nor11384

iTrader: (1)

So I noticed that when it’s cooler out because of rain etc or at night the afr seem to richened up. Idk if this depends on humidity or actual iat. I know there has to be a table or a way to control this. Any gurus have any advice for me on how to fix this? I messed with these table but dont know if it made much of a difference. I initiannly messed with it because at random times wot would be a point leaner than usual. Since i messed with it it hasnt happened again but today it was raining and humid and idle went from 14.5 ish to 13.4 today. This is in open loop btw.

nor11384

iTrader: (1)

Anyone?

nor11384

iTrader: (1)

I know someone must know something about this.

foxbat

Well any compensation table is meant to keep AFR stable. Are you using MAP or MAF?

nor11384

iTrader: (1)

I’m on sd Omni map sensor. I just want to know whether it works just for idle or all around. Is this the table to use or is there different one?

Biggiesacks

I think this is one of those downsides of running SD, as static (atmospheric) baro changes because of weather/altitude it effects the tune. I'm not sure temp comp is the right angle to attack this from. I think it might be a VE thing, but then I don't have SD tuning experience so its just a guess.

240Z TwinTurbo

iTrader: (25)

both temperature and humidity affect air density as well as altitude. I would have to search, but MRFRED has a post on BARO compensation, which at least takes into accountt altitude. The IAT sensor can only account for temperature so if you are adjusting the correct table for SD then you can change the values to get the desired AFR. I'm just not sure if that is the correct table.

nor11384

iTrader: (1)

Well I’m in fl so I’m at sea level. At night the car has always ran richer than day time. So that means it’s a temperature thing. There must be some kind of table for weather/temp/iat compensation.

Biggiesacks

yes temperature has an effect, but you said this happened when it was raining, and weather also has an effect. Maybe its both together, maybe its just temp.

https://en.wikipedia.org/wiki/Pressure_system

Notice rain is associated with a low pressure system.

nor11384

iTrader: (1)

Wow that makes sense. So there has to be a way to compensate.