Tuning MAF in Open Loop ?

Megan370z · 08-28-2011, 10:31 AM

for those of you who has the experience in tuning.

I'm trying to fine tune the MAF at idle/cruising

Would it be better to tune the MAF in Open loop ?
because right now my AFR fluctuate from 14 to 15 Afr at idle and the compensation are within 95-105 ..

I have read that the O2 sensor should do that in 1 sec but mine takes 3.7 sec from peak to peak .

so now I'm guessing my OEM 02 Sensor are getting too slow ?!?!

disregard the LC1 log at 20.8afr , I just installed everything with the LC1 and computer to make sure everything work and log correctly.

MattP725 · 09-01-2011, 03:04 PM

I don't know if this is relevant but when I was at Performance Motorsports they told me that they don't mess with the idle tune... it is always rich and irrelevant I guess.

What are you really going to gain?

Megan370z · 09-01-2011, 04:25 PM

Quote:

Originally Posted by MattP725

I don't know if this is relevant but when I was at Performance Motorsports they told me that they don't mess with the idle tune... it is always rich and irrelevant I guess.

What are you really going to gain?

since the fluctuation was up to 1.5afr up or down . I tried to isolate the possible problem.
but even in Open loop with my wideband still see some fluctuation of about half of what I was getting..

to answer your question ; Im trying to get a more stable MAF tune because my whole CAI is custom made. (maf tube included)
dealing with te K-fuel / MAF table isnt an easy job.

at first I thought my K-fuel wasnt alright , which seemed to be one of the problem .I still suspect my OEM AFR wideband to get sluggish from the finding I have done ...

ChipsWithDips · 09-01-2011, 04:44 PM

Have you logged the MAF signal at idle to see if it is getting a smooth reading?

Megan370z · 09-01-2011, 06:08 PM

Quote:

Originally Posted by ChipsWithDips

Have you logged the MAF signal at idle to see if it is getting a smooth reading?

yeep , there isnt any problem there.

08-28-2011, 10:31 AM	#1 (permalink)
Megan370z A True Z Fanatic Join Date: Oct 2009 Location: Canada Posts: 1,156 Drives: 370z Rep Power: 23	Tuning MAF in Open Loop ? for those of you who has the experience in tuning. I'm trying to fine tune the MAF at idle/cruising Would it be better to tune the MAF in Open loop ? because right now my AFR fluctuate from 14 to 15 Afr at idle and the compensation are within 95-105 .. I have read that the O2 sensor should do that in 1 sec but mine takes 3.7 sec from peak to peak . so now I'm guessing my OEM 02 Sensor are getting too slow ?!?! disregard the LC1 log at 20.8afr , I just installed everything with the LC1 and computer to make sure everything work and log correctly.

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09-01-2011, 03:04 PM	#2 (permalink)
MattP725 A True Z Fanatic Join Date: May 2011 Location: Toms River, NJ Posts: 1,904 Drives: 2010 40th Rep Power: 16	I don't know if this is relevant but when I was at Performance Motorsports they told me that they don't mess with the idle tune... it is always rich and irrelevant I guess. What are you really going to gain?

09-01-2011, 04:44 PM	#4 (permalink)
ChipsWithDips Enthusiast Member Join Date: Mar 2011 Location: Austin, TX Posts: 279 Drives: '11 Gunmetal 370Z MT Rep Power: 14	Have you logged the MAF signal at idle to see if it is getting a smooth reading?