Running Lean After 3.5 Inch CAI Install

[iantt0480]

I recently installed an Acquity 3.5 inch cold air intake and was recommended to use the hondata stock reflash basemap being told that it should work for that upgrade. A couple months later I started getting the "bank 1 is running lean" engine code. My mechanic thought it was a tuning issue and tried reprogramming the throttle body. Is there a basemap that I could use that would make me run richer? Any other advice for this situation?

[iantt0480]

Attached are some datalogs that I took revving while parked. First is the map with my mechanics adjustment to the throttle, and the second is using the "CAI, RBC intake, cat delete, catback exhaust" map as i thought it would run richer.

[EFICU]

I recently installed an Acquity 3.5 inch cold air intake and was recommended to use the hondata stock reflash basemap being told that it should work for that upgrade. A couple months later I started getting the "bank 1 is running lean" engine code. My mechanic thought it was a tuning issue and tried reprogramming the throttle body. Is there a basemap that I could use that would make me run richer? Any other advice for this situation?

Unfortunately datalogs being only 4-5 seconds long don't give us too much data. The first one is really bad though, the fuel trims are maxed trying to add fuel, hence the lean code you got. The second one doesn't look too bad, but the engine is still cold and you aren't driving it yet. If you are using the calibration you mention, with "RBC" in the title, that one will not run properly unless you have swapped the intake manifold from your 9th gen to the RBC intake manifold from an 8th gen. An RBC manifold is basically an 8th gen Si manifold. The difference in intake manifold styles drastically changes the fuel and ignition curves. Chances are it's very rich now running that calibration, or possible lean in some areas, either way though not ideal.

What year is your 9th gen? The only mod is the acuity, everything else is stock? Is this current setup your long term package, or do you have plans in the near(ish) future to add a exhaust or catback?

With the Acuity, the engine needs to be tuned via the MAP sensor using speed density principles. So the first calibration you had was still running the mass airflow (MAF) sensor which caused the issue initially. The Acuity intake pipe is much larger than the stock intake tube which changes the way air passes by the MAF sensor, hence causing your lean issue. With the current calibration you will have a similar issue.

[iantt0480]

To answer your questions, I have a 2012 si, currently only running the CAI everything else bone stock, I do intend on installing a cat back in the near future.

Questions: 1) you mention tuning based on the MAP sensor rather than the MAF, how would a beginner like myself go about doing that?
2) you mention the datalogs being short, should I upload longer ones, would that help the problem solving process?

[EFICU]

Are you planning on tuning it yourself? If so, I can help you get to the point of running on the MAP sensor. If you want some help tuning it from me, then I would send you a calibration to start on with the necessary boxes checked to make it run on the MAP sensor.

Longer datalogs would only allow us to see how bad the issue is and what exactly it's doing. A normal datalog we look to for sufficient data averages run about 20 minutes. We can see a little bit in 5 seconds, but not much to make decisions on is all.

If you want some help tuning it I can help you out. Since you plan to add an exhaust soon, I would tune you the quicker route to get the car safe for you. Then once you get the exhaust on, I would recommend tuning it the longer route to get the most out of your setup. Since the datalog process is so long, I hate to take you the long route twice is all. If you are still driving on the RBC calibration we should get you on something soon to get everything in line.

Let me know.

[iantt0480]

I would like to get help from you. Quick route works for me, what would you recommend as a starting point? Is there a specific calibration I should start with and send over a 20 min datalogs for you?

[EFICU]

Okay I put together a basemap for you. And yes, take this one for a 20-30 minute drive with normal type city driving. On the drive, make one wide open throttle (WOT) pull in third gear from 2500-7500. For this first one, just keep the driving normal and calm, and only one WOT pull. Once we get some data, I can make the necessary adjustments for you to have fun with the next one. For now, let's just gather some data from a nice smooth drive with one WOT pull, then you can have some fun with it in the next one.

Iantt0480.SD.Rev01 (Vtec4500).fpcal

[EFICU]

I made a small change to the file, use this one, Rev01.1.

Iantt0480.SD.Rev01.1 (Vtec4500).fpcal

[iantt0480]

Awesome thanks for the help. I took the attached datalog, let me know what to do next.

[EFICU]

Man we almost nailed it on the first shot, haha. It's looks really good, I made a few part throttle fuel adjustments and some WOT adjustments. We had a couple knock in a normal area, so I adjusted the ignition for those. Feel free to have some fun with this next one, it's plenty safe. Still aim for twenty minutes or so in length, and at least one WOT pull in third gear. But feel free to make a few pulls if you want, it's ready for you to drive it however you want, just be safe out there. We'll see how it looks.

Iantt0480.SD.Rev02 (Vtec4500).fpcal

[iantt0480]

That's good to hear, I will take this out and datalog it as well, but I have a question. I notice that whenever I come off the throttle and the engine is winding down the A/F jumps to like 30, is that supposed to happen?

[EFICU]

Sounds good!

Yes the AFR will spike to 29-30 because the fuel injectors are shutting off essentially. The injectors shut off between shifts and on deceleration. So it’s perfectly normal for it to do that.

[iantt0480]

Awesome, attached is the new datalog. If this is good enough I would say don't bother doing another file, since I will be upgrading my exhaust soon. Thanks again for all your help!

[EFICU]

It looks like you posted the last calibration I sent you, not a datalog. Can you post the latest datalog when you get a chance.

[iantt0480]

whoops sorry attached is the datalog