08-05-2008, 05:24 PM
|
#1 (permalink)
|
Banned
Join Date: Aug 2008
Location: Australia
Posts: 43
Thanks: 0
Thanked 6 Times in 2 Posts
|
AutoSpeed on running lean for fuel economy
|
|
|
Today
|
|
|
Other popular topics in this forum...
|
|
|
08-05-2008, 06:27 PM
|
#2 (permalink)
|
EcoModding Lurker
Join Date: Jul 2008
Location: Auckland, New Zealand
Posts: 34
Thanks: 0
Thanked 0 Times in 0 Posts
|
I am attempting this on a mechanical injected diesel so I have full control.
It is possible to achieve the results Autospeed couldn't if you have an aftermarket ecu (Power FC, etc), to reduce the "global" injector value.
I used to run the injector values 15% low, and advance the timing 5° on my turbo S13 when cruising to events, and the economy was definitely improved.
I think you guys are already running lean if you have a WAI though? - which costs next to nothing vs $1000's for an ECU to tweak things.
__________________
|
|
|
08-05-2008, 06:51 PM
|
#3 (permalink)
|
Administrator
Join Date: Dec 2007
Location: Germantown, WI
Posts: 11,203
Thanks: 2,501
Thanked 2,587 Times in 1,554 Posts
|
Good article as usual Julian. I like how you explained the open/closed loops and their variance between engines.
I was a bit concerned that you didn't further emphasise the implications of increasing NOx emissions though. Its some nasty stuff.
|
|
|
08-05-2008, 06:58 PM
|
#4 (permalink)
|
Master EcoModder
Join Date: Jan 2008
Location: Mirabel, QC
Posts: 1,672
Thanks: 35
Thanked 86 Times in 57 Posts
|
Hey Julian!
It's great to have you here. I'm a big autospeed fan, and so are many other members here. Keep up the good work.
The article was interesting and well written. I would have liked to see you tackle broadband sensors as they are more of a challenge, and apply to most recent cars. Maybe for a part 2 someday.
|
|
|
08-05-2008, 07:24 PM
|
#5 (permalink)
|
Pokémoderator
Join Date: Dec 2007
Location: Southern California
Posts: 5,864
Thanks: 439
Thanked 532 Times in 358 Posts
|
Julian Edgar -
Welcome to EM! I am going to print out this article for reference. It touches all the A/F issues I am concerned with.
EDIT PS : I have the digital A/F meter from Jaycar. I love it!
CarloSW2
|
|
|
08-05-2008, 11:53 PM
|
#6 (permalink)
|
38 time NHRA/IHRA Champ
Join Date: Jul 2008
Location: Fishers, IN
Posts: 305
Thanks: 1
Thanked 10 Times in 8 Posts
|
If you plan to run a leaner set up you should first get a EGT gauge.....it is VERY easy to melt pistons while driving at "safe" speeds while driving too lean. Been there.....did that! Melted pistons while driving at just under 80 mph!
__________________
42 time NHRA/IHRA drag race champ
05 SRT4-12.17@117 mph on DOTs-31.0 mpg-SOLD
96 Geo Metro-3 banger-60.1 mpg-SOLD
95 BMW M3-13.41 @ 106 mph-31mpg-SOLD
77 Chevy Monza with 350/350-FOR SALE
84 Horizon-1880 lbs-29 mpg
95 Neon-43 mpg
99 Z28-10.80 @ 127 mph-27.1mpg
2011 Prius-62.1 wife's
|
|
|
08-06-2008, 12:06 AM
|
#7 (permalink)
|
Batman Junior
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,527
Thanks: 4,078
Thanked 6,976 Times in 3,612 Posts
|
OK, that's the first I've heard of someone actually doing damage from running too lean. I'd read it was possible, but there you go!
|
|
|
08-06-2008, 12:13 AM
|
#8 (permalink)
|
Master EcoModder
Join Date: Jun 2008
Location: Northwest Lower Michigan
Posts: 1,006
Thanks: 8
Thanked 17 Times in 16 Posts
|
A buddy from the a-body board has done the same thing, melted pistons from leaning it out too much. I tried leaning out mine before with an O2 signal modifier. It certainly leaned it out, but it also got absolutely horrid mileage. Like 26 highway when I would get 32 any other time.
__________________
Winter daily driver, parked most days right now
Summer daily driver
|
|
|
08-06-2008, 12:19 AM
|
#9 (permalink)
|
Batman Junior
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,527
Thanks: 4,078
Thanked 6,976 Times in 3,612 Posts
|
This is too funny. 30 minutes ago I duplicate-posted a thread with the announcement & link to this AutoSpeed article (I've just merged the threads), and then sent a message to Julian inviting him to register so he could give a heads-up to EM members when there are new efficiency articles to check out on his site.
I see I was several hours late on both counts!
Welcome to EcoModder.
|
|
|
08-06-2008, 12:34 AM
|
#10 (permalink)
|
Pokémoderator
Join Date: Dec 2007
Location: Southern California
Posts: 5,864
Thanks: 439
Thanked 532 Times in 358 Posts
|
ATaylorRacing -
Quote:
Originally Posted by ATaylorRacing
If you plan to run a leaner set up you should first get a EGT gauge.....it is VERY easy to melt pistons while driving at "safe" speeds while driving too lean. Been there.....did that! Melted pistons while driving at just under 80 mph!
|
What A/F ratio were you running? What car, curb weight, and engine/displacement? How long was the car running at 80 MPH?
(Apologies for the 5th degree, I've been watching too much Law and Order)
CarloSW2
Last edited by cfg83; 08-06-2008 at 04:10 AM..
|
|
|
|