I have been searching and reading for hours now and have developed many questions. Most of them seem to be about wbo2 tuning and none of the stickies reference how to tune with a wideband. I'm not talking about how to datalog the wideband readings, which is very handy, but that is the only thing in the stickies about widebands and it has to deal with changing source code to read the 0v - 5v signal that it uses.

I keep asking and searching questions about tuning ve at idle, part throttle, and wot. Also about tuning ae and pe. There always seems to be some very good responses and one of which is to check the stickies. Problem is that the stickies only talk about adjust everything except wot, via the stock narrowband (nb) sensor and reading the blm values that the ECM calculates based on it's voltage. My question is WHY? I'm not saying it is wrong in any way, I just don't understand why noone trusts a wbo2 sensor to tune all aspects of fuel, but instead they rely on the nb sensor which is essentially a switch.

I've seen numerous threads in which several people are very confused because they get their blms perfectly to 128 and when they plug a wbo2 sensor in, they are running VERY lean........the blms read 128 which is a theoretic 14.7 afr (stoich), but the wb is reading 17:1 afr. Then the thing that gets me is that they trust the blms produced by the nb, over the TRUE afr values given by the wideband. (TRUE is only true if smog equipment is removed and not putting more o2 into the exhaust stream giving a false lean condition).

I am not saying this is wrong, again, it just doesn't make sense to me. I know that the ECM is made to use these blm values without any problems, but is that true with a modified motor......larger cams, more efficent heads, less exhaust restriction, larger volume of air intake, high compression, closer gearing? It's already been noted true that the nb sensor freaks out with a large camshaft overlap due to unburned fuel in the exhaust. That means that the blms will be altered, thus making them inaccurate (in closed loop operation). I know this is true with a wb also; it too will read a false lean condition due to unburned fuel, but if you tune and leave it in open loop for good, the ECM won't try to dump extra fuel in to makeup for the lean condition causing a screwy idle....

What is so bad about tuning everything in open loop including idle, part throttle and wot? And LEAVING it in open loop after tuning? I understand that leaving it in closed loop the ECM will compensate for x based on temp changes, altitude changes,etc....... But if you leave the wb in the car for viewing while daily driving, then whats the big deal! If the temperature or altitude alters your afrs enough to need changed, burn another chip.

if there was only a way to allow the ecm to read and understand the 0-5v signal that the wideband uses, instead of the 0-1v signal the narrowband uses.....

but for a sticky thread I think this info would be good:
-AFR rich/lean limits on an NA motor (high compression and low compression)
-Suggested AFRs for NA motors
-AFR rich/lean limits for boosted motors
-Suggested AFRs for boosted motors
-Preferred sensors and controllers
-and whatever else there is out there that people ask about.

i think if this was all incorporated into one thread it would be better than a mess of info spread all over the forums that you must serach through just to get incomplete answers.

This probably only makes sense to me but hopefully someone can relate.....