Which intake would show most fuel efficiency gains?

[JohnnyRun]

I've been searching and searching the internet for an answer, and I haven't been able to find a clear one, so I've turned to EcoModder. Which intake system, Cold Air Intake, stock intake, or a short ram intake? I've already learned that cold air means more powerful explosions, because of the cold dense air, but would this mean, under frugal driving, that one would see fuel gains while maintaining the same (if not better) acceleration? Any information would be greatly appreciated!

[Frank Lee]

Search feature, live and be well.

[zonker]

lots of unknowns need to be answered in your search for the perfect intake, like besides an air filter, what else is attached to your intake system...
is it a straight shot to the filter or is there a resonator in the factory system?
is there any ecu related electronics mounted in the intact tract between the throttle body and air filter?
what kind of car/truck is this?

[JohnnyRun]

Its gonna be for a Honda Civic Hatchback that I haven't bought yet so I'm assuming everything will be like factory settings.

[MGB=MPG]

Cold Air Intake,,,, CAI Thought to provider a denser colder charge enhancing engine efficiency.improves available power .

Warm Air Induction.... WAI thought to improve fuel economy because of *pumping losses* ...reduces available power

stock intake, .. best of both worlds it will have a sensor that will provide WAI on start until proper operating temps are met then automatically adjust CAI & WAI as required

short ram intake? velocity stacks do you mean?? in carburetor units increases the induction speed for enhanced mixture atomization usually in racing conditions with no air filter
Ram Air Cold Induction ...RACI a cold air induction system with the induction in a high pressure area exposed to the air stream ,, the poor mans supercharger ,, increases the induction pressure by about .02 PSI @ 70 MPG , same as CAI with a wee bit [negligible] of boost.


my unit is a 1800CC if i had what i want it would be a K03 turbocharger
but until engineering development i settle for RACI, development and parts cost prohibitive . i need to do trials with the RACI and a manometer and see if the theoretical .02 PSI is seen in the airbox..

i would like the WAI crowd to provide hard data to support claims

CAI seems to be the big market choice they are every where with vendors claiming effect.


if i were you id hang with the stock system for a while until convincing hard data is presented

[zonker]

Originally Posted by JohnnyRun

Its gonna be for a Honda Civic Hatchback that I haven't bought yet so I'm assuming everything will be like factory settings.

ok, you're not helping.. WAY not enough info.

Year?
Engine size?
Transmission?

[mcrews]

really.


If you would do a search (why should we do it) of the forum, using the search function, you would see documented and tested results.

all that cold air crap is well crap. Cold air does not improve FE. Oh, and I can say that because I have used the search function to find the answers.

There is plenty of test results for the warm air. again search.

[MGB=MPG]

searched... all i found was one proved no effect
wiki has no documented test results
show me

http://ecomodder.com/wiki/index.php/Warm_air_intake

no documented results

http://www.metrompg.com/posts/wai-test.htm



Observations & conclusions

The grain of salt: the margin of error for the CAI group is +/-0.17 km/gal; for the WAI group it's +/-0.42 km/gal.

For this car, under these specific test conditions, the difference between the WAI and CAI averages is so small as to be statistically insignificant. (And even if it was statistically significant, practically speaking there's no difference between 79.12 and 79.31 km/gal

Which intake would show most fuel efficiency gains?

Run with Cold:

1. 38.5
2. 36.5
3. 36.4
4. 37.1
5. 35.6
6. 36.0

Average: 36.68

Run with Hot:

1. 37.0
2. 36.8
3. 37.0
4. 34.8
5. 36.4
6. 35.1

Average: 36.18



A .5 mpg decrease overall at 45 mph. While this would be acceptable if there was another benefit, there isn't. The power is NOTICEABLY gone from the engine. With the hot air intake, its choked.
................


i guess i was wrong heres 2 tests not carried over to the wiki both say WAI ineffective

[PaleMelanesian]

If there's no documented increase to a CAI, why spend the money? If you don't have one already, spend the money on a Scangauge. It will do FAR more for your mileage.

I'm doing just fine with my Civic and the stock intake.

[UFO]

Originally Posted by PaleMelanesian

If there's no documented increase to a CAI, why spend the money? If you don't have one already, spend the money on a Scangauge. It will do FAR more for your mileage.

I'm doing just fine with my Civic and the stock intake.

Best advice yet, bottom line.