I tune my own car in open loop, but I will not tune someone else's car and leave it in open loop. The iat and ect still effect fueling so you can use the bias to help keep low speed fueling more consistent. I like to setup a leaner than stoich idle as well as a leaner cruise for highway speeds so open loop works well for me on an aggressive cammed/boosted motor. With an accurate iat and tuned iat/ect bias you can keep low speed fueling changes due to weather to a minimum non consequential difference. Excellent explanation and I agree open loop wouldn't be recommended in the vast majority of cases, but for the person with an aggressive setup and the ability to tune themselves then it can be desire able for some setups.
I can see how that'd work really well - never thought of it like that ... I take back my "might as well run a carb at that point" comment! :D So I'm curious though - what benefit do you gain by removing the upstream O2's?
When you mentioned people deleting 02 sensors, my first thought was "at that point, just get a carb intake and a spark box" and then you said it :D :D I personally have deleted MAF and the after cat O2's on my swap - but that's not because it's a swap, or because it's a standalone harness at all. It's because it's just beyond the capability of a MAF, and it's a track only car. So I'm not worried about drivability. I'm worried more or less about WOT only. Speed density is "the way" ... for ME. To be a "standalone" you don't have to delete ANY sensors. Matter of fact, the easiest way to swap is to NOT delete any sensors. All you really have to do is remove vehicle wiring from the harness, and do a 3 wire hookup. With all the sensors it had to begin with. Oh, and turn off VATS and maybe some DTC's for after cat O2's. But you don't have to delete those either! Exactly 0 other tuning required.
Have you guys done a video about narrow band O2 placement with modified exhaust or say a truck single turbo setup? Where is the best O2 placement for them when drivers side bank feeds passenger bank and passenger bank O2 see's both banks. Best tuning strategy?
I don't understand why disable O2 sensors? For anything Street, I'm planning a swap of a 4.8/5.3 in a 96 S-truck, I was thinking 3rd gen, but considering gen4, id like to get a 6L80, I'm looking for about 600hp Street turboed, swap nearly the whole harness, and piggyback what's needed for factors gauges in the truck ,allow the LS/vortex ecm control only the engine and trans, I may end up with a 4L60, if so I guess I'll eventually get a 4L80, but a 6L80 or 8L90 would be nice! Don't know if it's in the budget!
Do O2s influence VE tables then? If your running speed density with no MAF sensor then why would you even have an O2(assuming they don't correct VE table...)
The O2 will correct the fueling regardless of what airflow model the ECU is using to calculate the initial fuel input. “Speed Density” (VE only with no MAF sensor) is not the same thing as “Open Loop” (having no O2 sensors). This is a misconception. Thanks for your question! It's the reason we made this video.
Great explanation! I just have a question if I want to delete my o2 sensors, does the o2 functions on WOT? I have them disconnected and seems have idle issues only
Some one answer me if I want to tune my chevy caprice v8 that only have bolt ons on hp tuners I will only go to engine speed density and tune the ve map(maniflod air pressure) tables after loging it and I should be fine right someone answer me please
