Hondata

I'm new to all of this - just completed my K24a2 swap into a EK. When the car is at idle, AFR is green and right where it needs to be, however upon acceleration when I hit 1800-2000 RPMS, the car cuts and AFR leans all the way out. I'm using the stock tsx base map in Kpro.

The motor has stock injectors, a CAI, stock intake manifold, Skunk2 Alpha headers, Skunk2 72mm TB. The car has no exhaust after the headers, so O2 bung is right at the end.

Just want to make sure that everything is good and I believe it's swapping to open loop when AFR leans all the way out and then kicks back over to closed loop.

Here's the data log file attached.

Have you tried adding fuel in the area it’s running leaning?

Post the calibration file you are running as well.

I can take a look at it.

-Ed

Here's the tune. I haven't tried increasing fuel in those areas, still really new to Kpro and tuning in general. Would I just go into the table for fuel low and high speeds and increase there with the little blue + sign?

Also, just wanted to say thank and I appreciate your help. Total noob here :)

If you are trying to learn how to tune I suggest you look up Evans tuning on youtube. He has some basic videos that will show you how to make fuel and ignition changes.

I looked over the datalog and its all at 0% TPS. It shows that it indeed is running lean.

Make sure you also calibrate the TPS sensor.

- Ed

Thanks for taking a look. Yes that's not something I've done - calibrated the TPS. I'll get that done - does everything else look good once I get that calibrated?

Nothing else stood out to me. I assume this log was taken at idle without the car moving. Try to get a log of part throttle.

Since it’s running lean I would add 15% fuel to all the tables. You can then dial down the fuel. It’s best to start rich and dial it down.

-Ed

This was actually driving around - don't have my speed sensor hooked up because I'm using the TSX transmission. Thank you for your help. I'll get the TPS dialed in and then go from there.

If that’s you driving around then fix the tps first and then look at your AFR. The car runs bad when you are driving it around and it thinks it’s idling.

-Ed

Ok so I adjusted TPS. The first datalog (-000) is not moving the actual TPS based on voltage - it was reading -5, and in KPRO my min TPS -5% and my max was ~60%. Drove the car and it seemed to drive decent. I added some more fuel to low and high speed = 10% for each because I noticed AFR still going in the red a good bit.

I came back and adjusted my throttle cable and the TPS sensor to where at closed to read .5V. My stock ek throttle cable won't open up the butterfly all the way with WOT. I recalibrated TPS and it put it at 9% min and ~75% WOT. I also added some more fuel to low and high speed = 10% for each because I noticed AFR still going in the red a good bit. Took it back out for a drive which is the 2nd data log (-001) and when mashing the throttle, it revs up then cuts completly out as if it's not registering any throttle, even if I press it.

I dont have the calibration from the first drive because I saved over it, but should all be the same as the 2nd but with just the different TPS calibration and 10% increased fuel for high and low speeds.

Oh also, before the 2nd attempt, I did hook up my backup lights and reverse lockout. I guess the RSX VSS isn't the same sensor plug as the TSX CSS, so I need to get a plug for that.

Just thinking as I'm looking at the different settings in kpro - could it be cutting because of the lean protection setting?

I looked over the log and the car is still running lean. When you added fuel did you make sure you added it to each fuel table? It is possible you are hitting lean protection but that is good. It's keeping you from driving the car too hard and damaging something. I suggest you add 20% fuel to all the non Vtec fuel tables. You can always dial it down later.

Side note: The car will not be able to engage Vtec until you get the VSS issue fixed or you set the vehicle speed to constant speed signal in the calibration file. When I encounter this issue with customers I set it to constant signal and once fixed I change it back.


- Ed

Thanks, Ed. I think I figured it out - I got a 18 inch piece of pipe and put that after the header, to get more space between outside air and the O2 sensor. Seems to be running great since then. I ran datalogging but didn't record.

I also swapped over an accord CSS sensor and wired it up accordingly to the CSS on the TSX transmission. Swapped to CSS driven speed sensor in misc tab and it's reading speed and gears in data log.

Speedo isn't working on the cluster, so curious if I wired from E25, which appears to be VSS Out, directly to the speedometer if that would then allow the cluster to work?

I'll data log AND record next time I drive the car in hopes it helps anyone else having really lean AFR and running open headers.

Here's a lengthy log - got a 3 inch exhaust installed today and this was on the way there. After the exhaust install, only time that the car leans out now is when I left off the gas and engine brake. Hope this helps someone if they're experiencing something similar.