neilp9876 Posted July 14, 2014 Share Posted July 14, 2014 My car has had an AVCR controller fitted since i bought it. When I went BPU I had it setup by a garage to run at 1.2 bar which it did. Then after a while it reverted to just boosting to 1.0 bar, I didnt think about it or care so I don't know when it happened, but now I want a bit more power again. The only thing I can think of that changed was I replaced a aftermarket BOV for the OEM one. Other than that nothings changed that I can remember. Reset and played with the controller, its fine, just will not go above 1.0. Would the BOV affect it, could a pipe have come off or split? Any ideas where I should look? Quote Link to comment Share on other sites More sharing options...
neilp9876 Posted July 14, 2014 Author Share Posted July 14, 2014 Also reading other threads, it appears that the controller should only be able to increase the boost? I can set mine to 0.85 and will stay at exactly that, set it 0.95 and its also spot on, set above 1.0 though and it sticks at exactly 1.0. Quote Link to comment Share on other sites More sharing options...
Nic Posted July 14, 2014 Share Posted July 14, 2014 Yes a boost controller can only increase boost. The blow off valve would only effect the boost pressure if it was leaking. You could try these settings http://www.mkivsupra.net/vbb/showthread.php?296140-boost-controller-help-please&p=3728833&viewfull=1#post3728833 Quote Link to comment Share on other sites More sharing options...
neilp9876 Posted July 14, 2014 Author Share Posted July 14, 2014 I've tried all the settings I can find in other threads, it's stubbornly stuck at exactly 1.0. There must be a pipe issue somewhere but I've no idea where to look. Quote Link to comment Share on other sites More sharing options...
mellonman Posted July 15, 2014 Share Posted July 15, 2014 you are adjusting they duty right? Quote Link to comment Share on other sites More sharing options...
neilp9876 Posted July 15, 2014 Author Share Posted July 15, 2014 you are adjusting they duty right? Yep, can turn it right up to 80% (the maximum iirc) and it doesnt make a difference, tried the feedback settings and everything else that Ive found about the controller. I dont really understand how they work, seems counter intuitive that I can lower the boost but not raise it. Quote Link to comment Share on other sites More sharing options...
Guest Jason1 Posted July 15, 2014 Share Posted July 15, 2014 How are you adjusting it? I fitted one to my car around a month ago and set it up myself. Boost holds rock steady and it is in self learn and so adjusts for best boost curve, Have you downloaded the manual? Once you get a understanding on how it works it is a really good unit. Quote Link to comment Share on other sites More sharing options...
neilp9876 Posted July 16, 2014 Author Share Posted July 16, 2014 I reset the controller and set the following : A = 0.85 / 60% boost / duty B = 1.40 / 90% boost / duty Feedback set to all 5's and the learn mode to O. The "etc" are correct as per other posts and everything else was default. Setting A is spot on, setting B stops at 1.0, setting OFF lets its boost to 0.68. All the pipes look fine and the plumbing is correct because it did work once. Could there be a restriction somewhere else? I know the BOV was changed, I also put a Tanabe Touring exhaust on it a while ago, maybe that restricts the flow? Quote Link to comment Share on other sites More sharing options...
mellonman Posted July 16, 2014 Share Posted July 16, 2014 your bov must be leaking dude or you have a leak somwhere anyway , with those settings on A you should be seeing about 1.5 bar i would say at 60% duty (well i was around 50% for 1.4) this may help http://mkiv.com/techarticles/avc-r/install/index.html Quote Link to comment Share on other sites More sharing options...
neilp9876 Posted July 16, 2014 Author Share Posted July 16, 2014 Is there a way of temporarily disabling the BOV to see if its releasing the pressure? Quote Link to comment Share on other sites More sharing options...
mellonman Posted July 16, 2014 Share Posted July 16, 2014 you would need to cap both parts that go to the stock bov you have , it my well be worth checking your intercooler and piping as well as all jubilee clips , Quote Link to comment Share on other sites More sharing options...
Guest Jason1 Posted July 16, 2014 Share Posted July 16, 2014 Mine is at 40% duty and at 1 bar Have you done the gear judge? Also feedback I run mine at 3,2,2,2 and x for fifth as I have a auto Also in Gear learn I have turned of 5th Once you get the duty close to your target boost the unit goes into self learn as mine has. Quote Link to comment Share on other sites More sharing options...
mellonman Posted July 16, 2014 Share Posted July 16, 2014 Alot is dependant on your exhaust but at even you at 40% should see more the 1 bar with my restrictor ring I was at 40% and still making around 1.2 Also what I have found the if you up the feedback speed you reduce turbonlad and spool slightly faster if you dont believe me just try it Set youur feed back 6654 you will be suprised Quote Link to comment Share on other sites More sharing options...
neilp9876 Posted July 17, 2014 Author Share Posted July 17, 2014 Mine is at 40% duty and at 1 bar Have you done the gear judge? Also feedback I run mine at 3,2,2,2 and x for fifth as I have a auto Also in Gear learn I have turned of 5th Once you get the duty close to your target boost the unit goes into self learn as mine has. I havent done the gear judge but to be honest I really dont think its the controller. Alot is dependant on your exhaust but at even you at 40% should see more the 1 bar with my restrictor ring I was at 40% and still making around 1.2 Also what I have found the if you up the feedback speed you reduce turbonlad and spool slightly faster if you dont believe me just try it Set youur feed back 6654 you will be suprised Something is definitely releasing the pressure or restricting it, the confusing part is the fact it to limits itself to exactly 1.0bar that made me think it might be the controller. I also think a leak would release all the pressure in one go or make it unstable, so I'm going to target the BOV first then look at other things from there. I'll feedback when i find something. Quote Link to comment Share on other sites More sharing options...
Guest Jason1 Posted July 17, 2014 Share Posted July 17, 2014 Alot is dependant on your exhaust but at even you at 40% should see more the 1 bar with my restrictor ring I was at 40% and still making around 1.2 Also what I have found the if you up the feedback speed you reduce turbonlad and spool slightly faster if you dont believe me just try it Set youur feed back 6654 you will be suprised When unit is off my standard boost is at 0.8bar I have full exhaust system 3" with a 2.5" front pipe. Has a restrictor ring not sure which one. I shall try the feedback as you suggest worth a go and see what happens. Quote Link to comment Share on other sites More sharing options...
Guest Jason1 Posted July 17, 2014 Share Posted July 17, 2014 I havent done the gear judge but to be honest I really dont think its the controller. Something is definitely releasing the pressure or restricting it, the confusing part is the fact it to limits itself to exactly 1.0bar that made me think it might be the controller. I also think a leak would release all the pressure in one go or make it unstable, so I'm going to target the BOV first then look at other things from there. I'll feedback when i find something. Sorry mate, Have you tried it in TTC mode? This would confirm something wrong in the air system or a vsv problem if it works then. Quote Link to comment Share on other sites More sharing options...
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