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Old 08-03-2009, 08:45 PM   #1
zetec#1
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What to datalog

What should i datalog???\

should I do the log @ WOT or cruising or even idle??


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Old 08-03-2009, 09:40 PM   #2
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There are a bunch of things to datalog. You want to check your long term fuel trims to make sure they're disabled (should read 1 in datalogs) and won't cause adaptive learning to go back to stock levels eventually. Short term fuel trims can be mathematically manipulated to give you an idea of a/f ratio. Pressure drop across fuel injectors is helpful to make sure you aren't losing fuel pressure (stock program target is 40 IIRC). MAF counts are important as the zetec pegs the stock MAFS at 1023 counts (anything above that and it goes into open loop and dumps fuel). Spark advance will tell you what your ignition timing is running at different levels. Air charge temp just tells you your inlet air temp, and coolant temp is self explanatory. If you have a wideband O2 sensor, datalog that too. At idle and cruising at part-throttle it should be at stoich (14.7) or near there and at WOT it should be 11.5 or richer for FI and probably 12.5 or 13:1 for NA, but that also depends on how much spark you run and whatnot. Ideally you'll work with your tuner to establish a solid idle file and then do some rev logs, then drive the car and check for driveability issues. After that you can do the WOT stuff as that's the most taxing on the car.
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Old 08-03-2009, 10:25 PM   #3
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You off on a few things there

QUOTE "Short term fuel trims can be mathematically manipulated to give you an idea of a/f ratio. "

STFT1 is for the fuel trims this tells you how much the ECU is adding or subtracting fuel from the info received from the o2 sensor to get to the targeted 14.7 for idle and cruise (part throttle) ONLY it will not give you an AF information just trim

QUOTE "MAF counts are important as the zetec pegs the stock MAFS at 1023 counts (anything above that and it goes into open loop and dumps fuel). "

The MAF is very important , the MAF is done at 4.9 volts/ 1000 in my opinion , If you hit the 5 volts/1023 counts then the ECU cant do anything with the info and you engine can go VERY lean , if your at 1023 counts then you all ready in open loop the MAF pegging does not cause an open loop condition , open loop is set mostly by TPS counts switch
The MAF is good info because you can take that reading and go to the Maf Transfer Function to +/- fuel and adjust closed or open fueling if needed

A good short list I like to use is

ect
iat
fuel psi drop across inj
load
maf voltage/counts
spk retard (knock sensor)
spark advance
spark source
rpm
tps
stft1

There is a ton more if issues start showing up but thats a good start

Tom
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Old 08-03-2009, 10:26 PM   #4
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list please
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Old 08-03-2009, 11:57 PM   #5
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Quote:
Originally Posted by 1turbofocus View Post
A good short list I like to use is

ect
iat
fuel psi drop across inj
load
maf voltage/counts
spk retard (knock sensor)
spark advance
spark source
rpm
tps
stft1
Hey, Tom
is the list you want to datalog tomorrow, is there anything missing from there?
Im gonna do a file wth this info and email it to you tomorrow unless you tell me otherwise.
Thnx

Rich
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Old 08-04-2009, 12:42 PM   #6
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Just watch the AF if it gets to high the lift , add your AF to the log list

Tom
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Old 08-04-2009, 07:44 PM   #7
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whats the A/F under.
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Old 08-04-2009, 10:24 PM   #8
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You need to buy a wideband O2 sensor setup (AEM, Innovate are just a couple of the better companies). If you hook it up correctly in my opinion the AEM is the easiest to use and it'll show up under one of the 4 analog ports. I have mine set up on analog 1.
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Old 08-04-2009, 10:57 PM   #9
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what dose the WBo2 hook up to
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Old 08-05-2009, 10:15 AM   #10
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dump
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