I got my low cam and high cam maps tuned how I wanted them, but for some reason things change after i've driven around for awhile. I can give wot in low cam and have my afr right around 13.2 where I want them, but then after about 10 minutes of driving I give it wot again and all of a sudden my afr wont go below the 14.5 area. I tuned my tables when the motor was warm so not sure why this is happening. I left the IAT compensation table stock. Now I thought that IAT table is what prevents this from happening? It does it every time I drive my car and it's driving me nuts cause I don't know if it's giving me a false reading or if my car is actually running way too lean. It acts fine in normal driving condition, but when I get on it and go towards wot it just hovers around 14.5. This happens in low cam and high cam. It's all normal the first 10-15 minutes of driving and then starts acting up. Any help guys? (I just ordered a hulog so at the moment I don't have any datalogging to show) Thanks for the help guys!

 

What injectors are you using with your setup.

 

Stock 240cc injectors. My motor is a stock b16a with full bolt ons

 

try zero-ing out all of your compensations as a test.

What EMS?

 

K. I'm using crome free

 

Crome has a mind of it's own. How old is your wideband o2 sensor?

 

Lol apparently it does. About 2 months

 

Think I figured it out. I changed the negative values on the IAT cop table all to be level at 1.00 and that didn't help, but then I got to thinking. I tuned the car when it was warm as I was driving around my neighborhood. And most of the time I did it at night when it was cooler. I realized that once it's starts to stay lean, is when my engine is heat soaked. So maybe I should drive it around a while first, get it nice and heat soaked and then tune it. Any thoughts on that? Thanks

 

I got it figured out. I upped the last 2 boxes in the IAT table to 1.15 and 1.20 that allows it to add fuel when it heats up and keeps my afr's correct

 

Thats odd. In theory, you should be pulling fuel OUT as the engine warms... Not adding.

 

Exactly. It seems odd to me too, but it's working this way so i'm not gonna argue with it lol. Crome is a weird program so it doesn't surprise me that things are a bit backwards

 

My guess:
When your engine warms up the ECT comp tables are pulling fuel and making it go lean.
Then your using IAT to add fuel back. You cant also rule out ECT Ign compensation.

2nd theroy:
Did you disable the O2 sensor.. When tuning? Also is it disabled now?
Because the engine could be going into Closed Loop mode. Which I have heard crome some times glitches with.

Leaving it enabled can play havoc on your tune, now if you tune then activate your o2 sensor set up your active A/F targets and eveything you won't have any issues from it.

I also think but not sure that the COMP tables for ECT and IAT are interpoled just like the Map's.

So when you adjust them you have to think of it like this. Tthe cell your on, the cell before it and after it are all averaged.

One of the most important things to tune is the COMP tables, they will lead to a nice fuel effecent engine and and also great power band in all conditions. It is one of the luxuries of fuel and injection and the reason Fuel Injection is better than carb's hands down.

 

I didn't touch the ECT tables and from the looks of it they don't seem to be connected to the IAT table. When I tuned I did leave my stock o2 enabled. So reading how you explained it I understand that might of been my issue. I really don't wanna go back and redo everything though. I've got my map where it needs to be and with the changes I made to the IAT table everything is working properly. So for now I think i'm just gonna leave it. Thanks

 

Having the O2 sensor plugged in and enabled makes all the info you posted earlier void... You need to be in open loop to do any fuel tuning, period.

Back to square one.

 

the same thing happens to me too.
no O2 sensor at all.
IAT goes up because of engine compartment heat, also because of hot oil especially.
When IAT goes up, it's even over 160-170 degrees celcius. your fuel is decreased and your ignition is retarded around 5 degrees which effects all of this.
this is directly from Honda. if it was a big problem, your car would misfire. but as you see, it does not. So dont worry, drive the car, this is normal, as the IAT goes down, everything will become to 'more' normal.

 

I really don't wanna start all over again. Even with leaving the o2 on all the time I managed to get the afr I wanted. It took a bit longer and a bit more work, but I still got it. Adjusting the iat table fixed my going lean issue. I just adds fuel now when it heat soaks and keeps everything right where it should be

 

Second this....

 

Just make sure you keep a eye on everything, becuase if your in an area that sees cold weather you may see huge swings in A/F during winter.

 

Will do for sure. I live in Austin though, so we only see about 2 months of actual cold weather. It's the 100+ degree days here from june-september that I'm more concerned about