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Old 03-30-2005, 01:49 PM   #1
darksands
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Default Access Tuner log. your comments

Hi, just wanted to post my tuner log that I took recently and see if you guys have any comment. I really dont know too much about tuning and want to learn a bit more. Although I know that the A/F is not accurate, I was curious on how to read it in the log. This log was taken on a random ride to TacoBell so it is probobly not the best log to tune from but I was just curious on how I would read it.

another question is that I may be running lean so if I changed the fuel map and decreased each A/F value by 2%, would that work or would that just make me detonate? I prefer to run a little more rich than lean.

Thanks for all the Helpful respnses.

AccessTuner LOG
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Old 03-30-2005, 02:26 PM   #2
Jon [in CT]
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I wonder why each sample is repeated in the log? For example 1st and 2nd are identical, 3rd and 4th are identical, etc..
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Old 03-30-2005, 02:29 PM   #3
buzz313th
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Quote:
Originally Posted by Jon [in CT]
I wonder why each sample is repeated in the log? For example 1st and 2nd are identical, 3rd and 4th are identical, etc..

Because the log rates are too fast.. turn em down and you will get a linear log.
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Old 03-30-2005, 02:56 PM   #4
Jon [in CT]
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Quote:
Originally Posted by buzz313th
Because the log rates are too fast.. turn em down and you will get a linear log.
Oh oh. I sense there's a really smelly alogrithm under the covers here.
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Old 03-30-2005, 03:43 PM   #5
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Do you have an active EGT probe? I'm guessing that its the base ignition map I see without knock correction or is it total?
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Old 03-30-2005, 04:10 PM   #6
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In response to the initial question, the AFR values you see in the log are in Lambda. During your WOT run at .77 Lambda you are right around 11.3:1 AFR. Not too trust worthy though on the stock O2. I see you never get richer than .77 at that showed up at times when you never broke .5 bar and 60% TPS. Looks like the stock 02 sensor or the ECU will only read down to 11.3:1. Time for a WB02. But from a quick overview and a pretty useless log, looks like you're plenty rich.
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Old 03-30-2005, 08:22 PM   #7
darksands
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Quote:
Originally Posted by phantomsr
In response to the initial question, the AFR values you see in the log are in Lambda. During your WOT run at .77 Lambda you are right around 11.3:1 AFR. Not too trust worthy though on the stock O2. I see you never get richer than .77 at that showed up at times when you never broke .5 bar and 60% TPS. Looks like the stock 02 sensor or the ECU will only read down to 11.3:1. Time for a WB02. But from a quick overview and a pretty useless log, looks like you're plenty rich.
yes, it is a useles log.

Quote:
Originally Posted by buzz313th
Because the log rates are too fast.. turn em down and you will get a linear log.
I will turn down the log rates. Have any suggestions to how fast I should log?

Quote:
Originally Posted by terry61oz5
Do you have an active EGT probe? I'm guessing that its the base ignition map I see without knock correction or is it total?
I do have an EGT but I am questioning its reliability. It is telling me that I am running very lean. My temps go up to 1500F. I will test the EGT probe in some boiling water. So far no knock and no problems and the log says im running rich. Even at partial throtle, the EGT's are high. I do not have a WB02 but it is time for one.

This log was just a test to see if the ST worked or not. I am also trying to learn how to tune but Im not touching real time tuning. Not till i learn alot more. I appreciate all your input, thanks.
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Old 03-30-2005, 10:39 PM   #8
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niiiice... here' s my first log I just made tonight... I recorded almost every parameter
http://criztoph.zapto.org/misc2/log_3_all_temp47.csv
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Old 03-30-2005, 10:46 PM   #9
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if the fuel pump duty is 1.00, is it maxing out?
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Old 03-31-2005, 12:33 AM   #10
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Quote:
Originally Posted by criz
if the fuel pump duty is 1.00, is it maxing out?
Yes. Fuel pump is slowed down when not uder heavy load to reduce fuel temps and extend pump life.
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Old 03-31-2005, 02:02 AM   #11
criz
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does this mean I need an upgraded pump?

thanks
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Old 03-31-2005, 11:24 AM   #12
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try a log in 4th gear 1500 rpms to red line
i see your maf voltage very close to max
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Old 03-31-2005, 11:43 AM   #13
criz
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how do you open up the maf voltage to get more room?
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Old 03-31-2005, 12:43 PM   #14
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If I remember correctly, the fuel pump duty is altered through the fuel pump controller. This is to conserve the life of the fuel pump. Under low load it runs reduced power (duty) and under high load it runs full power. This really has nothing to do with fuel pump size. Running out of fuel pump can be seen when your injector duty cycle is 100% and/or you can't get any richer under high loads.

-Jon

Last edited by stimpy; 03-31-2005 at 03:08 PM.
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Old 03-31-2005, 03:01 PM   #15
criz
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oh, i thought if the injector duty was 100%, that just meant the injectors were maxing out... hmmmm thanks stimpy
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Old 03-31-2005, 03:10 PM   #16
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Injectors maxing out means that the ECU is trying to hit an A/F target and it can't open the injectors up any more. Only way to increase your fueling at 100% is to increase your fuel pressure.

This and the fuel pump duty are two entirely different things.

-Jon
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