[VinnAY]

OP doesn't know what a backfire is.

[LT4Greg]

Anybody notice that Roto-Fab hasn’t chimed in on the post!!

[ctrlz]

Originally Posted by 6spdhyperblue

It is an airflow straightener to properly direct air across the MAF sensor.

This is exactly what it looks like to me!
Remove it and turbulent air hits the MAF, which will register as less mass. ECM will add less fuel. The car will feel more powerful and there will be less exhaust soot... because you are running lean. Not good.

O2 sensor will see this and bump the fuel trim.
I'm not exactly sure how the MAF reading vs O2 sensor tug-of-war plays out, but there are limits to the fuel trim side for sure.

[f.d]

Originally Posted by ctrlz

This is exactly what it looks like to me!
Remove it and turbulent air hits the MAF, which will register as less mass. ECM will add less fuel. The car will feel more powerful and there will be less exhaust soot... because you are running lean. Not good.

O2 sensor will see this and bump the fuel trim.
I'm not exactly sure how the MAF reading vs O2 sensor tug-of-war plays out, but there are limits to the fuel trim side for sure.

This is what happens exactly, you are right.
But the engine didn’t run lean, you can see the 2 videos.
But i do feel the engine is warmer than before, and it’s good for me, i live in cold area ( today morning it was -5 c / 24 F degrees)
In fact cats temperature sensors gives mor readings , more about 100 c degrees.

# Important Note : by adjusting the R-F filter inside the box ( turning the filter ) you can slightly have different numbers. So you can make the numbers as you wish.

For me : my choice for now during cold winter, LTFT +2 % while cruising. And under a higher load LTFT go to -1 %

Wisely i will adjust the filter in next summer, when it will be 20 c / 68 F degrees To have a more rich number ( safety).

[f.d]

That is what happens with my camaro exactly.
I’m not a YouTube-r or trying to , just trying to give my experience with the car, maybe it will be useful for somebody.

the 3 video shows/explain everything, so pls listen carefully & read t description.
Please be careful with your car. Don’t make any damage for you car or self.
Good luck

[6spdhyperblue]

There are no cat temperature sensors.

The ltft goes to -1 under old because it’s a narrowband o2 sensor. Look up how they work.
That number under load doesn’t mean anything because you skewed the reference point

[f.d]

Originally Posted by 6spdhyperblue

There are no cat temperature sensors

There are 2
Next weekend i will film everything

[6spdhyperblue]

Nope. Find the part number

[f.d]

Originally Posted by 6spdhyperblue

There are no cat temperature sensors.

The ltft goes to -1 under old because it’s a narrowband o2 sensor. Look up how they work.
That number under load doesn’t mean anything because you skewed the reference point

There are 2 OEM sensors for the 2 cats temperature.
Wait to the Saturday, Im busy now.

[6spdhyperblue]

No there’s not. They are calculations by ecm

[f.d]

Originally Posted by 6spdhyperblue

No there’s not. They are calculations by ecm

What i have:
Cat 1 temperature
Cat 2 temperature

And always cat 2 little bet lower than cat 1, because always LTFT in bank 2 lower than bank 1.
Wait for the videos.
BTW; after this i will make a thread for cats temperature.

[geaux_tigerss]

Is there a way to report threads as garbage? I mean holy crap.

f.d, you don't know what you are doing, so I'm going to help you educate yourself in the hopes that this kind of stuff clogs the forums a bit less often.

This is a good idea of how your ECM controls your engine:
http://www.hptuners.com/help/vcm_edi...vanced_e78.htm


This is a decent page on how mass air flow sensors work:
http://www.hptuners.com/help/vcm_edi...vanced_e78.htm

The metal bit you are messing with is a simple flow conditioner that helps create a laminar (as opposed to turbulent) flow so the MAF is more accurate.

See here:
https://easterninstruments.blogspot....-profiler.html

You have negative LTFT because it is safer for an engine to start out too rich and tune leaner (which is how Chevrolet designed it), not the other way around. Your LTFT's will always change. Always. That is the whole point of closed loop combustion. Air density (via temperature and pressure - altitude), humidity, your fuel blend (octane, ethanol content, contaminants), engine wear, these things all affect combustion stoichiometry. This is why your LTFTs change all of the time.

https://en.wikipedia.org/wiki/Intern...bustion_engine

Put your intake back together the way it was designed, enjoy your car, and either learn more about this hobby or find a different one.


FWIW I attempted to tune my MAF after installing a Rotofab AND headers. It changed by 1.5% at MOST and in only a few cells - most were unchanged. I didn't even change the tune because it was within measurement noise.

[f.d]

Originally Posted by geaux_tigerss

Is there a way to report threads as garbage? I mean holy crap.

f.d, you don't know what you are doing, so I'm going to help you educate yourself in the hopes that this kind of stuff clogs the forums a bit less often.

This is a good idea of how your ECM controls your engine:
http://www.hptuners.com/help/vcm_edi...vanced_e78.htm


This is a decent page on how mass air flow sensors work:
http://www.hptuners.com/help/vcm_edi...vanced_e78.htm

The metal bit you are messing with is a simple flow conditioner that helps create a laminar (as opposed to turbulent) flow so the MAF is more accurate.

See here:
https://easterninstruments.blogspot....-profiler.html

You have negative LTFT because it is safer for an engine to start out too rich and tune leaner (which is how Chevrolet designed it), not the other way around. Your LTFT's will always change. Always. That is the whole point of closed loop combustion. Air density (via temperature and pressure - altitude), humidity, your fuel blend (octane, ethanol content, contaminants), engine wear, these things all affect combustion stoichiometry. This is why your LTFTs change all of the time.

https://en.wikipedia.org/wiki/Intern...bustion_engine

Put your intake back together the way it was designed, enjoy your car, and either learn more about this hobby or find a different one.


FWIW I attempted to tune my MAF after installing a Rotofab AND headers. It changed by 1.5% at MOST and in only a few cells - most were unchanged. I didn't even change the tune because it was within measurement noise.

For me, all what you did write are garbage.
Keep it for yourself, Educate you self, start with (How to communicate with humans).
I’m not asking for your help.
I do what i want, it’s my car and i do what my choice.

[f.d]

For who is interesting:

See at 10:50 No bracket inside the GM performance CAI

https://youtu.be/QoLWMR3SLNE

It’s not a god how made R-F CAI.

Why Roto-Fab is 100% correct design, and GM CAI is not?!