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The mkiv Supra Owners Club

AVCR Boost Controller


neilp9876

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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?

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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.

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Guest Jason1

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.

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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?

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Guest Jason1

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.

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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

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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.

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Guest Jason1
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.

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Guest Jason1
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.

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