Why when tuning with a wideband it is done in open loop, as opposed to closed loop when tuning without a wideband? Im really confused about this because it doesent make sense to me to tune in open loop with a wideband if you plan on running SD and that is closed loop.
when your tuning without a wideband your using your fuel trims to tune your ve. Fuel trims are only used when your in closed loop so thats why you tune in closed loop
If you have a wideband set the car to be in open loop and you tune via AFR error. You command a AFR and you adjust the ve table based on the error between commanded vs what your acctualy getting. This method wouldnt work if you were in cloosed loop because the computer is always adjusting the afr to be 14.7 which is what you command during part throttle so it will show your ve table to be spot on
The only reason you cant tune with a narrowband in open loop is that they not not accurate and reading AFR other that 14.7 so your afr error wouldnt be accurate
Ronny
04 VY Commodore ute M6 ls1, 918 valve springs, TR6 plugs, genttrbb twin turbo kit, 60lb seimiens injectors, Bosh 044 fuel pump, SX fuel reg, PLX wideband,Full Castle Hill Exhaust with 2 1/2in dump pipes, 4in cats into twin 3in cat back (no merge), Ripshift, oz700 clutch and 3.73 diff gears
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