Adjusting AFR using VAFC II (Problem)
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1st off its a converter not controller (Vtec control airflow convertor) you tell the MAP if 'more' or 'less' air is going in and the ECU responds by adjusting fueling bit like a middle man.
On my car most settings are "-" to lean out however there is one point at vtec where i jumped to 13.6 AFR and i added a +1 here, it made a definite difference on the AFR the AFR dropped to 13.2
Learning over settings is a myth
, well learning over WOT settings is. Partial throttle it will learn over it being OBD2 (and looking at LTFT, STFT and o2 sensors etc being referenced). If you leave partial alone and tune it only for WOT it will not learn, as a) i have been to the dyno twice in a 5 week period after its been set and it didnt learn, secondly WOT only looks at the 'long term fuel trim' and it doesnt do any adjustments.
While its not the best not being able to adjust ignition timing and stock ECU thinking it not in vtec (grey area), it is cost effective and good for what you pay - there more scope in the fueling than ignition timing.
Kaissi, run through all your setting monitor your throttle postion (set to 80/81%) and look if the EUGO is installed and also you need to stock 02 sensor plugged in.
You current AFR in WOT are far too lean as i say 12.7 to 13.2 in WOT (MAX), somethings up for it run in 14's and 15's on WOT check your installations of mods too.
Mine was tuned on a dyno by me, with a Wideband and det cans - which is the best way if you have access to it, i paid my mate about $45 for a few hours so i loaned his dyno.
On my car most settings are "-" to lean out however there is one point at vtec where i jumped to 13.6 AFR and i added a +1 here, it made a definite difference on the AFR the AFR dropped to 13.2
Learning over settings is a myth
, well learning over WOT settings is. Partial throttle it will learn over it being OBD2 (and looking at LTFT, STFT and o2 sensors etc being referenced). If you leave partial alone and tune it only for WOT it will not learn, as a) i have been to the dyno twice in a 5 week period after its been set and it didnt learn, secondly WOT only looks at the 'long term fuel trim' and it doesnt do any adjustments.While its not the best not being able to adjust ignition timing and stock ECU thinking it not in vtec (grey area), it is cost effective and good for what you pay - there more scope in the fueling than ignition timing.
Kaissi, run through all your setting monitor your throttle postion (set to 80/81%) and look if the EUGO is installed and also you need to stock 02 sensor plugged in.
You current AFR in WOT are far too lean as i say 12.7 to 13.2 in WOT (MAX), somethings up for it run in 14's and 15's on WOT check your installations of mods too.
Mine was tuned on a dyno by me, with a Wideband and det cans - which is the best way if you have access to it, i paid my mate about $45 for a few hours so i loaned his dyno.
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From: Coto De Caza
Originally Posted by Irvatron,Dec 17 2009, 08:00 AM
1st off its a converter not controller (Vtec control airflow convertor) you tell the MAP if 'more' or 'less' air is going in and the ECU responds by adjusting fueling bit like a middle man.
On my car most settings are "-" to lean out however there is one point at vtec where i jumped to 13.6 AFR and i added a +1 here, it made a definite difference on the AFR the AFR dropped to 13.2
Learning over settings is a myth , well learning over WOT settings is. Partial throttle it will learn over it being OBD2 (and looking at LTFT, STFT and o2 sensors etc being referenced). If you leave partial alone and tune it only for WOT it will not learn, as a) i have been to the dyno twice in a 5 week period after its been set and it didnt learn, secondly WOT only looks at the 'long term fuel trim' and it doesnt do any adjustments.
While its not the best not being able to adjust ignition timing and stock ECU thinking it not in vtec (grey area), it is cost effective and good for what you pay - there more scope in the fueling than ignition timing.
Kaissi, run through all your setting monitor your throttle postion (set to 80/81%) and look if the EUGO is installed and also you need to stock 02 sensor plugged in.
You current AFR in WOT are far too lean as i say 12.7 to 13.2 in WOT (MAX), somethings up for it run in 14's and 15's on WOT check your installations of mods too.
Mine was tuned on a dyno by me, with a Wideband and det cans - which is the best way if you have access to it, i paid my mate about $45 for a few hours so i loaned his dyno.
On my car most settings are "-" to lean out however there is one point at vtec where i jumped to 13.6 AFR and i added a +1 here, it made a definite difference on the AFR the AFR dropped to 13.2
Learning over settings is a myth
, well learning over WOT settings is. Partial throttle it will learn over it being OBD2 (and looking at LTFT, STFT and o2 sensors etc being referenced). If you leave partial alone and tune it only for WOT it will not learn, as a) i have been to the dyno twice in a 5 week period after its been set and it didnt learn, secondly WOT only looks at the 'long term fuel trim' and it doesnt do any adjustments.While its not the best not being able to adjust ignition timing and stock ECU thinking it not in vtec (grey area), it is cost effective and good for what you pay - there more scope in the fueling than ignition timing.
Kaissi, run through all your setting monitor your throttle postion (set to 80/81%) and look if the EUGO is installed and also you need to stock 02 sensor plugged in.
You current AFR in WOT are far too lean as i say 12.7 to 13.2 in WOT (MAX), somethings up for it run in 14's and 15's on WOT check your installations of mods too.
Mine was tuned on a dyno by me, with a Wideband and det cans - which is the best way if you have access to it, i paid my mate about $45 for a few hours so i loaned his dyno.
My stock o2 sensor is not plugged in.. it's isolated ... I use to have it in a non-fouler connected to the testpipe to eliminate CEL.. now since I wanted to install the wideband sensor.. I removed the stock O2 sensor with the non-fouler, and I close the non-fouler.. so the o2 sensor is now sealed in it.. hanged underneath the car and tight somewhere not to fall... inside the testpipe is the Wideband sensor..
COULD THAT BE THE PROBLEM ?
my mods have nothing to doubt about.. AEM V2 is been set long time ago and was fine ... headers also is a straight forward task.. that is also applied to testpipe and exhaust few screws and gaskets and your done..
VAFCII.. I got it with harness...not to go into wrong wiring.. I just plugged it.. and it was on...
UEGO as well.. one cable to the sensor.. the other cable (black and red) ground and 12v from the battery.. didn't put the fuse.. I'm going to do so this time not to take a risk of having a short circuit and ruining the device..
Do you suggest taking off the VAFCII and plug back the stock ECU and watch the AFR again ?!?
But I think once VAFCII is initialized ..it's like stock ECU is doing the job alone..no?!?
Now what I got from you is that I should do partial throttle settings to have effect on WOT too!??!?! Then that's my problem because all my partial settings are not set yet...
According to the videos..can you suggest any settings?? briefly.. to try them...
Joined: Jan 2006
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From: location, location
Well as far as i know some o2 sensors can be used for monitoring and for the car (dual).
Did you plug anything into the small harness that plugs into the primary 02 sensor one before CAT?, the cars's ECU needs to get feedback from an O2 sensor for fueling, namely your stock o2 sensor unless the EUGO one plugs into the stock harness.
No DO NOT set any adjustments on the partial throttle corrections (leave it alone, only do WOT), so leave alone., TBH though i cant remember the names for partial throttle is it LVT?. Personally from what you say you should have the EUGO plugged in and stock O2 sensor plugged in.
I used clamp in removal sensor on the tailpipe for reading my AFR on the dyno, but with your setup its different on my car for example my tracysports manifold has a bung for the stock o2 sensor and another bung for monitoring so the eugo o2 sensor would go in the other bung, so 2 plugged in.
Did you plug anything into the small harness that plugs into the primary 02 sensor one before CAT?, the cars's ECU needs to get feedback from an O2 sensor for fueling, namely your stock o2 sensor unless the EUGO one plugs into the stock harness.
No DO NOT set any adjustments on the partial throttle corrections (leave it alone, only do WOT), so leave alone., TBH though i cant remember the names for partial throttle is it LVT?. Personally from what you say you should have the EUGO plugged in and stock O2 sensor plugged in.
I used clamp in removal sensor on the tailpipe for reading my AFR on the dyno, but with your setup its different on my car for example my tracysports manifold has a bung for the stock o2 sensor and another bung for monitoring so the eugo o2 sensor would go in the other bung, so 2 plugged in.
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From: Coto De Caza
LVT: When Low cam lobes are used (i.e before cross over ),
HVT: High cam lobes are used
Both can be set on Wide and Narrow throttle..
I'm only setting up wide..as you said..
but what I don't understand is.. if I plugged 2 sensors or the wideband alone in the testpipe.. UEGO reading should not be affected... has nothing to do with the stock O2 sensor?!?!?
HVT: High cam lobes are used
Both can be set on Wide and Narrow throttle..
I'm only setting up wide..as you said..
but what I don't understand is.. if I plugged 2 sensors or the wideband alone in the testpipe.. UEGO reading should not be affected... has nothing to do with the stock O2 sensor?!?!?
Joined: Jan 2006
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From: location, location
I'm getting a bit confused 
You need an o2 sensor in for sure its used for fueling, what i am asking is.
As stock, the car has 2 o2 sensors one BEFORE and one AFTER the cat, the one after is just used to check the CAT is working, in my car i dont have a CAT (a use a testpipe) so i leave the o2 sensor before the CAT in, but the one after the CAT i put an anitfouler in to move it upwards slightly - both are plugged in.
1) Have you disconnected the stock 02 sensor (one before CAT) so its not getting used.
2) Is the EUGO o2 sensor plugged into the same place where you removed the stock o2 sensor, is it plugged in before or after the CAT.
3) Is the EUGO plugged in the stock o2 sensor harness?
4) Are you saying you have the EUGO plugged in after the CAT and the stock ECU o2 sensor before the CAT still plugged in?
Ideally you should have your stock o2 sensor plugged in and the eug plugged in another hole.
Unless the eugo can carry out monitoring and replace the stock o2 sensor, in that case using the stock harness.
Do you have a CEL light?
You need an o2 sensor in for sure its used for fueling, what i am asking is.
As stock, the car has 2 o2 sensors one BEFORE and one AFTER the cat, the one after is just used to check the CAT is working, in my car i dont have a CAT (a use a testpipe) so i leave the o2 sensor before the CAT in, but the one after the CAT i put an anitfouler in to move it upwards slightly - both are plugged in.
1) Have you disconnected the stock 02 sensor (one before CAT) so its not getting used.
2) Is the EUGO o2 sensor plugged into the same place where you removed the stock o2 sensor, is it plugged in before or after the CAT.
3) Is the EUGO plugged in the stock o2 sensor harness?
4) Are you saying you have the EUGO plugged in after the CAT and the stock ECU o2 sensor before the CAT still plugged in?
Ideally you should have your stock o2 sensor plugged in and the eug plugged in another hole.
Unless the eugo can carry out monitoring and replace the stock o2 sensor, in that case using the stock harness.
Do you have a CEL light?
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From: Coto De Caza
Originally Posted by Irvatron,Dec 17 2009, 09:30 AM
I'm getting a bit confused
You need an o2 sensor in for sure its used for fueling, what i am asking is.
As stock, the car has 2 o2 sensors one BEFORE and one AFTER the cat, the one after is just used to check the CAT is working, in my car i dont have a CAT (a use a testpipe) so i leave the o2 sensor before the CAT in, but the one after the CAT i put an anitfouler in to move it upwards slightly - both are plugged in.
1) Have you disconnected the stock 02 sensor (one before CAT) so its not getting used.
2) Is the EUGO o2 sensor plugged into the same place where you removed the stock o2 sensor, is it plugged in before or after the CAT.
3) Is the EUGO plugged in the stock o2 sensor harness?
4) Are you saying you have the EUGO plugged in after the CAT and the stock ECU o2 sensor before the CAT still plugged in?
Ideally you should have your stock o2 sensor plugged in and the eug plugged in another hole.
Unless the eugo can carry out monitoring and replace the stock o2 sensor, in that case using the stock harness.
Do you have a CEL light?
You need an o2 sensor in for sure its used for fueling, what i am asking is.
As stock, the car has 2 o2 sensors one BEFORE and one AFTER the cat, the one after is just used to check the CAT is working, in my car i dont have a CAT (a use a testpipe) so i leave the o2 sensor before the CAT in, but the one after the CAT i put an anitfouler in to move it upwards slightly - both are plugged in.
1) Have you disconnected the stock 02 sensor (one before CAT) so its not getting used.
2) Is the EUGO o2 sensor plugged into the same place where you removed the stock o2 sensor, is it plugged in before or after the CAT.
3) Is the EUGO plugged in the stock o2 sensor harness?
4) Are you saying you have the EUGO plugged in after the CAT and the stock ECU o2 sensor before the CAT still plugged in?
Ideally you should have your stock o2 sensor plugged in and the eug plugged in another hole.
Unless the eugo can carry out monitoring and replace the stock o2 sensor, in that case using the stock harness.
Do you have a CEL light?
I use to have the secondary one plugged in anti-fouler then testpipe for CEL issue...
now I took off the secondary O2 sensor, with the anti-fouler together..sealed them both, it is still connected to its original secondary O2 sensor harness...and so far no CEL on...
the wideband O2 sensor is connected directly to the UEGO gauge.. plugged in the testpipe where the secondary O2 sensor was ....
Summary
1 - Primary O2 in the header where it should be
2 - secondary O2 sealed within the anti-fouler hanged alone still connected to its original harness ... (Not in the testpipe anymore)
3 - wideband O2 sensor connected to the gauge only.. placed in the testpipe in place of the secondary stock O2 sensor .. so the testpipe now has only wideband sensor in it..(1 hole)
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From: Coto De Caza
Does it really make sense to need to correct to high posivite % in fuel ??!!? I never saw someone doing so at least !!
How can it be that lean by only having AEM V2, 63mm headers, Invidia 70mm testpipe and exhaust (single tip)
How can it be that lean by only having AEM V2, 63mm headers, Invidia 70mm testpipe and exhaust (single tip)
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