17286-lank-umer-ce-kod-89-pomogite-chto-eto

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I did a search and couldn t find anything that details how AVCS works.

I know how vtec works, and I know AVCS doesn t work the same way. AVCS is more like a ECU controlled adjustable cam gear on the intake side that can advance it up to 25 degrees?

So what is the logic in the ECU? When does it advance it? What sensors does it look at? Is it a static map that tells it to advance X degrees if Y % of throttle + at Z engine speed? Or is it a little more intelligent?

ANSWER:
The ECU controls the intake cam advance by regulating oil pressure to the cam gear/diaphram. The more pressure the more advance. The oil is sourced from the turbo oil inlet banjo for the right side cam gear and the top of the left cyl head for the left side Cam gear. Between these oil lines and the Cam gears sits a solenoid/valve. This valve is modulated with 12volts at various duty cycles to regulate pressure to the diaphrams. Pressure is never known by the system. Only the position of the intake cams via the extra intake cam sensors.

Under 70C water temp, the system is not active. The second 70C is reached the solenoids are clicked forward and oil pressure arrives at the diaphrams. The cams move and the movement is read by the cam sensors. An alignment procedure occures at that point. Duty cycle can be different from left to right but many times its the same….

If AVCS is simply unhooked your intake cams will be around 0 degrees. At WOT some slipage will occur. I have data logged up to 5 degrees advance at hard WOT runs. Left and right will be a bit different.

With AVCS hooked up the scheme is like this:

Idle — 9.8% duty to lock the cams at 0 advance.
Low load rev to 4500 rpm — 0 degrees but 49% duty to lock the cams.
Low load above 4500 rpm 9.4 degrees advance is called for and 53.9% duty is placed on the solenoids.
Cruise is mainly 0 degrees with 43% duty.
Slightly higher load from 2k to 5500 rpm 25-10 degrees of advance is called for. More down low and less up high int he power band. By 5500 rpm advance should be back to zero.

STI V7 cars run more advance then the Type RA Spec C car. AG970 code ECU s (type RA) run around 15 degress max while V7 and V8 STI cars run up to 25.

The main purpose of AVCS is for low end and high end power as well as mileage and emissions. The top end power increase is because AVCS helps bottom end and midrange so a more agressive Cam can be run. Type RA s come with 258 duration cams. In comparison to the WRX s 218. This is a huge, huge difference in cams.. Without AVCS you would have a lack of low end and a very peaky power band with those cams… Just as my Type RA does now with the AVCS not working still…. __________________
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