08-05-2008, 05:24 PM
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#1 (permalink)
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Banned
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AutoSpeed on running lean for fuel economy
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08-05-2008, 06:27 PM
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#2 (permalink)
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EcoModding Lurker
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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.
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08-05-2008, 06:51 PM
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#3 (permalink)
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Administrator
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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.
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08-05-2008, 06:58 PM
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#4 (permalink)
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Master EcoModder
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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.
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08-05-2008, 07:24 PM
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#5 (permalink)
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Pokémoderator
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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
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08-05-2008, 11:53 PM
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#6 (permalink)
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38 time NHRA/IHRA Champ
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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!
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08-06-2008, 12:06 AM
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#7 (permalink)
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Batman Junior
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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!
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08-06-2008, 12:13 AM
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#8 (permalink)
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Master EcoModder
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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.
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08-06-2008, 12:19 AM
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#9 (permalink)
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Batman Junior
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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.
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08-06-2008, 12:34 AM
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#10 (permalink)
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Pokémoderator
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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!
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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..
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