NEVERMIND. I found some good info in a post a few threads down. Thanks for the help guys.


If I'm tuning for pure fuel savings when on the freeway/steady speeds, what a/f should I shoot for (using a wideband)? I'm assuming in the area of 16-22 in/hg, basic steady throttle cruising conditions. I'm at about 14.4-14.7ish now, but I think I've heard I can go a bit leaner and be okay.

Basically to clarify, I"m shooting for 12.5 under boost, around 13.5 under moderate/non-boosted acceleration, and ?(15.0)? for steady state cruising?

Thanks for any help guys,

Ryan P.


Modified by SJP0tato at 2:50 PM 6/25/2003


Modified by SJP0tato at 3:43 PM 6/25/2003

 

fuel economy and good power don't really go together. But havind said that, if you get a goofd A/F ratio, your car should not burn too much gas and it will run very efficiently...12.5 to 13.0 under boost would be my target.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MiraiZ &raquo;</TD></TR><TR><TD CLASS="quote">fuel economy and good power don't really go together. But havind said that, if you get a goofd A/F ratio, your car should not burn too much gas and it will run very efficiently...12.5 to 13.0 under boost would be my target.</TD></TR></TABLE>


Id have to go with what miraiz posted.

 

I think I wasn't clear enough first time around. lol I'm only concerned with the fuel economy in the cruising area of the fuel map, I'm going to be sure to run safe for acceleration and boost. I wasn't really clear when I re-read what I had posted. If anyone can help me out with what they're running for their cruising a/f ratios that'd be great.

Thanks again guys,

Ryan P.

 

bump.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SJP0tato &raquo;</TD></TR><TR><TD CLASS="quote">I think I wasn't clear enough first time around. lol I'm only concerned with the fuel economy in the cruising area of the fuel map, I'm going to be sure to run safe for acceleration and boost. I wasn't really clear when I re-read what I had posted. If anyone can help me out with what they're running for their cruising a/f ratios that'd be great.

Thanks again guys,

Ryan P.</TD></TR></TABLE>

aim for 14.0 -14.5 on the non-boost portions...I personally would not venture above 14.7, you will be running dangerously lean

 

The honda engine will very easily operate under cruising conditions with A/F ratios as lean as 15-16:1 without burning up anything.

Best thing to do is put your wideband on a stock vehicle and drive around watching what happens. I think you'd be surprised!

-Ben

 

I think from 15:1-16:1 would yield better gas mileage and still be safe as long as you are running high octane (91+). FalconGSR tuned his EMS leaner than 14.7:1 on part throttle with good results.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EFIGUY &raquo;</TD></TR><TR><TD CLASS="quote">The honda engine will very easily operate under cruising conditions with A/F ratios as lean as 15-16:1 without burning up anything.

Best thing to do is put your wideband on a stock vehicle and drive around watching what happens. I think you'd be surprised!

-Ben</TD></TR></TABLE>

You should also compensate for the fact that a boosted car runs about 10 to 15% hotter than an NA.....15:1 is nice for an econobox where the temperatures pretty much stay constant and cool, but on boosted, I would want that added insurance of not detonating due to being heat soaked...

 

At cruise I've had the GSR as lean as 17:1 without lean induced misfire. 18:1 it would usually begin to misfire.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MiraiZ &raquo;</TD></TR><TR><TD CLASS="quote">

You should also compensate for the fact that a boosted car runs about 10 to 15% hotter than an NA.....15:1 is nice for an econobox where the temperatures pretty much stay constant and cool, but on boosted, I would want that added insurance of not detonating due to being heat soaked...</TD></TR></TABLE>

At cruise there is not going to be much of a difference at all.

It's not going to ping at cruise. It might misfire.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dustin &raquo;</TD></TR><TR><TD CLASS="quote">At cruise I've had the GSR as lean as 17:1 without lean induced misfire. 18:1 it would usually begin to misfire.</TD></TR></TABLE>

whoa dude...where did you come from??? did you ever get the NS-X?

 

Oh damn I must have thought I was in GD&D

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dustin &raquo;</TD></TR><TR><TD CLASS="quote">Oh damn I must have thought I was in GD&D </TD></TR></TABLE>

Yeah...well you never answer your IMs

 

I don't receive IMs from peons.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dustin &raquo;</TD></TR><TR><TD CLASS="quote">I don't receive IMs from peons. </TD></TR></TABLE>

SMIRK ...oh so I'm a peon now

 

This might be a good place to post this info about teh EFI UNIVERSITY seminar called EFI 101
check this out

https://honda-tech.com/zerothread?id=532926

-Ben