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How much gain from a cold air system?
#1130320
12/09/11 02:17 AM
12/09/11 02:17 AM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
OP
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OP
master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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My car has uncoated headers and tends to get pretty dang hot under the hood. How much performance gains could be seen from grabbing air from outside the engine compartment?
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: How much gain from a cold air system?
[Re: StealthWedge67]
#1130324
12/09/11 08:59 AM
12/09/11 08:59 AM
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Joined: Jan 2003
Posts: 10,015
Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
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Posts: 10,015
Frostbitefalls MN (Rocky&Bullw...
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Good rule of thumb is 1 percent hp for every 11 degrees reduction. So a lot depends on how the air is flowing to your carb before the cold air intake is added. Another important item is the carb entry. A well radiused aircleaner base is important, and stay away from the lids that have filters in them. From a really bad setup to the best possible you could pick up .3 or so, between lid, base, and cold air. It is a system. If what you have is pretty good, might not see much over .1.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: How much gain from a cold air system?
[Re: tboomer]
#1130327
12/09/11 02:51 PM
12/09/11 02:51 PM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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Quote:
Quote:
We gained almost 5mph and went from 10.42 at 127.8 to 10.21 at 132mph....
Holy crap!! On what car,if I may ask? 
Yea really !  Ron
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Re: How much gain from a cold air system?
[Re: BradH]
#1130331
12/09/11 07:01 PM
12/09/11 07:01 PM
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Joined: Jul 2006
Posts: 4,319
Puyallup, WA
StealthWedge67
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OP
master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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I wouldn't be adding a hood scoop, I'd be drawing from the fenderwells through the caster / camber adjust holes, with a sealed system. My current setup is pretty low budget. Its just a 14" drop base with a 3" element, which makes for a narrow pinch point inside the assembly. This coupled with the choke horn on the primary side of the carb makes for what seems like a somewhat restrictive setup that is sucking in hot air. Sounds like most people see at least some gains, I think this mod will be in the works for the winter; along with milling the choke horn off, and maybe moving my battery to the trunk. Thanks guys
Last edited by GEnsrud; 12/09/11 07:07 PM.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: How much gain from a cold air system?
[Re: Dragula]
#1130333
12/09/11 08:32 PM
12/09/11 08:32 PM
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Joined: Aug 2003
Posts: 4,055
Salina ks
572_dup2
Back On The Bumper!!
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Back On The Bumper!!
Joined: Aug 2003
Posts: 4,055
Salina ks
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With my 2x4s after i added the crazy scoop on top of what i had i picked up nearly 4mph.
Shawn Jennings
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Re: How much gain from a cold air system?
[Re: StealthWedge67]
#1130334
12/09/11 08:54 PM
12/09/11 08:54 PM
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Joined: Jan 2007
Posts: 7,664
IN
ahy
master
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master
Joined: Jan 2007
Posts: 7,664
IN
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Quote:
I wouldn't be adding a hood scoop, I'd be drawing from the fenderwells through the caster / camber adjust holes, with a sealed system. My current setup is pretty low budget. Its just a 14" drop base with a 3" element, which makes for a narrow pinch point inside the assembly. This coupled with the choke horn on the primary side of the carb makes for what seems like a somewhat restrictive setup that is sucking in hot air.
Sounds like most people see at least some gains, I think this mod will be in the works for the winter; along with milling the choke horn off, and maybe moving my battery to the trunk.
Thanks guys
If you move the battery you can pick up cool air from the battery vent most models have... may be easier than the adjust holes. 
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Re: How much gain from a cold air system?
[Re: schreecher]
#1130339
12/14/11 01:26 PM
12/14/11 01:26 PM
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Joined: Jan 2003
Posts: 17,904
S.E. Michigan
ZIPPY
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,904
S.E. Michigan
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I picked up 3 tenths and 3mph.
It was the most impressive low buck improvement I ever made.
Rich H.
Esse Quam Videri
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I think if you see a large gain you were probably running rich to begin with. 
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