lando griffin

Can anyone tell me what your AFR is with rh, intake and exhaust? Just trying to get an idea.

ajpturbopittsburgh

Air fuel ratio? Why do you want to know?

lando griffin

Yes, just want to know if it will make the motor run too lean.

ajpturbopittsburgh

I'd check with the manufacturer of the parts you want or have. I doubt anyone that has their car normally aspirated will have a wideband guage installed on their car. There wouldn't be a need. That's a 300 dollar or more guage plus installation. That's alot to spend on a mod that won't give you any power.

24boosted

iTrader: (1)

Make sure to have Hondata reflash ready to go if you are installing those parts.

burnout8488

I don't think those parts will put your factory tuned car into an excessive-lean condition. Many people have used those mods on here without a tune.

However, a hondata reflash will really unlock the potential of those mods if you got it.

i-VTEC_DOHC

i saw a vid of a fg2 shooting a flame with i/h/e.
so it ran rich.
but idk the exact setup of the exhaust, or what intake and header it had.
plus the elevation, temperature, humidity, all that stuff plays in also.
cuz i've shot a small flame with my fg2 when it just had a dcrh.

lando griffin

Yeah, there are numerous people, but I still want to know. I worked my *** off for this car so I don't want to throw it all down the drain.

How accurate are the sniffers compared to an actual wideband o2? Or are they even comparable?

dirtySOHC's

stock sensors are narrowband...they are only really accurate in stoich. wideband is exactly what it sounds like....they can calculate a wider range of AFR's. it's always nice to have one but not really necessary for bolt-ons.

lando griffin

Ohh ok. Thanks.

FA5Clown

im just guna be that guy and ask, but what exactly does it mean when your engine runs too "lean" or "rich". im asking cuz idk and id like to learn so be nice please.

i-VTEC_DOHC

when a car runs lean, there is more oxygen than fuel in the mixture going into the cylinder, which results in burnt valves over time.

when it runs rich, there is more fuel than oxygen in the mixture, which accounts for backfires with flames. and wasted gas. <= almost forgot that part

dirtySOHC's

there is always more air than fuel...running rich just means there a little more fuel than usual.

example...if your AFR is 10:1 which super rich there is still 10 parts of air to 1 part of fuel

vladd

you sure the k-series oxygen sensors aren't wideband? i thought i've read something about that, and how you only need to add a gauge to read the afr.

vladd

if anybody cares, i looked around real quick through other messageboards and people are say that the primary o2 IS a wideband on the k20. the shitty thing is that you can't wire it up to any gauges, you can only view it using k-pro (obviously that's not an option on the civic yet but it is on the rsx).

i-VTEC_DOHC

you get the dang point of my post lol

dirtySOHC's

i just assumed being that previous generations are all narrowband

good to know...I wonder what the benifit is of having a stock wideband sensor

norcalcrx

The benefit is to allow the k series cpu to control the engine better for cleaner emissions.

dirtySOHC's

makes sense

and you're single cam numbers are awesome. i've never seen the Tq match up with hp like.

jewjew bean

these cars should respond to bolt-ons way better than any other honda before it due to the maf

i-VTEC_DOHC

i heard otherwise.
i always hear that the maf limits possibilities.
which is true

jewjew bean

I heard the same but how many of those people actually know what they're talking about? How many people hooked up a WB or went to a dyno or are they just hondata nut swingers?

the whole purpose of a map is to provide fueling based on the actual air volume not just guessing and using feedback from the o2 like SD does which it turns out is better for emissions and performance as well. Why would honda defeat the purpose of the system?

talampunay

mass airflow sensor is just another input the pcm uses for more accurate control of fuel delivery along with rpm, throttle angle, and O2 signal in closed loop.

honda have used air fuel ratio sensor on their 2 liter engine since 2002, and 1.8 started using them in 2006

anyone got a firm grasp on how these AFR sensors operate?
i will be delighted to get schooled on this subject
still trying to understand how AFR differs in operation compared to conventional HO2S

GoHybrid

well, at least as far as the 06+ civics are concerned, the primary O2 sensor has a membrane (see Nernst cell) that generates a voltage with respect to the presence of a certain type of ion, in this case, oxygen. What the ECU does to monitor O2 levels in the exhaust stream is supply voltage (and therefore current) to an air pump within the sensor to try and maintain a specific voltage potential. When O2 is scarce (rich mixture) the ECU must send more current to the pump to maintain the cell's voltage. When it's lean, the ECU can actually reverse voltage and pump air out to maintain the voltage

So it is by measuring the current that must be sent out to maintain a reference voltage at the O2 sensor that the ECU knows what the AFR is.

For those who were interested - this is a log pulled from my car using the stock AFR sensor. B1S1 reads into the logger as Lamda, but I've converted it to AFR based on the 14.7:1 stoichiometric ratio for the graph.