Tweecer And Air/Fuel

[tjh566]

Ok Under the Scalars There is one called "Nominal AFR" I was under the assumtion this value what ever inputed the computer would try and target. My question is this, how does the computer know when it achives this if I set it to say 12.5, Because I thought the O2 sensors it reads off of only read rich/lean for 14.7.

Or am I understanding how to tune the AFR All wrong? Do I just need to adjust the fuel tables to my needs AND have that at my desired value or what?

 

[final5-0]

When you see all the talk about your air to fuel ratio ...........
That is all about Open Loop

When you see all the talk about O2's and adaptive strategy ...........
That is all about Closed Loop
The pcm ... NOT you ... controls the ratio here
hence
The Phrase ... Closed Loop

If by chance you are looking at LAMBSE values ......
That is NOT your af ratio

LAMBSE is the commanded ratio from the pcm at any
particular point in time and it changes due to various
sensors sending data under various driving conditions

If your concerns all stem from the af ratio .......
You need a Wide Band to accurately make adjustments

Without the WB ... you put yourself at risk by trying to change
the values in the fuel tables.

Did I help or just make you wanna ask more Q's

Grady

 

[tjh566]

I think I understand, but heres a question, I need my air/fuel ratio to be 12.5:1 for Forced Induction.. Do I just richen the fuel tables? until I hit my desired AFR, I do have a wideband.

 

[final5-0]

I think I understand, but heres a question, I need my air/fuel ratio to be 12.5:1 for Forced Induction.. Do I just richen the fuel tables? until I hit my desired AFR, I do have a wideband.

No since in typing all that stuff twice

See if this helps

http://forums.stangnet.com/showthread.php?t=685346

12.5 ain't fat enough for forced induction!!!

Grady

 

[tjh566]

oopsies for some reason I had that 12.5 in my head, just researched it agian and now I remember 11:1 is the safe number.

And my new hard drive just died. So I lost the base tune I had made up and the EEC Analzyer that I bought, and various other important e-mails

Anyways, Thanks grady always helpful as usual.

 

[final5-0]

oopsies for some reason I had that 12.5 in my head, just researched it agian and now I remember 11:1 is the safe number.

And my new hard drive just died. So I lost the base tune I had made up and the EEC Analzyer that I bought, and various other important e-mails

Anyways, Thanks grady always helpful as usual.

Don't Ya Hate It

When that happens

Here is a little tip for you

The cal file is not all that big
and
Its easy to save on a floppy or thumb drive
if
You can remember to do ... that is

Grady