It does actually sit at 14.7 at idle (well before I installed the pump) but just goes rich when I pass a certain load point. I position the WB in the rear o2 location 16inches away from the hotside which cant be less the 6in or more then 36in according to the instructions. I got it for starters to make some sense of whats going on when I swapped over injectors.

I put in the Walbro just to make sure I have good pressure.


I uploaded a video just to show what its doing at Idle. This is maybe the 3 start up after I installed the pump. just not sure where to go next.

 https://youtu.be/eMyhB533kO0

I just got back after that pump install, it did some good.

It was right where I wanted it in all areas except WOT. I want to say open loop but cant really back that up at the moment beside monitoring the actual and the way it felt...   

That sounds like a boost leak



that makes zero sense. That has literally nothing to do with your fueling problems.

Im back on my journey to try to figure out the rich condition @ WOT that i was having. I ended up installing my bigger turbo setup cause I figured my problem was rich so why not. plus I figured I might as well have everything set up for this setup..

excuse my ignorance as im still trying to get an understanding dialing in fuel.

So I started where I left off with the 550cc, 255lph all on 3bar just a bigger turbo. KRKTE @ 0.0811 and TVUB set to run Stoich @ idle and PT to follow accordingly. Of course everything is good till I go WOT, then its rich city (10.0 and beyond).

I took a glance @ my trims at the time via VCDS (32 & 33) to find 32 is -25% and 33 is climbing to +17%. So I got to thinking its a lean condition so let me throw some fuel at it via KRKTE. Changed values to 0.0768 let it adapt than things start to look WAY better. Idle and PT still the same but WOT is now starting to hold at 11.5 and I can finally get it all the way thru a gear without it breaking up.

So im like ok, I might finally be getting somewhere BUT I pull up my trims and 32 still eventually gets to -25% (my guess is the limit) but now 33 waves between -1 and +1%, thats where I want to be right? (as solely for STFT)

I know everybody's thinking boost leaks. I spent a day trying different methods with carb spray, compressed air and I even let it smoke for 30mins and sealed every little thing I could find (2 spots) and Vac @-23hg. I was than thinking my 02 maybe going up but its reading and its not even used in open loop, right? Now im starting to point my fingers at the MAF but there no evidence (as far as I know) its faulty other then it'll hesitate alittle sometimes holding it steady @ a certain load point..


Sorry for writing a chapter and my noobish ways but im just still trying to figure this out. This is a short log that I manged to get in traffic and boost looks crazy cause Im running it off spring pressure for now (hence the fault), I figure I get fueling right before working on boost

Iirc krkte for 550s about 0.05x

There is something completely wrong with your hw if you run it with 0.08

And again
Absolutely stupid idea to tweak narrowband on a custom hw when you have an option to go wideband for a few bucks

Decide to jump back on my pig rich condition at WOT and I think I solved it.. I ended up putting my maf sensor in a 3inch housing, scaling it thru maf adjust, centering LTFT @ PT down to -3.6% (so far) and STFT dead @ 0% as long as I can look at it while moving. Now WOT AFR's are exactly how I want them going from 12.8 majority of the time and tapering down to 11.8 by redline. Never felt it run this way since the new setup

It dose hesitate slightly tapping on the ped at a light and was thinking I should fix it thru TVUB but STFT's are both zero and idle is at Stoich soo not sure which area to smooth it out in.