The mivec is cam timing, as you know. Maybe I am reading your statement wrong but how would mivec cam timing change ignition timing? Unless the mivec is very aggressive there and causes the car to knock...

 

Less air sucked accross MAF in respect to the amt of energy driving the turbine (catalysed combustion, colder charge etc) so boost will go up too, but how would that cause three timing shifts back and forth in one second?

Almost like the system was stoped spraying intermittently, but the ecu can't respond that fast can it?

 

I'm not sure..

The MIVEC is cam timing, but maybe the ignition timing is programmatically altered when cam timing shifts.. We all know that shifting the engines cam overlap and cam timingtiming alters the tune.. It was the only logical thing I could think of that could occur "By design"

 

As far as the MIVEC maps go the only thing that is changed is the dip in the 2000-3500 range on his car is take out and made 19.2

 

Nawz was not sprayed on that run btw.

 

I agree it does have the symptons of overrun, but would that not be more likely to happen at peak boost IE 3500-5000 range and not as high as its occuring?

 

Still cant rule out wiring, circuitry, or component defect.

Time to slave a MAF from another IX to see if that cures it . If not, then try another person's Evoscanware or cable or PC. Just remember to provide a conclusion when you find it

 

went out and did more tuning, the car still seems to "overrun" the load cells, there was areas that the timing went that was not on the map at all, im guessing when you go past all the load cells it looks up weres the timing was last at and adjusts it from there, any input ?

 

From what I noticed, when you exceed the set load values, timing automatically pulls