Hondata

Im currently working on the fuel system to get prepared for prls new turbo soon. After installing dw300 pump (i lalso still have to install the hpfp by xdi) i noticed on the way home at idle my lt fuel trims were sitting around 3.91. So decided to datalog and it seems like the fuel trims are jumping around quite a bit.

Current mods

PRL HIVI
PRL Intercooler and piping
PRL Titanium inlet pipe
PRL Catted exhaust
AWE Exhaust w/ revised mid pipe
DW300 fuel pump

Current tune ran is base map for prl dp and intercooler with prl hivi checked
I dont see how an intank pump can cause this but any insight would be great

heres a 3rd gear pull at wot. looking at this everything seems to be stable. Am i just over thinking this?

Can you point out a timestamp in either datalog where you feel like they are jumping around? They seem pretty steady to me. What about a datalog before the pump install, do you have one we can compare before and after the pump?

theres a chance i might be over thinking it. Also the possibility that the hondata dash app is glitching more making me think to much on it. On this data log tho the lt fuel was mainly negative which would lean towards more rich conditions if im getting this correct, where now with the dw pump its more towards positive which would mean more lean. Once again this could be something im just over thinking i do appreciate the response and looking into it tho.

Funny you mention the app glitching, I was doing some logging today myself and the knock count was flickering between 7 and 8 knock at one point when I was looking at it. Literally just sitting there flickering between 7 and 8. So maybe that is part of what you saw.

Comparing the two datalogs, the injector pulse has changed at idle from about 1.04 in the old datalog to .84 or so in the new datalog. That reduction in pulse could be part of the issue. Though your intake temps in the new datalog are about 20*f higher than the old datalog, if the intake temp fuel compensations aren't set properly it can cause this by pulling too much fuel and then it goes slightly lean at idle, so the fuel trims try to add fuel. Full disclosure, I don't do a lot of 10th gen tuning, and I don't do FK8 stuff, so my assessment is purely based on how this stuff works on older ECUs and my little experience with 10th gen. Looking at your tables though, you are pulling data at idle from different air temp columns within your tune between the two datalogs, therefore I would say the change in idle fuel trims has changed more for intake temps drawing their fueling data from different cells than your fuel pump swap. The idle trims were definitely smoother in the old datalog, but because the air temps are 20*f different, I can't say 100% your fuel pump is causing your issue. I would highly doubt it would cause an issue honestly, but you never know on these cars. Either way though, your trims are still within a couple percent which is great. Though your old datalog was dead on.

Do you plan to get dyno tuned at some point by someone who is knowledgable with FK8's??

Hopefully the Hondata boys will chime in when they get on here this weekend or Monday and give you some in depth analysis.

Back to the OP, the fuel trims in the datalog are normal.

It will be getting tuned again by d rob here after the new turbo insatll