sealing front of air box w/ CAI?
03-24-2004, 03:28 AM
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sealing front of air box w/ CAI? just recently noticed the lower front of my air box is not sealed off (rubber gasket) and if i remamber right back when we installed the slp cold air induction duct the directions said to close it off with a supplied gasket (?) , called slp last week and they said it works either way (?) should i seal it off to get full benifit of the cai or is having 2 air supplies a good idea? thanks
03-24-2004, 10:55 AM
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If you have an SS hood, the air that delivers will
be substantially cooler than the SLP CAI. I have
checked this on my car, the CAI with its stainless
construction up against the radiator warms the
air substantially (about 10 degrees hotter than my
SS hood alone) at lower airflows. It stays hot for
a fair while too even after you start rolling, heat-
soaks like a bitch when parked. I ended up totally
hacking mine so it draws from the nose "dead space"
instead (with corresponding hackage to the two
"nostrils" to relieve the air path there and provide
a less restricted nose-space cold air source).
Since it's just sticking into the radiator air pocket
there is no "ram air" intake pressurization of any
consequence. You will lose nothing by having the
SS hood duct active as well, and marginally improve
the IAT readings on balance (relative to CAI with
the SS ducts blocked; the SS air alone is cooler).
SLP's pseudoscience babble notwithstanding, it's only
a duct from one place to another that (you wish) is
lower-temperature. And two skinny slots are better
than one, from a simply-airflow perspective, which is
why I kept & hacked rather than just ditching the
whole apparatus when I found its IAT effect to be
a negative.
On a Z/28 blocking the slot off might (or not) keep
engine compartment air from the filter. I don't have
one so couldn't say about that.
be substantially cooler than the SLP CAI. I have
checked this on my car, the CAI with its stainless
construction up against the radiator warms the
air substantially (about 10 degrees hotter than my
SS hood alone) at lower airflows. It stays hot for
a fair while too even after you start rolling, heat-
soaks like a bitch when parked. I ended up totally
hacking mine so it draws from the nose "dead space"
instead (with corresponding hackage to the two
"nostrils" to relieve the air path there and provide
a less restricted nose-space cold air source).
Since it's just sticking into the radiator air pocket
there is no "ram air" intake pressurization of any
consequence. You will lose nothing by having the
SS hood duct active as well, and marginally improve
the IAT readings on balance (relative to CAI with
the SS ducts blocked; the SS air alone is cooler).
SLP's pseudoscience babble notwithstanding, it's only
a duct from one place to another that (you wish) is
lower-temperature. And two skinny slots are better
than one, from a simply-airflow perspective, which is
why I kept & hacked rather than just ditching the
whole apparatus when I found its IAT effect to be
a negative.
On a Z/28 blocking the slot off might (or not) keep
engine compartment air from the filter. I don't have
one so couldn't say about that.