need some help adding fuel

[c5mtl]

hello....im new here and need some help adding some fuel in my tune....it seems my tuner has left me out to dry!!! but that's a whole other story...car is 99 c5 auto with a ysi and a 3.1 pulley with 8 inch crank and 2 meth nozzles and a 2 bar sd tune ....the car used to have a t trim on it but due to some bad decisions on the pulley size the blower overspun by about 13000 rpm and the impeller went to hell. So I decided to get a ysi and keep the boost down...car makes about 16psi at the top of 2nd but the wide shows a bit lean....im hoping to stay with this 2 bar tune for now but I do realize I should go to a 3 bAR....I pulled a bunch of timing out to try and keep it safe for now... I know I need to add some fuel....I have attached logs and the tune
thx in advance for any help






99 a4 2800 coan ,forged 383,rpm level 5, 225 tfs heads, blower cam,ysi ,flip drive ,3.42,tsp headers,

[fullthrottle]

Your car was tuned by Arun?

[fullthrottle]

to me its on the lean side when you go WOT. how does it feel power wise?

[c5mtl]

feels fine even with only 9*....I know its a little lean even with meth....tune was setup for a t trim

[fullthrottle]

you have to tell the computer that you now have a more efficient blower. you do this by telling the VE table that your engine is more efficient now. when you do that the VE will light a fire under the asses of your fuel injectors.

ok so here's how you do this.

there's 2 ways (for the most part) to control fueling on your 2 bar OS one is the main VE table and the other is power enrichment (which we will get into in a bit)

so what you need to do is create a histogram that logs VE AFR Error percentage. once you do that go and do some driving/data logging. take the car and just drive normal try to stay out of boost for the time being. once you populate as many cells as you can your going to stop scanning and save your log file. go into the log file and into the VE AFR Error histogram and ensure it is set on average count (the A in the top right of the window). Copy the histogram you just recorded, open your tune and go to the main VE table. left click on the empty box on the left of the main VE table (this will highlight the table in all blue) then right click and select multiply by percent. save your tune as a new file (DO NOT SAVE OVER YOUR CURRENT TUNE) save it as something else so that you always have the tune you started with. load tune on vehicle and go out for more data logging. repeat process until your error is 5% or less. this shouldn't take you long for the part throttle stuff in your tune because based on what I can see your error is very close (in fact looking at it now if it was me, id leave it alone) however it can still be tweaked slightly if you must. then do the same as above for WOT. don't worry about your PE table as it is set correctly (hes got you at a very safe 11.1 : 1 across the board when in PE) its the VE that appears to need some work At WOT.

KEEP THIS IN MIND ALL OF THIS IS MY ASSUMPTION THAT YOUR WIDEBAND IS WORKING CORRECTLY AND THE VOLTAGE OFFSET ISNT WACK. Sorry, im not yelling lol

[c5mtl]

you have to tell the computer that you now have a more efficient blower. you do this by telling the VE table that your engine is more efficient now. when you do that the VE will light a fire under the asses of your fuel injectors.

ok so here's how you do this.

there's 2 ways (for the most part) to control fueling on your 2 bar OS one is the main VE table and the other is power enrichment (which we will get into in a bit)

so what you need to do is create a histogram that logs VE AFR Error percentage. once you do that go and do some driving/data logging. take the car and just drive normal try to stay out of boost for the time being. once you populate as many cells as you can your going to stop scanning and save your log file. go into the log file and into the VE AFR Error histogram and ensure it is set on average count (the A in the top right of the window). Copy the histogram you just recorded, open your tune and go to the main VE table. left click on the empty box on the left of the main VE table (this will highlight the table in all blue) then right click and select multiply by percent. save your tune as a new file (DO NOT SAVE OVER YOUR CURRENT TUNE) save it as something else so that you always have the tune you started with. load tune on vehicle and go out for more data logging. repeat process until your error is 5% or less. this shouldn't take you long for the part throttle stuff in your tune because based on what I can see your error is very close (in fact looking at it now if it was me, id leave it alone) however it can still be tweaked slightly if you must. then do the same as above for WOT. don't worry about your PE table as it is set correctly (hes got you at a very safe 11.1 : 1 across the board when in PE) its the VE that appears to need some work At WOT.

KEEP THIS IN MIND ALL OF THIS IS MY ASSUMPTION THAT YOUR WIDEBAND IS WORKING CORRECTLY AND THE VOLTAGE OFFSET ISNT WACK. Sorry, im not yelling lol

thx for that.....how about the timing...leave it or move it up??

[fullthrottle]

You can leave it for now. It don't seem to be knocking.

[danieloneil01]

I would get the fuel right before adjusting the timing. When you do, do it 1* at a time.

[fullthrottle]

I agree Daniel, His tune is pretty close. (with in reason) He's basically just upgraded his supercharger from a T Trim to a YSi. However, he's slightly lean all across the board. That don't make sense to me, I'm wondering if his wideband is possibly off.

[c5mtl]

I will recalibrate it before I go out again....I am using the setup built into hp tuner for the ngk afx.....maybe something is off?

[danieloneil01]

Don't know as we can't see the gauge and what it's reading to compare it to what hptuners is showing. You can command a AFR just idling to compare it. Another way is to take out the WB from the exhaust and see what it reads in air then compare. Then take a towel or rag and put a little bit of gas on it then wrap the O2 in the rag and compare it.

I tried using the built in config for my AEM gauge but it was way off. I did a bunch of trial and error. Even the spreadsheet that you plug in the info didn't get it just right.

[c5mtl]

I was wondering if somebody could look at my knock sensor tip in settings...it seems they are set way different than other tunes.....already had an issue in the past with a tuner changing the setting which basically turned them almost off(cost me a motor)....would rather have a more sensitive setting than less

thx