"Safest" Lean AFR for crusing?
Thread Starter
On The Tree
iTrader: (6)
Joined: Mar 2007
Posts: 152
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From: Northwest Indiana (Highland)
"Safest" Lean AFR for crusing? Hello,
On my 98 Camaro I am trying to save a little gas on the highway and around town, so I am trying to figure out the leanest I can safely go below 2,500Rpm's.
Right now my mods are:
5.3 Ported Heads
TR220 W/ 114LSA
LS6 intake w/ ported TB
No Emissions
3,000 stall
3.73 gear.
Right now im at about 10.5:1 CR.
I was thinking something along the lines of 15.5:1 or 15.6:1 AFR.
I have HP tuners, and AM buying a LC-1 soon.
What would you guys recommend for a good "gas mileage" AFR?
Thanks
On my 98 Camaro I am trying to save a little gas on the highway and around town, so I am trying to figure out the leanest I can safely go below 2,500Rpm's.
Right now my mods are:
5.3 Ported Heads
TR220 W/ 114LSA
LS6 intake w/ ported TB
No Emissions
3,000 stall
3.73 gear.
Right now im at about 10.5:1 CR.
I was thinking something along the lines of 15.5:1 or 15.6:1 AFR.
I have HP tuners, and AM buying a LC-1 soon.
What would you guys recommend for a good "gas mileage" AFR?
Thanks
Thread Starter
On The Tree
iTrader: (6)
Joined: Mar 2007
Posts: 152
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From: Northwest Indiana (Highland)
I am using HP tuners version 1.23, and I cannot find the DCFO settings,
I think this might get me some more mileage.
Any old school HP tuner guys out there?
I think this might get me some more mileage.
Any old school HP tuner guys out there?
TECH Enthusiast
Joined: Nov 2006
Posts: 620
Likes: 0
From: Katherine N.T Australia
DFCO doesn't save anywhere near as much fuel as a good cruising AFR does. I'm running 16.13 between 1200 and 2000 below 55kpa. This is using a custom OS in EFI Live. I'm unfamiliar with HPTuners and its ability to control fuel.
TECH Enthusiast
Joined: Nov 2006
Posts: 620
Likes: 0
From: Katherine N.T Australia
Originally Posted by 2002_Z28_Six_Speed
Well, you have an Aussie car anyways.
You have to alter the ASM code to get it to work on a Camaro.
You have to alter the ASM code to get it to work on a Camaro.
Learn something every day.
If you wanted to be rough you could cheat and lower VE to get a higher AFR below 55kpa and between 1200-2000
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TECH Fanatic
Joined: Aug 2005
Posts: 1,691
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From: Sunny London, UK
Custom OS allows you to command any afr at any load point. Lean cruise on the other hand is triggered and is rpm x g/cyl rather than rpm x kpa in the custom os.
The triggers are engine on time, min and max speed plus I think a couple of others.
15.4:1 is a good idea for a nice flexible fuel level while retaining good power. 16.x:1 will get you more economy but power will be sad. So log your motorway travel and try to just single out the area where you know 70mph sits and lean that out. Leave the other load points around 15.4:1 and enrichen for full power as per normal.
I doubt many will note much difference running 15.4:1 at low load especially stock.
The triggers are engine on time, min and max speed plus I think a couple of others.
15.4:1 is a good idea for a nice flexible fuel level while retaining good power. 16.x:1 will get you more economy but power will be sad. So log your motorway travel and try to just single out the area where you know 70mph sits and lean that out. Leave the other load points around 15.4:1 and enrichen for full power as per normal.
I doubt many will note much difference running 15.4:1 at low load especially stock.
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I noticed in my testing as it approached 16.5 the power would drop off enough you were no longer saving gas but burning more. id also say don't go over 16.
just make sure you are only using lean during those very low flow rates.
just make sure you are only using lean during those very low flow rates.
Originally Posted by ringram
Custom OS allows you to command any afr at any load point. Lean cruise on the other hand is triggered and is rpm x g/cyl rather than rpm x kpa in the custom os.
The triggers are engine on time, min and max speed plus I think a couple of others.
15.4:1 is a good idea for a nice flexible fuel level while retaining good power. 16.x:1 will get you more economy but power will be sad. So log your motorway travel and try to just single out the area where you know 70mph sits and lean that out. Leave the other load points around 15.4:1 and enrichen for full power as per normal.
I doubt many will note much difference running 15.4:1 at low load especially stock.
The triggers are engine on time, min and max speed plus I think a couple of others.
15.4:1 is a good idea for a nice flexible fuel level while retaining good power. 16.x:1 will get you more economy but power will be sad. So log your motorway travel and try to just single out the area where you know 70mph sits and lean that out. Leave the other load points around 15.4:1 and enrichen for full power as per normal.
I doubt many will note much difference running 15.4:1 at low load especially stock.
