Int says lean, but BLM says rich. - which is correct?
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Joined: Jun 2004
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From: phx az
Car: 91 corvette
Engine: 383SR
Transmission: 700r4
Int says lean, but BLM says rich. - which is correct?
so whats up here... i'm a little confused. is my time not set to update fast enough on my pcm? do any of you guys change your update blm cells to 400ms?
Re: Int says lean, but BLM says rich. - which is correct?
Good question. Mine is set to stock settings. You are right on the time before update occurs. I could probably look at a datalog later to see how long it takes. Why deviate from stock? If your ECU processes faster you may want to change then. My guess.
Joined: Apr 2004
Posts: 3,180
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From: Browns Town
Car: 86 Monte SS (730,$8D,G3,AP,4K,S_V4)
Engine: 406 Hyd Roller 236/242
Transmission: 700R4 HomeBrew, 2.4K stall
Axle/Gears: 3:73 Posi, 7.5 Soon to break
Re: Int says lean, but BLM says rich. - which is correct?
Your not looking at the data correctly.
The BLM updates a value when the Integrator runs out of adjustment.
As a very rough description...
BLM is a "coarse" value and the INT could be considered the "fine".
You could have a very low BLM (indicating you have too much fuel) while the INT is adding "just a bit" of fuel back in.
It would be better to look at your O2 values and determine if the BLM correction is correct for the situation.
Misfires will indicate lean and add fuel via the BLM even though it was an over-rich condition that caused the misfire in the first place.
Jp
The BLM updates a value when the Integrator runs out of adjustment.
As a very rough description...
BLM is a "coarse" value and the INT could be considered the "fine".
You could have a very low BLM (indicating you have too much fuel) while the INT is adding "just a bit" of fuel back in.
It would be better to look at your O2 values and determine if the BLM correction is correct for the situation.
Misfires will indicate lean and add fuel via the BLM even though it was an over-rich condition that caused the misfire in the first place.
Jp
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