AFR 10,7:1 spikes in closed loop

[retroid]

EUDM CTR EP3
Hondata K pro / PLX wideband (to ELD, wire cut, resistors removed)

my spec is:

RBC + GruppeM
KiddRacing 4-2-1 race header (decat)
BuddyClub ProSpec 65mm

The car is running fine but I have very rich spikes after changing gears or intermitate acceleration and deceleration. Is this normal in closed loop? Open loop seems fine.



I have another issue after could starts (closed loop), when I try to put very very light throttle TPS 4% the AFR goes wide lean and the car hesitate, almost stall. If I leave the pedal TPS 0%) or accelerate further the AFR turnes in to the "range"



many many thanks for help!

here are the logs:

[Spunkster]

What sensor are you running closed loop from?

[retroid]

I'm running the oem sensor (narrow band).

many thanks

[Spunkster]

post your calibration as well

[retroid]

the calibration:

[Spunkster]

Why are your MAP and TPS changing continuously?

[retroid]

on this part?




I was hitting the gas pedal, just to evidence the low AFR spikes on very fast TPS changings. Is this normal? A small amount of unburned gas hits the exhaust and generate this "short" AFR figures?

[Spunkster]

There may be spikes at throttle tip in, this is pretty normal

[retroid]

The spikes occurs during abrupt tip-out, on mine.

[Spunkster]

Has this been professionally tuned?

[retroid]

yes, on street and dyno (not by me of course) :)
car runs ok, I'm only triyng to understand the nature of these "sparks".

a better zoom look. I think there are the inertial gases resulting from the abrupt tip-out, so normal condition....

[Spunkster]

That is tuning related. Look at the short term fuel trim right before you let off and you will see that it is adding up to 14% fuel and then you suddently let off it still wants to add that fuel for a split second. I would have your tuner take a look at this.

[retroid]

sorry but I can't find that specific moment with the short fuel trim issue.
is it on the first datalog? i need to study this "to death" cause I'm confused....

many thanks for the help!

[Spunkster]

Change your graphs to show short term fuel trim and you will see it.

[retroid]

Ok! I was looking at the other datalog. the specific moment:



so, in a "perfect condition" once the TPS goes instant from 100% to 0, the S.TRIM also should decrease instantly?


I found another strange thing. I have the emissions error checking disabled (OBD II, secO2, PA , etc) but the secO2 enabled.... Is this ok?





many thanks! I started to study all the kmanager/k pro training and now I begin to understand it much better.
Thanks for posting such an important learning informations. The automotive and DIY culture in the US in outstanding!