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What oil are you running? Is your motor built?
He is running 10w60 Motul, and yes his engine if built bottom, built head with GSC S2s and supertech dual springs.
Whenever we add (subtract in ecuflash) any MIVEC degrees on the exhaust side the car will sputter and register knock.
Even though everything else is perfect in terms of fueling and timing.
 

[E-Tuner]
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So if you keep the exhaust MIVEC target closet to 0* it will run fine? But if you try to increase the retard the car will sputter and knock?
If that is the case, I would replace the MIVEC solenoid and the MIVEC actuator before deleting the exhaust MIVEC because deleting MIVEC will have a significant negative impact on engine response and turbo spool up.
 

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So if you keep the exhaust MIVEC target closet to 0* it will run fine? But if you try to increase the retard the car will sputter and knock?
If that is the case, I would replace the MIVEC solenoid and the MIVEC actuator before deleting the exhaust MIVEC because deleting MIVEC will have a significant negative impact on engine response and turbo spool up.
Exactly! The more the retard the more it sputters.
We have already changed both and unfortunately it鈥檚 the same issue.
On Evoscan the MIVEC actual and target are always spot on with a variation or a degree or two.
What could cause this?
 

[E-Tuner]
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Ok, then its possible that too much MIVEC advance/retard will cause it to lean out and sputter, so depending on your intake target, you may have too much valve overlap.

You can either reduce the overlap, or set the car into open loop and add more fuel where you need it.
 

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Frankly the intake advance is at 10掳 and exhaust retard currently at -1.2掳, any further and the car will start acting weird.
The AFRs are always spot on during spool up and full boost.
What we also noticed is that this only happens from 3500-6000rpms then it smooths out.

Is it due to the S2s? The valve spring rates?
We are lost.
 

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Your problem may be the supertech dual springs. Those, coupled with the S2 profile, might be too much for MIVEC.

The GSC beehives were the best springs to run to retain exhaust MIVEC, you may have to switch to those to be able to run it on the current setup

I am not a tuner, so if Chet disagrees with this, go with his advice first
 
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