Question to the self-mapper among us: AFR target ?

[Uzelac]

??????

[jondee86]

I think you would want to be a bit richer on full boost... 12:1 or
maybe even 11.5:1 @ 1 bar.

Cheers... jondee86

[Uzelac]

I went for:



And this is the result according to LC-1





12 or lower sounds too much for NA. That's ok for Turbo.

[jondee86]

I am not familiar with the program CROME. But looking at the graph,
it seems that columns 1 - 5 are vacuum, and TP6 - TP10 are boost ??

If this is so, and you are considering only NA, then only the columns
1 - 5 are available for your selection. And of course if you are considering
only NA, then 12.7:1 or close would be fine for max rpm/load.

Cheers... jondee86

[Uzelac]

This is NA, no turbo, no boost

Horizontal line is engine load.
ECU is set to use MAP under 25% of TPS and after that TPS.
So, columns 1-5 are MAP readings, and 6-10 are TPS.

Vertical is engine speed, of course.

[r.hellenbrand]

Hi,

Normally you should run your engine with lambda 0.90, this is the best value for performance.
But for sure you can only check it on a dyno.
Mine engine needed lambda 0.87 under full load.

When you have a cat you should map lambda 1.00 (in part load).
The reason for this is that the cat only works in a small range around lambda 1.00

A simple rule:
For performance you need lambda 0.90 and for economics you should map lambda 1.10.
Full load, best performance between 0.90 – 0.88.

I hope this helps.

Ron

[Ivan141]

You can run pretty lean in low load cruise conditions... saves a bunch of fuel.
Somehow I doubt anyone here would ever try that though.
A Prius for instance runs 1:17 under such conditions if I remember correctly.....

[XJS]

Is there any EGT info? Just installed an EGT meter (leftover from a previous project) and under light city driving conditions (40-60km/h under 3k rpm in 5th) it shows 350-450 celsius, on the motorway it shows around 600-650 3500-4000rpm up to 130km/h. Are these values normal? The engine is stock bigport map close to it's end of life.

[jondee86]

Uzelac Wrote:Horizontal line is engine load.
ECU is set to use MAP under 25% of TPS and after that TPS.
So, columns 1-5 are MAP readings, and 6-10 are TPS.

Ahhh... now I understand Nice way to get MAP/TPS blend.

Cheers... jondee86

[Uzelac]

Ivan141 Wrote:You can run pretty lean in low load cruise conditions... saves a bunch of fuel.
Somehow I doubt anyone here would ever try that though.
A Prius for instance runs 1:17 under such conditions if I remember correctly.....

No worries, will try, as soon as i get EGT sensor