WOT rich - Base Pulse Width Constant?
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Car: Chevy Suburban-ish "Camaro" 1991
Engine: 383
Transmission: 4L80e
WOT rich - Base Pulse Width Constant?
My tune has been running fairly well, but I do have a question about an issue:
When under heavy load (going up a hill etc), when the car enters WOT perameters, my Wide Band O2 consistantly shows 11.3 ish of AFR. My Bin is programed to be 12.8 AFR at WOT. Does this indicate that my Base Pulse Width Constant is set a bit high? Is there anything else to look at to get the WOT AFR to match what the BLM has as an input?
Thanks for the help,
Keith
When under heavy load (going up a hill etc), when the car enters WOT perameters, my Wide Band O2 consistantly shows 11.3 ish of AFR. My Bin is programed to be 12.8 AFR at WOT. Does this indicate that my Base Pulse Width Constant is set a bit high? Is there anything else to look at to get the WOT AFR to match what the BLM has as an input?
Thanks for the help,
Keith
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Re: WOT rich - Base Pulse Width Constant?
My tune has been running fairly well, but I do have a question about an issue:
When under heavy load (going up a hill etc), when the car enters WOT perameters, my Wide Band O2 consistantly shows 11.3 ish of AFR. My Bin is programed to be 12.8 AFR at WOT. Does this indicate that my Base Pulse Width Constant is set a bit high? Is there anything else to look at to get the WOT AFR to match what the BLM has as an input?
Thanks for the help,
Keith
When under heavy load (going up a hill etc), when the car enters WOT perameters, my Wide Band O2 consistantly shows 11.3 ish of AFR. My Bin is programed to be 12.8 AFR at WOT. Does this indicate that my Base Pulse Width Constant is set a bit high? Is there anything else to look at to get the WOT AFR to match what the BLM has as an input?
Thanks for the help,
Keith
RBob.
#3
Re: WOT rich - Base Pulse Width Constant?
Is it not difficult to get a real BLM at that RPM/MAP unless PE is disabled? (not recommended).
would not you just drop appropriate VE fuel a little at a time until you see a desired A/F?
I had similar rich PE on WB that required I drop VE table values and then smoothen areas under accordingly.
If you learn from WB I believe you can get PE learns. Maybe I will try that this coming season.
would not you just drop appropriate VE fuel a little at a time until you see a desired A/F?
I had similar rich PE on WB that required I drop VE table values and then smoothen areas under accordingly.
If you learn from WB I believe you can get PE learns. Maybe I will try that this coming season.
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Re: WOT rich - Base Pulse Width Constant?
Thanks, I don't learn for WB, I just look at the guage while driving. I will try adjusting the VE table. I was under the impression that the VE table was overridden when in PE mode, but I guess I was wrong. I do recall that BLM's were at 128 at WOT.
What effect does the WOT AFR table have if the VE table is used at that time?
What effect does the WOT AFR table have if the VE table is used at that time?
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Re: WOT rich - Base Pulse Width Constant?
Thanks, I don't learn for WB, I just look at the guage while driving. I will try adjusting the VE table. I was under the impression that the VE table was overridden when in PE mode, but I guess I was wrong. I do recall that BLM's were at 128 at WOT.
What effect does the WOT AFR table have if the VE table is used at that time?
What effect does the WOT AFR table have if the VE table is used at that time?
PW = BPC * ~AFR * ~T * VE * MAP
The ~ means inverse, a smaller value will make the PW larger. That is the basic PW equation.
RBob.
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Re: WOT rich - Base Pulse Width Constant?
So a 118 BPW Constant is more fuel than a 134 BPW constant?
I guess what I should ask is what does the number stand for?
I guess what I should ask is what does the number stand for?
Last edited by EagleMark; 03-25-2011 at 10:54 AM.
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Re: WOT rich - Base Pulse Width Constant?
A larger BPC will create a larger PW. Only the AFR and temperature (T) terms are inverse in the PW calculation.
RBob.
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