I have EBL flash and have been tuning locked in open loop using WB VE learns and I am very pleased with my results. It idles smooth at 50 KPA @750 rpm's and revs to the limiter @6200 quickly with no hesitations anywhere. I never could get the under 1200 rpm to work good closed loop, driving in traffic would beat me to death unless I stayed in lower gears. It runs good and the gas mileage is the best it has ever been. I've driven in 30 degree weather and over 100 degree weather and it always runs great. I don't have cats so is there any reason to not just leave it in open loop and call it good?

 

Are you able to check your actual AFR's with a WB O2? I've been running open loop below 1800 rpm for a while now (although it's a 7730 ECM, not an EBL), but I dialed in my AFR's with a WB O2. WIth the Miniram, it just seems to run a lot better in open loop at the lower RPMs, particularly with regards to changes in throttle position. Above 1800, there's no real difference, so I run closed loop.

I guess overall, I'd say just run it the way you think runs best. As long as you're not getting dangerously lean anywhere, there's no real problem in running open all the time if it you think it runs better that way.

 

The Texas Hill Country is a great place for data logs. I-10 has several straight long steep grades and the speed limit is 80 with not much traffic. I can do WOT WB data logs in third or fourth gear there. At 6200 rpm's I was at 82% duty cycle and 13.3 AFR. I added just a bit more fuel there but after several more data logs and VE learns everything is where I want it to be. I never thought I would say that. I'm staying open loop. I lost count of how many Bin files I have done over the past few years. Maybe a thousand? Now I might have to go to rehab to break my tuning addiction.

 

Hah..you sound just like me. Always looking for an excuse to mess with something in the calibration.

Yeah I have a local freeway nearby me that's always wide open and makes for a perfect place to get good data. Its on a decent grade going one way so I can get a good part throttle or full throttle load on the engine (and then have some "fun" coming back down).

 

I usually run open loop on performance builds. I just like it better, no worries about sensors going bad. Wideband closed loop is better on later model ecm stuff like holley hp. Works great