Hondata

KManager 4.1.3.0
PRB ECU
K24/K20 swapped 2004 S2000
Magnus Sheet Metal K-Series Intake Manifold
90mm KTuned TB
KTuned FPR
Injector Dynamics 725
E85 fuel

Hello,

My issue is that I'm getting a bit of hesitation at the start of acceleration. Searched around the web and the closest I could find to my issue is in this post.
https://www.hondata.com/forum/viewtopic.php?t=17928

Looking through my logs, it shows a lean spike even though the fuel is tuned for that RPM/MAP/CAM. I suspect my issue is due to the very little throttle required to accelerate. I don't know very much about "tip in" fuel enrichment, but possibly my large TB is throwing it off? At low RPM (2K), I'm pretty much at WOT (80 kpa) if I give it 7% throttle.

According to that datalog your wideband does not look like it is reading correctly. as it really is not changing at all.

Weird. Haven't had any issues thus far with seeing my A/F. I see both the O2 sensor voltage and AF sensor values changing...

Attached is a screen shot of what I see when I look at my logs. I use AF for my lamda reading.

This isn't super important, but hoping someone could take another look at this when they can and offer a solution or explanation. I've looked at a few other datalogs posted on this this site and this doesn't look all that uncommon for those with modified motors that have increased airflow vs TPS position.

I'm not an experienced tuner, but Honda ECUs do appear to be doing some fuel enrichment / de-enrichment based on the speed in which the TPS opens / closes. I would guess this is done because MAP pressure alone won't always predict airflow into the cylinders. In the log I have attached, at 10 & 26.5 seconds, you see this period of enrichment as a spike in the injector pulse at the start of the pull. In my case however, I get a lean spike. Also, if you look between 0:06 an 0:11 seconds, you can see that when my MAP rises rapidly, I get lean spikes. Also, when it drops rapidly, it goes rich. I think this is due to small throttle movements representing a much larger increase in airflow with my setup. 25% throttle basically puts me at 0 psi.

FlashPro looks to have a way to tune this by using "Throttle flow vs opening". Is there any way to do this in KPro? I was hoping I could use the TPS scale settings and put 25% in for the max, but 60% looks to be a hard coded limit and on top of that I get a TPS over-current check engine light.