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- Joined
- Feb 28, 2001
- Messages
- 8,026
- Reaction score
- 4,359
- Points
- 113
- Location
- Dayton Oregon
- Vehicle Year
- 1990, 1997
- Make / Model
- Ford
- Engine Type
- 2.3 (4 Cylinder)
- Engine Size
- 2.3 Turbo
- Transmission
- Manual
- 2WD / 4WD
- 4WD
- Total Lift
- 6
- Tire Size
- 35"
The only time any engine needs to go into open loop is when the exhaust temperatures start to get past the safe point where you need to start adding fuel to cool the exhaust. That has nothing to do with it being forced induction or not, forced induction engines can just flow more air and fuel to heat up the exhaust easier than a N/A engine. I agree things get different depending on the control scheme... About a year ago I was tuning on a supercharged 6.2L engine at work to meet emissions and everything. It is for jet boat applications so I limited the engine to 5000rpm, I was able to keep it in closed loop control through about 3800rpm if memory serves and about 60% load. The engine ended up making 509hp at 5000rpm and I limited it down to that which was at about 7psi boost, if I went for more power I started having catalyst temperature issues along with emissions issues, and I think back pressure and valve temp issues... I don't think many people will use them at that point though as the fuel usage is kinda ridiculous 
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I appreciate your knowledge. But, Yup this is old stuff, no closed loop fuel table in my 2001 tune. It is a constant 14.64:1 In my older 96 Bronco there was a closed loop fuel table you could adjust, in stock form it had 14.64 in all the cells in the table. Hear ya on closed loop for mileage and emissions with the HEGO's doing the work.
