Idle threshold question
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From: Oswego, IL 60543
Idle threshold question
JP86SS posted that the table location/address is: $1E6 (threshold value)
Sorry for the dumb question, but what is the title of the table $1E6 in the SUPER_8D XDF file? Or does one not exist? I am using a 7727 ECM and $8D. I would really like to get the idle threshold raised for now.
Can someone please help??
Sorry for the dumb question, but what is the title of the table $1E6 in the SUPER_8D XDF file? Or does one not exist? I am using a 7727 ECM and $8D. I would really like to get the idle threshold raised for now.
Can someone please help??
Joined: Apr 2004
Posts: 3,180
Likes: 3
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
"Spark Advance LO GAIN Desired RPM Threshold"
What I saw was a threshold value there that was set for stock of 800 rpm.
When I changed the idle error tables to reduce the amount of spark jumping up/down I also moved the value to be away from my 800-850 idle rpm.
Not 100% on how the value is used in the spark code but just didn't think it was good to leave a value there that I was continuously crossing.
Figured it wasn't helping keep things stable so I adjusted it.
In conjunction with the error table mods, the idle SA is only moving about 4* rather than 8-10* as previously seen.
If anyone else can chime in on the function, I'd be interested to learn as well.
Jp
What I saw was a threshold value there that was set for stock of 800 rpm.
When I changed the idle error tables to reduce the amount of spark jumping up/down I also moved the value to be away from my 800-850 idle rpm.
Not 100% on how the value is used in the spark code but just didn't think it was good to leave a value there that I was continuously crossing.
Figured it wasn't helping keep things stable so I adjusted it.
In conjunction with the error table mods, the idle SA is only moving about 4* rather than 8-10* as previously seen.
If anyone else can chime in on the function, I'd be interested to learn as well.
Jp
Last edited by JP86SS; Nov 22, 2006 at 11:26 AM.
Joined: Apr 2004
Posts: 3,180
Likes: 3
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
It is not a table, just a single entry.
I believe this is the RPM value where the multipliers change.
The multipliers at $1E8 & $1E9 may be used below that threshold (or not)
have to either investigate or hear from someone who has traced it better.
I believe this is the RPM value where the multipliers change.
Code:
;----------------------------------------
; IDLE SA PARAMETERS
;----------------------------------------
L81E5: .byte 0x0F ; 15 SEC, IDLE SA INHIB DISABLE RICH TMR THRESH DRef: 0xCBA1
L81E6: .byte 0x40 ; 800 RPM, LO GAIN DESIRED RPM THRESH DRef: 0xBA79
; ((VAL/256)/2) * 6400 RPM Formula Used (uses 12.5 RPM)
L81E7: .byte 0x60 ; 1.2 SEC, LO GAIN XISITION DELAY DRef: 0xBA7E
L81E8: .byte 0xC0 ; 0.75, LO GAIN UNDER SPD MULT DRef: 0xBAE0
L81E9: .byte 0x80 ; 0.5, LO GAIN OVER SPD MULT DRef: 0xBAE7
L81EA: .byte 0x08 ; 100 RPM REQUIRED RPM OFFSET DRef: 0xBA9F
;------------------------------------------------------- have to either investigate or hear from someone who has traced it better.
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