Sinister Performance 
Well I don't know what you are doing wrong but I've tuned dozens of cars (3800's and V8's) with aftermarket cams, some bigger than the XP/S1X/NIC. I've never had an instance where the closed loop system refused to work properly. I've always been able to tune the car using EITHER the fuel trims (working off the narrow band O2(s)) or a wideband; and then been able to send it out the door with the narrow band O2(s) still in there, fuel trims working, and closed loop enabled without any issues. Your notion of disabling closed loop operation and then sending it back to the customer is a bad idea, in my opinion. And I'll give you one example why...Originally Posted by darkhorizon
Dave over at TripleEdge had a car come into his shop that had an open loop tune done. But after the customer drove the car around up here for a while (I think he moved up here from somewhere down south), it was running overly rich and the PCM had no way to lean the fuel back out because closed loop was disabled. The guy is damn lucky his cylinders didn't get washed down which would have trashed the block by the engine running so rich before the issue got corrected by Dave. This is one of the problems with open loop tunes. Move from one area (with a certain climate) to another and the way the engine runs is going to change. That is a fact.
Open loop tunes are great if you are going to be monitoring your car 100% of the time, and can make changes yourself if you see something going wrong. But that isn't practical. I don't know about you, but I rather enjoy driving my car and I do use it for pure transportation sometimes rather than just 100% leisure. So the thought of having a laptop on-board 100% of the time I drive it and having to keep one eye glued on that laptop doesn't appeal to me. Not only that, but I'm not the only person who drives my car. Sometimes my wife likes to drive it as well. And I'm sure just about everybody on here is going to feel the same way. I wouldn't run an open loop tune on ANYTHING unless it was a last resort (because you have an issue that prevents the engine from running correctly in closed loop). But like I said, I have yet to stumble across an application that can't be run in closed loop. And I've tuned some pretty healthy setups (I've tuned over 1000 PCMs and chips for over 10 years so I've seen quite a lot).
I'm not saying an open loop tune can't work, I'm just saying it isn't practical for 99.999% of the people out there. You can, of course, do whatever you want with your car.
Oh and thanks for the long post explaining pretty much nothing about what was asked earlier. If you don't know, then just say you don't know or don't post anything at all. No need to post fodder saying "it will take too long to explain" or bashing people because they don't know where to find all the information you've found in your internet searches.
