Go Back   EcoModder Forum > EcoModding > EcoModding Central
Register Now
 Register Now

Now available from EcoModder: ScanGauge II fuel economy gauge.  Click for details.  

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 12-28-2012, 09:27 PM   #1 (permalink)
Iam not green just cheap.
 
Join Date: Dec 2012
Location: prosser WA
Posts: 7

1998 ex honda civic black - '98 Honda Civic ex
Team Honda
90 day: 37.82 mpg (US)
Thanks: 9
Thanked 0 Times in 0 Posts
less air intake

would less air going into the air intake help on mpg?

  Reply With Quote
Old 12-28-2012, 09:46 PM   #2 (permalink)
ron
Master EcoModder
 
Join Date: Nov 2011
Location: slo county ca.
Posts: 277

double eagles - '99 Dodge ram slt
Team Cummins
90 day: 19.48 mpg (US)
Thanks: 24
Thanked 17 Times in 16 Posts
your engine is a positive displacement pump the slower it turns the better your fuel consumption should be, so I would say yes.
  Reply With Quote
The Following User Says Thank You to ron For This Useful Post:
Daniel8171986 (12-28-2012)
Old 12-28-2012, 09:50 PM   #3 (permalink)
Master EcoModder
 
RobertISaar's Avatar
 
Join Date: Jul 2012
Location: camden, MI
Posts: 288

MC SBX - '95 Chevrolet Monte Carlo LS
Last 3: 29.75 mpg (US)
Thanks: 4
Thanked 38 Times in 31 Posts
couple of things to consider:

how is your ECM measuring airflow? MAF or speed-density?

if you alter the VE via intake changes so that less air is entering the engine for a given RPM and manifold pressure, the MAF system will adapt, since it only measures airmass, but a speed-density engine would actually run richer due to the ECM thinking more air is entering the engine than reality. the O2 sensor will allow for it to adapt eventually, but until then, you'll actually lose fuel efficiency.
__________________
  Reply With Quote
The Following User Says Thank You to RobertISaar For This Useful Post:
Daniel8171986 (12-28-2012)
Old 12-28-2012, 10:15 PM   #4 (permalink)
Iam not green just cheap.
 
Join Date: Dec 2012
Location: prosser WA
Posts: 7

1998 ex honda civic black - '98 Honda Civic ex
Team Honda
90 day: 37.82 mpg (US)
Thanks: 9
Thanked 0 Times in 0 Posts
what if its a honda d16y8. they use a map sensor?
  Reply With Quote
Old 12-28-2012, 10:56 PM   #5 (permalink)
herp derp Apprentice
 
Join Date: Oct 2008
Location: Lafayette, IN
Posts: 517

saturn - '99 saturn sc1
90 day: 30.63 mpg (US)
Thanks: 17
Thanked 88 Times in 69 Posts
Seems like the same affect as using less throttle, how would this be different?
  Reply With Quote
The Following User Says Thank You to 2000mc For This Useful Post:
Daniel8171986 (12-28-2012)
Old 12-28-2012, 11:06 PM   #6 (permalink)
Iam not green just cheap.
 
Join Date: Dec 2012
Location: prosser WA
Posts: 7

1998 ex honda civic black - '98 Honda Civic ex
Team Honda
90 day: 37.82 mpg (US)
Thanks: 9
Thanked 0 Times in 0 Posts
okay thanks. ill try and see what happends.
  Reply With Quote
Old 12-29-2012, 12:56 AM   #7 (permalink)
Master EcoModder
 
mechman600's Avatar
 
Join Date: Jul 2008
Location: Surrey, BC
Posts: 1,128

The eBooger - '92 Mazda MX3 EV Conversion
90 day: 71.7 mpg (US)

The Matrix - '07 Toyota Matrix XR Auto
90 day: 27.52 mpg (US)

Wee - '06 Suzuki DL650 VStrom
90 day: 50.35 mpg (US)
Thanks: 165
Thanked 238 Times in 145 Posts
A quick Ecomodder search:
Air Intake Restrictor with A-B test
  Reply With Quote
Old 12-29-2012, 03:46 AM   #8 (permalink)
Master EcoModder
 
vskid3's Avatar
 
Join Date: Jun 2008
Location: Texas
Posts: 353

Civic DX - '97 Honda Civic DX
90 day: 34.15 mpg (US)

GTO - '04 Pontiac GTO
90 day: 22.62 mpg (US)

Green Brick - '06 Ford Escape Hybrid
90 day: 31.93 mpg (US)
Thanks: 19
Thanked 41 Times in 38 Posts
Quote:
Originally Posted by mechman600 View Post
A quick Ecomodder search:
Air Intake Restrictor with A-B test
Frank sums it up quite well in that thread:
Quote:
Originally Posted by Frank Lee View Post
My gut tells me to feed it.

But it always says that. If I listen closer it also tells me that the throttle plate takes care of ALL the engine's intake restriction needs... and it's fully adjustable too!
Less air going in the engine will help, but you can do that with the throttle.
__________________
  Reply With Quote
The Following User Says Thank You to vskid3 For This Useful Post:
Daniel8171986 (12-29-2012)
Old 12-29-2012, 04:10 AM   #9 (permalink)
EcoModding Lurker
 
Join Date: Aug 2009
Location: Hamburg, New York
Posts: 95

Samantha - '94 Ford Ranger XL
90 day: 20.79 mpg (US)

Cassidy - '12 Chevrolet Silverado W/T 4x4
90 day: 15.47 mpg (US)
Thanks: 3
Thanked 6 Times in 5 Posts
Quote:
Originally Posted by RobertISaar View Post
couple of things to consider:

how is your ECM measuring airflow? MAF or speed-density?

if you alter the VE via intake changes so that less air is entering the engine for a given RPM and manifold pressure, the MAF system will adapt, since it only measures airmass, but a speed-density engine would actually run richer due to the ECM thinking more air is entering the engine than reality. the O2 sensor will allow for it to adapt eventually, but until then, you'll actually lose fuel efficiency.
That seems completely logical to me. Wonder if it would be worth running a larger intake to lean the mix out a little?
  Reply With Quote
Old 12-29-2012, 04:15 AM   #10 (permalink)
Master EcoModder
 
RobertISaar's Avatar
 
Join Date: Jul 2012
Location: camden, MI
Posts: 288

MC SBX - '95 Chevrolet Monte Carlo LS
Last 3: 29.75 mpg (US)
Thanks: 4
Thanked 38 Times in 31 Posts
keep in mind, i'm referring to being able to effectively change the volumetric efficiency of the engine.... changing anything upstream of the throttle usually won't qualify/have enough of an effect. sure, you could (for example) suck hotter air and have the air be less dense, but air temp is also factored into both speed-density and MAF.

__________________
  Reply With Quote
Reply  Post New Thread

Thread Tools





Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com