can't boost past .8 bar...AVCR rev 2

[djpkins]

I have only had my rev2 tbo on the road for a month so I've been getting to grips with it steadily but I can't seem to get past .8 bar boost. I have set target boost for 1 bar and increased the duty to 40% from 30% with a seemingly small boost gain from .77/.78 up to .8 at 6250 ish revs...I'm findidng the manual hard to understand and I'm not sure if I'm still in learning mode or not. Do I manually increase the duty untill I hit my boost target? Any pointers would be greatly appreciated.

Arc intercooler,Mines ecu,standard cat, Departure 2 exhaust, grade 7 plugs, standard HG.

[afennell]

sounds like its running standard boost, have you checked all the vacuum hoses. Is the avcr displaying the boost?

[djpkins]

yep..it's showing target boost at 1 bar, I've gone through it and double checked the way I set it up...checked the sensors are reading ok and it's set to monitor injector pulse not rpm...I have it on 2 channel monitoring with peak hold on rpm and boost. I am going to renew and re-plumb the pressure sensor hose today as it's currently in-line with boost guage and map sensor and I understand it should be straight from the manifold really...

[RobCrezz]

Have you unplugged the VSV?

[djpkins]

The vsv is not unplugged but it is un -plumbed , I wasn't sure about taking it out of the loop altogether and funnily enough I was just going to put up a post about that very subject I have reached my target boost now by turning the duty up but if it's cool then i shall un plug the vsv aswell...
what is your opinion of moveing the ne points so they start from 2500 instead of 3k?

[allan]

i've got the same problem on my ride..
Did you solved it ?

[djpkins]

yes m8...I turned the duty cycle up to 70% and 1 bar was achieved instantly...never over boosts, spot on

[allan]

weird..... it doesn't work like that on my ride....
I tried the self learning mode too..but i still have the same problem..
my boost can't pass over 0.67 bar (even with the duty à 90%)

anybody can help me ?

[djpkins]

sounds like it could just be working off actuator pressure only...have you def got the boost control solenoid plumbed in the right way round...you need to eliminate the possibility of faulty components.

have you disconnected the vsv? your actuator should have 1 blocked pipe and 1 pipe going to the boost control solenoid.

[sjm1984]

Have you unplugged the VSV?

Where is that located?

[allan]

sounds like it could just be working off actuator pressure only....

No, because if i turn off the AVc-R, the spring actuator pressure is 0.4 bar

have you def got the boost control solenoid plumbed in the right way round...you need to eliminate the possibility of faulty components..

-The solenoid is well connected with the right hoses.
-To be sure, i've replaced the solenoid by an another one, and the problem is still here...

have you disconnected the vsv? your actuator should have 1 blocked pipe and 1 pipe going to the boost control solenoid.

-I've unplumbed the VSV, and blocked each pipe firmly.

I think the problem come from the avc-r settings:
-Can i use the Avc-r without the self leaning function ?
-I've tried the self learning system, but it's very badly explain in the manual how to proceed...
-is anybody here know the EXACTS steps to engage the self learning mode and check the datas learned by the AVC-R ?

[djpkins]

I will have a good look at mine when I go out later but I assumed that when I manually dialed in the duty cycle, and I also changed the NE points to start at 2500 rpm, that I had over ridden the self learn mode..I think it stops learning when a stable boost pressure is achieved...the manual is a bit hard to grasp...be patient and we will sort this out

[djpkins]

my duty cycle has actually dropped to 67% so i assume it has self learned that, to hold 1 bar boost, that's what it needs to be.
could you have a weak spring in your BOV or a leak somewhere maybe??

[allan]

my duty cycle has actually dropped to 67% so i assume it has self learned that, to hold 1 bar boost, that's what it needs to be.
could you have a weak spring in your BOV or a leak somewhere maybe??

i've replaced my sotck BOV by a new one: same problem...

[BenF]

FWIW, the AVC-R 'learn' mode is .... rubbish.

If you're not seeing boost increases that you expect as you increase the duty cycle, I'd check the basics are OK - HT stuff ( Plugs, HT Leads, Dizzy cap and rotor arm ) and that there aren't any air leaks - "performance" BOVs are particularly problematic.

[David21]

Yeah it's best not to use the self learning mode as it will accomodate to hit the right boost each time.

I find turning off the self learning mode and tweaking it yourself doing a few runs down a quiet road is the best - preferably with a passenger

[djpkins]

can you tell him how to turn off self learning mode^^^^ I had a bit of help setting mine up and now it's stable I only really know how to tweak it

[David21]

IIRC you need to go to the gears menu and set them all to X. That should do the job. The AVC-R will only adjust when you change the settings then.

[allan]

IIRC you need to go to the gears menu and set them all to X. That should do the job. The AVC-R will only adjust when you change the settings then.

according to the f.... user manual the self learning mode is activated by the stard duty at 0%
The learn gear menu (X or O) is also part of the game ?

[David21]

So i think what you need to do is set all the gears with an X and set the start duty above 0% then it should know not to use the learn gear funtion......me thinks