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...

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Interesting. Its the factory service manual that said 0-30 degrees.

maybe -1.2 to 28.8?

I thought it only went to 28.8

LOL at all these people saying they use "30s" and can feel a difference.

Maybe they have guitar amps that can go to 11? :D

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"?

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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).

I remember that. Maybe its this...

I knew I posted it in there somewhere:

https://www.evolutionm.net/forums/sh...5&postcount=99

Re: Spinal Tap. Was just trying to be funny...not intended to be a swipe at anyone's expense. And I thought I read somewhere said tuner would input values even higher than 33*.

That certain tooner also had maps that had 20+ knock count.

That would line up with my experience with said tuner, although I only had 12-16 IIRC. :cool:

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