Originally Posted by GTLocke13 (Post 5002733)

I meant the part about there actually being a difference in how the feedback controller sees an input of 28.8 vs 30. If the output is a 1-5V signal and the scaling is set so that 28.8 in the ECU is 5V then it won't make any difference either way. It was my way of saying that I'm making a WAG.

Originally Posted by dudical26 (Post 5000927)

I really don't get why the Evo uses so many different load variables. I wonder if it makes sense to have the ECU use one load variable for everything. It would certainly make tuning easier.

Originally Posted by mrfred (Post 5003054)

Found out this evening that while 28.8 deg looks for certain to be the upper limit on MIVEC, 0 deg is not the lower limit. I was able to push the MIVEC as far as -1.6 deg by altering the lower limit and adding negative values to the MIVEC table. So, it looks like the total range is around 30-31 deg, with it spanning from around -1.6 deg (logged) to around 28.4 deg (also logged).

Not sure how much value there is to be able to go negative by -1.6 deg. I suppose the place to use it would be at higher rpms.

Originally Posted by TouringBubble (Post 4991789)

maybe -1.2 to 28.8?

Originally Posted by Evo_Kid (Post 5003181)

TB's post FTW.

Originally Posted by mrfred (Post 5003054)

Found out this evening that while 28.8 deg looks for certain to be the upper limit on MIVEC, 0 deg is not the lower limit. I was able to push the MIVEC as far as -1.6 deg by altering the lower limit and adding negative values to the MIVEC table. So, it looks like the total range is around 30-31 deg, with it spanning from around -1.6 deg (logged) to around 28.4 deg (also logged).

Not sure how much value there is to be able to go negative by -1.6 deg. I suppose the place to use it would be at higher rpms.

If you want to see the MIVEC upper lower limits, add the following two entries to your 88590015 xml file:

---
<table name="MIVEC Bounding Minimum" category="Timing" address="293A" type="1D" level="1" scaling="ValveTiming16"/>

<table name="MIVEC Bounding Maximum" category="Timing" address="293C" type="1D" level="1" scaling="ValveTiming16"/>
---

Then add the following entry to your evo9base.xml file (if you're using post 1.29 version of ECUFlash, use "big" instead of "little" endian):

---
<scaling name="ValveTiming16" units="degrees" toexpr="72-x*0.6/32" frexpr="(72-x)*32/0.6" format="%.1f" min="-1.8" max="28.8" inc="0.1" storagetype="uint16" endian="little"/>
---

Originally Posted by Oracle1 (Post 5004440)

What values should they read in Ecuflash?

SK

Originally Posted by Evo_Kid (Post 5003181)

TB's post FTW.

Originally Posted by razorlab (Post 5007335)

So I tried out -1.6 (which actually you can't input into ecuflash, it just snaps to -1.8) on the dyno today. Was interested in seeing what it would do as I usually run 0 up top on the 9's. Didn't really do anything power wise but this Evo was a un-standard case 9, using a exhaust adjustable cam gear.

I'll try it out on some more 9's and report back. :)

Originally Posted by mrfred (Post 4997318)

Now I've pretty much convinced myself that approx 28-29 deg is the max advance. I grabbed a drawing of the MIVEC assembly from the FSM and measured the amount of rotation possible. Assuming the drawing proportions are reasonably correct, then it looks like there is room for up to 50 deg of advance. However, there is a nub on one of the MIVEC arms that limits the MIVEC advance to 28.8 deg. Seems like that nub would have to sawed off get more than 28.8 deg.

https://www.evolutionm.net/forums/at...hmentid=113813

Originally Posted by esevo (Post 4997440)

What would the advantages be from more cam timing? Any down sides? the factory put it there for a reason, but if more power could be made, I would be willing to saw it off!!!

Originally Posted by JohnBradley (Post 5008753)

mrfred- One other question about the "nub" on the MIVEC gear. I am thinking this is behind the plastic cover and IN the spool valve assembly yes? Once my car is back from getting the transmission rebuilt or replaced I am gonna do this just because I have to know whether it helps or not.

...

Originally Posted by JohnBradley (Post 5008753)

Bryan- Without having to disclose the actual cam gear setting has this helped spool at all? Optimum MIVEC changes with the lobecenter so altering the effective engineering requires a little time with a dynosim and then you can see what will help or not. I can run it on my lappy later if you want some ideas (unless you already got it in the bag), just PM if you want it done.