Understanding how to read Datalogs
 

Hi,

I was hoping someone could help me understand how to read my datalog. As most people i'm following this thread to learn https://www.ft86club.com/forums/showthread.php?t=69871


This was taken on a 2020 86 AT with a trd intake and trd catback.

https://datazap.me/u/voyce/short-dri...g=0&data=1-7-8

According to the article I should be looking for the IAM (Ignition Advanced Multiplier) to look for knock in my engine. I believe I didn't select the right fields to log because I don't see an IAM in my log. Is that correct?

edit: I think I found the IAM, it's adv. multiplier but mine stays at 0. I don't think this is due to knock correction, I believe it's just incorrect logging from OFT, looking into this currently.


Moving on to Air Fuel Ratio

My AFR values look good according to the thread (No questions there)

I have the TRD air intake which from research on these forums has led me to believe that it scales similar to the stock air intake. Although from my logs it's evident I have moderately high LTFT which may be due to the intake or my fuel (93) has a higher ethanol content in it.

LTFT should be +/- 8% which around idle it is, but when moving it seems to spike upwards to 14, ideally, what do I want to see? A LFTF of 0? with spikes of +/-8%?

I am not concerned with MAF scaling just yet, because I have yet to flash OFT stage 1. I'll do datalogging again and hopefully be able to better read the logs to see if I need to do MAF scaling.

:thanks:

Talk to at @steve99 he is the tuning guru....
I would say you should allow at least 50 miles for. Ltft to stabilize. Your afr under idle should be around 14.7 and as long as the maf sensor sits in the same spot as stock location mad scaling shouldn't be too off. Your advance multiplier should stay at 1.0 if it drops the car is pulling timing. But talk to Steve lol I'm only saying what I've learned from him. Also if you're not boosting switch that one for advance multiplier. When you're selecting channels you can scroll up and down you should find it.

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Yeah i've read that after each flash/refuel it takes a bit for Ltft to stabilize. This datalog is on the stock tune (I have yet to flash anything) with 93 and has been running it for over 50 miles.

I also have learned quite a lot from Steve :)

Lol he's the best, he's currently working on my custom tune.

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Agreed!
No doubt about that, this community has some incredibly intelligent and passionate people.

Lol and he's been really patient with me because I've switched up my setup on him like 3 times just trying to squeeze out the the most I can.

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I read through the thread and it’s replies this time and got all my questions answered, thank you!