how do i change the air fuel ratio in tuner cat at idle and wot?and how do i increase air fuel ratio in open loop mode?also i have svo type 24lbs injectors do i need to change the injector off set constants?

 

Here is a couple of real good links!

http://para.noid.org/~lj/
http://members.aol.com/InjuneerZZ/

 

In a closed loop idle you really don't have much control over it. The computer is trying to maintain a 14.7:1 a/f ratio. Unless there is something mechanically wrong with your car that is keeping the computer from being able to adjust by itself, you should be fine.

PE tables

Not sure you can.

 

First off, why would you want to change the AFR at idle? Your signaure indicates you are running a LT4 Hotcam, normally with that cam there isn't too many tuning issues with it at all.

You can change the WOT AFR by going to your PE vs RPM tables and add or subtract fuel there.

As for changing the open loop AFR you can also do that in the Open loop AFR tables. Thats basically for cold start and control before the system runs in closed loop, any changes there should be small changes because you can affect your cold start and also open loop drivability.

Normally if you change to 24lb SVO injectors there is no need to change the offsets. I would install them, program in the new injector size constant and run it. Check your fuel trims to see where they are and then adjust it if you need to.

 

You can change the WOT AFR by going to your PE vs RPM tables and add or subtract fuel there. is that the same as the vol eff V.S rpm V.S map(ext) and I was reading on tuning the lt1 page @ w3.one.net/~roz/cars/z28/tuning.html it says if your using ford svo/bosch you want to multiple the injector offset constants by 1.4 across the table (adding 40%) to all entries this allows for the different speed at which this style injector reacts to the cars voltage----did'nt want to do this until i got a few opinions from every one just curious does this mean the injector offset Vs battery voltage or the low pulse width offset injector adder Vs BPW?

 

Hi,

I have new 30# redtop SVO injectors and raising the injector offset vs. battery voltage, which is what the website is talking about, only makes the calculated fuel pulse rich. I do not know if this is only true of newer SVO's or not. It is better to only change the injector constant first to reflect the difference in rated pressure. I have my 30's now at 31.48 to try to keep every blm 129 or less although I started at about 31.68. When I experimented with raising the offsets I had to put 33.33 for the constant because it wanted to spray so much fuel.

 

You can change the WOT AFR by going to your PE vs RPM tables and add or subtract fuel there.---------- is that the same as the vol eff V.S rpm V.S map ? what is the PE table in tunercat ?