[Diy_efi] OL operation - How lean at cruise?

[Daniel R. Nicoson]

Thanks for the feedback Hugh, I'm going to play with this issue over the
next few weeks and see what I learn.

Dan Nicoson


> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
> Behalf Of hugh at sol.co.uk
> Sent: Thursday, March 31, 2005 2:59 AM
> To: diy_efi at diy-efi.org
> Subject: RE: [Diy_efi] OL operation - How lean at cruise?
>
>
> I read on here a while back that an AFR of 16 : 1 was the most economical
> cruise mixture.
>
> I have experimented with 16 : 1 and 17 : 1 without much to choose between
> on economy.
>
> My Exhaust gas temperature creeps up to 800?C when doing about 90 MPH on
> the UK motorways at 16 : 1, so tend to run near 15 : 1 at higher cruise
> speeds.
>
> I have 280? degree duration cams with 10.8mm lift, so probably
> suffer a bit
> from overlap making the Exhaust gas temperature high.
>
> Hugh
>
>
> Original Message:
> -----------------
> From: Daniel R. Nicoson A6intruder at myo-p.com
> Date: Wed, 30 Mar 2005 10:20:25 -0500
> To: diy_efi at diy-efi.org
> Subject: [Diy_efi] OL operation - How lean at cruise?
>
>
> I'm back to tuning my 1994 Mustang GT, snow is gone, the daily driver, an
> "ultimate driving machine" isn't as reliable as this old Mustang (BMW
> currently apart in my garage awaiting parts).  So I'm driving the Mustang.
>
> I don't have a very good tune going right now, sucking lots of
> expensive gas
> ( I drive about 45 miles each day). So I decided to run Open Loop
> full time
> and try to run pretty lean at low LOAD levels (no cats to worry
> about right
> now).
>
> I'm just curious what others have found to be good AFR for highway cruise
> and around town.  I plugged in a program last night that commands about
> AFR=15.5 at these conditions.  Seems to run fairly smooth down
> the highway.
>
> My combination is a stock bottom end, AFR-165 heads, cam is really just a
> high lift version of the stocker, nothing really wild.
>
> Thanks,
>
> Dan Nicoson
>
>
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