Frank Katzenberger
Squirrel Performance - Home of the best turbo calc!!!
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91 Daytona Shelby - It is getting there
87 Shelby CSX #418 - Near stock is a good thing!
94 Bronco 302 XLT - Shorty Headers, 3" exhaust, cold air intake, & Soft top
"... to get the best out of it, you have to go beyond the line. Where bravery becomes insanity. Shall I turn into this hairpin bend at a 100mph? Why not!"
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It should be a simple matter to condition the WB encoded value through a bell-curve table to get the desired behavior. Then you can just slide the bell one way or the other to move the stoich point.
Still if you only wanted to nudge it a tad, it seems like the NB should suffice even if it is being used slightly out of spec.
It's possible to create a transfer function in the code to 'convert' the WB signal to emualte a NB signal just like the LC-1 does. I wrote the code for it a while back, but I've never tried it. Not sure I even still have the code snippet. I'll have to look. I didn't have a correction for stoic, but it would be possible to add one.
Frank Katzenberger
Squirrel Performance - Home of the best turbo calc!!!
http://www.squirrelpf.com
91 Daytona Shelby - It is getting there
87 Shelby CSX #418 - Near stock is a good thing!
94 Bronco 302 XLT - Shorty Headers, 3" exhaust, cold air intake, & Soft top
"... to get the best out of it, you have to go beyond the line. Where bravery becomes insanity. Shall I turn into this hairpin bend at a 100mph? Why not!"
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Check out the one and only Shelby Dodge Registry!
Frank Katzenberger
Squirrel Performance - Home of the best turbo calc!!!
http://www.squirrelpf.com
91 Daytona Shelby - It is getting there
87 Shelby CSX #418 - Near stock is a good thing!
94 Bronco 302 XLT - Shorty Headers, 3" exhaust, cold air intake, & Soft top
"... to get the best out of it, you have to go beyond the line. Where bravery becomes insanity. Shall I turn into this hairpin bend at a 100mph? Why not!"
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OK, yeah. I don't think there is an actual table for that. At least not in the LM code. There should be a constant or two marking the position of the "neutral zone" boundaries, but the behavior beyond that is implicit in the autocal values. What I mean is that because the voltage-per-AF-ratio changes so quickly in a NB sensor around the neutral zone compared to the WB, the mixture may end up bouncing much further than it should around stoich. At least that is how I understand it.
But yeah, as Brian mentioned the TE NB output is tweakable and I intend to take advantage of that fact (at some point).
me = techedge n00b.
I'm still sort of interested in how the very linear output of the wideband would act with normal 02 routines. .34 v is around 1 afr on the standard innovate scale. So .5v is around 1.5 afr, and that's the normal sweep of my o2. I'm wondering if the additional accuracy would help things any, but looking at it from a raw math (albeit, back of the envelope) standpoint, it doesn't seem any better.
I was also wondering how hard it would be to gut the o2 routines and make them seek a target afr instead of the toggling and kicks setup. This way you could set a value and just have it seek that value using something like the WG routines.
Frank Katzenberger
Squirrel Performance - Home of the best turbo calc!!!
http://www.squirrelpf.com
91 Daytona Shelby - It is getting there
87 Shelby CSX #418 - Near stock is a good thing!
94 Bronco 302 XLT - Shorty Headers, 3" exhaust, cold air intake, & Soft top
"... to get the best out of it, you have to go beyond the line. Where bravery becomes insanity. Shall I turn into this hairpin bend at a 100mph? Why not!"
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<sarcasam> What's a cat? </sarcasam>
CT emissions are every 2 years for cars newer than 25 years. I'm sure you can see where I'm going with this. 2 more trips and the CSX is done. 1 more trip and the glh-t is done.
I believe that cats "hold" o2 from when the engine was lean, and release it when rich so the toggling gives them o2 to hold. That was the 3rd grade explanation I found last time I wondered how one works.
I understand that you can never get rid of all oscillation, but with a 5v a/d converter and a linear w/b output, I bet you could get it within +/- .2 or .3 afr.
My understanding (not that it's 100% correct) is that the 'kicks' are timer counts allowed before the A/F is corrected the opposite direction. So, if the a/f is going leaner, it's allowed to go lean until the timer matches the 'lean' kicks value, then it richens the mixture up until it reaches the 'rich' kicks value. This is what causes the toggling effect. So, if you increase the 'lean' kicks value (or decrease the rich kicks value), you move the middle of the range to the lean side. Of course, you need to do it for the correct cells (or maybe all the cells).
Frank Katzenberger
Squirrel Performance - Home of the best turbo calc!!!
http://www.squirrelpf.com
91 Daytona Shelby - It is getting there
87 Shelby CSX #418 - Near stock is a good thing!
94 Bronco 302 XLT - Shorty Headers, 3" exhaust, cold air intake, & Soft top
"... to get the best out of it, you have to go beyond the line. Where bravery becomes insanity. Shall I turn into this hairpin bend at a 100mph? Why not!"
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its just voltage frank, im pretty sure.
Brian
Originally Posted by turbovanman
I don't think it uses a/f directly. I think it just looks to see whether or not the o2 voltage is above or below .5v (which would be 14.7) . I haven't read any of the o2 code, but based upon what Rob says above:
if o2 volts > .5v wait until timer is counted down, then richen mixture
if o2 volts < .5v wait until time is counted down, then lean mixture out
gotcha.
So what would it take for us to remap the current parameters to look at the new voltages instead of using a transfer function, which unfortunely I think doesn't do much more then our NB outputs from our WB kits. I would love to see us target the new voltage and be able to tighten up the bouncing, etc.
Frank Katzenberger
Squirrel Performance - Home of the best turbo calc!!!
http://www.squirrelpf.com
91 Daytona Shelby - It is getting there
87 Shelby CSX #418 - Near stock is a good thing!
94 Bronco 302 XLT - Shorty Headers, 3" exhaust, cold air intake, & Soft top
"... to get the best out of it, you have to go beyond the line. Where bravery becomes insanity. Shall I turn into this hairpin bend at a 100mph? Why not!"
Visit the new Knowledge Center today!
Check out the one and only Shelby Dodge Registry!