Open Loop vs Closed Loop
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Joined: Jul 2000
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From: Santa Maria, CA
Open Loop vs Closed Loop
I know nothing about programming PROMs but have been reading most every post here.
What I would like to know is if you can use the open loop parameters to tailor the closed loop parameters?
The reason I ask, is that my car runs best when it is first started and still running in open loop. I wished it had this same crisp throttle response and power when it is in closed loop.
When you program a chip, do you only change the closed loop parameters? Or is the open loop something you also look at?
Keep the information coming guys, this is good stuff.
P.S. I'm still running the stock PROM but hope to remedy that before too long.
------------------
87 GTA, 350 TPI, auto, 3:27 gears, rebuilt engine, ZZ3 cam, LT4 valve springs, pocket ported stock heads, edelbrock intake, TPIS air foil, AFPR, high flow air cleaner, modified stock air canister, relocated air intake sensor, tb bypass ported plenum, modified MAF (screens removed), edelbrock headers, hi-flo cat, flowmaster muffler.
What I would like to know is if you can use the open loop parameters to tailor the closed loop parameters?
The reason I ask, is that my car runs best when it is first started and still running in open loop. I wished it had this same crisp throttle response and power when it is in closed loop.
When you program a chip, do you only change the closed loop parameters? Or is the open loop something you also look at?
Keep the information coming guys, this is good stuff.
P.S. I'm still running the stock PROM but hope to remedy that before too long.
------------------
87 GTA, 350 TPI, auto, 3:27 gears, rebuilt engine, ZZ3 cam, LT4 valve springs, pocket ported stock heads, edelbrock intake, TPIS air foil, AFPR, high flow air cleaner, modified stock air canister, relocated air intake sensor, tb bypass ported plenum, modified MAF (screens removed), edelbrock headers, hi-flo cat, flowmaster muffler.
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Joined: Jun 2000
Posts: 7,554
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From: In reality
Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
Originally posted by DSouthern:
I know nothing about programming PROMs but have been reading most every post here.
What I would like to know is if you can use the open loop parameters to tailor the closed loop parameters?
The reason I ask, is that my car runs best when it is first started and still running in open loop. I wished it had this same crisp throttle response and power when it is in closed loop.
When you program a chip, do you only change the closed loop parameters? Or is the open loop something you also look at?
Keep the information coming guys, this is good stuff.
P.S. I'm still running the stock PROM but hope to remedy that before too long.
I know nothing about programming PROMs but have been reading most every post here.
What I would like to know is if you can use the open loop parameters to tailor the closed loop parameters?
The reason I ask, is that my car runs best when it is first started and still running in open loop. I wished it had this same crisp throttle response and power when it is in closed loop.
When you program a chip, do you only change the closed loop parameters? Or is the open loop something you also look at?
Keep the information coming guys, this is good stuff.
P.S. I'm still running the stock PROM but hope to remedy that before too long.
The O2 will always force a 14.7 (give or take) AFR when in closed loop.
Too rich, and too much timing always feels Good, but wastes gas, and shortens engine life.
By the same token a perfect chip gives perfect response, without wasting fuel, and shortening engine like.
Same thing to drive, just one is thousands of dollars cheaper
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