MIVEC disassembly notes
Nov 26, 2007, 08:38 AM
#1
MIVEC disassembly notes
Just getting started on decoding the MIVEC algorithm. First tidbit is the MIVEC range. My recollection is that people are saying its 0 to 30 deg. The software code limits it to 0 to 28.8 deg, so anything higher than that in your MIVEC maps gets pulled down to 28.8 deg.
More later...
More later...
Nov 26, 2007, 12:12 PM
#7
The limits are definitely 0 to 28.8 in the ECUFlash scaling of the hex values. I still haven't verified the scaling used by ECUFlash though. Most of the scalings that I've checked have been correct, but there have been a few errors here and there.
Hey JB, does the FSM say "0" to "30"?
Hey JB, does the FSM say "0" to "30"?
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Nov 26, 2007, 03:54 PM
#9
The factory service manual says that the intake valve opens (variable) 0-30* BTDC and closes 80-50* ABDC. I might have the actual piston event labelled incorrectly but I listed it in the original MIVEC tuning thread somewhere.
As far as the wags making reference to Spinal Tap, while I cant explain why it would matter if the hex is limited to 28.8* (I assume a value of 255) there are dyno'd torque improvements running 30*. A certain tooner that has left for the green pastures of BMW and Porsche used to set his maps to 33* and it would throw a MIVEC out of range code (like P1175 I think).
As far as the wags making reference to Spinal Tap, while I cant explain why it would matter if the hex is limited to 28.8* (I assume a value of 255) there are dyno'd torque improvements running 30*. A certain tooner that has left for the green pastures of BMW and Porsche used to set his maps to 33* and it would throw a MIVEC out of range code (like P1175 I think).
Last edited by JohnBradley; Nov 26, 2007 at 03:56 PM.
Nov 26, 2007, 04:12 PM
#12
As far as the wags making reference to Spinal Tap, while I cant explain why it would matter if the hex is limited to 28.8* (I assume a value of 255) there are dyno'd torque improvements running 30*. A certain tooner that has left for the green pastures of BMW and Porsche used to set his maps to 33* and it would throw a MIVEC out of range code (like P1175 I think).
