who's using fuel trim controllers? - Fuelly Forums

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

Reply
 
Thread Tools Display Modes
 
Old 10-04-2007, 07:15 PM   #1
Registered Member
 
Join Date: Jun 2007
Posts: 6
Country: United States
who's using fuel trim controllers?

i'm talking about things like an like an AFC or map-ecu or HKS fcon, greddy e-manage, etc. one of these things plus a wideband o2 sensor could go a long way. when i get in my other car we use these things for more HP. but it all boils down to efficiency. i see no reason we can't use these things for improved fuel economy.
__________________

jiggersplat is offline   Reply With Quote
Old 10-04-2007, 08:52 PM   #2
Supporting Member
 
lovemysan's Avatar
 
Join Date: Jun 2006
Posts: 595
Country: United States
Well there are few guys running custom chipped hondas. "DRW" is running a custom chip in a DSM. "Coyotex" is running some type of wide band and a megasquirt I think. Lastly there are a few guys running an EFIE or something like it.

Thats all I know of.
__________________

__________________
02 Saturn SL
5 speed
for pics click the link below

http://s75.photobucket.com/albums/i3...emysan/saturn/

[SIGPIC][/SIGPIC]
"for best mileage swap in a d15z1"
lovemysan is offline   Reply With Quote
Old 10-04-2007, 08:54 PM   #3
*shrug*
 
Join Date: Sep 2005
Posts: 6,195
Country: United States
My CRX is chipped,
SVOboy is offline   Reply With Quote
Old 10-05-2007, 06:05 AM   #4
Registered Member
 
Join Date: Jun 2007
Posts: 6
Country: United States
my problem with the EFIE's and the IAT resistors is that they change the fuel curve across the board. i really only want to lean it out at low RPM and low TPS.

the other thing is, how do the fuel trim computers work if the ECU tries to compensate for AFR readings it is not expecting? suppose i do manage to lean it out, the ECU is going to see that it is lean and start adjusting the long term fuel trim eventually zeroing out the piggyback fuel controller.
jiggersplat is offline   Reply With Quote
Old 10-05-2007, 09:03 AM   #5
Supporting Member
 
lovemysan's Avatar
 
Join Date: Jun 2006
Posts: 595
Country: United States
Well I would think that the EFIE would not change the fuel curve for WOT because most cars would go into open loop thus negating the input of the O2 sensor. This is kind of an untested ground for gassavers because its difficult to get a decent return on your investment. There are cheaper ways to get the same mileage.
__________________
02 Saturn SL
5 speed
for pics click the link below

http://s75.photobucket.com/albums/i3...emysan/saturn/

[SIGPIC][/SIGPIC]
"for best mileage swap in a d15z1"
lovemysan is offline   Reply With Quote
Old 10-05-2007, 10:25 AM   #6
Registered Member
 
GasSavers_Rotareneg's Avatar
 
Join Date: Jun 2007
Posts: 18
Country: United States
At WOT the computer calculates the required fuel delivery using IAT and airflow, which is why adding to or bypassing the IAT resistance changes WOT mixture.
__________________
GasSavers_Rotareneg is offline   Reply With Quote
Old 10-05-2007, 01:00 PM   #7
Supporting Member
 
cfg83's Avatar
 
Join Date: Sep 2006
Posts: 1,779
Country: United States
lovemysan -

Quote:
Originally Posted by lovemysan View Post
Well I would think that the EFIE would not change the fuel curve for WOT because most cars would go into open loop thus negating the input of the O2 sensor. This is kind of an untested ground for gassavers because its difficult to get a decent return on your investment. There are cheaper ways to get the same mileage.
I am assuming that you mean EFIE when you are talking about ROI. They seem to start at $50+, so I think they have decent ROI.

The fuel trim controllers are harder to justify because they seem to run $200+. But since they are geared for performance, they are like a 2 for 1.

jiggersplat -

I have my own plan for my EFIE. Right now it is on a switch. When I go over 25 TPS on my Scangauge, I turn it off. What I want to do is make it so that there is a relay that uses the TPS voltage to *automatically* turn off the EFIE when the throttle is greater than 25 TPS. That way, the car won't run lean when I need the power.

CarloSW2
__________________
Old School SW2 EPA ... New School Civic EPA :

What's your EPA MPG? http://www.fueleconomy.gov/feg/calculatorSelectYear.jsp
cfg83 is offline   Reply With Quote
Old 10-05-2007, 07:03 PM   #8
Registered Member
 
Join Date: Jun 2007
Posts: 6
Country: United States
that is an interesting idea. if i understand correctly, the EFIE tricks the car into thinking it's running richer than it really is by adding voltage to the o2 sensor signal. the cars ECU then compensates by setting the long-term and short-term trims. the only thing i would be concerned about is your car's ECU setting long-term and short-term fuel trims and not adapting fast enough when you switch it off. perhaps i don't know enough about how modern ECUs calculate fuel requirements.

can anyone link me to a post with some quantified results from using the EFIEs?
jiggersplat is offline   Reply With Quote
Old 10-06-2007, 01:34 AM   #9
Supporting Member
 
cfg83's Avatar
 
Join Date: Sep 2006
Posts: 1,779
Country: United States
jiggersplat -

Quote:
Originally Posted by jiggersplat View Post
that is an interesting idea. if i understand correctly, the EFIE tricks the car into thinking it's running richer than it really is by adding voltage to the o2 sensor signal. the cars ECU then compensates by setting the long-term and short-term trims. the only thing i would be concerned about is your car's ECU setting long-term and short-term fuel trims and not adapting fast enough when you switch it off. perhaps i don't know enough about how modern ECUs calculate fuel requirements.

can anyone link me to a post with some quantified results from using the EFIEs?
I've got one running now, with my own non-professional musings on what I am seeing :

Eagle Research EFIE Online ...
http://www.gassavers.org/showthread.php?t=5036

I made a youtube of the digital A/F ratio responding. What I *really* need to do is make a longer youtube of the same, but in a context that is not just idling in a parking lot.

In terms of hard numbers, I'm sorry to say that I can't provide them (very not cool!). This is one reason why I really need to get the elmscan. If I can datalog the fuel trim and 02 sensor reading (not available on my Scangauge I), then I will be in a position to provide those numbers.

CarloSW2
__________________

__________________
Old School SW2 EPA ... New School Civic EPA :

What's your EPA MPG? http://www.fueleconomy.gov/feg/calculatorSelectYear.jsp
cfg83 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
Incorrect Milage Calcuatlion PatM Fuelly Web Support and Community News 4 07-17-2009 08:21 PM
Missing Fuelup jmonty Fuelly Web Support and Community News 3 05-27-2009 05:10 AM
What is this stat? cavale Fuelly Web Support and Community News 1 09-03-2008 08:23 AM
total fuel cost for fill-up instead of price per gallon EmptyH Fuelly Web Support and Community News 1 08-26-2008 12:14 PM
"active" aero grille slats on 06 civic concept MetroMPG General Fuel Topics 21 01-03-2006 01:02 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 08:38 PM.


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