Interesting SG2 observations. - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 05-06-2007, 04:08 AM   #1
Registered Member
 
Compaq888's Avatar
 
Join Date: Oct 2005
Posts: 1,460
Country: United States
Interesting SG2 observations.

My car is stick, to clear up any confusion.

My MAP reading is usually 3.9-4.1 when I'm idling at a red light in neutral with the foot on the brake. GPH is 0.2

My MAP reading is 3.6-3.9 when I am idling at a red light in neutral with no foot on any pedal. GPH is 0.2

My MAP reading is 3.6-3.9 when I'm idling at a red light in neutral with the clutch pedal pressed and no other pedal pressed. GPH is 0.2

My MAP reading is 3.5-3.3 when I'm idling at a red light with the clutch pedal pressed in and the stick into 1st gear and no other pedal pushed in. GPH bounced back and forth between 0.1-0.2

The lower the MAP and GPH reading the more gas you save. Any comments or observations you guys see?
__________________

__________________

Compaq888 is offline   Reply With Quote
Old 05-06-2007, 04:48 AM   #2
Registered Member
 
omgwtfbyobbq's Avatar
 
Join Date: Jul 2006
Posts: 1,516
Country: United States
According to wikipedia, the source of all knowledge in the known universe. MAP = BAP - Manifold Vacuum. So when you hit the brake, you're bleeding a bit of the manifold vacuum, and the MAP reading is higher than in N w/ no foot on any pedal, but since engine speed is the same, idle fuel consumption is the same. What's funny is that the clutched being pushing in w/ the car in first does something. I wonder, does engine speed change at all when the car's put into first w/ the clutch in? If Honda had the ECU drop the idle speed just a bit when first was selected, that might explain why MAP/gph drops.
__________________

__________________
Quote:
Originally Posted by FormulaTwo
I think if i could get that type of FE i would have no problem driving a dildo shaped car.
omgwtfbyobbq is offline   Reply With Quote
Old 05-06-2007, 10:06 AM   #3
Registered Member
 
Compaq888's Avatar
 
Join Date: Oct 2005
Posts: 1,460
Country: United States
Quote:
Originally Posted by omgwtfbyobbq View Post
According to wikipedia, the source of all knowledge in the known universe. MAP = BAP - Manifold Vacuum. So when you hit the brake, you're bleeding a bit of the manifold vacuum, and the MAP reading is higher than in N w/ no foot on any pedal, but since engine speed is the same, idle fuel consumption is the same. What's funny is that the clutched being pushing in w/ the car in first does something. I wonder, does engine speed change at all when the car's put into first w/ the clutch in? If Honda had the ECU drop the idle speed just a bit when first was selected, that might explain why MAP/gph drops.

The engine speed drops from 650+ to around 615~625. You guys have anymore interesting observations?
__________________

Compaq888 is offline   Reply With Quote
Old 05-06-2007, 10:15 AM   #4
Registered Member
 
JanGeo's Avatar
 
Join Date: Jan 2006
Posts: 2,442
Country: United States
Send a message via Yahoo to JanGeo
brake light loads the alternator and MAP is higher without load and or engine braking and lower with throttle - it is a vacuum measurement higher vacuum means engine is trying to take more air in than the throttle opening will allow resulting in less gas being burned. Clutch in releases the transmission input shaft load on the engine but puts a throwout bearing load on the engine and end bearing crank load.
JanGeo is offline   Reply With Quote
Old 05-06-2007, 10:19 AM   #5
Registered Member
 
omgwtfbyobbq's Avatar
 
Join Date: Jul 2006
Posts: 1,516
Country: United States
Quote:
Originally Posted by Compaq888 View Post
The engine speed drops from 650+ to around 615~625. You guys have anymore interesting observations?
That must be it then. Clutch in plus first gear results in the ECU dropping engine speed. It's kinda interesting, because it also implies that like JanGeo said, when the clutch is in and input shaft disconnected, there isn't any change in fuel consumption. So, when you're not powering anything, fuel consumption at idle seem to be directly proportional to idle speed.
__________________
Quote:
Originally Posted by FormulaTwo
I think if i could get that type of FE i would have no problem driving a dildo shaped car.
omgwtfbyobbq is offline   Reply With Quote
Old 05-06-2007, 11:15 AM   #6
Registered Member
 
Compaq888's Avatar
 
Join Date: Oct 2005
Posts: 1,460
Country: United States
now use this to your advantage.
__________________

Compaq888 is offline   Reply With Quote
Old 05-06-2007, 11:34 AM   #7
Registered Member
 
omgwtfbyobbq's Avatar
 
Join Date: Jul 2006
Posts: 1,516
Country: United States
__________________
Quote:
Originally Posted by FormulaTwo
I think if i could get that type of FE i would have no problem driving a dildo shaped car.
omgwtfbyobbq is offline   Reply With Quote
Old 05-06-2007, 12:12 PM   #8
Registered Member
 
Compaq888's Avatar
 
Join Date: Oct 2005
Posts: 1,460
Country: United States
I know a lot people on here have SG2's. You guys haven't dscovered anything?
__________________

Compaq888 is offline   Reply With Quote
Old 05-06-2007, 12:33 PM   #9
Registered Member
 
GasSavers_Red's Avatar
 
Join Date: Nov 2006
Posts: 513
Country: United States
Send a message via MSN to GasSavers_Red
Mine drinks gas no matter what I do Then again the Jeeps ECU is rather stupid
__________________

__________________
GasSavers_Red is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Any way to account for missed fuel ups? seanmnaes Fuelly Web Support and Community News 5 08-12-2008 04:48 AM
Roof Wing Spoiler? cfg83 Aerodynamics 2 03-11-2008 08:35 AM
Honda NOID Light, Which to use? 8Civic8 General Maintenance and Repair 11 10-29-2006 04:45 PM
n600 for sale lovemysan For Sale 16 10-23-2006 12:34 PM
high pitch squeak when engine bogs? budomove General Maintenance and Repair 4 07-10-2006 08:43 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 04:22 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.