AVCS VVT angle out of sync diagnosis MY07 GT B

[bass_straitener]

Pretty disappointing result from your trip to STI.

I thought the Davinci Code of AVCS was about to be cracked.

Ah well.... Back to logging and stuffing around.

Wonder what Owen will bring to the table as I've heard he's been diagnosed with a similar issue during the retune at Insight on the weekend.

[bigBADbenny]

Back to saving up for an early timing belt service lol. And the rest...

[KiDo_Tuning]

Back to saving up for an early timing belt service lol. And the rest...

Logged paggaz's car on the weekend, who has same ECU and similar mods with no issue and his fuel economy is also significantly better single digit values as well.

The fix might pay for itself!

[<GB>]

Could the tuning of the avcs be causing issues? Too aggressive angles?

[bigBADbenny]

The jury is out on that till members replace their gears and tear down the old ones.
I'll be using whatever tune I can get that has stockish avcs.
Docklands rough quote for timing belt service & gears was similar to Cromwoods

[<GB>]

Even en u pull them apart u may not know why they failed unless they are full of gunk

[KiDo_Tuning]

Could the tuning of the avcs be causing issues? Too aggressive angles?

Retuning a few US cars that have some wild AVCS, some even run 40 degrees at 2.4 to 2.8g/rev at midrange on big turbo setups. Romes original 98 tune was on 40 in the midrange too. All have no issue with cam gears.

[<GB>]

Well it could be age of the car in km plus extra asked of the avcs maybe?

[owen]

I was running 40 degrees even in cruise mode. Basically what it means is that the cam gears were hammering too far down in the rev range where i had no oil pressure, which has now caused my issue of rattling cam gears.

[KiDo_Tuning]

I was running 40 degrees even in cruise mode. Basically what it means is that the cam gears were hammering too far down in the rev range where i had no oil pressure, which has now caused my issue of rattling cam gears.

Umm, that is what they run stock At low engine speed, you want the inlet valve shutting early as you do not need to suck down a full cylinder of air if you want to keep load low. Even BMW have that in their VANOS system

No problems with oil pressure at that engine speed

[<GB>]

Vanos is a bit different to our system

[owen]

I don't know what they run stock, and honestly i may have remembered the number incorrectly, as I don't care what timing i'm running - I pay the tuner to do that. It just came up in conversation while he explained why my car isn't making the full power it should be (due to the cam gears and/or tensioner and my dodgy grimmspeed 3 port which i'll be changing to a proper electronic boost controller).
The car is currently making 240kw safely, however the tuner has told me to get my boost controller and cam gears sorted to make 260+

[KiDo_Tuning]

How is VANOS so different... it adjusts camshaft timing on the inlet cam in relation to crankshaft. The 3.0L AVCS A Tables are almost identical to BMW VANOS tunes
http://en.wikipedia.org/wiki/VANOS

I don't know what they run stock, and honestly i may have remembered the number incorrectly, as I don't care what timing i'm running - I pay the tuner to do that. It just came up in conversation while he explained why my car isn't making the full power it should be (due to the cam gears and/or tensioner and my dodgy grimmspeed 3 port which i'll be changing to a proper electronic boost controller).
The car is currently making 240kw safely, however the tuner has told me to get my boost controller and cam gears sorted to make 260+

They run up to 52 degrees internally without issue, albeit there is no point going that high

[<GB>]

How is VANOS so different... it adjusts camshaft timing on the inlet cam in relation to crankshaft. The 3.0L AVCS A Tables are almost identical to BMW VANOS tunes
http://en.wikipedia.org/wiki/VANOS

I don't know what they run stock, and honestly i may have remembered the number incorrectly, as I don't care what timing i'm running - I pay the tuner to do that. It just came up in conversation while he explained why my car isn't making the full power it should be (due to the cam gears and/or tensioner and my dodgy grimmspeed 3 port which i'll be changing to a proper electronic boost controller).
The car is currently making 240kw safely, however the tuner has told me to get my boost controller and cam gears sorted to make 260+

They run up to 52 degrees internally without issue, albeit there is no point going that high
[img]http://www.grayforge.com/axis/avcs_]

the early cars had oil pressure system the later cars use electic motor worm gear that moves a ramp on the inlet cam

[jaydece]

Intriguing, the verdict after diagnostics from Docklands is that the system is working, everything is doing what its being told to!

Meaning I'm going to be:
trying the stock tune once again,
plugging in a spare MY07 ECU (might mean recoding the keys if anyone know how to)
inspecting and cleaning the cam gear sensors,
getting a new tune,
and or ordering new cam gears.

Having lessons learnt with my AVCS issue and with your high km's BBB I would invest in getting new L and R solenoids anyway...

As you know my problem still existed even after I had new cam gears put in ( it did help but still not 100% ) cam sensors replaced and in the end new solenoids did the trick ( even though preliminary checks/test found they were fine )

Not saying you have the same problem? but just keep an open mind and don't chase it down to just the cam gears....This advice goes out to others having AVCS issues? Bruce, Owen and others out there