I was thinking that with more extreme combos, it is easier to just tell the computer what to do rather than have it thinking on its own in closed loop. I have heard that driveability can be improved, part throttle acceleration is on point, etc. etc. Is there any downside???

I am spending this weekend working on my trans am, well actually tuning it mostly. I have purchased a Zeitronix ZT2 wideband o2 with the LCD display, it's a nice setup - unlike all of the other widebands out there it comes with the ability to log lambda or afr next to rpm, tps, boost/vacuum (with a 3 bar map), and a couple others PLUS it has a custom user input for a 0-5 volt sensor for a lot less. I'm going to try hooking up the knock signal wire to see if it works or not. IMO, a wideband is useless if you can't log it with at least RPM and throttle position simultaneously. Anybody know if this setup will run off the 2 bar map I use for my alcohol injection so I can see what load range I am in for a specific afr I want to alter.

I also bought a pcmcia serial port because that crappy belkin f5u103 locks up almost every laptop I use it on and when it does work it stops logging randomly. I am now fully equipped!!!!!

So, back to the original question, know that I have all those tools, and tunercat, would it be smart to run the car in open loop? The only downside I see is that if for some reason I get a lean condition the computer can't compensate but of course I'd have the AFR display indicating that it was going lean.

 

I'd prefer to be looking down the road at WOT rather than staring at my AFR readout. I'm not knocking your idea but I like the safety of the computer watching the AFR.

 

But realistically, if your afr changes quickly you will feel it and let off the gas. I wouldn't need to see the meter to know something was wrong. What about the advantages of open loop?

 

Other than terrible gas mileage I'm not sure of the advantage of open loop..You might make some more power, but I don't think it would be worth it, esp at $3.25+ a gallon...