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Voyce · 09-21-2020, 03:11 PM

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.

09-21-2020, 03:11 PM	#1
Voyce Junior Member Join Date: Sep 2020 Drives: 86 Location: Chicago Posts: 7 Thanks: 0 Thanked 5 Times in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	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. Last edited by Voyce; 09-21-2020 at 08:06 PM.