Bought this car a few weeks ago and noticed the idle is lean off the wideband guage along with 50% and under throttle. Fully built d16z6 on 25psi. If u need more info about build I'd be glad to share. First thought was maybe wideband was bad. Had a brand new aem uego and got it put same deal still lean. I was thinking about wiring the white wire to eld on ecu and removing resistors r136 and r138 so my wideband would show on ecu side. I opened low speed fuel maps and selected from 750 Rpms to 1500 and tried adding up to 15% fuel with no difference on the wideband. Upon further looking I noticed they had it set for 1000cc inj when it actually has 2000cc. So any advice here would be great. When I get home I'm gonna upload a pic of the 2d low fuel map cause it doesn't look right to me. I'm no pro but have read for hours and can take on basic tasks with hondata. Lean conditions are only in idle and up to 50% throttle. Full throttle is 12.3afr like it should be. Thanks in advance for any advice

 

What is fuel pressure and IDC when it's lean? Have you tried adjusting base pressure?

 

Idc? And here is fuel pressure at idle and low fuel map

 

If this matters, only things I've changed on the setup was added 2 vibrant resonators and a vibrant street power muffler which are all straight through pieces. I didn't think that would affect anything as it already had a full 3in mandrel bent straight pipe on it when I bought it

 

IDC=idle duty cycle?
maybe you have some exhaust leaks?

and yes, adding 2 resonstors will change afr slightly,

 

Any change in exhaust flow/volume will change afr yes, but not to the point where you would still be terribly lean after adding another 15% fuel to the map in the problem area of the rev range.

 

I'm gonna check out my idle duty cycle. Do u guys ever have Hondas idling in the 4th and 5th columns?? And do u have any idea why they would have 1000cc injectors in fuel trim and not 2000cc like the car has?

 

That Low cam fuel Map doesn't look good at all! I would make damn sure they are 2000cc Injectors and not trust word of mouth...
You have made sure there are no Vacuum Leaks as well(although it's probably Tune mostly imo)?

Also you are aware you need to push either, CTRL-U or Upload changes to ecu(Up arrow in top left)(Circled RED in pic) After you make any changes? You can use "Realtime Update" under "Options" and not have to push anything. I personally like to just push CTRL-U after making any changes and not check Realtime Update..

Make sure the Lightening Bolt(Start/Stop Datalog F10)(Circled BLUE in pic) icon is clicked while making changes....and to view live data...

You can Attach a few current Logs here... DO NOT COPY FUEL NUMBERS I POSTED ANYONEThe Pic I posted was a Stock GSR/Injector, CAI, full Exhaust System and at 5660' Elevation Tune..

 

What do you mean by lean? dotted lines? 15:1?
You probably just created an exhaust leak during your upgrades, causing the sensor to read incorrectly until the volume increases under boost. Anyway I'll address the rest of your concerns also.

IDC = Injector Duty Cycle (the IACV duty doesn't affect AFR)

If it's on ethanol then it's not unusual to lower the injector flow rate to compensate for the extra fuel needed. But according to your fuel map values they look pretty average so I wouldn't worry about that value, your injectors probably just don't flow as well as they're advertised.

Your low cam fuel map looks fine. If your tuner modified columns to tune out a specific issue, there's probably a good reason he did it. That's not unusual either.

Effective AFRs vary on every engine, especially high power engines and especially if you're on ethanol which runs better leaner. You have cold plugs, they run weird in cold combustion, so it's ideal to keep them hotter with leaner combustion on any fuel. You should really specify what you mean by lean.

 

You should post a Datalog!