LOL! logged my first ghetto run.

http://i5.photobucket.com/albums/y191/BowerR64/LiquidFocus/Ghettorun1.jpg

Go ahead laugh it wont hurt my feelings any. [giddy]

I wanted to make sure i had everything working and hooked up correctly.
http://i5.photobucket.com/albums/y191/BowerR64/LiquidFocus/Ghettorun2.jpg

This wideband kit i got used off e-bay uses a serial port to log the data to the PC well i just happend to have this older IBM thinkpad laying around with a 266 P2 i think with windows ME on it. I figured i would try it and see if it will work. It seem to work ok. It was just a quick buz around the block and back 2-3 minutes i think if that.

Least ill be able to compare the 2 positions by doing it once like this then in the mani-cat position.

lmfao! looks badass! as long as it works man!

HAHA, great! The color matched zip tie was a nice touch. (white would have looked out of place)

lmfao! looks badass! as long as it works man!

It looks badass? [???:)] ill have to hook it up like this for focusfest. [8]

It looks badass? [???:)] ill have to hook it up like this for focusfest. [8]

haha yup [headbang]

i'd rock it like that! as long as I know its working!

Well i think its working but it doesnt look right.

Im not even sure how to run the car while im logging the data.

This was just from one stop sign down the road about 1/4 mile and back threw the neighborhood.[???:)]

http://i5.photobucket.com/albums/y191/BowerR64/LiquidFocus/FIrstlog.jpg

what I don't see what wrong lol

I tune a LOT of high end Sig boats 28-50 foot EFI Big Blocks and have made a pipe to go in the Exh that sticks up over the back of the boat about 4 feet to keep it dry with bungee cords to each side , thats where I put the o2 sensor and you think yours is ghetto LOL

Tom

Well i think its working but it doesnt look right.

Im not even sure how to run the car while im logging the data.

This was just from one stop sign down the road about 1/4 mile and back threw the neighborhood.[???:)]




I don't find that graphs are understandable or really usable. I like tables of numbers better. That way I can use Excel to sort them, find averages, find highest and lowest and so on.

But from what I see it looks like you where closed loop the whole time and let off the gas 4 times, which would be where it goes very lean ... because of the fuel cut on deceleration, or maybe it's shifting?

Now if you could export the log to Excel you could sort out the highs, say above 15.5 AFR and you'd be left with the acceleration portions of the graph. Then look at the time from the lowest to the highest sorted in order by time. That will show you how fast the sensor is reacting to changes in the engine. The faster it reacts the better. Slower response is a good sign of a sensor going bad. But for a case where the sensor is far down the exhaust as you have now, response time isn't important as it won't be as reliable as it would be closer to the source.
And if you do all that sorting and what not then use the "trendline" option in the Excel graph to find how close to Stoich you really are, or your target AFR. Trendline can be really handy at times.

I don't find that graphs are understandable or really usable. I like tables of numbers better. That way I can use Excel to sort them, find averages, find highest and lowest and so on.

But from what I see it looks like you where closed loop the whole time and let off the gas 4 times, which would be where it goes very lean ... because of the fuel cut on deceleration, or maybe it's shifting?

Now if you could export the log to Excel you could sort out the highs, say above 15.5 AFR and you'd be left with the acceleration portions of the graph. Then look at the time from the lowest to the highest sorted in order by time. That will show you how fast the sensor is reacting to changes in the engine. The faster it reacts the better. Slower response is a good sign of a sensor going bad. But for a case where the sensor is far down the exhaust as you have now, response time isn't important as it won't be as reliable as it would be closer to the source.
And if you do all that sorting and what not then use the "trendline" option in the Excel graph to find how close to Stoich you really are, or your target AFR. Trendline can be really handy at times.

Yeah i just drove the car around the block, it might be shifting im not sure but i wasnt sure if it was even working correctly. Im still not sure how to use it. Hold the throttle at 2000 rpms? drive it under load and hold it at 2000?

Without a tach logged with the A/F reading i cant tell really what its doing. Unless i just rev the engine up and hold it at certin RPMs?

Its still new im still learning what i need and stuff so im just happy i got it working really.

Just work from memory then. If you know you accelerated but didn't go WOT then the lean parts are certainly you letting off the throttle.


Probably best to start simple though. Let the car idle and log that. Don't step on the throttle once. Log about a minute or so and look at what it shows. Basically any closed loop log should look similar if the car is running well. Anything that goes rich will be WOT or damn close and leaner will be letting off the throttle. If you have a good baseline everything else will fall into place.

Just work from memory then. If you know you accelerated but didn't go WOT then the lean parts are certainly you letting off the throttle.


Probably best to start simple though. Let the car idle and log that. Don't step on the throttle once. Log about a minute or so and look at what it shows. Basically any closed loop log should look similar if the car is running well. Anything that goes rich will be WOT or damn close and leaner will be letting off the throttle. If you have a good baseline everything else will fall into place.

What is closed loop?

Closed loop is anything not Wide Open Throttle. That is, the ECU used feedback from the O2 sensor to control fuel trims and shoots for a Stoichiometric AFR, 14.68 for Gasoline.
If you look at your graph that's how I can tell you where closed loop, most of the graph is centered around Stoich.

Open loop does not use the O2 sensor. It used a different loop up table in the ECU that is based on MAF Counts (voltage) only. That table says the X counts equals Y amount of fuel and it doesn't shoot for any AFR. So at WOT if you are lean you have to adjust either tha amount of fuel or the MAF counts to get you to the AFR you want to see, it isn't automatic like closed loop is.

I would need a dyno to do that right? I think before i try WOT ill wait to get the SCT unit so i can record more data. Im not even sure if i can get to WOT with the way my car is setup. Ill have to wait for the SCT thing to know though what i have right now doesnt have enough sensors and stuff to measure anything.

Its just a basic AFR gauge that i can log with. Its kinda fun for now though