult though, those turbos would be running right to their upper limits. For those power levels the engine would be consuming 44-63 lb/min of air. Not sure what that works to in CFM. |
Re: cfm to hp conversion
thx crazy, but i dont plan on running that much power lol just to put the car a little over 300
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Re: cfm to hp conversion
If you did not alter the stock VE,
with the appropriate A/F ratio, you would only need 7.5 PSI, OF COLD AIR, to make 345 crankshaft HP, in theory, of course.:o |
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so the assumption is that stock 230 crank hp is roughly 180 whp 7.5psi would be roughly 270. roughly what an sti puts to the wheels. |
Re: cfm to hp conversion
Volumetric Efficiency
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Re: cfm to hp conversion
VE=Volumetric Efficiency
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With your example of 345 HP at 92% VE, ~12:1 A/F, 130 deg. manifold temp, at 6500 RPM it would need 7.9 lbs. Does VE change with forced induction or is that changed with engine mods, ie: intake or exhaust mods, ported heads, ect? |
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Volumetric efficiency changes with engine design, and is different at almost all RPMs. With our IRIS we can achieve over 100% VE!:eek: 12:1 A/F is a safeish, but not ideal ratio. Our average intake manifold temperature is 200°f!:eek: Sean, "musings", nice choise!;) |
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