Lower restriction filter / cold air intake = better MPG?

Charles Lasitter · Apr 11, 2006

and coasting when possible ... for fuel economy
Click to expand...

This is another topic I'm interested in, so I'm starting another thread
on it.
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doug · Apr 11, 2006

Jim Yanik said:

You don't get increased power AND increased fuel economy at the same time.
Click to expand...

Well, yes, you can. But the modifcations to the engine would be much more
far reaching than a new exhaust and/or intake system.

However,having more power output at a given throttle opening,you can back
off on the throttle and use less fuel and not suffer a performance
loss(from original). With the added benefit of having more power available
when wanted.
Click to expand...

Perhaps - but why have all that extra HP if you don't use it. ;-)

IMO,driving -style- is more influential on fuel economy,gentler starts and
coasting when possible do more for fuel economy than any mods.
Sure,he could strip out excess weight like insulation,unused seats,clean
out the trunk,no spare tire,but that's impractical.(and unwise)
Click to expand...

You're absolutely correct. But when you have all that HP under your foot...

Doug

jim beam · Apr 12, 2006

Jim said:

i gun my [motor all stock] civic pretty hard, use the full rev
range, and guess what, i can drag most riced civics up to about
60. why? because i have everything adjusted perfectly, /not/
because i ponce about with a stupid air intake that i don't need.
save your money - use oem filtration and enjoy both better
mid-range performance and longer engine life.
Click to expand...

In addition to the advertising hype there are obviously different
opinions on the issue of filters and CAIs, and this exchange of views is
almost exactly what I was hoping for.

I'm really not expecting any of these mods to pay for themselves in
terms of fuel economy, and I am not interested in HP gains that are so
small they can be measured on a dyno but not felt.
Click to expand...

Honda Tuning Magazine's tests got 20 hp gains on an RSX with the CAIs,5-7
hp with short rams.I could definitely feel the gain on my GSR after the CAI
was put in. IMO,a short ram was not worth the trouble or cost.

The factory setup is almost always going to be best for the largest
number of drivers, and I appreciate your comments.

One thing I find curious is the absence of CAI listings for '05 2.4L
Accords. I was just out trying to follow the air inlet path, and it
seems to end just forward of the drivers front wheelwell.
Click to expand...

Like in my Integra,you may find that the intake curves UP into the top of
the fender and back into the engine compartment,along with a resonator tank
in that wheelwell area.The Type-R difference is that the pipe ends at the
top inside of the fender,not reentering the engine compartment.The length
of the intake piping increases low-end torque,I've read.

It's shielded, no doubt to protect against water ingestion, but it seems
that this location would normally provide it with a source for
(relatively) cold air.
Click to expand...

Not when the pipe loops back into the engine compartment.(like my Integra)

One Integra modder had a diagram of the Integra intake plumbing on their
website,and a copy of the Type-R's intake,too.
Click to expand...

intake design is a complex subject. turbulence and resonance are
*major* factors in design that i do not see addressed in the typical
"cai". if the resonance is factored right, it can redress some of the
volumetric efficiency quirks any particular motor may have. conversely,
a bigger pipe with incorrect bend design can cause more turbulent
airflow than a narrower pipe with good bend design.

bottom line, yes, some cai's can work on some cars. detroit garbage is
almost invariably advantaged. it's /not/ a given however that something
with a complex tuned induction system like a honda, that replacement
automatically means better results. otherwise every rice-kiddie's
mickey mouse civic would spank my 1.5 dpfi. they don't, much to their
annoyance. mine's old school automatic too, so it should be at a
substantial efficiency disadvantage.

L Alpert · Apr 15, 2006

Brian Smith said:

Fortunately, it's not only Honda products that have this problem.
Click to expand...

Of course, but when the term is used, no matter the original maker, the
travesty can be imagined.. ;-(

Charles Lasitter · Apr 15, 2006

Of course, but when the term is used, no matter the original maker, the
travesty can be imagined.. ;-(
Click to expand...

More advertising hype, but AEM has a product advertised for trucks that
uses a dry polyester filter and they claim a dust capture ability of as
small as a micron ...

http://tinyurl.com/p7lmh

http://tinyurl.com/oxhns
http://trucks.aempower.com/dryflow/SWRIresults_injen5inch-kn9inch-airaid9inch.pdf

http://tinyurl.com/qm2bv
http://trucks.aempower.com/dryflow/SWRIresults_9inchdryflow_coarsedust.pdf

http://tinyurl.com/ozph8
http://trucks.aempower.com/dryflow/SWRIresults_9inchdryflow_newandcleaned.pdf
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| Charles Lasitter | Mailing/Shipping |
| 401/728-1987 | 14 Cooke St |
| cl+at+ncdm+dot+com | Pawtucket RI 02860 |
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