TuneECU -- HOW TO

I am sure this question has been asked and answered but the search function on the forum "lets say it is not the greatest"

If you are trying to enrich the mixture, would you crank up the "F Trim" or adjust the AF table?

and if the answer is to adjust the "F trim", why doing so does not change the values of the AF table "naturally it should"?

Thanks in advance
 
Use the F table and pretend the AF table doesn't exist, leave it alone.

For not wanting to type a long explanation, because that's what works best.
 
Rob_The_Builder said:
@Claviger Thank you,

That sounds consistent with what everyone says here and on other forums. I was just curious for obvious reasons.
Click to expand...
Basically the F table is a measurement of air quantity in the cylinder so if you raise or lower the trim in the F table or tell the ecu it is getting more ore less air it uses the air fuel ratio set for that cell to calculate how much fuel to use. It's like using toil compensation to lie to the computer so your final dimension (in this case air fuel ratio) is correct.
 
@warp9.9
warp9.9 said:
Basically the F table is a measurement of air quantity in the cylinder so if you raise or lower the trim in the F table or tell the ecu it is getting more ore less air it uses the air fuel ratio set for that cell to calculate how much fuel to use. It's like using toil compensation to lie to the computer so your final dimension (in this case air fuel ratio) is correct.
Click to expand...

Thank you.

That does make sense. However; would that mean that the compression will go up in the cylinder (also better performance)?

Again I know you are correct based on my own experience (engine was popping on deceleration after installing exhaust mods and after a 5% adjustment it is not)
 
Two separate events.

The actual cylinder pressure is higher if you add more air, there's more packed into the cylinder, so more pressure = more power.

All things being equal, if you make a change, and it's running leaner because now more air is being ingested on each intake event, you will increase power if you adjust to compensate. More air = more power :)

The compression ratio of course stays the same, its just compressing more air.

The exhuast pop, it can result from either too lean or too rich, either or. There are a couple threads here on the forums with more information. It's neither good or bad for your engine. If it bothers you, tune it out, if it doesn't leave it. A perfectly tuned perfectly running motorcycle will pop on deceleration to some degree.
 
Rob_The_Builder said:
@warp9.9


Thank you.

That does make sense. However; would that mean that the compression will go up in the cylinder (also better performance)?

Again I know you are correct based on my own experience (engine was popping on deceleration after installing exhaust mods and after a 5% adjustment it is not)
Click to expand...
No compression does not what your doing is lying to the ecu telling it there is more air so it adjust the fuel based on the lie you told it.
 

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