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open loop

Old 01-26-2004, 09:45 AM
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0.5 BAR
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Default open loop

Was just wondering.. what triggers open loop mode? TPS position? MAP reading? At what percentage?
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Old 01-26-2004, 10:32 AM
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Default Re:open loop

TPS at +~80% -> Closed to Open loop.
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Old 01-27-2004, 02:02 AM
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Default Re:open loop

You shure it's only triggered by TPS?
I ask because when on freeways, I usually drive ~100-110mph, and that's now with like 1/3 throttle... so wondering if staying in closed loop will cause me to run more stoich A/F ratio -> coudl that damage engine?
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Old 01-27-2004, 10:52 AM
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Default Re:open loop

Well, it's all about air (pressure) vs fuel, not speed when determining A/F ratio and being "safe".

I can drive about 110 (entirely too fast mind you :P ) and still maintain 10inHg at 12% throttle.. Which is still closed loop. All the while having a bouncing A/F (indicating ECU correction, I.E. closed loop). So you should be safe.

OBD0 is based on TPS. I don't have much experience with OBD1 or 2. They could factor in engine load, I guess. I do know, however, that TPS is a main, if not the, deciding factor.
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Old 01-27-2004, 11:06 AM
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Default Re:open loop

So its 80% throttle that it goes into open loop? Damn I coulda swore I heard 50%.
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Old 01-27-2004, 04:28 PM
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Default Re:open loop

Originally Posted by TurboEF9
Well, it's all about air (pressure) vs fuel, not speed when determining A/F ratio and being "safe".

I can drive about 110 (entirely too fast mind you :P ) and still maintain 10inHg at 12% throttle.. Which is still closed loop. All the while having a bouncing A/F (indicating ECU correction, I.E. closed loop). So you should be safe.

OBD0 is based on TPS. I don't have much experience with OBD1 or 2. They could factor in engine load, I guess. I do know, however, that TPS is a main, if not the, deciding factor.
Well, I havent really driven on freeways since went turbo, but from what I've tested... it seems like I'll be in boost, like 2-3psi at 110mph in 5th gear, with ~1/3 throttle - before it was like 90% throttle for same speed
Mind that... I usually cruise at 100mph.. so 110 aint that fast .. as some might wonder what about cops? Well... mostly they use laser guns to read speed.. and that's where laser jammer does it's magic.. even when pulled over, I never ever paid more than 30US$ (well, our currency converted to US$), as I was always able to bribe 'em.. at least there is something good living here
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Old 01-27-2004, 04:54 PM
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Default Re:open loop

bribery is a ------ felony in the states
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