i tried searching and came up with nothing, what exactly is the obd2 workaround , and how does it benefit a lude, i know obd1 is better for modding, can anyone shed some light on this please
thanks

 

http://www.ntpog.org/mods/fifth-afc/ecu.shtml

I don't really feel it's worth the trouble.

 

it keeps your ecu from resetting, and going back to stock settings, obd-II is a good mod, im going to do it in 2 weeks

 

I did it, and to be honest with you a felt nor saw any gain from doing it. All it does is resets the ECU's memory. Thats it, nothing more.......

 

No need to do a "work around" if you tune it the right way. OBD II does NOT change your fuel map or VAFC settings as long as you tune for full throttle only.

What OBD II does is try to keep your air to fuel ratio (A/F) at 14.7 under normal driving conditions. 14.7 is the best ratio for emmitions and fuel consumption. The way it does this is it monitors your primary O2 sensor and if it’s not at 14.7 it will trim the fuel level until its reached 14.7. Thus if your car is running at 13 A/F it will adjust the fuel map until it’s back at 14.7.

It however does NOT try to keep A/F at 14.7 when at full throttle!! Under full throttle the ECU ignores the reading from the primary O2 sensor and does NOTHING to try to trim the fuel. In fact hondas are set in stock form to run rather rich under full throttle and not at 14.7.

Knowing this we can tune the VAFC in such a way that it will not be “detuned” by the ECU. Don’t set the VAFC to do anything under part throttle because that will though off what the ECU is trying to do. What’s the point of trying to get anything other than 14.7 at part throttle anyway?? If you want more power just push the throttle down more! You can set the Apexi VAFC to only adjust fuel at 90% or more throttle. This will give you max power at full throttle and the ECU will not try to “detune” it.

Basically let your ECU do the A/F tuning for part throttle (it does a good job of that), and you do the tuning under full throttle via VAFC.

 

^^^ that sounds like a good plan... can anybody confirm this ???

 

I can confirm it.

I have an obd2 scanner. I watched my fuel trim from several months after I tuned in the fuel settins with VAFC. I tuned for max power at WOT on a dyno. After months of watching the fuel trim values they did NOT change, thus the ECU is not trying to "undo" my work.

The key is to only tune for 90% or more throttle. why others don't do it this way is a mistory to me. *shrug*

 

I, too, can confirm this, I also have an OBDII scanner. Cutting power to the memory does reset the Long Term Fuel Trim, but it recalibrates in the first 20 minutes of driving. As long as the changes you make with a fuel controller are for WOT (open loop), they will not affect your LTFT, as LTFT is figured from Short Term Fuel Trim, and STFT is only active during low load (closed loop). The "workaround" is worthless, don't waste your time.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 577HondaPrelude &raquo;</TD></TR><TR><TD CLASS="quote">I can confirm it. </TD></TR></TABLE>

hahahah nice

Wasn't questioning authority. Just making sure you know? I'll be getting the SMSP so once production starts, I'll be installing my VAFC. I was also considering the workaround while I was down there, but read enough on it to not want to do it. I just wanted to make sure that's the way to do it with the VAFC. Thanks for the help. Very much appreciated.

-Jeremy

 

thanks guys for all the responses, doesnt seem like anything i really need to be doing , just was curious on what it yeilded , thanks again

 

hmm why don't we get marcucci and the kids to remove it from the ntpog site then?