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conig
Dodge Dakota
JOIN HERE
3/07/2002
22:47:44
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 Subject: cfm requirements for 4.7L
IP: Logged
Message:
how much cfm in stock or slightly modified(can't be that much different anyway) does the 4.7 require.
modified being say pcm, throttle body, catback and poor boy cold air intake.
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conig
Dodge Dakota
JOIN HERE
3/08/2002
18:19:47
| RE: cfm requirements for 4.7L
IP: Logged
Message:
anyone have a guess? isn't the 65mm 750 cfm.
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CW
GenIII
3/08/2002
20:40:07
|  RE: cfm requirements for 4.7L
IP: Logged
Message:
Yeah there is a formula out there now if I can just remember it.
2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported 68mm throttle body, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat. Electric fan Convertion, HO cams installed.
Working on adjustable fuel pressure with return.
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Dr Q
DakotaEnthusiast
3/10/2002
11:42:18
| RE: cfm requirements for 4.7L
IP: Logged
Message:
287 (cu. in displacement) X 6000 (redline RPM)/1728 (cu. in per cu ft)=997 CFM is that right CW? Just a guess.
Q
Dr.Q
'01 Patriot Blue SLT RC 4.7 5sp 3.92 pegleg
0-60 @ 6.20sec.
1/4mi @ 14.75@97.1
Home Brew Airbox
K&N Drop In
Lakewood Traction Bars
Dremel TB Port and Polish
|
CW
GenIII
3/10/2002
12:14:46
| RE: cfm requirements for 4.7L
IP: Logged
Message:
Umm doesn't look right but it could be. Found a online calcuator. CFM calc
2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported 68mm TB, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat, Electric fan Convertion, HO cams.
Working on adjustable fuel pressure with return.
|
CW
GenIII
3/10/2002
12:20:00
| RE: cfm requirements for 4.7L
IP: Logged
Message:
That little motor only needs 500 to 600 CFM to be happy at 6000. Personaly I think a ported stock style throttle body is sufficent. Like the fast man. Mind you this is all bench racing so I haven't had anything on the dyno or driven in real life.
2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported 68mm TB, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat, Electric fan Convertion, HO cams.
Working on adjustable fuel pressure with return.
|
Dr Q
DakotaEnthusiast
3/10/2002
12:45:55
| RE: cfm requirements for 4.7L
IP: Logged
Message:
Well you learn something every day. Question: what kind of manifold on the 4.7? And what exactly is volumetric efficientcy?
Dr.Q
'01 Patriot Blue SLT RC 4.7 5sp 3.92 pegleg
0-60 @ 6.20sec.
1/4mi @ 14.75@97.1
Home Brew Airbox
K&N Drop In
Lakewood Traction Bars
Dremel TB Port and Polish
|
CW
GenIII
3/10/2002
12:52:11
| RE: cfm requirements for 4.7L
IP: Logged
Message:
I put in dual plane because it is closer than a single plane and figured a 80% VE it is a pretty efficient engine in stock trim.
2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported 68mm TB, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat, Electric fan Convertion, HO cams.
Working on adjustable fuel pressure with return.
|
Dr Q
DakotaEnthusiast
3/10/2002
13:11:10
| RE: cfm requirements for 4.7L
IP: Logged
Message:
Learning more of the finerpoints on a daily basis, thanks CW! Hey I'm starting to set aside cash for the powertrax no-slip unit We've got a chrysler 9.25 31 slpine diff-Right? One diffectomy coming up!
Q
Dr.Q
'01 Patriot Blue SLT RC 4.7 5sp 3.92 pegleg
0-60 @ 6.20sec.
1/4mi @ 14.75@97.1
Home Brew Airbox
K&N Drop In
Lakewood Traction Bars
Dremel TB Port and Polish
|
CW
GenIII
3/10/2002
13:47:58
| RE: cfm requirements for 4.7L
IP: Logged
Message:
It is a 9.25 diff I am not positive on the spline count but 31 sounds right.
2001 RC 4.7 5sp 9.25" 3.92 LSD
Ported 68mm TB, IAT adjuster, 3" flowmaster cat back, TPS @ .76V, 4" cold air, Roadmaster active suspention, Removed Third cat, Electric fan Convertion, HO cams.
Working on adjustable fuel pressure with return.
|
conig
Dodge Dakota
JOIN HERE
3/10/2002
19:55:29
| RE: cfm requirements for 4.7L
IP: Logged
Message:
I wasn't asking for the throttle body I was asking so I could find a filter with proper cfm requirements.
thanks for the info.
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tim
Dodge Dakota
JOIN HERE
3/10/2002
22:42:00
|  RE: cfm requirements for 4.7L
IP: Logged
Message:
Heck with the C.F.M. what color are you gonna get
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conig
Dodge Dakota
JOIN HERE
3/11/2002
13:33:22
| RE: cfm requirements for 4.7L
IP: Logged
Message:
I want a multy color one like a raimbow! ricers would love me.
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