Guys,
I got the UEGO installed, as well as the VAFC II
When all corrections are set to 0...
the car is reaching high 14's and high 15's on WOT....so apparently I did few runs, and tried to add fuel +positive correction, and here's the problem I faced

I was not able to decrease all the AFR across the whole RPM range... and I did so by setting the corrections to +20 and 30... and on LVT .. at around 4000-5000 I reached +50 which is the maximum, and I was barely able to put it down to 14.3 ... what's wrong with the car ?!?!! Is it a bad UEGO or bad VAFCII ?!! or bad car...

I didn't change VTEC cross over.

We don't have dyno here, nor good tuners..

I have 2004 EDM AP1 F20C2.... AEM V2 installed, headers 63mm, 70mm invidia testpipe.70 mm exhaust invidia N1 single tip

I taped the UEGO near the VAFCII monitor (RPM and correction) to relate them together..

notice that in the second video, even after reaching +40 correction, still barely making low 14s. I only focused on LVT second video.

First video (Run #2)[media]http://www.youtube.com/watch?v=8ifhnOv9U2A [/media]

Second video (Run #10) focusing on LVT only[media]http://www.youtube.com/watch?v=2JPAnQpIZ_k [/media]

 

are you getting the 14.3 from the wideband?

 

Yes.... if you can check the videos...that's the UEGO...connected to its wideband sensor in the testpipe...

 

I understand that you can not add fuel with this, only subtract from the map. Atleast thats what tuners and most members have told me.

 

If youre not boosted, the Uego looked ok to me. Looked like a 12.7 under WOT up top and thats fine for a NA car.

 

I just tuned my recently but its an 00 with inktake vafc and testpipe. First couple of runs I was around mid to low 13 until vtec hit and after 8000 when it dropped to 11.

Remember as the car gets hotter, those numbers will drop(A/F). So be sure you tune it with giving the car a break, like a 2-3 minute break between runs to get a constant numbers to be able to tune properly.

But from what your saying, think your wideband is not accurate.

 

Kyushin : Well yes.. between 8000-9000 it dropped to 12 even 11.5... but the thing is.. probably because the AEM V2 is putting a lot of air.. I opened the bumper in the front, so the wind is blowing really big in it.. and I have 63 headers, 70 mm testpipe and 70mm exhaust.. + cold air.. the weather is cold now.. so I guess the airflow is fast and huge.. so ..probably it make sense to have such ratio..however.. I didnt' know that VAFCII cannot add fuel!?!?!what's the use then ?!?

Rikhemi ::UEGO seem to be fine..on idle..it's giving 14.7-15...which I heard is normal...
there is no room for error for the uego I guess.. it's a sensor.. was brand new.. and a cable..

 

Ya, I have heard alot that it can not add fuel, only subtract and can suffer from detuning issues over time. I have heard arguments in both directions so who knows.

 

If its working properly, cant imagine with those mods it still running at over 14 and 15 through out the power band.

By chance was the engine cold(meaning right when you hit 3 bars you did the dyno). Thats the only other thing I can think of.

What did you dyno at anyways. Didnt see a graph?

 

No dyno in here I'm in Lebanon the whole country is as big as Orange County and LA
no good tuners available too...

I got emanage with the harness ..but I read setting it up is not very easy.. so I figured I start with VAFCII.. cause so far I will not worry about ignition timing and stuff..only AFR.... I don't have FI yet.. so AFR should be fine.. I guess....

no I was sure that the car is warm to its normal temp which is what maybe 6 bars??

and when I tested it.. I put Full throttle...eventhough I just noticed the VAFC II initial setup is 10% narrow and 50% wide, but I don't think it will make any difference, I was flooring it...
and my corrections are done on Wide LVT and HVT..
the thing is I see small difference but very small..like I add fuel from 0-20 to notice a small decrease in AFR... so that's why..places where it's 15.5 or something.. even +40 will barely make it to 14.8
It seems like as Kyushin said, VAFCII cannot add enough fuel.. trimming maybe is what you can really manipulate...
but.. the thing is ... with no setup of VAFC..the car reaches high 15's and I saw once maybe 16.0... so.. is this normal.. with these mods.. like it seems whoever install such mods.. has to tune for sure.. it's not an option only to get more HP.. it's a must to protect the engine..