Hondata

I have a 2010 Civic Si with a 3.5" intake, J35 TB, and race header with the stock exhaust. When I had my old 3" intake, I'd been running the MAP-based, AEM SRI + race header Hondata tune, and it ran great. After getting my J35 TB, I got an E-tuner to fully tune it for me, and they got it running even better.
I recently installed the 3.5" intake, and it seems to run decent, but it definitely seems to bog a little at mid RPM and near the redline. AFR is also off in a few spots. I took a look at the datalog, tried adding a bit of fuel (it's a little rich in some areas now, but better than lean), and it does seem like it helped out a little bit, but it's still seems like it bogs a bit below 3500-4000, and above 7500 RPM.

Is there someone willing to look at some datalogging and help me out with my tune a bit? I'm still not too knowledgeable (IE, brave enough) to mess with with my tune too much, and I'm not ready to plop down more money for ANOTHER E-tune, especially since I plan on going turbo sometime next year.

I appreciate the help, you guys! I'm a long-time lurker here, and this site has helped me in so many ways over the last couple of years...

So, I had the chance to mess with things a little bit, and haven't really noticed much of a change. Then again, I'm still not really sure what I'm doing, even after watching a few tutorial videos. So, definitely, a bit of help would be appreciated so I don't mess something up. 😅

Post the calibration you are running and a datalog. I can take a look at it and let you know how its running.

- Ed

Sorry it too so long to get it (crazy long work week), but here's the tune and a datalog from earlier today. I did 2 WOT pulls in 3rd at the end.

Thank you for the help.

The VTC tables area bit wonky and the AFR is a little lean for my taste but not bad. The fuel overall is ok, and I did not see any knock in the log.

- Ed

Any recommendations besides adding a bit of fuel? I thought my timing was golden after my last tune, and I didn't think the intake would have THAT much of a difference on timing... SO I'm guessing the tuner didn't have it as squared away as I thought.

So, I added a bit of overall fuel (just increased the overall fuel table by 2%). I'm sure it's maybe a tiny bit rich in some areas now.. but better that than running lean in a few spots. Seems to run a LITTLE better now, but I'd still appreciate some help with the timing/VTC.

With timing I suggest you increase it in small increments. If it knock then you reduce it.

VTC is a bit more complex. You need to optimize each table one at a time and then blend them. I suggest you look for videos on YouTube. Start with Evans tuning.

-Ed