Stuttering during acceleration

[leechihfei]

Hi Hondata,

I have been feeling what seems to be engine stuttering - can't build power when engine is passing around 5,000 rpm & 1.4bar+ (21psi).

My FK8 is a 2018, with G25-550 turbo (just changed from a G25-660) , PRL exhaust, Cat back exhaust, PRL intercooler, Radiator upgrade, Hondata Fuel upgrade, etc.

The dyno runs were fine. The symptoms were noticed a day later on the highways and on track. Plugs were checked and still changed, coil was also changed, to no avail.

Looked at the data log, fueling is fine too. The stuttering feels like a soft power cut, unable to build revs, burbles from exhaust but only when boost is climbing to around 1.4bar+.

Part throttle with boost below 1.3bar, allows regular acceleration.
Attached datalogs, for your kind assistance and analysis.

[Spunkster]

Post the calibration the datalogs were made with.

[leechihfei]

Thank you Spunkster for looking into it - this has stumped me!
Calibration attached.

[Hondata]

AF and trims are not right. 16:1 under boost will misfire. Large positive fuel trims. A lot of variation in the lambda readings.

We can diagnose further from the datalogs because many, many error codes have been disabled. So if there is a problem there is no way of knowing that. You cannot disable errors like primary o2 sensor heater and then expect the ECU to be able to control the lambda.

Put all the DTCs back to exactly stock and then see what flags as a problem.

[leechihfei]

Noted on your points.

Strangely, I have never deactivated any DTCs, and always only change the tables that I need changed.
However, now when I reference to the stock calibration, I see some distinct differences.

My Calibration also doesn't have same quantity & type of DTCs.
NA - Not available (in my Map)
Checked - Box checked
Unchecked - Box Uncheck

The differences are shown below:

DTC / My MAP / Stock Map
P0148 / NA / Unchecked
P0191 / Checked / Unchecked
P026B / NA / Checked
P0299 / NA / Checked
P02CC/ NA / Checked
P02CD/ NA / Checked
P02CE / NA / Checked
P02CF/ NA / Checked
P02D0 / NA / Checked
P02D1 / NA / Checked
P02D3 / NA / Checked
P0300 / NA /Checked
P0301 / NA /Checked
P0302 / NA /Checked
P0303 / NA /Checked
P0304/ NA / Checked
P0420/ NA / Checked
P0442 / NA / Checked
P0449 / NA / Checked
P0451 / NA / Checked
P0452/ NA / Checked
P0453 / NA / Checked
P0455 / NA / Checked
P0456 / NA / Checked
P0461 / NA / Checked
P0462 / NA / Checked
P0463 / NA / Checked
P0496 / NA / Checked
P0497 / NA / Checked
P0498/ NA / Checked
P04F0 / NA / Checked
P0501 / NA / Checked
P0506 / NA / Checked
P0507/ NA / Checked
P050A/ NA / Checked
P050B/ NA / Checked
P053F/ NA / Checked
P0557 / NA / Checked
P0558 / NA / Checked
P0560 / NA / Checked
P0606 / 8 only / 8 checked, 1 Unchecked
P0835 / NA / Unchecked
P15C5/ NA / Unchecked
P15C7 / NA / Unchecked
P15C9 / NA / Unchecked
P1703 / NA / Unchecked
P2096 / NA / Checked
P2097 / NA / Checked
P2182 / NA / Checked
P2183 / NA / Checked
P2195 / NA / Checked
P2196 / NA / Checked
P2199 / NA / Checked
P219C / NA / Checked
P219D / NA / Checked
P219E / NA / Checked
P219F / NA / Checked
P2270 / NA / Checked
P2271 / NA / Checked
P2279 / NA / Checked
P2422 / NA / Checked
P2563 / NA / Checked
P2564 / NA / Checked
P2565 / NA / Checked
P2610 / NA / Checked
U0131/ 6 only / 6 checked, 3 Unchecked
U0151 / 7 only / 7 checked, 4 Unchecked

So what is my course of action now ?
(I would like to reiterate that I have never de-selected any of the DTCs before, and no one else touches my tunes)

Thank you again.

[leechihfei]

Some I missed earlier....

Those that are different in my MAP, when compared to the Stock Map are as follows:

NA - Not available (in my Map)
Checked - Box checked
Unchecked - Box Uncheck

DTC No. / My MAP / Stock Map
P0136 / Unchecked/ Checked
P0138 / Checked / Unchecked
P0139 / NA / 3 Unchecked, 1 Checked
P0141 / Unchecked/ Unchecked
P0141 / Unchecked/ Checked
P0141 / Unchecked/ Unchecked
P0171 / NA / Unchecked
P0P0171 / NA / Unchecked
P0172 / NA / Unchecked
P0172 / NA / Checked

____________________________________________

In summary:
Only 2 DTCs - P0136, P0141, were not checked in my MAP, when compared with STOCK.
And 2 DTCs were selected - P0138, P0191, where the Stock Map had them deselected.

In regards to "AF & Trims are not right" -
My MAF had been calibrated.

Which other areas should I be looking at? Looking forward to your advice.