Lets talk tuning (KiDo Tunes)

[alexeiwoody]

Could you explain a bit more how you set up the diodes, if it's not a secret?

If we're talking voltage pulses, then you'd be using zener diodes, as they allow the current to flow both ways, but regulating out the fluctuations? In layman's terms - sine wave not good?

[bass_straitener]

If this is true then why don't all MY07 MT Libs demonstrate this behavior. I've checked many stock cars that don't and also tuned cars where either the cruise AVCS table hasn't been changed or the changes have been minimal in both cruise and non cruise. Ain's car is one that shows no symptoms.

What are your thoughts on the theory a tuned car has many more small increments requested of the AVCS system to improve driveability whilst the stock tables are setup in bands with less changes requested.

Over the life of the car the cam gears and solenoids would see more work done in a tuned car leading to earlier failure. Failure also being contributed to by the use of thinner Subaru specified oil.

In most cars the oscillation stops by 2800 RPM. How is that explained with regards to the diode theory.

In the mechanical failure theory this has been explained by suggesting at higher RPM there is sufficient oil pressure to achieve the AVCS target though left un checked would see the OCV failing too due to overwork.

I'll be getting my gears and OCVs changed shortly so will see if the sine wave remains. I'm sure Ben will be over the day I get the car back to get a log.

[KiDo_Tuning]

Could you explain a bit more how you set up the diodes, if it's not a secret?

If we're talking voltage pulses, then you'd be using zener diodes, as they allow the current to flow both ways, but regulating out the fluctuations? In layman's terms - sine wave not good?

If that was your accelerator pedal signal generating the sine waye, how would it drive?

The vehicles owner is doing the testing

If this is true then why don't all MY07 MT Libs demonstrate this behavior. I've checked many stock cars that don't and also tuned cars where either the cruise AVCS table hasn't been changed or the changes have been minimal in both cruise and non cruise. Ain's car is one that shows no symptoms.

What are your thoughts on the theory a tuned car has many more small increments requested of the AVCS system to improve driveability whilst the stock tables are setup in bands with less changes requested.

Over the life of the car the cam gears and solenoids would see more work done in a tuned car leading to earlier failure. Failure also being contributed to by the use of thinner Subaru specified oil.

In most cars the oscillation stops by 2800 RPM. How is that explained with regards to the diode theory.

In the mechanical failure theory this has been explained by suggesting at higher RPM there is sufficient oil pressure to achieve the AVCS target though left un checked would see the OCV failing too due to overwork.

I'll be getting my gears and OCVs changed shortly so will see if the sine wave remains. I'm sure Ben will be over the day I get the car back to get a log.

Because of the engine bay item which generates the sine wave and it is reduced above 2800rpm, not eliminated but that is the OCV duty cycle tables compensating, where it alters from -7 at 2400rpm to -10.5 duty cycle at 2800rpm! The positive ranges go from 3.55 to 4.7%
Hmm, actually thanks for the idea This may be a simpler fix than I thought! Just like getting WGDC on target, the OCV values may be the key

Odd that is is only the MY07/08 though? The diode test car has a PLX Oil Pressure gauge being logged via the tactrix, with the oil pressure sensor in the AVCS banjo bolt(double banjo bolt fitted) so it will indicate how much OCV variance occurs and see what pressure pulses are generated with the diodes in and out. The AVCS cam gear sensor is being left diode free to confirm that the gear is operating normally and that engine bay noise(the equivalent of RFI in a server room) is no longer in the engine bay loom.

[<GB>]

Post some logs up

[2008Liberty]

Gday fellas,

i spoke to matt 6 months ago roughly about the PO420 code i was having with my 2008 2.5i sedan..
its just come back on after 2 months and now am now getting quite fed up with it.
subaru have told me that im up for 4k to replace my catalytic converter, however doing alot of research into this i have realised there are other possible issues which could not be as major such as a sensor etc..

i do remember talking to matt about a possible tune that will block the rear 02 sensor behind my cat and that will then allow my CEL to turn off..

can you message me as to whats involved? so we can discuss further.

regards,
scott

[KiDo_Tuning]

Probably going to regret posting this because my email is overloaded enough as it is but... HItachi ECU is no longer an unflashable ECU, even for the GC8 WRX and preface NA

Not a cheap option but it can now be done.

[DownUnder]

YES! This makes me very very very happy! If you're busy can anyone else tune them. XRT maybe? Is it the standard tatrix route or does it need specialist equipment?

[agan]

Probably going to regret posting this because my email is overloaded enough as it is but... HItachi ECU is no longer an unflashable ECU, even for the GC8 WRX and preface NA

Not a cheap option but it can now be done.

You may hear from D_Chang soon

[d-chang]

So..... Matt, when are you next in Perth?

[Anson]

So..... Matt, when are you next in Perth?

Interested as well...

[KiDo_Tuning]

Melbourne, Canberra, Brisbane, Gold Coast, Adelaide, Perth, Auckland and Mackay(plus a few more Sydney trips) are all set for this year.

YES! This makes me very very very happy! If you're busy can anyone else tune them. XRT maybe? Is it the standard tatrix route or does it need specialist equipment?

Custom route with speccialist equipment and it is based on the Hitachi ECU is developed from a Unisia JECS ECU No Tactrix needed, just a USB cable but it is still not a cheap option... pricing to be finalised shortly.

[agan]

That makes d_chang a very happy man

[oldmate]

Melbourne, Canberra, Brisbane, Gold Coast, Adelaide, Perth, Auckland and Mackay(plus a few more Sydney trips) are all set for this year.

YES! This makes me very very very happy! If you're busy can anyone else tune them. XRT maybe? Is it the standard tatrix route or does it need specialist equipment?

Custom route with speccialist equipment and it is based on the Hitachi ECU is developed from a Unisia JECS ECU No Tactrix needed, just a USB cable but it is still not a cheap option... pricing to be finalised shortly.

Myself and a mate with a forester gt are both extremely keen when you head up to Brisbane/Gold Coast next

[shav]

Keen to know when your adelaide dates are matt. Wouldn't mind a bit of a tweak on my tune.

[Mateusz]

^^^ Yeah same here for Adelaide!