SVX Network Forums Live Chat! SVX or Subaru Links Old Lockers Photo Post How-To Documents Message Archive SVX Shop Search |
IRC users: |
#1
|
||||
|
||||
cfm to hp conversion
i was wondering if anyone knows what the the ratio was for CFM to horsepower conversion was for the eg33
__________________
Tranny goes in, tranny comes out, tranny goes in.....AW ****, tranny comes out.... |
#2
|
||||
|
||||
Re: cfm to hp conversion
Quote:
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?
__________________
www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link |
#3
|
||||
|
||||
Re: cfm to hp conversion
gauging turbos which are too big or too small
__________________
Tranny goes in, tranny comes out, tranny goes in.....AW ****, tranny comes out.... |
#4
|
||||
|
||||
Re: cfm to hp conversion
I am not the guy to ask. I have a 1750 CFM belt driver supercharger on my Claret. But with the right pulley combination I can make the SC smaller.
__________________
www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link |
#5
|
||||
|
||||
Re: cfm to hp conversion
i tried PMing Tom but his box is full
__________________
Tranny goes in, tranny comes out, tranny goes in.....AW ****, tranny comes out.... |
#6
|
||||
|
||||
Re: cfm to hp conversion
YT has not done a turbo 3.3...
yet
__________________
www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link |
#7
|
||||
|
||||
Re: cfm to hp conversion
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.
__________________
Chris 92 Ebony Mica LS-L "A Rolling Restoration": 223,250 KM - Sleeping 2007 STi 6MT, Stance GR+ coilovers, PWR Rad, JDM hood badge, svxfiles 6000K HIDs, JDM Clear Corners, $15/15 min mod, $20/20 min mod, Energy Swaybar Bushings, Hella Supertones horns, Gold STi BBS rims, Group A lightweight crank pulley, A/C system removed, Custom header-back exhaust, Hybrid carbon/metal rear sway bar, restored headlights with CCFL halos 2008 Subaru Legacy Spec B - Diamond Grey Metallic - Sold 2020 Ram 1500 Longhorn - Red Pearl |
#8
|
||||
|
||||
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
__________________
Tranny goes in, tranny comes out, tranny goes in.....AW ****, tranny comes out.... |
#9
|
||||
|
||||
Re: cfm to hp conversion
Quote:
__________________
Elazar '08 ML550 daily driver '13 F150 work truck '87 MR2 racecar '92 Lsl Claret 5sp "Be kind to your motor car." - Jackie Stewart |
#10
|
||||
|
||||
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.
__________________
www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link |
#11
|
||||
|
||||
Re: cfm to hp conversion
Quote:
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.
__________________
Tranny goes in, tranny comes out, tranny goes in.....AW ****, tranny comes out.... |
#12
|
|||
|
|||
Re: cfm to hp conversion
Volumetric Efficiency
__________________
'92 SVX LS Pearl White - 6mt |
#13
|
||||
|
||||
Re: cfm to hp conversion
VE=Volumetric Efficiency
In theory.
__________________
Elazar '08 ML550 daily driver '13 F150 work truck '87 MR2 racecar '92 Lsl Claret 5sp "Be kind to your motor car." - Jackie Stewart |
#14
|
||||
|
||||
Re: cfm to hp conversion
Quote:
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?
__________________
Elazar '08 ML550 daily driver '13 F150 work truck '87 MR2 racecar '92 Lsl Claret 5sp "Be kind to your motor car." - Jackie Stewart |
#15
|
||||
|
||||
Re: cfm to hp conversion
Quote:
Volumetric efficiency changes with engine design, and is different at almost all RPMs. With our IRIS we can achieve over 100% VE! 12:1 A/F is a safeish, but not ideal ratio. Our average intake manifold temperature is 200°f! Sean, "musings", nice choise!
__________________
www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link |
|
|