[cn555ic]

I had to pick up some stuff for the Superbowl party at my friend's house so I decided to log a run Everything looks good but I want to know what you guys think of my fuel trims as I am not too familiar with what to look for? 100% meth and I did not use nitrous on this run.

Who said PPS kits suck!!! Lol. Looks good to me

[Jeff@TopGearSolutions]

As long as your fuel trims dont exceed 34 you are safe.

[cwn23]

Nice logs

[stratos_335]

One of my fuel trims (bank 1) reaches 30-32 and the other drops to 0.

Shiv claims that it is because of poor meth distribution from bank 1 to bank 2. And tha with OL fueling to 100.

Anyway, some more clarification from Shiv regarding fuel trims will be very useful. A lot of people here have a lot of questions

[cn555ic]

Thanks Jeff. I have been hearing a lot of people maxing out their fuel trims at 30+ Does it mean that my car's fuel system is more efficient than others who are maxing fuel trims and mine seeing max at 22-23?

[cn555ic]

Originally Posted by stratos_335

One of my fuel trims (bank 1) reaches 30-32 and the other drops to 0.

Shiv claims that it is because of poor meth distribution from bank 1 to bank 2. And tha with OL fueling to 100.

Anyway, some more clarification from Shiv regarding fuel trims will be very useful. A lot of people here have a lot of questions

Maybe one of your o2 sensors are faulty to have such a difference in values. My meth nozzles are m10 and one M7 which both are installed at the elbow and both using only one pump so atomization is not the best and my values show its efficient enough from the fuel trims logged, so that theory goes out the door.

[Jeff@TopGearSolutions]

I'm not too familiar as there are a lot of unknowns and exterior factors. My gut feeling says you are spraying a good portion of meth which helps aid in hitting fuel trims, as you know meth is a fuel.

In case anyone is unfamiliar with the concept this is the cars way of adding fuel to hit target, so there are many factors which come into play here.

As far as variances I would possibly lead that to o2 failure myself but I'm really just not sure.

I currently spray an M7 and M5 nozzle.

[stratos_335]

Originally Posted by cn555ic

Both fuel trim banks have logged the same values. Maybe one of your o2 sensors are faulty to have such a difference in values. My meth nozzles are m10 and one M7 which both are installed at the elbow and both using only one pump so atomization is not the best and my values show its efficient enough from the fuel trims, so that theory goes out the door.

I've thought of that. But which O2 sensor, the first one or the second?

I've installed my M10 nozzle at the elbow (actually there is no elbow, I added a meth bang on my Synapse chargepipe where an elbow should be).

An O2 sensor would require a lot of money and effort to change. How could I know if an O2 sensor is damaged?

[cn555ic]

I think fuel trims are directly linked to the wideband 02 sensors located at the front of the Dps, and the rear ones are narrow bands 02 sensors from what I read. Are your a/f readings erratic also?

[cn555ic]

Originally Posted by Jeff@topgearsolutions

I'm not too familiar as there are a lot of unknowns and exterior factors. My gut feeling says you are spraying a good portion of meth which helps aid in hitting fuel trims, as you know meth is a fuel.

In case anyone is unfamiliar with the concept this is the cars way of adding fuel to hit target, so there are many factors which come into play here.

As far as variances I would possibly lead that to o2 failure myself but I'm really just not sure.

I currently spray an M7 and M5 nozzle.

Thanks for the response, I hope those who are really familiar with this can chime in to let me know what they see in my logs.

[stratos_335]

Originally Posted by cn555ic

I think fuel trims are directly linked to the wideband 02 sensors located at the front of the Dps, and the rear ones are narrow bands 02 sensors from what I read. Are your a/f readings erratic also?

Nothing serious, but sometimes there is some afr fluctuation and a small difference between bank 1 and 2, 11.5 for bank1 1 and 12 for bank 2.

And here is the log:



Yes, I think that the first O2 sensor does all the hard work.


And really, what is the meaning of the fuel trims? Hight trims mean that injectors work on higher duty cycle to reach afrs? My car pulls really hard and I'm very satisfied with that. I just don't want to cause any injector failure for the health of my engine.

I've read somewhere that the range should be somewhere between 20 and 30. I don't know what negative values stand for

[cn555ic]

I wonder if DME software versions play a role in fuel trims as such. I am still on the original software version 27.xx. Your A/F look normal and small fluctuations like .5 variance is not a big deal. I usually never log fuel trims and lately there has so much talk about Fuel trims that I logged it just to see how mine are. I just need to experts to tell me what they see. I don't know what's going on with your readings from bank 1 to bank 2.

[stratos_335]

Originally Posted by cn555ic

I wonder if DME software versions play a role in fuel trims as such. I am still on the original software version 27.xx. Your A/F look normal and small fluctuations like .5 variance is not a big deal. I usually never log fuel trims and lately there has so much talk about Fuel trims that I logged it just to see how mine are. I just need to experts to tell me what they see. I don't know what's going on with your readings from bank 1 to bank 2.

+1 to this

[enrita]

you should plot both banks trims OP. bank 1 looks fine. you should keep them positive around 10-20. I had big variance as well between banks but not as much as stratos. Means 1 bank gets loads of meth while the other not that much.
where is/are your nozzle placed?
Basically you dont want them negative since you are removing fuel from the injectors but not maxed out as well.
If you up the meth content you add more fuel so the trims should go more negative while if you put more water they should go more positive.

[cn555ic]

Originally Posted by enrita

you should plot both banks trims OP. bank 1 looks fine. you should keep them positive around 10-20. I had big variance as well between banks but not as much as stratos. Means 1 bank gets loads of meth while the other not that much.
where is/are your nozzle placed?
Basically you dont want them negative since you are removing fuel from the injectors but not maxed out as well.
If you up the meth content you add more fuel so the trims should go more negative while if you put more water they should go more positive.

So bank 1 showing -20 at the end of my log is not good? I am using 100% meth and both nozzles are at elbow about inch apart.

[enrita]

Originally Posted by cn555ic

So bank 1 showing -20 at the end of my log is not good? I am using 100% meth and both nozzles are at elbow about inch apart.

better than stuck at 34% add water to the mix, do 70/30% and plot both banks on top of each other.
basically you are removing fuel from the injectors to keep the afr target. What is your OL? You could lower that value as well .

[cn555ic]

Originally Posted by enrita

better than stuck at 34% add water to the mix, do 70/30% and plot both banks on top of each other.
basically you are removing fuel from the injectors to keep the afr target. What is your OL? You could lower that value as well .

I run 100% meth for nitrous. Isn't lower dc of the injectors a good thing rather than working them at 100%? It would seem my meth content is enough to run rich, which is where I would like it to run nitrous

[enrita]

Originally Posted by cn555ic

I run 100% meth for nitrous. Isn't lower dc of the injectors a good thing rather than working them at 100%? It would seem my meth content is enough to run rich, which is where I would like it to run nitrous

well you are basing hitting the afr targets purely on meth since injectors are removing fuel. I would run meth/water only as temp/knock suppressor. my trims are fully negative on cobb race map.
anyway yours look fine and since you run nitrous its definitely better to run richer.

[cn555ic]

Originally Posted by enrita

well you are basing hitting the afr targets purely on meth since injectors are removing fuel. I would run meth/water only as temp/knock suppressor. my trims are fully negative on cobb race map.
anyway yours look fine and since you run nitrous its definitely better to run richer.

Thanks Enrita. That's what I wanted to hear. I want it as rich as possible for when I run nitrous.

[cn555ic]

Does setting higher or lower settings(values) on the O2 modifiers in the Procede play a role in a/f And fuel trims besides suppressing the cat efficiency codes??

[Jeff@TopGearSolutions]

Originally Posted by stratos_335

Nothing serious, but sometimes there is some afr fluctuation and a small difference between bank 1 and 2, 11.5 for bank1 1 and 12 for bank 2.

And here is the log:



Yes, I think that the first O2 sensor does all the hard work.


And really, what is the meaning of the fuel trims? Hight trims mean that injectors work on higher duty cycle to reach afrs? My car pulls really hard and I'm very satisfied with that. I just don't want to cause any injector failure for the health of my engine.

I've read somewhere that the range should be somewhere between 20 and 30. I don't know what negative values stand for

The percentage of open loop fuel required to meet target. So a 30 fuel trim means 30% more fuel needed compared to the open loop fuel values within.

[cn555ic]

So if running meth the ideal fuel trim should be 10-20 and going negative would mean injector is cutting fuel by x amount. I guess going 100 meth is not ideal then, and a mix of 80/20 would be optimal. I guess a balance between the two is better?