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OK, now will this mod work, and continue to work on the OBD I?
Yankeyspeed: American power and ingenuity
95 SE -Stock enough
Yeah my car has a baby seat, its still fast.
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Originally posted by Yankeyspeed:
OK, now will this mod work, and continue to work on the OBD I? Yes. OBD-I does not trim out long term fuel changes. It's a very basic monitoring system. wa2fast - I'm not saying the PCM will tune out the voltage change you are doing to the TPS. (that's not feasible) I am saying it will tune out the added fuel trim the increased voltage generates (the reason you "feel" a difference) OBD-II monitors and controls all short & long term fuel trim at anything but WOT and therefore over time will tune out the extra fuel added by this mod... 
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Well obviously you have never done this before as I have because even though that is a good arguement and makes sense, that's not the way it works... trust me. Like I said, I have done this on many OBD-II cars and they have all reacted the same way and over a long period of time, nothing changes. I am not lying about this, I am telling you my personal experience... never tried it on the Contour... that's why I asked the question.
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If OBD-II does tune it out long term, can't you just reset the computer once a month to get the benefit back. I find on my car with my mods resetting once a month keeps things the way I like it. I have been reseeing for a year and a half and have had no problems. I am also chipped so I don't get the long term OBDII effects non chipped cars have.
98 EO #587
Currently Dirt Jumping
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Originally posted by 2112:
If OBD-II does tune it out long term, can't you just reset the computer once a month to get the benefit back. I find on my car with my mods resetting once a month keeps things the way I like it. I have been reseeing for a year and a half and have had no problems. I am also chipped so I don't get the long term OBDII effects non chipped cars have. If the chip negated the long term OBD-II effects, you probably wouldn't have to keep resetting the PCM. And, the chip wouldn't have a CARB E0 number (which Superchips does). Also, sometime in the future (soon in CA IIRC), an EPA mandated emissions test may begin by scanning the PCM and determining if all of the long term monitor tests have run if you have an OBD-II car. So if you have to go through that every year (like I do), it's something to think about. Just food for thought ...
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PA -
Yup, I realized what I said after I hit submit. I do actually notice a difference resetting the puter. I also rest it after every mod, big or small. Even if I just make an adjustment. Probably overkill but after I make my change, and reset, I turn it on with all accessories off and let it do it's thing. The idle will search for about 5 seconds and then settle. I'll let it run by itself for about a minute then slowly feather the throttle more and more. I'm a little overcautious.
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Actually... this theoretically COULD affect WOT performance. If you do in fact run too rich at part-throttle becuase of this mod, the ECU will compensate by leaning out the short and long term fuel trims. You may very well end up with a mild lean condition at WOT! Depending on what state of tune your car is in, this could improve (or hurt) performance at WOT, but it would be a crap shoot.
My guess is that the bigger part-throttle gains come from skewing the load calcuations. I would think that more perceived throttle but less air = less load, so maybe you'll end up with more spark advance at part throttle. This is the ONE THING that the ECU can not "learn out," but again, this is part-throttle only. It's easier to just press on the gas harder.
It would be much better to get a chip that reduces tip-in spark retard and replaces stock the A/F and spark maps, but you get what you pay for, I suppose.
2000 Mercury Cougar V6 ATX. 16.0@87MPH, 155.0 FWHP
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Well, like I said... give it a shot and if you don't like it, then reverse it. This process is 100% reversable if you write down where your voltage is BEFORE you touch anything. If you are not satisfied with the throttle response or are worried that something is not right (which I have never had happen before... it has worked on all cars that I have done this to), then just put it back.
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I have heard enough, How do you do it?
Yankeyspeed: American power and ingenuity
95 SE -Stock enough
Yeah my car has a baby seat, its still fast.
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After having fully read this thread, I have to say you guys sure did jump on wa2fast's case pretty hard! All he did was post a question which could help us all out, and he got nothing but criticism - no it wasn't all constructive either. I think a better way to approach it would be "hey I don't get why this would improve things, here are my thoughts" instead of "this WON'T improve things, here is why" I mean WTF??? wa2fast, I'm on your side man, hope these responses doesn't scare you away... always good to have knowledge from other perspectives ('stang and whatnot) later all and be nice :rolleyes:
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