Hi All,

I've playing around here for a while and tuning my own car just for fun. This weekend I'm trying to tune fueling right since I'm running lean.
It's a 1.8T with stock 317cc injectors plus a 4,5bar fpr. I'm running a k04/e05.

I've been playing with KRKTE, TVUB and FKKVS.

First, I managed to get the right KRKTE value, since my fuel (here at Brazil) isn't pure gas, it's a mixture = 75% gas + 25% ethanol. This value is 0.08314. Idle seems to be fine with this value.
I just 1'ed entire FKKVS and tried to tune it on the areas I need it. But the results is: I need to increase FKKVS areas to like 1.30 past 3000 rpm to get LambdaControlAvg near 1.0. Is this right?!?

I just multiplied entire TVUB by 15% (I read here that when you increase FPR you increase the injectors lag).

The symptom that I cannot figure out how to fix is: LambdaControlAvg is correcting the fueling, and at 4250RPM the car start to go lean no matter what I change.
First tried with stock 3bar fpr, then 4bar fpr, then 4,2fpr than this 4,5fpr. Even with more pressure the symptom  is the same: past exactly 4250RPM the car starts to lean out. Why? I sincerely have no idea where what maps to change to fix this out.

Question: is my injectors still little for this setup and no matter what FPR I use the results will always be the same?

Thanks for the help.
[]s

Fuel pump is stock? How many miles does it have?
Attach logs to check pls.

Please see attached log. Only a 2th gear pull.
Filter 2th gear, 4500 minimun run on ECUxplot and you'll see what I'm talking about.

@kenmac: I'll buy deka's 630cc for it, but for now I'm trying to understand things before start buying parts

Yeah, my pump is stock. The car has 40k miles.

Attached another log I did now. You can see a 3rd pull and a 5th gear pull. Now I did this pull with 95 octane gas (Brazilian Podium) but the gas still has 25% ethanol on it, so the octane is higher than this but the consumption a little higher too.

What do you recommend professor? New injectors and a new pump too?